Econet Heating And Cooling Transfer 2007 06 8024 Gb

ECONET ® heating and cooling transfer Air Handling Units, Planning, Dimensioning

May 2007

Sida 9/16

Fläkt Woods

ECONET® heating and cooling transfer • Air Handling Units • Planning • Dimensioning GUIDE

8024 GB 2007.05 Page 2 Subject to alteration.

Contents

Heating and cooling transfer................................................................................................................3

Dimensioning principles ......................................................................................................................4

Connection of additional energy ........................................................................................................6

Scope of delivery....................................................................................................................................7

Assembly and installation ..................................................................................................................10

Control and electricity installation ....................................................................................................13

Functional description ........................................................................................................................16

Code key................................................................................................................................................18

Fläkt Woods

ECONET® heating and cooling transfer • Air Handling Units • Planning • Dimensioning


GUIDE

ECONET® heating and cooling transfer

The ECONET® concept integrates energy recovery, airheating and air cooling into one system. By doing thatfewer components are required such as heating/coolingcoils, pumps, valves, piping, insulation etc. The result isa shorter, more compact air handling unit.

The coils are extremely efficient and the temperaturedifference between the liquid and the air is small. Thispermits either low temperature energy sources or largetemperature differences to be used for the heating orcooling energy. Additionally, the heat recovery efficiencyusing ECONET® is improved by approximately 10…20%compared to traditional run around coil.

Function

Heat recovery The system optimizes the liquid flow in the coils to produce the best possible heat recovery.The liquid flow is regulated by the frequency controlledpump.

Heat recovery + additional heat The system optimizes the liquid flow in the coils to pro-duce the best possible heat recovery. Supplementary heatcan be supplied to the circuit, either directly or via a heatexchanger.

Cooling The exhaust air coil is disconnected and additional cool-ing is supplied to the circuit so that the cooling liquidonly circulates through the supply air coil. Additionalcooling is either supplied to the circuit directly or via acooling exchanger.

Cooling recovery (example IEC) Exhaust air is cooled through humidification with indirect evaporative cooling (Coolmaster). The coolingpower is transferred via the recovery system to the supply air. The liquid flow is optimized and if necessaryadditional cooling can be supplied.

Fläkt Woods



ECONET® dimensioning principles

Dimensioning, heating For the heating situation, ECONET® either attempts toutilize low temperature heating water (waste/conden-sate heat) or large temperature differences for the heat-ing water (decreased hot water flows)

Heating mode normal solution, figure1:In the heating mode a heating water temperature ofabout +27°C is sufficient to heat 8.5 m3/s air from -12°Cto +20°C. Supplementary heating is supplied to therecovery circuit via an external exchanger. A loss ofapprox. 2°C over the exchanger gives us a primary heat-ing temperature of 29°C meaning that all warm/hotwater over 29°C is enough for the ECONET system.

Either the system utilizes low temperature heat aswaste/condensate heat or a large Δt of the hot water.

Heating mode dry box solution, figure 2: The functionality of this solution is the same as aboveadded with a protection of the supply air filter. The ideais to divide the supply air coil into 2 coils, one before thefilter and one after the filter. The first coil (pre heater) preheats the out door air by min. 3°C Δt. the relative humid-ity into the filter drops which gives the filter a longer lifetime. The pre heater coil is easy to clean with water.

(151 kW)

19°C

24°C (60 kW)

23°C

20°C-4°C0°C

Figure 1. ECONET® heating mode either with low temperature heating wateror large Δt for heating water.

Figure 2. ECONET® heating mode with dry box solution, protection of supplyair filter.

23°C

18°C

27°C

20°C-12°C

(235 kW)

(103 kW)

Fläkt Woods



GUIDE

For the cooling situation, ECONET® is either used as apure cooling coil or combined as a cooling coil and acooling recovery function.

In the case of only cooling the supply air coil is used tocool the air, i.e. in this case the exhaust air coil is idle. Ahigh return temperature on the cooling water is obtained,which gives a small cold water flow.

In the case of cooling combined with cooling recovery,both the supply air coil and the exhaust air coil are acti-vated.

Cooling mode, figure 3: In the cooling mode a cold water temperature of about+10°C is sufficient to cool 8.5 m3/s air from +32°C, 40%to +15°C. Supplementary cooling is supplied to the cir-cuit via an external exchanger. A loss of approx. 1..1,5°Cover the exchanger gives us a primary cooling tempera-ture of 9°C meaning that all cold water under 9°C isenough for the ECONET® system. The return water to thecooling system will be high, up to 28°C, which gives us ahuge Δt (19°C ) and very small cold water flows. A con-ventional cooling system with the cooling water at +7°C/+12°C would required a liquid flow of about 11 l/scompared to 3 l/s for the ECONET® solution (233 kW,9/28°C).

Cooling mode combined with cooling recovery, figure 4: The same operating circumstances as previously, butadditional cooling combined with cooling recovery.In the cooling mode combined with cooling recovery thepower demand from external source (chiller) can bereduced by approx 47 kW (233 kW -> 186 kW).

A cold water temperature of about +10°C is sufficientto cool 8.5 m3/s air from +32°C, 40% to +15°C. Supple-mentary cooling is supplied to the circuit via an externalexchanger. A loss of approx. 1..1,5°C over the exchangergives us a primary cooling temperature of 9°C meaningthat all cold water under 9°C is enough for the ECONET®

system. The return water to the cooling system will behigh, up to 24°C, which gives us a huge Δt (15°C ) andvery small cold water flows.

ECONET® dimensioning principles

ºC 29°C

10°C

15°C32°C, 40%

(233 kW)

Figure 3. ECONET® Cooling mode.

Figure 4. ECONET® Cooling mode combined with cooling recovery.

(47 kW)

25°C

10°C(186 kW)

24°C

15°C32°C, 40%

C

Fläkt Woods



ECONET connection of additional energy

The ECONET® system consists of one supply and oneexhaust air coil as well as a transfer circuit to which theheating and cooling energy systems are connected.Antifreeze is used in the ECONET® circuit and is usuallyof the type 25 ...35 % water/ethylene glycol mixture.

Usually the energy recovery circuit has to be separatedfrom the additional heating and/or cooling circuits by aheat exchanger for additional heating and/or a coolingexchanger for additional cooling. In that way the func-tionality and responsibilities are clear. The functionality ofthe air handling unit is therefore not in the same waydepended on the primary energy circuits, maintenance,failure etz.

Dimensioning of the energy exchanger package (addition-al heating or/and cooling) can be made and selected asan accessory in FWG selection programs for AHU (Acon).The program selects suitable energy exchangers, expan-sion vessel and nessessary equipment, according to thedelivery, see figure 6.

If the energy exchanger package is not ordered fromFWG, the Acon selection program will give You all in dataneeded to select the exchanger by Your self. Output datafrom the selection programs will be: additional powerneeded, liquid temperatures in/out and the liquid flowfor the secondary circuit.

If additional heating is divided into two sources, primaryheating and waste/condensate heat and additional cool-ing is connected, three exchanger might be needed

If only additional heating is connected to the ECONET®

circuit, only one exchanger is needed.

Figure 7. Principle of 2 separate exchangers for additional heating and 1 foradditional cooling

Figure 5. Principle of separate exchangers for additional heating and cooling.

SV 30a (heating 1)

SV 30b (heating 2)

SV 50 (cooling)

SV 30 (heating)

SV 50 (cooling)

Figure 6. 1. Plate heat exchangers for supplementary heating/cooling2. Pipes for ECONET® pump unit 3. Shut-off valves4. Drain valve, Filling valve5. Special designed stand6. Expansion vessel with a safety valve

Every pipe is market with necessary connection information

1 1

622

3 3

4

5

Fläkt Woods



GUIDE

ECONET® scope of delivery

System overview:

Single pump units or double pump units (1 or 2) illustrat-ed in the figure are delivered separately from the AHU.The pump unit is equipped with a stand for mounting ona flat floor. For a single pump solution, it can be mountedon the supply air coil (check dimensions and the layout forthe AHU) or separately from the AHU. For a doublepump solution, the pump unit has to be mounted sepa-rately from the AHU.

The pipework within the pump units (1 and 2) is protectedagainst rusting and insulated with Armaflex.

The sensors and components within the pump units (1)are mounted and wired to the ECONET® control box.

The ECONET® control box is mounted on the pump unitand pre-programmed with specific data for the project.

The frequency inverter/inverters is/are mounted on thepump unit and wired to the pump/pumps and theECONET® control box.

The supply air coil and exhaust air coil (15, 16) are mount-ed in the air handling unit.

GT41

MT

MT

GT42

MP

GP40

SV40

+-

+

MT

GP41

-

GT40

6

2

7

8

9

3

1

10

1112

1314

15

16

17

21 22

18

19 20

4 4

5a5b

5a

1. Pump unit2. Single-pump solution3. Double-pump solution4. Controller5. a) Frequency inverter 1

b) Frequency inverter 26. Pressure gauge with contact function7. Sensor, frost protection8. Shutoff valve/flow measurement9. Control valve10. Sensor, ice protection11. Non-return valve12. Shut-off valve13. Differential pressure transmitter14. Sensor, temperature15. Exhaust air coil16. Supply air coil 17. Non-return valve18. Non-return valve19. Shut-off valve20. Shut-off valve21. Shut-off valve22. Shut-off valveMP. Pressure gauge MT. Thermometer

Fläkt Woods




1= heating/cooling:in, 2=supply air coil:in, 3= supply air coil:out, 4=exhaust air coil:in, 5= exhaust air coil:out, 6=heating/cooling:out

Removable legsmax 500 mm

H1

D1

3

54

5 4

2

3

2 6

1

6

1

LL

H2

H2 H3

H3

D2

D1

D2

EU SIZE L D1 D2 H1 H2 H3 PIPE SIZE

20-41 600/621 760 828 640 1953/1671 1232/962 DN 25-32

42-60 730 910 1011/1008 640 2089/1842 1391/1142 DN 50

62-84 800 960 1053 640 2096 1407 DN 65-80

Left-hand design Right-hand design

Heat exchanger:The ECONET® heat exchangers consist of a finned coil/coilsin the supply air unit and one in the exhaust air unit withfunctions for heat/cooling recovery, heating as well as coolingof the supply air. The coils are equipped with drip trays andconnections for air purging and drainage. A droplet elimina-tor should be chosen if the air velocity through the coil ishigh. The coils are manufactured from copper tube, which isexpanded against aluminium fins. The header consists ofeither copper or rust-protected steel. The maximum operatingpressure of the coils is 1.5 MPa, and the test pressure is 2 MPa.Other material for the tubes, fins and the framework can bespecified in the Acorn selection program.

Coils with hygiene fins should be specified if cleanabilityof the coils according to standards VD13803 and VD16022 isrequired.

The supply and exhaust air coils are connected togetherby a liquid circuit with the possibility to connect externallysupplied energy or heating/cooling.

(EURZ-05 ECONET® Exchanger Package, see separatemanual).

Pump unit:The pump unit consists of a pump/pumps, pipes , valves,sensors, frequency inverter/inverters and a controller forECONET® energy recovery.

The pipes in the pump unit are anti rust painted and insu-lated with Armaflex. The pump/pumps consists of a baseand a pump head, between which the chamber stack and theouter sleeve are secured by means of staybolts. The base andpump head are made of cast iron, and all other wetted partsare made of stainless steel, DIN 1.4301. All pumps areequipped with a maintenance-free mechanical shaft seal ofthe cartridge type. Max . operating pressure for the pump is16bar / 160 mWC / 1.6 MPa.

The pump unit is designed to be mounted separately witha stand for mounting on the floor. For a singel pump solutionit is possible to connect it directly to the coil connection on thesupply air side (check dimensions and the layout for theAHU). The pump unit is delivered separately on a pallet.

The picture shows size EU:42-60

Fläkt Woods



GUIDE

Controller for heat recovery, frequency inverter andsensors:

The liquid flow in the ECONET® circuit is controlled bythe frequency inverter/inverters for the pump/pumpsand by an ECONET® controller. The controller isequipped with software that optimizes the circulationflow in the circuit for each operating condition. The soft-ware in the controller includes protection and alarmfunctions.

The controller is LonWorks or Modbus compatible.Modbus communication is intrinsic to the controller, andthe LonWorks card for the controller can be chosen as anaccessory. The controller is mounted on the pump unitand is programmed with input data for the specific pro-ject. Cables are routed between the controller and the fre-quency inverter.

The frequency inverter for the pump is mounted on thepump unit, and cables are routed to the ECONET® con-troller and the pump.

Necessary components such as pressure and temperaturesensors for the pump unit are included. Componentswithin the scope of the delivery are installed, and cablesare routed to the ECONET® controller and the frequencyinverter. The additional components/sensors needed forthe calculation of energy recovery efficiency are includedin the delivery, if specified, but mounting and cabling hasto be done on site (not included in Fläkt Woods delivery).

PackagingSuitable packaging protects the ECONET® unit duringtransport. This is fully environmentally compatible, andshould be taken for central disposal as a secondary rawmaterial.

Commissioning:In order to guarantee safe and optional functionality forECONET® heat recovery, commissioning of eachECONET® system shall be carried out by accredited andtrained personnel. Commissioning of ECONET® can beordered and carried out via the Fläkt Woods sales organisation, see order code.


EU SIZE L D H1 H2 PIPE SIZE

20-60 850 887 200 1299 DN 25-50

62-84 1398 2015 269 2795 DN 65-80

H1

H2

D L

3

2

6

4 5

1

6

1

1= heating/cooling:in, 2=supply air coil:in, 3= supply air coil:out, 4=exhaust air coil:in, 5= exhaust air coil:out, 6=heating/cooling:out

Fläkt Woods



UnpackingInspection of delivered equipment– Check for signs of transit damage.– Check that the product codes on the rating labels

conform to your requirement.– Check the delivered components against the bill of

material.– The code for the pump unit (STYZ-74-…) can be

found on the ECONET® control box.

Installation instruction:The following must be carried out on site by theplumbing/automation and electrical contractors.

– Assembly of the pump unit, installation of pipes fromthe exhaust air coil and connection to the exhaust airand supply air coils.

– Installation of necessary components for connectingan external energy source, as set out in the documen-tation.

– Filling and air purging of system.

– Power supply to the ECONET® controller and frequency inverter.

– Connection between the ECONET® controller and thecontroller for the AHU.

– Wiring between the air flow sensor (supply air) andthe ECONET® controller.

– Mounting and wiring of the delivered sensors neededfor energy recovery calculation, GT00, GT10, GT20,GT30, GT21, air flow sensor (exhaust air).

– Commissioning of the ECONET® system.

– Controls for AHU, SV 30, SV 50, etz.

ECONET® assembly and installation

GT40

(EURZ-05 ECONET® Exchanger Package, see separate manual).

Fläkt Woods



GUIDE


Coil installationThe coils are installed in the air handling units at the factory.

The coils must be connected as a counter-flow connec-tion. Warm against warm and cold against cold. All con-nections are marked with labels.

If a dry box solution is specified, the supply air coils aredivided into two coils, one before and the other after thesupply air filter. The supply air coils must be connectedas a serial connection. First to the main supply air coil(after the filter) and then as a serial connection to the preheater coil (the coil before the filter).

Pipe installationConnection to the pipe system should be carried out bythe plumbing contractor.Installation normally includes:– Installation of necessary components for connecting

an external energy source, as set out in the documen-tation. The necessary components vary depending onthe design of the object. Examples of external components are:

Expansion vessel Heat exchanger and valves for supplementaryheating/coolingExternal shut off valvesConnection for fillingAutomatic air purging valve combined with amanual air purging valve Air purging valves for micro bubblesFilter Charging equipmentWater trapAnti-freeze liquid

– Installation of pipes between the pump unit and theexhaust air coil

– Connecting the supply air and exhaust air coil– Filling of liquid and air purging of the pump before

commissioning– Air purging the system

If the exchanger package is delivered from FläktWoods:

Mounting and installation of the exchanger packageto the ECONET® pump unit, and connection of theexternal energy sources, including necessary valves,etc. Please see separate instructions for more specificinstallation details.

The ECONET® must be connected to the pipe system sothat expansion forces or the pipe system’s own weight donot impose a load on the liquid connections. The liquid connections are provided with signs for theinlet and outlet.

Mounting of the pump unitThe pump unit is equipped with a stand for mounting ona flat floor. For a single-pump solution, it is possible toconnect the pump unit directly to the supply air coil,although be aware that in some cases the pump unitmight be in the way of AHU doors or other equipment.For a double-pump solution, the pump unit must bemounted separately from the air handling unit.

Preheatercoil

Supply air

Main supplyair coil

Director of the flow

To exhaust

coil

Make sure that all inspection doors can be opened after the pipingare installed.

Fläkt Woods



General advice Failure to observe general advice and installation require-

ments can lead to the risk of damage.

Flushing the pipe system:– ECONET® pump units are cleaned and flushed at the

factory. When flushing the remainder of the system, we

recommend that the pump unit is disconnected and that

the P40 pump is not used during flushing.

It is extremely important to remove all the

flushing/cleaning fluid from the system before filling

with anti freeze as a chemical reaction can occur between

the cleaning and anti-freeze liquids. As the coils cannot

be emptied completely, they must not be exposed to the

cold without anti-freeze.

Filling:

– For optimal heat recovery, we recommend an approximate

25-35% ethylene glycol mixture. Max mixture for the pump

is a 40% ethylene glycol mixture. The P40 pump should

not be used when filling the system.

Use a separate filling system, e.g. a separate pump with a

non-return valve for filling the system, e.g. a hand pump.

– Fill until a static pressure of 1-1.5 bar is obtained on the suc-

tion side of the pump to avoid the risk of pump cavitation.

– Uses premixed anti-freeze liquid, type ethylene glycol/

water mixture. Prevent exposure to oxygen. When using

concentrated ethylene glycol, it must be mixed with dis-

tilled water. The liquid must be mixed 24 hours in advance,

so that the mixture will be free of micro bubbles. When fill-

ing with premixed liquid from a tanker lorry, ask for a

flushing certificate.

– Mark the system with a label showing the actual flow, type

of anti-freeze liquid, and concentration.

– Check for, and seal any leaks.

– Check that the anti-freeze liquid used has sufficient protec-

tion against corrosion, anti fouling and biological growth.

Follow the instructions of the anti-freeze liquid manufac-

turer.

Air purging:

To get rid of all air in the system takes time, but is vital for the

performance. Use automatic air purge valves combined with

manual air purge valves. Prevent the risk of contamination

blocking the sealing and jeopardizing the shut-off function of

the automatic air purge valve. Install a filter if there is a contin-

uous problem with contamination. When the system is free of

all air, make sure that all automatic air eliminators are OK and

all manual valves are closed.

Open and close all valves a couple of times. Close the

by-pass valve and start the ECONET® pump. The pump should

be run manually via the frequency inverter at maximum 30 Hz.

Under no circumstances must the pump be allowed to run

dry, due to the risk of damage to the seals. Purge the air from

the pump with its own purging valve. Make sure that the sys-

tem pressure is maintained at 1–1.5 bar. Refill the system con-

tinuously as the pressure decreases. If the pressure drops below

0.5 bar, there will be an A-type alarm from the controller.

Miscellaneous:

– Under no circumstances may the P40 pump be run dry.

This is because the pump will be damaged by the air,

resulting in leakage.

– The coils for supplementary heating/cooling have to be

installed with separate shut-off valves. The total pressure

drop for the heat exchangers on the secondary side must

not exceed 40 kPa at the maximum liquid flow for a closed

heat recovery circuit. A higher value should be taken into

account when dimensioning the system.

The purging, safety valve and drain connections must be

routed to the connection vessel next to the unit.

– Use air purge valves that can handle micro bubbles (type

Spirovent or Flamcovent).

– The vessel must be installed on the suction side of the

pump (between the pump and the plate heat exchangers

for supplementary energy) with a volume of at least 5 % of

the total system volume and with 1.0 bar pre-pressure, 4.5

bar opening pressure.

– If the risk of cavitation is present on the suction side of the

pump, it is advisible to install underpressure air elimina-

tors.


The purging, safety valve and drain connections arerouted to the connection vessel next to the unit.

Fläkt Woods



GUIDE

ECONET® control and electrical installation

Electrical connection and recommended fusesBoth the cabinet and the inverter must be connected viadisconnecting switches.Main power shall be 3x400 VAC. An electrician shalldimension the fuses for the pump according to the tablebelow, and according to the site circumstances.Recommended minimum fuse for the cabinet is 10 A.

AHU SIZE PUMP OUTPUT MAX. CURRENT

20 0.55 kW 1.44 A

21,22,30 0.7 kW 1.9 A

31 1.1 kW 2.55 A

32,40 1.5 kW 3.15 A

33,41,42,50,51 2.2 kW 4.45 A

44 3.0 kW 6.35 A

52,60,53,62 4.0 kW 8.0 A

71,64,80,73,82 5.5 kW 11.2 A

84 7.5 kW 15.2 A

Table 1 Single pump max. currents. Pump data due to the size of theair-handling unit. The fuse size depends on site-specific circum-stances and must be dimensioned by an electrician.

AHU SIZE PUMP OUTPUT MAX. CURRENT

20,21 2 x 0.55 kW 2 x 1.44 A

22,30,31 2 x 0.7 kW 2 x 1.9 A

32,40,33 2 x 1.1 kW 2 x 2.55 A

41,42,50 2 x 1.5 kW 2 x 3.15 A

51,44,52,60,53,62 2 x 2.2 kW 2 x 4.45 A

71,64,80,73,82 2 x 4 kW 2 x 8 A

84 2 x 5.5 kW 2 x 11.2 A

Table 2 Twin pump max. currents. Pump data due to the size of theair-handling unit. The fuse size depends on site-specific circum-stances and must be dimensioned by an electrician.

Fläkt Woods



Control cabinet installationConnect the power supply cable to 230 VAC terminalsQ01: L1, N, and PE (protective earth).

AHU controller signals.Connect the AHU controller signals to terminals accord-ing to the illustration below. Note that the B-type alarmand pump 2 running indication (P40.2.I) are relevantonly in twin-pump versions.

In the event that some signals measured or calculated bythe Econet controller are relayed as voltage signals to anexternal controller, connect the cable according to the fol-lowing picture. Three temperature measurements (tmp)and one efficiency signal (eff) are available for relaying.


0-10VDC

Cooling

P40.1.I Indication

A-type alarm

Start

Cooling recovery

P40.2.1 Indication

B-type alarm

Main supply 230 Volt 50Hz Max 10A LNPE

MAIN

Controlsignalground com GO

0-10V Signal Y

C NO

Common

P40.1.I Indication

Common

A-type alarm

1

2

5

6

9

10

13

14

Controlsignalground com GO

C NO

C NO

Common

P40.2.I Indication

Common

A-type alarm

3

4

7

8

11

12

15

16

X11:6

X11:5

X7:1

X7:2

X7:3

X7:4

X8:1

X8:2

X5:5

X5:4

X6:2

X6:1

X5:2

X5:1

X6:5

X6:4

-RC1

Efftmpcom

BMS

BMS

-RC1

X10:1

X10:2

X10:4

X10:5

P40.1.I

P40.2.I

A-Larm

B-Larm

tmptmpcom

70

-X1

Fläkt Woods



GUIDE

Sensor cable connectionsSupply Airflow sensor signalThe supply airflow signal (GF10) must be connected in allproduct versions before commissioning the unit. The signal transducer is part of the air handling unit delivery.

Connect the airflow sensor according to the illustrationbelow.

Frost building GT41

Outdoor temp GT00

Exhaust air tempGT20

Heating/cooling liquid temp GT30

Supply air temp.GT10

Extract air temp.GT21

X11:13

X11:14

X12:1

X12:2

X12:3

X12:4

X12:5

X12:6

X12:7

X12:8

X12:9

X12:10

X12:11

X12:12

X12:13

X12:14

Air flow sensor,exhaust air

GF20

G

GO

OUT

Air flow sensor,supply air

GF10

–X1

51

52

53

54

55

56

57

58

Exhaust Airflow sensor signalThe supply airflow signal (GF20) must be connected in theproduct version with heat recovery efficiency measure-ment. The signal transducer is part of the air handling unitdelivery. Connect the airflow sensor according to the illustration above.

Temperature sensor content of delivery and installationThe temperature sensors are included, and their location isapparent from the list of components and the flow dia-gram in the documentation.

All temperature sensors are connected in the electricalcabinet via terminals. All the air temperature sensors arewithout cables. All the sensors should be fitted in the airduct, approximately 1.5 m from any duct heaters, to givestable measurement values.

Water temp. at the pump GT40

Ice building GT42

–RC1


Fläkt Woods



ECONET® functional description

FunctionThe heat recovery function is controlled by the ECONET®

control box. The specific functions for the AHU must be controlled by a separate controller (not included in theECONET® delivery). The functions below describe the inter-nal heat recovery function for ECONET®. The process andinstrumentation diagram for ECONET® is shown below.

Air handling unit not running:When the temperature GT41 is below +16°C, the pumpwill start to operate at a constant low speed. When the liquid temperature GT41 is higher than +17°C, the pumpP40 will stop.

Start of the air handling unit:When ECONET® receives a start-up signal, the pump P40starts to operate at a constant high speed after 3 minutes.After that the pump goes to optimal sequence.

Main function:ECONET® is a part of the sequence to control the supplyair temperature to its set point.

Main functions of ECONET® control box (control sequence):• Cooling recovery, On/Off signal

The pump P40 and frequency converter FO40 regulatethe liquid flow to an optimal value for cooling recovery,and by-pass valve SV40 will then close. NOTE. The heatrecovery signal must be 0%

• Supplementary cooling, On/Off signalThe pump P40 and frequency converter FO40 regulatethe liquid flow to the optimal value for supplementary cooling. SV40 will open. NOTE. The heat recovery signal must be 0%

• Heat recovery, 0...100%, 0..10 V signalThe pump P40 starts at minimum speed, the valve SV40moves from open to closed, pump P40 goes from mini-mum speed to optimal speed (optimal heat recovery liquid flow).

• See below for twin-pump function and other supportfunctions, further down.

Frost and ice protection• Frost protection: Protection against frost formation on

the exhaust air coil (air side). The liquid temperature at GT41 is prevented from drop-ping below the temperaure (approx.-3°C) for frost protec-tion by regulating the liquid flow with the pump P40 andFO40 from optimal liquid flow to an increased liquid flow.

GT21

GT42

GP41

GT41

GT40

GT00

GT10 GF

10

FO40.2

P40.2P40.1FO

40.1

V2V1GT30

GT20

GF20

SV40

Exhaust coil

Exhaust air

Supply coil

Supply air

Supplementaryenergy

Twin pump

* GT30 alternativelyon the supply pipe tothe heat exchanger

*

ECONET, extended delivery: Standard/normal: GT40, GT41, GT42, SV40, GP41, GF10,FO40.1, P40.1 Double pump: FO40.2, P40.2 Effi ciency calculation: GT 00, GT10, GT20, GT21, GT30, GF20

Fläkt Woods



GUIDE

ECONET® functional description

• Risk of frost formation: When the liquid temperature GT41 falls below the A alarm value (approx. -10°C), the A-type alarm isgiven.

• Ice protection: Protection against ice formation in theheat exchangers for supplementary heating/cooling(water side).The liquid temperature at GT42 is prevented from drop-ping below the temperature (approx. 6°C) for ice protec-tion by regulating the liquid flow with the pump P40 andFO40 from optimal liquid flow to an increased liquid flow.

• Risk of ice formation: When the liquid temperature GT42 falls below the A alarm value (approx. 2°C), the A-type alarm is given.

Alarms• A-type alarms:

– Risk of frost formation, GT41 ( - 10°C) – Risk of ice formation, GT42 (+ 2°C)– Pump indication not the same as set value (conflict alarm, should run but does not, or should notrun but does)– Low pressure in ECONET® liquid circuit – Internal hardware fault (heat recovery, GF10, GT41, GT42)

• B-type alarms:– One of the twin pumps has stopped when it should run

Support functions• Redundant pumps

The ECONET® product version with redundant pumpshas two pumps (P40.1 and P40.2) and frequency convert-ers (FO40.1 and FO40.2) running in parallel. They arestarted and controlled in parallel. In the event of one ofthe pumps failing to run, the other pump continues torun automatically. Failure of one pump is indicated withthe B-type alarm. The ECONET® unit continues runningaccording to control signals with one pump only.

• Energy and Power calculationIf energy calculation is specified, the ECONET® con-troller calculates an estimate of momentary power for

– Recovered power– Additional power and– Power to the supply air

The same momentary powers are accumulated to energy, and the following energy consumption valuesare calculated:

– Recovered heating energy– Recovered cooling energy– Additional heating energy– Additional cooling energy– Heating energy to supply air– Cooling energy to supply air

Calculated power and energy values are shown locallyor via the communication interface. The calculated values are estimates only and are not calibrated. Theycan be used for general monitoring, but not as the basisfor functions such as invoicing, for example.

• Efficiency calculationIf necessary, additional measurement sensors (GT00,GT10, GT20, GT21) are installed and connected. TheECONET® controller then calculates the heat recoveryefficiencies. The following efficiencies are calculated:

– Supply air temperature heat recovery efficiency– Exhaust air temperature heat recovery efficiency– Momentary power heat recovery efficiency

Due to measurement inaccuracies and small tempera-ture differences the calculated efficiency values mayexceed 100%.

• MonitoringTwo additional sensors (GF20, GT30) are used for diagnosing the operation of the ECONET® unit.

– Exhaust airflow sensor: In order to evaluate heat recovery efficiency, the supply and exhaust flows must be equal– Additional heating/cooling liquid temperature: The temperature level must be high enough to provide necessary additional heating/cooling.

Fläkt Woods



ECONET® code key

The ECONET® coils' order code is obtained from theunit selection software.

EURT-aa-b-c-d-e-ff-g-h-i

Unit size (aa)20 = EU size 2022 = EU size 2230 = EU size. 30etc.

Finned heat exchanger (b)2= Supply air, heat exchanger 3= Supply air, heat exchanger with droplet separator, plastic5= Exhaust air, heat exchanger 6= Exhaust air, heat exchanger with droplet separator,plastic

Output variant (c)1 = 12 = 23 = 34 = 4 5 = 5

Coil version (d)1 = Normal face area, casing galvanized steel3 = Normal face area, casing in stainless or polyester coated steel2 = Max. face area, extension frame in galvanized sheetsteel5 = Max. face area, extension frame in stainless steel 7 = Max. face area, extension frame in polyester coatedsteel

Fin spacing (e)1 = 2 mm2 = 2.5 mm4 = 4 mm5 = 5 mm

Circuit ( FF )From product selection software

Material, coil (g)1 = Cu/Al 2 = Cu / Cu 3 = Cu / Cu tinned 4 = Cu/Al CP (Corropaint) 5 = Cu/Al copper header 7 = Cu/Al hygiene fins 8 = Cu/Cu hygiene fins 9 = Cu/Al copper header, hygiene fins

Material, coil frame (h)1 = Galvanized steel2 = Stainless steel

Connection side ( i )1 = Right2 = Left

Commissioning by ECONET® is included in the delivery, ordered via Fläkt Woods sales offices, codeaccording to

Commissioning code for ECONET®: SERV-07-1/2 (b position varies)

The type of service (b)1 = Commissioning2 = Participate at inspection3 = Rebuilding

Fläkt Woods



GUIDE

The ECONET® pump unit's order code is obtained fromthe unit selection software.

STYZ-74-bb-c-d-e-f-g-h-i-j-k-l

Unit size (bb)20 = EU size 2022 = EU size 22etc.

Pump choice, (c)1 = Single pump2 = Double pump

Efficiency calculation etz. (d)0= Without1 = Energy calculation2 = Efficiency and energy calculation

Communication (e)0 = Without 3 = Lon 4 = N2 7 = Modbus, RTU 8 = BACnet9 = Web pages

Electricity connection (f)6 = Plug & Play7 = Standard

Rated Voltage and Protection Class (g)1 = 3 x 400 V IP212 = 3 x 400 V IP54

Output variant EURT (h) 2= 23 = 34 = 45 = 5

Bracket/Stand (i)0 = Without1 = With

Language (j) 1= Swedish2 = German3 = English4 = Finnish

Construction version (k) 1 = ECONET II (FX-05 controller) 2 = ECONET III (Saphir controller)

Connection side of coil (l) 1= Right, standard2 = Left, standard3 = Right, stainless steel4 = Left, stainless steel5 = None6 = none, stainless steel

The ECONET® exchanger package's order code isobtained from the unit selection software.

EURZ-05-bb-c-dd-eeee-ff-ggg-h-i

Unit size (bb) 20 = EU size 20 22 = EU size 22 etz.

Exchanger selection (c)1 = Heat exchanger2 = Cooling exchanger3 = Heat and cooling exchanger

Size of heat exchanger (dd)Number of plates heat exchanger (eee)

Size of cooling exchanger (ff)Number of plates cooling exchanger (ggg)

Type of pipe work (h) 1 = Standard2 = Stainless steel

Construction version (i) 1= version 2006.12

ECONET® code key

Fläkt Woods Group Brings Air to Life

Fläkt Woods Group provides a full range of products and solutionsfor building ventilation, air treatment and industrial air movement.

ECON

ET -

Hea

ting

& C

oolin

g tr

ansf

er-G

B-2

00705-8

024

CC

J

Sales Offices available World Wide – See our website for details.

www.flaktwoods.com

Head offices

Buildings Air Climate

Fläkt Woods ABKung Hans väg 12SE-192 68 SOLLENTUNASwedent +46 771 26 26 26f +46 8 626 73 10

Industry Air Movement

Fläkt Woods LimitedTufnell WayCOLCHESTER, CO4 5ARUnited Kingdomt +(0) 1206 544122f +(0) 1206 574434

Due to a policy of continuous development and improvement theright is reserved to supply products which may differ from thoseillustrated and described in this publication. Certified dimensionswill be supplied on request on receipt of order.

Documents

Econet Heating And Cooling Transfer 2007 06 8024 Gb