Manual OPTIMUS MT c15 Eng

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OPERATING MANUAL

Issue: 1

Revision: 0

Form code: F-02-13ROMANIA

S.C. KOBER S.R.L.

Date: 19.02.2004VADURI BRANCH

DENOMINATION OF THE UNIT/

EQUIPMENT/INSTALLATION

MURAL THRMAL UNITPage : 1/40

Approved

Unique administrator

Eng. Aurel Kober

Denomination of the

unit/equipment/installation

MURAL THERMAL UNIT

Commercial denomination of the

unit/equipment/installation

OPTIMUS MT

Type of the unit/equipment/installation C15 SPV 24 MEFM

Date of execution of the prototype 16.02.2004

Manufacturer Identification data

Denomination: KOBER S.R.L. TURTURESTI, VADURI

BRANCH

Address: Vaduri-Alexandru cel Bun, jud. Neamt

Phone/Fax: 0233/241 946

Fiscal code: R 2005144

Bank account: 2511.31-56.44/ROL B.C.R. PIATRA NEAMT

e-mail: [email protected]

The undersigned:Factory Executive Manager – Eng. Theodor Farcas

Commercial Executive Manager – Eng. Mariana Kober

Director Design Management – Eng. Radu Anghel

Head of the Quality Control Office – Eng. Petru Erhan

Standardization Manager – Eng. Ionut Balan

State on our responsibility that the date of this operating manual are in compliance with the

legal documents in force, the instruction in force within the company and the data registered

in the records, measuring sheets and analysis steps.

The operating manual must be kept in such a manner that it should be available at anymoment.

This operating manual is the property of KOBER S.R.L. TURTURESTI, VADURI

BRANCH.

It is forbidden the copying or reproduction of any part of this operating manual without the

written approval given by KOBER S.R.L. TURTURESTI, VADURI BRANCH.

http://www.motan.ro/











CONTENTS

1. Safety measures……………………………………………………………4

2. Constructive and dimensional characteristics……………………………..6

3. Marking, packaging and transportation instructions………………………7

4. Mounting and installing instructions………………………………………84.1. Location of the unit……………………………………………………8

4.2. Mounting on the wall………………………………………………….8

4.3. Connection of the combustion gases exhausting system……………...8

4.4. Connection to the fuel feeding system………………………………...9

4.5. Connection to the heating and domestic water system……………….10

5. Operating instructions

5.1. General description

5.2. Control panel

5.2.1. LCD display panel in the user’s module

5.2.2. LCD display panel in the plumber’s module

5.2.3. LCD display panel in the module “setting of the modulation parameters of the fan”

5.2.4. Range of the settable values with the LCD display panel

5.2.5. Operation of the electronic plate

5.2.6. Module of domestic hot water in the case of bithermal units (symbol 7 on)

5.2.7. Heating module (symbol 8 on)

5.2.8. Antifreeze function (symbol 4 on)

5.2.9. “Chimney-sweep” function (symbol 5 - intermittent)

5.2.10. Self checking of the system and protection functions

5.3. Pre-setting of the general technical data

5.4. Shutdown of the unit in safety conditions

5.5. Error signals

5.6. Visualizing of the pressure

5.7. Absence of water in the thermal heating circuit

5.8. Safety and over-temperature thermostat

5.9. Sensing the absence of draft

5.10. Additional information regarding the functioning of the unit

5.11. Additional facilities

5.12. Other functions regarding safe operation

6. Instruction for putting into operation, service and maintenance

6.1. Putting into operation

6.2. Maintenance6.3. Service

6.4. Troubleshooting table

7. Main components and equipments

7.1. Front cover

7.2. Burning chamber

7.3. Gas valve

7.4. Burner

7.5. Heat exchanger (combustion gases/water)

7.6. Safety valve

7.7. Circulation pump

7.8. Expansion vessel7.9. Flow-meter



7.10. Fan

7.11. Air pressostat

7.12. Exhaustion kit

7.13. Hydro-block assembly

7.14. Control plate

8. Used standards. Agreements/certifications9. Work-safety and fire-fighting norms

10. Drawings and sketches

10.1. Hydraulic diagram for mural thermal units CV15 SPV24 MEFB

10.2. Diagram for executing the connections for mural thermal units with forced

draft C15 SPV24 MEFB

10.3. Mounting on the wall with the observance of the slope for the mural thermal

unit with forced draft C15 SPV24 MEFB

10.4. Types of mounting configurations for the thermal unit with forced draft C15

SPV24 MEFB

10.5. Locating the connections for mural thermal units with forced draft C15 SPV24

MEFB



CHAPTER 1

Safety measures

For preventing the risks to which the user may be exposed, the manufacturer imposes a series

of safety measures described below.

The mounting-installing, putting into operation, service-repairing operations and periodicaltechnical checking are done only by ISCIR authorized personnel, according to the norms in

force (fire-fighting and work-safety norms), as well as the normatives in force issued by

A.N.R.G.N. and C.O.N.E.L. All the indications of this manual must be observed; any

infringement can cause damages and the manufacturer is not liable for such damages.

In the case of a faulty functioning of the apparatus shut it down immediately and contact the

company that is ensuring the service of those products or directly the manufacturer at the

phone nos. 0233/241 746; 241 946.

For guaranteeing the efficiency of the unit and its proper operation it is recommended a yearly

checking by specialized personnel, with the observance of the manufacturer’s conditions.

This unit is designated for the use for which it was specially designed.

Any other mode of use will be considered improper.Any contracting or extra-contracting warranty of the manufacturer is excluded for damages

caused by installing or operating errors and non-observance of its instructions.

The manufacturing company assumes no responsibility for the clogging of the domestic hot

water preparing coil, owed to exceeding the water hardness (over 50 mg. eq. CaO/l) and/or

absence of cold water pressure (min. 0.5 bar). It is recommended to install at least one

softening filter and one impurities removing filter on the outlet pipeline of the heating water.

General measures

Installing must be made only by ISCIR authorized personnel according to the norms and

legislation in force.

Locating room

According to the normatives in force (I6/98)

Interventions on the unit

Installing, first start-up, maintenance and repair must be performed by speciality-authorized

personnel. During interventions the unit must be disconnected from the power source.

Interventions on the gas installation

Must be performed only by personnel authorized by ROMGAZ.

Remedying works

Are not allowed for components having safety functions.

First start-upWill be done only by authorized personnel.

User’s training

The installer must hand over to the user of the unit the operating instructions and must initiate

him as regards its operation.



CHAPTER 2

Constructive and dimensional characteristics

Denomination OPTIMUS MT

Type C15 MT SPV 24 MEFM

No. of type homologation certificate CSDraft Forced

Burning chamber Sealed

Minimum guaranteed yield 93%

Nominal power 10,1 – 23,7 kW

Nominal load of the burner 10,9 – 25,48 kW

Pressure of the gas

Natural gas at the connection (after the reducing device) 20 mBar

Natural gas at the inlet- maximum permitted pressure) 35 mBar

LPG 30-37 mBar

Supply voltage 230 VAC, 50HzAbsorbed electrical power 150 W

Weight 30 kg

Capacity of the heat exchanger 1 L

Fuel consumption – natural gas (8500Kcal/Nm3) at

maximum power

2,64 Nm3/h

Fuel consumption – LPG (20425Kcal/Kg) at maximum

power

10,07 kg/h

Thermal heating

Admitted maximum and minimum pressure 0,5 and 3 Bar

Temperature on the heating circuit 40-800C

Connections: inlet-outlet heatinginlet-outlet hot domestic water

gas feeding

¾”½”

¾”

Dimensions: Depth (mm)

Width (mm)

Height (mm)

With the elbow installed (mm)

275

415

700

825

Expansion vessel with membrane 7 L

Domestic hot water (DHW) preparing unit

Range of temperature- DHW 30-600C

Values of the flow rate∆

t=25

0

C∆t=350C

∆t=450C

13,5 L/min9,7 L/min

7,5 L/min

Pressure of the domestic cold water 0,2-8 Bar

Temperature of the combustion gases Nominal 1500C

Combustion gases connections (inlet-outlet) diam 100/diam 60

Length of the combustion gases connection Maximum 3 m

Informative values

Maximum content of water in the unit

Maximum surface of the enclosure

150 L

200 m2



CHAPTER 3

Marking, packaging and transportation instructions

Marking

The marking is made by inscribing the initials “CS” with the font, dimension and the

conditions foreseen by the law.On each unit it is fixed by sticking a tag inscribed visibly with the followings:

• Denomination or sigle of the manufacturer

• Commercial denomination of the apparatus

• Series no. and the batch

• CS and the number of the notified certification body

• Type of used electrical power supply

• Sign of the technical quality control body

• Category of the apparatus

• Type of gas for which the unit was adjusted and the nominal inlet pressure

Documents

Each unit is delivered together with the:

Technical manual, quality and guarantee certificate, statement of conformity, CS type

certificate (copy) issued by ISCIR CERT, start-up and intervention sheet, list of

auxiliary parts.

Packaging

The units will be fixed in cardboard boxes, protected with cardboard corner pieces and

protection elements, both at the lower and the upper part of the box.

The unit is delivered with all its components installed, except the exhaustion kit, which is

delivered together with the unit, packaged in a cardboard box. It consists of a 900

exhaustionelbow and the coaxial inlet/outlet tubes, placed on distance supporting pieces, together with

the afferent gaskets.

Storing

The storing of the units will be done in dry rooms, protected from bad weather and chemical

agents.

Transportation

During transportation there must be taken all the necessary measures for avoiding shocks or

damaging of the units.



CHAPTER 4

Mounting and installing instructions

This chapter is addressed both to the authorized persons who are involved in installing the

boiler and to the beneficiary who is interested that the performed works correspond to the

safety operating norms of all installations contributing to a proper functioning of the boiler.Installing of the boiler is not equivalent with it’s putting into operation. This must be done by

ISCIR authorized personnel according to the normatives in force and agreed by Kober S.R.L.

Turturesti, Vaduri Branch.

4.1. Location of the thermal unit

According to the normatives in force, respectively: Normatives for the design and

execution of natural gases feeding systems, Normatives for operating natural gases

feeding systems 16/98, chapter 8 and I 31 Normative for design and execution of feeding

systems using petroleum liquefied gases (PLG)

The unit can be installed in any room with a maximum humidity of 60% and a temperature

range of 20-300C.

4.2. Mounting on the wall

Is performed according to the following instructions:

The packaging is removed.

There are to be made two holes in the wall at a distance of 380 mm one from the other and at

the desirable height.

The two dowel-pins are fixed in the wall, followed by mounting the two hooks by screwing.

The set of dowel-pins and hooks are delivered together with the unit.

The unit is fixed into the two hooks, taking care to position them in the two cutting-ups on the

rear.

The rigidity of the fixing has to be checked.

4.3. Connection to the combustion gases exhausting system

- On the combustion gases exhausting line. Connection to the chimney stack (natural draft).

The diameter of the combustion gases exhausting line is 125 mm.

The connection for combustion gases exhaustion is linked, by sheet-iron tubing, on the

shortest way to the stack (exhaustion column). Sharp bending must be avoided.

If it is necessary the exhaustion tubing of the combustion gases is thermally insulated.

- On the combustion gases exhausting line, without connection to the chimney stack (forced

draft).

The exhaustion of the combustion gases is made through a tube with a diameter of 60 mm,coaxial with the air intake tube having a diameter of 100 mm. The exhaustion tube is placed

inside the air intake tube.

The intake-exhaustion kit is delivered together with the unit. It consists of an elbow, the

intake-exhaustion tube and the afferent seals.

The connection is made as following:

- All the gaskets are mounted in their own positions

- The elbow is fixed at the upper side of the carcass with 4 screws, taking care to

position the afferent gasket between the cover and the elbow. It is possible to locate

the elbow in steps of 45 degrees in a horizontal layout.

- The tube is then fixed by connecting to the elbow.

It is compulsory to install the kit with a slope of 0,5-2% for evacuating outside thecondensate.



Electric power supply

The boiler must be connected to a 220V – 50Hz monophasic network with safety null,

through 5 A fusible fuses. All external control and commutation components must correspond

to this voltage.

The external connections must comply with the normatives in force. The connection to the

electrical network of the building must allow the total electrical insulation of the boiler insituations in which it is necessary to intervene on it.

4.4. Connection to the fuel feeding system

The gas-feeding connection (connection C, see the layout of the connections in chapter 10)

will be executed according to the normative in force (I6-98).

- Minimum/maximum pressure when natural gas is used:

The pressure of the natural gas at the inlet in the gas valve must be maintained

between 20-25 mbar. Exceeding this pressure range can lead to decreasing of the combustion

efficiency.

- Minimum/maximum pressure when LPG is used:

The pressure of the gas, when LPG is used, at the inlet of the gas valve must bemaintained in the range of 35-45 mbar.

The gas connection element has ¾”.

The gas tap is sealed.

The tightness is checked with a water-soap emulsion.

The gas line is vented.

The maximum allowable pressure, to which the gas valve resists, is 60 mbar. If the

preset value of the pressure is not observed noise could occur, owing to turbulent

combustion, or problems could appear at the internal regulator of the gas valve, which

could lead to the worsening of the combustion efficiency.

The gas supplying pipes must not have a smaller diameter than the connection

corresponding to the boiler.

4.5. Connection to the heating and domestic water system

Recommendations:

It is recommended that the heating system should be designed by specialized and authorized

personnel, according to the normatives in force: I13 – Normative for the design and execution

of heating installations, personnel who also should execute these works, so that the

installation can be operated in optimum conditions.

During the design of the central heating system special attention must be given to the

dimensioning of the pipes and the pressure losses on them and on the heating elements.

Filling of the installation must be done preferably with treated water (softened water).Connections can be done by soldering or with compression fittings in the case of copper

pipes. It must be ensured the necessary slope of the pipes for venting and easy evacuation to

the points foreseen for this purpose in the installation.

The evacuation points must be placed in accessible places, which allow the drainage of water

from the heating circuit. It is recommended a minimum diameter of 1/2”.

It is recommended to introduce manual venting devices on each of the heating elements

(central heating radiators, registers, etc).

After connection of the pipes the two circuits will be filled gradually with water.

- On the primary circuit (heating)

The heating circuit must be cleaned very well, especially when the boiler operates on a

heating circuit used previously.



The boiler is connected to the heating installation (through connections A and E, see “Layout

of the connections” in chapter 10).

The admitted working over-pressure is 3 bar.

The testing over-pressure is 4,5 bar.

On the heating circuit is compulsory to install on the outlet of the installation an impurities

retaining filter - On the secondary circuit (domestic hot water)

The boiler is connected to the domestic hot water installation (through connections B and D,

see the layout of the connections in chapter 10).

The admitted working over-pressure is 8 bar.

It is compulsory to install softening filters on the cold water inlet connection

Operating with an empty or partially filled boiler can lead to explosions.

The cold water feeding pipe of the domestic hot water preparing circuit will remain

permanently open (the closing of the network will be done only through the taps near the

consumption points) for permitting the taking over of the dilatations on this circuit.

VentingBecause water contains a certain amount of dissolved gases, venting will be made at the first

filling and during the subsequent completion with water of the heating system.

During the heating of the system the gases will be collected in the highest points of the of the

system and must be eliminated. Installing of some venting devices (manual or automated) in

these points of the system will allow the elimination of the gases, both at the first filling and

during operation.



CHAPTER 5

Operating instructions

5.1. General description

The mural thermal unit represents a gaseous fuel consuming apparatus, which has the role to

transform the energy of the gaseous fuel into thermal energy by burning. This apparatus isfunctioning without the need of permanent surveillance because of the protection and control

systems the unit is endowed with.

The unit consists of several components that are functionally described below.

The gas enters the unit through the gas feeding circuit consisting of a connection and a

pressure reducing device which will adjust the pressure to 20 mbar for G20 – subgroups A(L)

and A(H). For LPG (subgroups of propane and propane-butane mixtures) the reducing device

will be regulated to 37 mbar. So the gas is reaching at the gas valve that has also the role to

modulate the gas flow rate at the outlet towards the burner.

Ignition is made by initiating the flame by means of an ionization sensor.

The unit is foreseen with a fan having the role to evacuate the combustion gases. During the

initiating phase the fan has the role to evacuate a volume of air for ensuring a non-explosiveignition. Explosive ignition can occur because of some gas accumulations during the

shutdown periods.

The burning chamber, having a parallelepipedic shape and being manufactured of sheet iron,

lined inside with ceramic fibers, is designed in such a manner that it allows the heat transfer to

the heat exchanger with minimum heat losses.

In the case of the heating circuit, the heat resulted by combustion of the gaseous fuel is taken

over by the monothermal heat exchanger and transferred to the thermal agent (water), which

is transported through the heating installation by the circulation pump. In the case of the

domestic hot water the heat transfer is made to this circuit by the plate heat exchanger.

The combustion gases are evacuated by the fan.

The protection and the control of functioning are made electronically. The programming of

the unit is made on the control panel (see paragraph 3.1).

The regulating, protection and automation apparatus ensure:

- ignition of the flame

- sensing the presence of the flame

- signalling the temperature and pressure of the water in the unit

- adjustment of the heating circuit temperature

- adjustment of the temperature on the domestic hot water circuit

- safe operation of the boiler in the case of over-temperature and over-pressure

- presence of draft (air pressosat)

-

safety of the boiler at the minimum level of water (pressure sensor)- sensing the need of domestic hot water (flow-meter) and granting prevalence to this

type of consumption.



5.2. Control panel

On the control panel are installed the indicating apparatus and the operating buttons.

The chrono-thermostate and the environmental thermostat can be installed upon request.

Fig. 1 – Control panel

5.2.1. LCD display panel in the user’s module

Button Operating functionSW8 On/off: this button is shutting down/opens the unit (the unit is still connected to

the power network). In off mode the panel is entirely deactivated, except symbol 1. At the

moment of activation, the activated symbols appear on the LCD display and symbol 1

disappears.

SW7 Summer/winter: by pushing this button you can select the winter or summer

mode. Activated symbols are 2 for summer (in this module any temperature value is displayed

in stand-by and if there is demand for domestic hot water appears the setting temperature of

the domestic hot water) and 3 for winter mode.

SW2 Reset if the unit is blocked: reset if the boiler is in Err E2.

SW4 Comfort: by pushing this button you select the comfort mode (symbol 6 on)

and the set range of the domestic circuit can decrease. Push again for canceling (symbol 6off).

SW3 (-) heating: by pushing the button once, the preset heating temperature is

displayed; if you continue to push the setting decreases. During visualization of the heating

set point, symbol 8 is blinking. If the external sensing device is activated, the temperature of

the primary circuit will not be changed directly, but two different parameters will decrease:

the desired temperature in the room, and after 5 seconds the symbol “--“ appears on the

display and is maintained 1 second, then the dispersion coefficient of the building is displayed

and can be changed.

SW6 (+) heating: by pushing the button once, the preset heating temperature will be

displayed; if you continue to push the setting increases. During visualization of the heating set

point symbol 8 is blinking. The heat, the temperature in the room and the dispersioncoefficient can be increased in the same way as by SW3.



SW1 (-) DHW: by pushing the button once the preset temperature of the domestic

hot water will be displayed; if you continue to push the setting decreases. During visualization

of the set heating point symbol 7 blinks.

SW5 (+) DHW: by pushing the button once, the preset temperature of the domestic

hot water will be displayed; if you continue to push the setting will increase. During

visualization of the set heating point symbol 7 blinks.SW7+SW8 Function “chimney-sweep”. By pushing simultaneously SW7 and SW8, with

the unit in the off position, you activate the “chimney-sweep” function, the emitted heat

appears on the display and symbol 5 begins to blink. After the normal heating starting cycle is

initiated at maximum capacity, this situation is maintained until the temperature of the

primary circuit reaches a safety limit, after that the heat is deactivated and will be activated

again when the temperature decreases under the given limit. Any demand for domestic hot

water will activate this function, but this can also be done manually by pushing the button

SW7. in this case symbol 5 will disappear.

5.2.2. The LCD display panel in the installer’s module

For activating the installer’s module push simultaneously the SW4+SW3 and SW6 with thecontrol plate activated and ensure yourself that the symbol 10 blinks on the display. On this

module the buttons have the following functions:

Button Operating functions

SW8 On/off: see the user’s module

SW7 Summer/winter: see the user’s module

SW2 Reset: see the user’s module

SW3 (-) Heating capacity: by pushing the button once the preset percent of the

maximum capacity will be displayed in the heating module; if you continue to push the

percentage decreases. During selection the message MP (Maximum Power) will be displayed

on the LCD.

SW6 (+) Heating capacity: by pushing the button once the preset percent of the

maximum capacity will be displayed in the heating module; if you continue to push the

percentage increases.

SW1 (-) Soft-start: by pushing the button once the preset percentage of the ignition

power of the boiler will be displayed; if you continue to push the percentage decreases.

During selection the message IP (Ignition Power) will be displayed on the LCD display.

SW5 (+) Soft-start: by pushing the button once the preset percentage of the ignition

power of the boiler will be displayed; if you continue to push the percentage increases.

Push the SW3 button for leaving the installer’s mode and symbol 10 will be erased.

5.2.3. LCD display panel in the module “setting the modulation parameters of the fan”

For activating this module push simultaneously the buttons SW5+SW1 and SW8, with the

control plate in On position and ensure yourself that the “Fan” symbol appears on the display.

In this module the buttons have the following functions:

SW8 On/off: see the user’s module.

SW7 Summer/winter: see the user’s module.

SW2 Reset: see the user’s module.

SW3 (-) Maximum speed of the fan: by pushing this button once the preset

percentage of the maximum speed of the fan will be displayed; if you continue to push, the

percentage decreases. During selection the message F1 (max. speed of the fan) appears on theLCD display.



SW6 (+) Maximum speed of the fan: by pushing this button once the preset

percentage of the maximum speed of the fan will be displayed; if you continue to push, the


SW1 (-) Minimum speed of the fan: by pushing the button once, the preset

percentage of the minimum speed of the fan will be displayed; if you continue to push the

percentage decreases. During selection the message F2 (minimum speed of the fan) will bedisplayed on the LCD display.

SW5 (+) Minimum speed of the fan: by pushing the button once, the preset

percentage of the minimum speed of the fan will be displayed; if you continue to push the


By pushing the SW4 you can leave this module and the symbol “Fan” will be erased.

5.2.4. The range of values settable with the LCD display panel

- heating system 30-800C

- heating system through the floor 15-400C

- domestic hot water 30-600C

- comfort – domestic hot water 35-450C- external sensor

temperature in the room 10-300C

dispersion coefficient 5-350C

- ignition power (soft start) 0-99% of the modulation current

- max. speed of the fan 0-99% of the modulation current

5.2.5. The operation of the electronic plate

The IMP start cycle

When the feeding of the electronic plate is started, there must elapse 25 seconds before any

unsuccessful heating demand or attempt is processed on the plate. This allows a positive

completion of the initialization. At this moment the 4 “—“ segments are displayed and the

symbol 11 blinks.

The operating cycle starts when a heating demand exists through the room thermostat (heating

module) or flow meter (domestic hot water module). The water pump is activated (only for

heating and the domestic circuit in monothermal boilers) and if the temperature of the water is

lower than the temperature previously regulated, the command for actuating the burner will be

initiated.

In the case of boilers with closed chamber, the control unit activates the fan only if the air pressostat is in the “no-air-flow” position, which then shifts to the “air-flow” position, the TW



pre-cleaning time starts and after its elapsing the gas valve is put into operation, the ignition

device is activated and the TS safety period begins.

At this moment the heat capacity of the burner is maintained at a low value (soft start). If a

flame signal (symbol 9) is detected at the end of the TS safety period, the temperature control

process will be started and the flame of the burner will be modulated (symbol 12 increases

and decreases according to the modulation of the gas valve) for reaching the same water temperature as the one previously regulated. If the flame signal is not detected during the

safety period, the gas valve will close after elapsing this period of time and another ignition

attempt will be initiated, starting from the TW pre-cleaning time. The control unit performs 3

ignition attempts and if the flame is not detected blocking occurs. This is signaled by the

symbol 9 on the control panel; for resetting the system push the corresponding button. If there

still exists a hot water demand, the boiler will start a new ignition cycle; if the factors

determining the blocking appear again, the unit returns to the same state. The unit continues

to function until the heat demand stops or one of the safety devices is activated or the flame

extinguishes.

5.2.6. Domestic hot water module in the case of bithermal units (symbol 7 on)The ignition demand in the domestic hot water module has prevalence toward the heating

module. The ignition of the burner is produced when a domestic hot water demand occurs.

The unit tries to supply the hot water to the user at a preset temperature. The demand is

detected through the flow meter. In this case the pump is not functioning. If the temperature

of the hot water is higher than the preset value, the unit stops. Immediately after the heat

dissipates, the unit is activated again.

5.2.7. Heating module (symbol 8 on)

If the unit is on winter program and if the room thermostat is deactivated, the temperature of

the flowing water is lower than the one set previously, the unit will initiate the ignition at soft-

start power, the modulation of the flame starts and continues until the unit reaches the

functioning state. If the temperature of the water is higher than the limit set previously by the

user, the unit stops and the pump is active; reignition occurs when the temperature of the

water decreases under the set value, provided that a period of time has elapsed from the shut-

down of the unit, namely the time “of preventing the appearance of frequent cycles”. The

maximum capacity of the unit in the heating module is set during heating with the buttons

located on the control panel.

Over-functioning of the circulation pump

Each time when the unit shuts down (in the heating module), the pump is still working for a

short period of time for preventing over-heating of the water in the primary heat exchanger.The role of the pump is to prevent blocking

If the unit did not perform any ignition cycle in a given period of time, the pump starts to

operate a few seconds for avoiding blocking owed to non-operation.

5.2.8. Antifreeze function (symbol 4 on)

When the sensor of the system measures a temperature lower than the set temperature for the

antifreeze function, the burner is activated in the heating mode and the pump starts to operate.

This state persists until the canceling temperature of the antifreeze function is reached.



5.2.9. “Chimney-sweep” function (symbol 5 blinks)

This function is specially designed for canceling the normal control of the unit, allowing the

unit to function at the maximum hating capacity. The function is useful during installing and

when measures are taken to check the combustion products, as the standards in force may

request. The function can be deactivated manually on the control panel or by any demand for domestic hot water.

5.2.10. Auto-checking of the system and protection functions

The system is foreseen with several diagnose functions that are signaling on the display of the

control panel the operating state of the unit and the type of faults that might occur:

- Temperature of running water

the heating temperature in 0C (from 00C to 990C) or the DHW system is displayed (if

available).

- Blocking and the corresponding temperature (anomaly)

in the case of failure in detecting the flame after the three ignition cycles, the mother plate

will block and the blinking symbol Err E2 appears on the display of the control panel.- Parasite flame (anomaly)

if a parasite flame is present, the blinking symbol Err E2 appears

- Insufficient water pressure in the primary hydraulic circuit (anomaly)

in cases in which the pressure sensor measures an insufficient water pressure in the system

(<= 0,5 bar), the burner and the pump are deactivated and on the display appears the blinking

luminescent symbol Err E1.

- Failure of temperature sensor (anomaly)

1. Heating water sensor: any malfunction of the sensor, owed for example to a wrong

connection or short-circuit leads to an immediate deactivation of the burner and of the pump

and to the appearance of the blinking luminescent symbol Err E3.

2. Sensor for domestic hot water: any malfunction of the sensor, owed for example to a wrong

connection, does not lead to an immediate deactivation of the burner, but to the display of the

blinking luminescent symbol Err E4 (only in the case of monothermal units)

- Absence of draft during start-up (anomaly)

if the pressostat does not commute in the TW pre-cleaning period of time, the unit does not

start to function and after 10 seconds appears on the display the blinking symbol Err E5. This

anomaly disappears when the flame is detected at the end of the operating cycle.

- The elimination of the combustion products causes the activation of the protection devices

(animaly): OPEN CHAMBER

The protection devices of the combustion products are activated and determine the automatic

shutdown of the unit and the blinking symbol E5 appears on the display. This anomalydisappears only by pushing the SW3 button.

In the case in which the limit thermostat (TL) is activated, the system stops automatically and

the blinking symbol Err E8 appears on the display of the control panel. This anomaly persists

even if TL is deactivated. For resetting the normal operating system is sufficient to push the

SW2 reset button.

5.2.11. PRESENTATION OF THE GENERAL TECHNICAL DATA

- Modulation range of the natural gas 20-120 mA+5%

- Modulation range of the LPG 30-160mA+5%

- Temperature of the antifreeze function ON +60

C (domestic water sensor)- Temperature of the antifreeze function OFF +200 (domestic water sensor)



- Capacity of the burner in the antifreeze module minimum

- Capacity of the burner in the sweep-chimney module maximum

- Pump over-operation time span 24h

- Operation time of the pump in the blockage-

avoiding module 2sec

- Over-operating time 5sec- Time span for avoiding the appearance of

frequent cycles 150sec

- Temperature of the heating module OFF set value +50C

- Temperature of the heating module ON set value -50C

- Heating temperature through the floor OFF set value +50C

- Heating temperature through the floor ON set value -50C

- Temperature of the DHW module OFF set value +80C

- Temperature of the DHW module ON set value +70C

- Temperature in the domestic hot water

over-temperature module OFF +900C

- Temperature in the domestic hot water over-temperature module ON +850C

5.4. Shutdown of the unit in safety conditions

In situations in which the final user notices that the apparatus has an abnormal functioning, if

there are displayed repeatedly error codes or if the manifestations of the apparatus are beyond

his power of understanding, he is obliged to shutdown the apparatus as soon as possible and

in maximum safety conditions. For this the user has to perform the following operations:

- to push the stand-by button for interrupting the functioning of the unit.

- to disconnect the unit from the power supplying circuit by unplugging the feeding

cord.

- to disconnect the fuel supplying circuit by closing the gas taps.

- to disconnect the circulation of the domestic hot water and heating water by closing

the valves corresponding to these circuits.

After shutting down the unit in maximum safety conditions, the user will contact the service

providing company to which he is rounded of (sell chapter 1, subchapter 1.4).

5.5. Error signals

The possible errors of the system are indicated by the following codes:

E1 – insufficient water pressure in the primary hydraulic circuit

E2 – the ionization electrode does not sense the appearance of the flame. Possible defective

gas valve or absence of the gas in the circuitE3 – absence of the signal of the temperature sensor on the central heating circuit

E4 – absence of the signal of the temperature sensor on the domestic hot water circuit

E5 – problems on the combustion gases circuit

E8 – the TL sensor is activated, reset the operating system by pushing the SW2 reset button

5.6. Visualization of pressure

The pressure in the installation is shown on the display and is useful during the filling of the

installation. The user has to check periodically if the pressure in the installation did not

decrease under the set filling value.



5.7. Absence of water in the central heating circuit

The pressure will be maintained in the range of 1-2 bar. If the minimum pressure decreases

under the value of 0,5 bar, the unit will display the E1 signal and will shutdown. If the

pressure exceeds 3 bar, the safety valve will open and eliminates the accumulated pressure out

of the system.

5.8. Over-temperature safety thermostat

Is activated if the temperature of the water exceeds 950C, interrupting the operation of the

unit. After the temperature decreases to 850C, the thermostat allows automatic coupling.

The water perssostat is sealed in the manufacturer’s company with point of paint and

any adjustment made upon it during the warranty period implies the cancellation of the

warranty.

IT IS FORBIDDEN TO REMOVE THE AIR PRESOSTAT.

5.9. Sensing the absence of the draft

The safety air pressostat senses the non-functioning state of the fan in the case of the forced draft unit and displays the E5 error signal.

5.10. Additional information regarding the functioning of the unit

The boiler has several adjustment possibilities, but those accessible to the user are shown on

the contrl panel (Fig. 1)

Any other adjustment done by the beneficiary leads automatically to the loss of the warranty

because it can lead to a defective functioning of the unit.

The numbers on the control panel are only informative because the thermal comfort of the

dwelling depends on many factors: insulation degree of the building, size of the windows,

orientation of the windows, etc.

Adjustments are made according to the needs and to the external temperature of the air.

The functioning of the unit will be “without permanent surveillance”, ensured automatically

by the control apparatus mounted on the boiler and, eventually, by the environmental

apparatus (room thermostat). These apparatus must be adjusted according to the controlled

environment.

The setting of the temperature on the heating circuit will be made between 30-800C; the

environmental thermostat will be adjusted according to the desired temperature in the

respective room.

If the central heating installation will be disconnected form the power network during the cold

season or in cases in which the temperature in the boiler reaches the freezing point (00C) for a

period of time exceeding 2-3 hours because of some malfunction, it is necessary to empty the boiler, the heating installation as well as the domestic hot water installation.

Also it is necessary to disconnect the boiler form the power and gas network.

5.11. Additional facilities

- Adapting the unit to the floor heating system (maximum temperature 400C)

- By installing an external temperature sensor the unit adapts its power according to the

temperature outside the building

- Functioning of the unit with domestic hot water accumulation in a boiler

5.12. Other functions regarding the safety of the installation

- Preventive unblocking of the pump



If the unit did not operate a determined period of time (24 hours), the pump will start a few

seconds for avoiding blocking because of long-term non-functioning of the unit.

- Preventive unblocking of the deflection valve

At each stopping of the pump the deflection valve is actuated for a second and then returns to

its initial position.

- Antifreeze functionWhen the sensor of the system is recording a temperature under 60C the burner starts at its

minimum power together with the pump. This stage persists (is maintained) until the

temperature of 200C is reached.

CHAPTER 6

Putting into operation, service and maintenance

6.1. Putting into operation

First filling of the installation

Flowing water will be circulated through the whole system for eliminating dirt, impurities,etc. before coupling the unit to the heating installation

1. The boiler is connected to the heating system and the installation will be filled with

softened water.

2. The tightness of the whole system is checked. Possible leakages are to be remedied

during this stage.

3. If there are no more problems, the system will be vented and completed with water.

4. After the system has reached its working temperature it will be checked again the

tightness of the heating system.

5. A new venting of the installation will be done, followed by completion with softened

water if necessary.

6. The pressure of the system will be checked daily during 3 consecutive days and if

there is noticed a pressure loss (fact that is not abnormal because the dissolved gases

are evacuated through the automatic venting device) it is necessary to complete with

water. It is recommended also to perform in the fourth day another venting of the

installation, followed by completion with water to the working pressure.

Checking the gas feeding system

Checking will be done with soap foam for detecting possible gas losses within the whole

installation, until the gas tap of the boiler.

Checking the connection to the power networkPolarity, grounding, ground and short-circuit resistance will be checked with a multimeter.

Checking the type of gas used and setting the unit for the type of gas used

Upon beneficiary’s request the boiler can be fed with LPG by changing the nozzles of the

burner and the settings on the electronic plate. It is recommended that in case of changing the

fuel, the start-up of the unit to be done only by personnel authorized by the manufacturing

company.

The succession of the operations and their mode of execution will be done according to

Appendix B, form B1 of P.T. A1 issued by Order no. 397/22.08.2003.



Combustion adjustments

Although the value of the gas pressure is adjusted by the manufacturer, different accidental

causes or a long-term use can lead to the necessity to readjust the fine adjustment of the

combustion.

All adjustments of the gas flow rate will be made according to the specific characteristics of

the application in which the thermal unit is used. The adjustment of the modulation pressure

of the valve will be done using a pressure tester and by checking the analysis of the

combustion gases. During the analysis of the combustion gases it will be checked if the value

of the emissions are within the following limits:

Charbon monoxide – max. 100 mg/Nm3

Sulphur oxide expressed in SO2 – max 35mg/Nm3

Nitrogen oxides NOx expressed in NO2 – max. 350mm/Nm3

All these values are referred to a content of O2 of 3% volume according to the Order 462/07/1993 issued by the Ministry of Waters, Forests and Environment Rrotection.

Adjustment and sealing of the gas valve will be done only by personnel authorized by the

manufacturer of the unit.

Installing the environmental thermostat and the external sensor

The environmental thermostat is used for optimizing the electric power and natural gas

consumption and for creating an improved comfort in the room in which it is used. This

allows maintaining the temperature of the environment within the desired parameters.

The connecting procedure of the environmental thermostat is as follows:

- The frontal carcass of the unit is dismantled for having access to the electronic control box.

- On the rear side of the electronic box are the connecting plug of the environmentalthermostat and the external sensor.

- The linking electric cable (bridge) between the two terminals of the contactor is removed.

- The two wires of the linking bifilar cable to the environmental thermostat and the external

sensor are disinsulated. The thermostat is introduced and fixed by screwing in this connector.

- There are performed. the mounting procedures of the cover of the electronic box and the

frontal carcass

So the installing procedure is ended.

OBSERVATIONS:

1. The conductors of the bifilar cable between the unit and the environmental thermostatmust have a cross-section of 0,5mm and must be preferably of copper (Cu).



2. The location of the environmental thermostat must be done in such a manner that its

functioning ensures an optimum comfort. For this we recommend the location of the

thermostat at a height of 1,2m above the floor of the room.

3. The position of the switch of the environmental thermostat is marked on the diagram

of the electronic plate at the position T.A.

4. There can be used both simple thermostats and mechanical or electronic ones.

Handing over to the beneficiary

It is important to explain to the beneficiary the following:

1. The ignition and closing procedure of the boiler, including the insulation of the power

feeding part.

2. The operating mode of the boiler and possible problems that can occur. Also it will be

explained the significance of each button or switch on the control panel.

3. There will be explained to the final user the error codes and the interpretation mode of

the error codes.

4. The beneficiary will be warned that a decrease of the water pressure in the system is

caused by a leakage that must be remedied before using again the boiler.5. It is recommended that the beneficiary requests at least once a year the checking of the

operation of the boiler made by an authorized person.

6. The beneficiary will be warned about the cautions to be taken against freezing.

7. The start-up sheet will be signed and also a report of the beneficiary’s briefing in

which he signs that he has appropriated the operating modality of the boiler.

These documents are signed in the original by the beneficiary and the person who performs

the putting into operation. In the start-up report there will be registered also the possible errors

made by the installing personnel during mounting and if the person in charge with the start-up

of the installation considers that these errors are dangerous, he has the right to refuse the start-

up until their remedying.

The person who performs the start-up is not obliged to correct the mounting errors, but he

assumes his responsibility that the installation corresponds from the functional and

constructive point of view with the selected unit.

6.2. Maintenance

The maintenance operations will be done by personnel authorized by ISCIR for this type of

activity. These operations will be done according to the Service Manual distributed to the

specialized service companies.

These operations are:

- checking the type of gas

-

measuring the gas feeding static pressure and dynamic pressure- measuring the pressure of the gas at the outlet of the valve

- performing the measurements at the burner

- checking and cleaning the burner

- checking and cleaning the combustion gases/water heat exchanger

- checking and adjusting the ionization-ignition electrode

- checking the expansion vessel with membrane and the pressure in the installation

- checking the limiting element and the screen of the flow sensor (flow meter)

- checking all the connections on the primary and secondary circuit

- checking the functioning of the safety element

- checking the electrical connections

- checking the tightness of the gas pipes and gas valve- checking the closing function of the gas valve



- checking the combustion gases surveillance installation

Some of these operations are performed also at the startup of the unit and are described in the

previous subchapter “Putting into operation”.

6.3. Service

The service operations were:Diagnosis:

- Detecting the damage signals and those related to the behavior of the installation.

- Determining the causes with the help of the troubleshooting table.

Remedy:

- Establishing the necessary measures with the help of the troubleshooting table

- Remedying the damages/faults

Diagnosis and remedy

Troubleshooting table

Crt.

No.

Faults Error

signal

Cause Remedy Remedy

methods

1 Absence of

voltage

-Interrupted feeding

cord

-Switch with pearled

contacts (if they

exist)

-The continuity of the

feeding cord will be

checked

-The contacts of the

switch will be checked

-Static

-Electric

2 The water pump

does not function

-Interrupted feeding

cord

-Blocked rotor

-The presence of voltage

at the feeding terminals

of the pump will be

checked -Unblocking of the rotor

will be done by rotating

the axle of the rotor with

a screwdriver

-Dynamic

-Mechanical

4 Overheated fan E5 -Absence of power

-Interrupted winding

-The presence of voltage

at the fan is checked

-Checking the continuity

of the coil

-Static

-Dynamic

5 Defective

pressostat

E5 -Manufacturing fault -Replacing the pressostat -Static

-Electric

6 Absence of spark

for ignition

E2 -Interrupted spark

electrode wire-The distance

between the end of

the electrode and the

grounding of the unit

is too large

-Checking the continuity

of the ignition electrodewire

-Checking the positioning

of the ionization electrode

in the flame

-Measuring the distance

between the ignition

electrode and the

grounding of the unit (3-

5mm)

-Static

-Electric

7 The unit does not

receive gas

E2 -The gas valve is

defective or is notelectrically fed

-Measuring the voltage at

the inlet terminals of thegas valve (if there is

-Static

-Electric



-Defective safety

thermostat

voltage we have a

mechanical fault; it is

necessary to replace the

gas valve)

-Replacing the thermostat

8 The unit does not

deliver domestic

hot water

-Defective flow-

meter

-Replacing the defective

flow-meter

-Checking if the LED on

the body of the flow-

meter lights

-Organoleptic

9 The unit does not

increase or

decrease the

heating

temperature of the

water

-Defective gas

modulator

-Malfunction of the

electronic plate

-Replacing the gas valve

-Replacing the electronic

plate

-Dynamic

-Electric

10 The displaysignals the type E

malfunction

(malfunction of

the electronic

plate)

E0 -Malfunction of theelectronic plate

-Replacing the electronic plate if after 2-3 resets the

signal on the display does

not disappear

-Organoleptic

11 The display

signals the type E1

malfunction

(malfunction of

the water

pressostat)

E1 -Malfunction water

pressure sensor

-Insufficient pressure

in the installation

-Checking the proper

functioning of the

pressure sensor

-Organoleptic

12 The displaysignals the type E2

malfunction (the

unit does not start)

E2 -The unit does notstart

-Checking the gas valve-Checking the safety

thermostat

-Checking the distance of

the ionization electrode to

the grounding

-Checking the presence of

gas

-Organoleptic-Static

-Electric

13 The display

signals the type

E3, E4

malfunction

(defective or

unconnected

thermistors)

E3

E4

-Defective or

unconnected

thermistors

-Checking the connection

of the thermistors to the

outlet sleeve

-Replacing the

thermistors

-Organoleptic



CHAPTER 7

Main components and equipments

The main components and equipments of the C15 SPV 24 MEFM units are the followings:

7.1. Front cover – is made of pickled sheet iron with a thickness of 1mm, dyed inelectrostatic field.

It can be dismantled. By dismantling it is ensured the access to the other elements and

equipments of the unit.

The front cover together with the carcass of the unit form the pressurizing chamber which is

tight.

7.2. Combustion chamber – is made of 1mm sheet iron, has a parallelepipedic shape and is

insulated inside with ceramic fibers.

7.3. Gas valve – has the role to provide the quantity of gas necessary for combustion and is

electronically controlled for realizing the requested constant temperature by modulating thegas flow rate. The units are equipped with Honeywell (Holland) gas valves.

Pressure adjustments are made only by the manufacturer or the service representative. The

operation of the unit is permitted only with the gas valve sealed.

The assembly gas valve – combustion modulator ensures a continuously modulation at startup

and for maintaining the temperature set on the control panel, providing the minimum and

maximum pressure of the fuel imposed for operating the unit at minimum, respectively

maximum load.

On the gas feeding circuit is installed a pressure regulator which regulates the pressure at the

inlet in the unit at a value of 20mbar for natural gas and at 30-37mbar for LPG.

Control coil – safety

valve

Gas inletFeeding safety coil

Feeding modulating

coil

Inlet pressure

measuring portMechanical

adjustment head

Outlet pressure

measuring portGas outlet

7.4. Burner – has the role to mix gas and air, resulting the combustible mixture, and to direct

the flame. Is made of stainless steel with 11 ramps and 11 nozzles that are of two types. For

natural gas they have a diameter of 1,25mm and for LPG 0,77mm.



The burner is made of stainless steel and is delivered by the WORGAS Company – Italy. The

burner is endowed with an ignition electrode and an ionization electrode delivered by the

RAUSCHER Company – Germany. The ignition spark appears between the ignition electrode

and grounding.

7.5. Heat exchanger (combustion gases/water) – is monothermal, being made of oval bronze

tubes on which bronze lamellas are mounted. Its role is to realize the thermal transfer from the

flame to the thermal agent (water), which circulates inside.

The monohtermal heat exchanger is delivered by the FUGAS Company – Italy and is made of

oval tubes with ovoid wing type elements with an active part of 220x180mm2.

7.6. Plate heat exchanger – is made of sheet copper. Has the role to make the heat transfer

between the thermal agent in the heating circuit and the water in the flowing water circuit. It

is mounted on the hydroblock.

7.7. Safety valve – protects the thermal unit and the installation, opening when the pressure

exceeds 3bar.

7.8. Circulation pump. The circulation of water in the heating installation/boiler is madewith a GRUNDFOS circulation pump (Denmark).

If it is noticed that the power of the pump is not sufficient for an installation (namely it has a

total pressure drop higher than 6m water column) then it can be linked in series another

circulation pump.



7.9. Expansion vessel – has the role to take over the thermal dilatation in the central heating

circuit and has a capacity of 7 liters.

The ZILMET expansion vessels (Italy) the unit is equipped with are closed expansion vessels.

If the total volume of the expansion vessels is not enough, there can be mounted additional

expansion vessels directly on the installation.

7.10. Flow meter – has the role to sense the appearance of a flow on the domestic hot water

circuit.

7.11. Three-way valve

Description and functioning: has the role to realize the transfer from the heating circuit on the

short domestic hot water preparing circuit by obturating the circulation of water in the heating

line in favor of the internal line of the unit which contains the plate heat exchanger for

preparing domestic hot water.

7.12. Fan – its role is to evacuate the combustion gases. The fan has variable speed that is

controlled by a Hall type sensor.

The speed of the fan is directly proportional with the value of the gas flow rate regulated by

the modulating valve, so it results a quasi-constant air excess on the whole range of thermal

loads which leads to a major decrease of the CO and NOx values and implicitly to theimprovement of the efficiency of the combustion.

By using this system the obtained yields are over 90% at any thermal load by which the boiler

is functioning. The C15 SPV 24 MEFM units are endowed with LN di NATALINI LINO

monophase fans (Italy) with one functioning stage and with a high degree of silencing.

7.13. Air pressostat – has the role to sense the absence of draft and to control the shutdown

of the boiler (by controlling the electronic ignition) if this is not functioning, does not function

correctly or when evacuation tubing of the combustion gases is obturated.



Ad ustin screw

Port

Fixin hole

Common

7.14. Evacuation kit – has the role to support the evacuation of the combustion gases and to

ensure the airflow to the combustion chamber.

The combustion gases evacuation and air feeding kit is manufactured by the Company LN di

NATALINI LINO – Italy.

It is used only at the unit versions with forced circulation and consists of two concentrically

mounted tubes which are making the linkage with the outside of the room.

7.15. Hydroblock inlet – hydroblock outlet – plate heat exchanger assembly

Is produced by FUGAS Company – Italy.

With the help of the hydroblock the filling of the central heating circuit is realized by opening

the valve. The fluxostate (Hal sensor) is hydraulically attached and has the role to sense the

domestic hot water demand.

Also on the hydroblock is installed the water pressostat and the control device of the three-

way valve.



7.16. Control plate – realizes the interacting between the automation elements.

The control, protection and automation system ensures the following functions with the

observation of the Technical Prescription in force:- Pre-venting of the burning chamber

- Ignition of the flame

- Signaling the temperature and pressure of the water in the unit

- Regulating the temperature on the heating circuit

- Regulating the temperature on the domestic hot water circuit

- Starting of the pump if a demand for heating water appears

- Safety of the thermal unit at over-temperature and over-pressure

- Absence of draft (air pressostat)

- Safety of the thermal unit at the minimum level of water (water pressostat)

- Sensing the demand for domestic hot water (flow-meter) and granting prevalence to

this consumptionThese functions are ensured by the automation block (electronic plate) BRAHMA S.p.A. –

Italy, with ignition transformer TR2 of 15kW working at 220V – 50Hz with the role of

functioning controller of the thermal unit.



CHAPTER 8

Used standards

Agreements and certifications

At the base of the design and manufacturing of the mural thermal units C15 MT SPV 24MEFM lay the following standards and technical prescriptions:

SR EN 60335-1: May 1999 CEI 60335 – 1st of May 1999

SAFETY OF THE ELECTRICAL APPARTUS FOR HOUSEHOLD USE AND SIMILAR

SCOPES

SR EN 50165: May 2001

ELECTRICAL EQUIPMENT OF NON-ELECTRIC APPARATUS FOR HOUSEHOLD

USE AND SIMILAR SCOPES

SR 66: April 2001

LIQUEFIED PETROLEUM GASES

ROMANIAN STATE STANDARD STAS 3317-67

COMBUSTIBLE GASESSR ISO 13443-87

NATURAL GASES: STANDARD REFERENCE CONDITIONS


THREADS FOR PIPES WITHOUT TIGHTNESS BY THREAD

DIMENSIONS AND TOLERANCES

SR ISO 7-1: 2000

THREADS FOR PIPES WITH TIGHTNESS BY THREAD

PART 1: DIMENSIONS, TOLERANCES AND MARKING


LIMIT DEVIATIONS FOR DIMENSIONS WITHOUT TOLERANCE

INDICATIONS OBTAINED BY CUTTING, STAMPING OR BENDING, STEEL PARTS.

SR EN 22768-1 ISO 2768-1ST OF JUNE 95

GENERAL TOLERANCES, PART 1: TOLERANCES FOR LINIAR AND ANGULAR

WITHOUT THE INDICAION OF INDIVIDUAL TOLERANCES

SR EN 22768-2 ISO 2768-2 ND OF JUNE 95

GENERAL TOLERANCE, PART 2: GEOMETRIC TOLERANCE FOR ELEMENTS

WITHOUT THE INDICATION OF INDIVIDUAL TOLERANCES

SR EN 297+A2: 2001

CENTRAL HEATING BOILERS USING GASEOUS FUELS TYPE B(11) AND B(11BS)

BOILERS EQUIPPED WITH ATMOSPHERIC BURNERS WITH A NOMINAL CALORIC

RATE SMALLER OR EQUAL TO 70KWTECHNICAL PRESCRIPTION PT A1-2002

TECHNICAL REQUIREMENTS REGARDING THE USE OF GASEOUS FUELS

CONSUMING APPARATUS.



CHAPTER 9

Labor protection and fire-fighting norms

- Methodological norms for applying Law no. 90/ 12th of July 1996 regarding labor

protection- Specific labor-safety norms for works of technical-sanitary and heating installations

- Specific labor protection norms for works of mounting technological equipment and

metal structures

- Fire-fighting prescriptions according to the legislation regarding preventing of fires

and fire-fighting in force

- Decisions of local institutions qualified for heating installations



Hydraulic diagram

of the mural thermal unit with forced draft C15 SPV 24 MEFM

LEGEND

1 – Electric sensor with Hall sensor A – Inlet-heating

2 – Primary heat exchanger B – Outlet-hot water

3 – Secondary heat exchanger C – Inlet-gas

4 – Ignition + ionization electrode D – Inlet-cold water

5 – Electric pump with de-aerating device E – Outlet-heating

6 – Burner

7 – Gas modulator

8 – Safety valve – 3 bar

9 – Filling tap

10 – Flow-meter for the sanitary circuit11 – Automated by-pass

12 – Three-ways valve

13 – Temperature probe for hot water

14 – Pressostat – minimum water pressure

15 – Over-temperature thermostat

16 – Temperature probe for heating

17 – Expansion vessel

18 – Air pressostat

19 – Evacuation tap



Scheme for realizing the connections for the mural thermal unit with forced draft

C15 SPV 24 MEFM

APPENDIX 6



Mounting on the wall with the observance of the slope for the mural

thermal unit with forced draft C15 SPV 24 MEFM

APPENDIX 6



Types of mounting configurations for the mural thermal unit

with forced draft C15 SPV 24 MEFM

APPENDIX 5

-forced draft-



Location of the connections at the mural thermal unit with forced draft

C15 SPV 24 MEFM

CONNECTION DIMENSION

1. Inlet domestic water ½” – outside thread

2. Outlet domestic water ½” – outside thread

3. Inlet central heating ¾” – outside l thread

4. Outlet central heating ¾” – outside l thread

5. Gas supply ¾” – outside l thread

INLET DOMESTIC HOT FUEL COLD OUTLETCENTRAL HEATING WATER SUPPLY WATER CENTRAL HEATING

3 2 5 1 4