Commercial Water Heater System Installation Manual · Commercial Water Heater System Installation Manual ... Installation of Gas Supply ... Cold Water Manifold Pipe Material Copper

1 CWHS-IMC199 Rev. 03/16

Commercial Water Heater System Installation Manual

-Additional information can be obtained from the appliance manual.

Floor Mount Rack (D.V Units) 6 Water Heaters

Floor Mount Rack (O.D Units) 4 Water Heaters


Table of Contents

Table of Contents ................................................................................................................................................................... 2

Safety Symbols ....................................................................................................................................................................... 3

Description.............................................................................................................................................................................. 5

Venting For D.V & Concentric Units (VK-3) ........................................................................................................................... 6

Commercial Water Heater System Parts Number & Main Components ........................................................................... 13

2 Unit Wall Mount Frame Spec ............................................................................................................................................ 15

2 Unit Drawing Illustration / Dimensions ............................................................................................................................ 16

3 Unit Wall Mount Frame Specifications ............................................................................................................................. 17


4 Unit Floor Mount Frame Specifications (4, 3, 2 Possible Configuration) ........................................................................ 19


6 Unit Floor Mount Frame Specifications (6, 5, 3 Possible Configuration) ........................................................................ 21


Clearances ............................................................................................................................................................................. 23

Hoisting and Lifting Lugs ...................................................................................................................................................... 26

Securing Commercial Water Heater System Floor Mount .................................................................................................. 27

Securing Commercial Water Heater System Wall Mount ................................................................................................... 28

Relief Valve Piping ................................................................................................................................................................ 29

Freeze Prevention / Insulation ............................................................................................................................................ 30

Rack Parallel Piping System ................................................................................................................................................. 30

End Caps Drawing Connections ........................................................................................................................................... 32

Condensate Drain to Floor or with Pump ............................................................................................................................ 33

Water Treatment .................................................................................................................................................................. 35

Checklist for plumbing ......................................................................................................................................................... 36

Installation of Gas Supply .................................................................................................................................................... 37

Electrical wiring .................................................................................................................................................................... 39

Remote Controller ................................................................................................................................................................ 40

Multi System Controller ....................................................................................................................................................... 41

Final checklist ....................................................................................................................................................................... 44

Trial Operation ..................................................................................................................................................................... 47

Replacement Parts Reference Numbers .............................................................................................................................. 49

Warranty for Tankless Unit & Commercial Water Hearter System Components .............................................................. 50


Safety Symbols


Installation

A licensed professional must install the Commercial Water Heater System.

Installer should have skills such as connecting gas line, water line, electricity, and knowledge to

applicable national state and local codes.

Do not continue you if lack in the following skills above. Contact a licensed professional.


Description

Noritz Commercial Water Heater System is a pre-fabricated racking system that can be used in flat rooftop or

mechanical room applications for commercial multi-systems. Available in either wall mount or floor mount

configurations. For the wall mounted configurations, the Commercial Water Heater System are available for 2

or 3 Noritz tankless water heaters. For the floor mount option, the Commercial Water Heater System are

available for 2, 3, 4, 5, or 6 Noritz tankless water heater.

The Commercial Water Heater System provides a time and labor saving solution when installing multiple

Noritz tankless water heaters.

Manufactured with highly corrosion-resistant aluminum that can withstand extreme environments.

Both wall and floor mount design are available for easy labor installations for both the indoor and

outdoor unit types.

All gas, water supplies, and condensate drain are properly pre-sized for optimum performance.

Remote controller and system controller are pre-installed for monitoring and controlling up to 6 units.


Venting For D.V & Concentric Units (VK-3)

Venting Option Chart

Venting Options Exhaust Vent

Material Intake Vent

Material Diameter

Maximum Vent Length

(Not including the

termination)

Direct Vent (D.V) Schedule 40 PVC or schedule 40 or

80 CPVC

Schedule 40 PVC or schedule 40 or

80 CPVC

4" 57'

3" 28'

Using Concentric PVC/CPVC

Termination (VK-3-H-PVC)


80 CPVC


80 CPVC

4" 42'

3" 28'

Refer below for specific details regarding each different type of vent installation.

Maximum vent length adjustment dipswitches may need to be adjusted to accommodate vent runs.

Refer to Installation Manual Page 13 for additional details.

For additional installation procedures, Noritz recommend to read the Installation Manual or contact

Noritz technical support.


Horizontal Individual Vent Termination –PVC/CPVC Materials Only

Follow the requirement illustrated below.

Slope the horizontal vent 1/4" upwards for every 12" (300mm) toward the termination.

Use a condensation drain if necessary.

Intake and exhaust should face the same direction and be at the same pressure zone.

Make sure to insert the bird screen into the 90° elbow vertical setting (downward).

In the Commonwealth of Massachusetts a carbon monoxide detector is required for all side wall

horizontally vented gas fuel equipment.

For additional information on installation procedures, please refer to Installation Manual (pg. 15, 17) or

contact Noritz.

* If you decide to install combustion air intake from the indoors, please refer to

Installation Manual procedures and clearances (pg. 18-19).

Side View

Side View Interior View

Interior View Exterior View

Exterior View

≥ 3 in MIN For both Exhaust & Intake

Exhaust

Intake

Exhaust

Exhaust

Intake

Intake

Exhaust Exhaust Exhaust

Intake Intake Intake

≥ 3 in MIN For both Exhaust & Intake


Vertical Individual Vent Termination –PVC/CPVC Materials Only

As illustrated below, make sure to keep a distance of 3’ (0.9m) or wider between the intake and

exhaust when installing the vent piping.

Provide vertical support every 3' (0.9m) or as required by the vent pipe manufacturer's instructions.

When using a horizontal section, slope the horizontal vent 1/4” upwards for every 12” (300mm)

toward the termination to drain condensate.

For additional information on proper installation procedures, please refer to Installation Manual (pg.

15) or contact Noritz.

* If you decide to install combustion air intake from the indoors, please refer to Installation Manual

procedures and clearances (pg. 18-19).

Exhaust

≥3 ft MIN

≥ 1 ft MIN

Multiple Vent Terminations

Isometric View of a Building Roof

Intake

≥3 ft MIN

≥3 ft MIN

Intake

Intake

Exhaust

Exhaust

≥ 1 ft MIN



Horizontonal Concentric (Using VK3-H-PVC)

If installing with the VK3-H-PVC, refer to the illustrations below. Multiple units must follow 12” or more

clearances. For additional and more detailed installtion procedues and maximum vent length dip

switches adjustment (pg. 13 Installation Manual), refer to the the VK3-H-PVC (PVC Concentric Vent)

Installation Manual.

The pipe shall be installed so that the first 3’ of pipe from the appliance flue outlet is readily accessible

for visual inspection.

When using 4" (100mm) pipe, it is necessary to use 4" (100mm) x 3" (75mm) reducing couplings and a

short section of 3" (75mm) pipe to connect to the termination. Slope the horizontal vent 1/4" upwards

for every 12" (300mm).

Use a condensation drain if necessary.


Vertical Concentric (Using VK3-H-PVC with Vertical Adapter Set)

If installing vertical terminal using the VK3-H-PVC, a vertical adapter set for 3” PVC concentric

termination is needed. *Not approved for Cananda.

Maintain 12 in minimum clearance above highest anticipated snow level, maximum of 24 in. above

roof.

Follow the illustrations below for separation between multiple vertical terminations. For installation

and additional information procedures, please refer to VK3-H-PVC with Vertical Adapter Set Installation

Manual.

For terminations at un-equal heights, maintain 24 inches minimum clearance.

12” or more 12” or more

Vent Terminals


For terminations at equal heights, maintain 24 inches minimum clearance.

* For maximum vent length and reduced input configurations dipswitch adjustment, please refer to (pg. 13

Installation Manual and pg. 16 using termination VK3-H-PVC Installation manual).


Commercial Water Heater System Parts Number & Main Components

Commercial Water Heater System Wall Mount Model

Number Rack Type Configuration Illustration

CWHS101 2 Unit O.D Wall Mount Rack, LP

CWHS201 2 Unit O.D Wall Mount Rack, NG

CWHS301 2 Unit D.V Wall Mount Rack, LP

CWHS401 2 Unit D.V Wall Mount Rack, NG

CWHS102 3 Unit O.D Wall Mount Rack, LP

CWHS202 3 Unit O.D Wall Mount Rack, NG

CWHS302 3 Unit D.V Wall Mount Rack, LP

CWHS402 3 Unit D.V Wall Mount Rack, NG

NOTE:

*The illustrations for the Commercial Water Heater System in this manual will show condensate neutralizer

(Noritz Part# NT-20A). However, the neutralizer is only in the drawing because it is recommended, and to

show where it would fit in the multi-rack system; the neutralizer is NOT included in the Commercial Water

Heater System package. If using the condensate neutralizer, please refer to page 33 of manual for proper

piping.

Neutralizer


Commercial Water Heater System Floor Mount Model Number Rack Type Configuration Illustration

CWHS103 2 Unit Back to Back O.D Floor Mount, LP

CWHS203 2 Unit Back to Back O.D Floor Mount, NG

CWHS303 2 Unit Back to Back D.V Floor Mount, LP

CWHS403 2 Unit Back to Back D.V Floor Mount, NG

CWHS104 2 Unit O.D Floor Mount, LP

CWHS204 2 Unit O.D Floor Mount, NG

CWHS304 2 Unit D.V Floor Mount, LP

CWHS404 2 Unit D.V Floor Mount, NG






















2 Unit Wall Mount Frame Specifications

BTU and Flow Rates for NCC199DV (GQ-C3257WZ-FF U.S) NCC199OD (GQ-C3257WZ U.S)

Number of Tankless Water Heaters 2

Max. Hot Water Capacity @ 30°F rise (GPM) 22.2


Minimum (Btuh) 16,000

Maximum (Btuh) 399,800

Model and Rack Specifications

Model Number CWHS101, (201), (301), (401)

Tankless Water Heater Model NCC199DV, NCC199OD (NG/LP)

Rack Dimensions (in) 43 (L) x 2(W) x 65 (H)

Weight -Fully Assembled (lbs) 203

Weight -Fully Assembled + Shipping (lbs) 324

Frame Material Aluminum

Color Gray

Water & Gas Pipe Connections

Hot Water Manifold Pipe Material Copper

Cold Water Manifold Pipe Material Copper

Gas Manifold Pipe Material Black Iron

Condensate Drain Manifold Pipe Material Schedule 40 PVC

Hot Water Manifold Pipe Diameter (in) 2

Cold Water Manifold Pipe Diameter (in) 2

Gas Manifold Pipe Diameter (in) 1 - 1/4

Condensate Drain Manifold Pipe Diameter (in) 1

Electrical Requirements

Voltage 120VAC (60 Hz)

Maximum Current (Amps) 8


2 Unit Drawing Illustration / Dimensions

*All Units are in inches

<Front> <Right>

<Bottom>

>


3 Unit Wall Mount Frame Specifications


Number of Tankless Water Heaters 3



Minimum (Btuh) 16,000

Maximum (Btuh) 599,700


Model Number CWHS102, (202), (302), (402)



Weight -Fully Assembled (lbs) 301

Weight -Fully Assembled + Shipping (lbs) 443


Color Gray












Maximum Current (Amps) 12




<Front> <Right>

<Bottom>

>


4 Unit Floor Mount Frame Specifications (4, 3, 2 Possible Configuration)


Number of Tankless Water Heaters 4 3 2

Max. Hot Water Capacity @ 30°F rise (GPM) 44.4 33.3 22.2


Minimum (Btuh) 16,000 16,000 16,000

Maximum (Btuh) 799,600 599,700 399,800


Model Number

CWHS106, (206), (306),

(406)

CWHS105, (205), (305),

(405)

CWHS103, (203), (303), (403), (104), (204), (304), (404)



Weight -Fully Assembled (lbs) 420 341 262

Weight -Fully Assembled + Shipping (lbs) 549 480 391


Color Gray












Maximum Current (Amps) 16 12 8

<4 Units Back to Back> <3 Units Back to Back> <2 Units in Line> <2 Units Back to Back>




<Front> <Right>

<Bottom>

>


6 Unit Floor Mount Frame Specifications (6, 5, 3 Possible Configuration)

BTU and Flow Rates for NCC199DV(GQ-C3257WZ-FF U.S) NCC199OD(GQ-C3257WZ U.S)

Number of Tankless Water Heaters 6 5 3



Minimum (Btuh) 16,000 16,000 16,000

Maximum (Btuh) 1,199,400 999,500 599,700


Model Number

CWHS109, (209), (309),

(409)

CWHS108, (208), (308),

(408)

CWHS107, (207), (307),

(407)


Rack Dimensions (in) 70 (L) x 29 (W) x 65 (H)

Weight -Fully Assembled (lbs) 598 519 352

Weight -Fully Assembled + Shipping (lbs) 746 667 500


Color Gray






Hot Water Manifold Pipe Diameter (in) 2 – 1/2"

Cold Water Manifold Pipe Diameter (in) 2 – 1/2"

Gas Manifold Pipe Diameter (in) 2"

Condensate Drain Manifold Pipe Diameter(in) 1"



Maximum Current (Amps) 24 20 12

<6 Unit Back to Back> <5 Unit Back to Back> <3 Unit Back to Back>




<Front>

<Bottom>

<Right>


Clearances

Install the rack system so that the clearances shown below are followed.

Clearance Requirements for Both Combustibles and Non-Combustibles

NCC199DV Inches (mm) NCC199OD Inches (mm)

Top of Heater 12" (300mm) 36" (900mm)

Left Side of Heater 2" (50mm) 6" (150mm)

Right Side of Heater 2" (50mm) 6" (150mm)

Front of Heater 24" (600mm) 24" (600mm)

Vent Pipe 0" (0mm) N/A

• Please see illustration below.

For additional clearances information, please refer to the Installation Manual (Pg. 7).

NCC199OD NCC199DV


For direct and non-direct vent clearance requirements, please refer to the chart below.


* The clearance requirements from vent terminations to building openings chart above apply to O.D and S.V

converted units.


Hoisting and Lifting Lugs

• The Water Heater System Floor Mounts models are available with lifting lugs for hoisting, lifting and

moving. The hoisting cable lines to the lugs should be angled at a 90°. It is recommended to use a

spreader lifting bar for safety precaution. For weights of the heaters and racks, please refer to the

specification section of this manual.

• Caution: Do not hoist the pallet or crate.

Refer to the diagram below for all the possible hoisting models.

CWHS103,

(203),

(303), (403)

CWHS105,

(205),

(305), (406)

CWHS106,

(206),

(306), (406)

CWHS107, (207),

(307), (407)

CWHS108, (208),

(308), (408)

CWHS109, (209),

(309), 409)

CWHS104,

(204),

(304), (404)

Lifting Lugs


Securing Commercial Water Heater System Floor Mount

All mechanical components shall be anchored and installed in accordance with national and local codes

including anchorage to building structures.

To secure all floor mount models, the base holes are 0.54 inches in diameter.

For minimum concrete thickness, please reference local codes or consult with a licensed structural

engineer regarding and the use of appropriate expansion anchors that is capable of supporting the

Commercial Water Heater System weight. The fully assembled weight are available in the

specifications section under each model number.

Refer to the diagram below for all the possible floor mount models.

CWHS103,

(203),

(303), (403)

CWHS104,

(204),

(304), (404)

CWHS105,

(205),

(305), (406)

CWHS106,

(206),

(306), (406)

CWHS107, (207),

(307), (407)

CWHS108, (208),

(308), (408)

CWHS109, (209),

(309), 409)


Securing Commercial Water Heater System Wall Mount

When mounting the Commercial Water Heater System to the wall, please make sure the wall is

capable of carrying the fully assembled weight to the specified model number. * The fully assembled

weight are available in the specifications section under each model number.

Make sure to consult a structural engineer for appropriate methods or structural analysis before

attempting to wall mount the fully assembled Commercial Water Heater System.

Failure to comply with the above requirements could result in substantial property damage, personal

injuries or death.

Identify the installation location and confirm that the installation will meet all required clearances.

The base holes are for anchors installed in stone or aggregate concrete only. For other anchorage

details, a contractor or engineer for the building shall consult with a licensed structural engineer for all

anchorage of equipment not called out in the Commercial Water Heater System Manual.

For minimum concrete thickness, please reference local codes or consult with a licensed structural

engineer regarding and the use of appropriate expansion anchors that is capable of supporting the

Commercial Water Heater System weight.

To secure all wall mount Commercial Water Heater System models, the base holes are 0.54 inches in

diameter. Confirm the use of approved floor anchors.

Secure the Commercial Water Heater System to the wall and ensure it is capable of supporting it.

Commercial Water Heater System Wall Mount Models

CWHS101,

(201), (301),

(401)

CWHS102,

(202), (302),

(402)


Relief Valve Piping

• Installation and service must be performed by a qualified plumber. In the Commonwealth of Massachusetts, this product must be installed by a licensed plumber or gas fitter in accordance with the Massachusetts Plumbing and Fuel Gas Code 248 CMR Sections 2.00 and 5.00. Observe all applicable codes.

• Each Noritz tankless water heater on the Commercial Water Heater System comes installed with an

isolation valve and a pressure relief valve on the hot water outlet side.

• The pressure relief valve must be operated once a year to ensure that it is functioning properly and

there is no obstruction. Turn the power off to the unit before opening the relief valve, and make sure

that water draining out of the valve will not cause any damage.

• If the relief valve discharges periodically, it may be due to thermal expansion in a closed water system.

Contact the water supplier or a local plumbing inspector on how to correct this situation. Do not plug

the relief valve

• The relief valve must be installed such that the discharge will be conducted to a suitable place for

disposal when relief occurs.

• Refer to installation manual for more information and proper piping for the relief valve drain.

Pressure Relief Valve

Isolation Valve with Safety Relief Kit

Discharge Location


Freeze Prevention / Insulation

• If DV model is installed in an area where the outside temperature can approach freezing conditions of

-30°F (-35°C) and OD model -4°F (-20°C) or below, then additional protection measures must be used.

For temporary freeze protection measure, refer to the Owner’s Guide.

• The freeze prevention heaters will not prevent the plumbing external to the unit from freezing. Protect

this plumbing with insulation, heat tape or electric heaters, solenoids, or pipe covers.

• In order for the freeze prevention heaters to operate the water heater must have power at all times.

• Freezing cannot be prevented when the power plug is unplugged. Do not remove the power plug from

the wall outlet.

• In normal operation, freezing is prevented within the device automatically unless the outside

temperature without wind is below -30°F (-35°C) for NCC199DV or -4°F (-20°C) for NCC199OD.

• When supplying combustion air from the indoors, the room temperature must be greater than 32°F

(0°C) to prevent freezing and the room inside must not have negative pressure.

• Insulate or apply heating materials to both the cold water and the hot water supply piping to prevent

freezing during cold weather and to prevent heat loss through the piping.

Rack Parallel Piping System

• Noritz Commercial Water Heater System should be installed in parallel using secondary manifolds from the

building cold, hot and gas supply if plumbing multiple racks. Reference the drawing below for guidance on

plumbing.

• A low pressure gas regulator must be installed prior to the rack system so that the following gas pressure for

each unit are within the gas supply pressure. See chart in instllation of gas supply section for gas supply pressure

range details.

• Use common plumbing practice and reference all applicable codes when sizing the secondary manifolds and gas

regulator. If in doubt about the size of the secondary manifolds, refer to an approved sizing chart or contact

Noritz for any additional questions.



End Caps Drawing Connections

Each end caps are field supplied and to be the following materials:

Cold water line cap - Copper

Hot water line cap - Copper

Gas line cap - Black iron

• Once flow directions and gas supply is determined, the opposite side of the supplied manifold must be

capped and checked for leaks.

• See diagram below.

CAP

CAP

CAP

HOT OUT

GAS IN

COLD IN

<Back>

* If using the commerical neutarlizer (NT-20A) accessory, materials (field supplied) for piping are required. See page. 33 for more information.


Condensate Drain to Floor or with Pump

• Each Noritz tankless water heater unit comes with a pre-piped condensate drain outlet on the bottom

of the unit which must be properly drained in order to ensure proper operation of this appliance.

• The pH level of the condensate is approximately 2-3. An external neutralizer must be installed on the

drain piping prior to disposal when required by local code or when the condensate could cause

damage. Below are options to properly drain the condensate outlet.

Piping to floor drain ( must maitain clearance (air gap) to floor drain).

For long runs or the drain is above the water heater, a condensate pump is recommend (field

supplied). Size the pump to allow for a maximum condensate discharge of 2 GPH/unit (Ex. 6 units =

12GPH) from the water heater.

NT-20A commerical condenstate neutralizer kit accessory

(conntect up to maximum of fifteen (15) condensing water heaters in a multi system).

If using this accessory, materials (field supplied) for piping are required. The NT-20A will need to be

piped to a a floor drain. For long runs or drain above the water heater, a condensate pump is needed,

followed by pipes to the floor drain. Refer to NT-20A for proper installation.

• The end of the drain pipe must not be submerged in water or blocked in any way. To ensure proper

drainage, leave the end of the drain pipe open to the atmosphere. Also, make sure that there are no

obstructions blocking the drain line from discharging condensate outlet.

• Be sure to check that condensate is freely flowing from the drain piping after the system has been

installed. Condensate will begin flowing out of the water heater within 15-20 minutes after operation

has started.

• If the drain line becomes clogged or frozen, condensate water will flow back into the water heater and

a "29" error code will flash on the remote controller, stopping the tankless water heater operation. If

this occurs, clear the clogging or frozen water so that condensate can freely flow again. Apply freeze

prevention measures (when necessary) to prevent the drain line from clogging or freezing.


• Take measures to prevent the condensate drain lines from freezing (insulation, heat tape, electric

heaters, etc.) as illustrated below.

• After the water heater has been out of use for a long time make sure that you fill the condensate trap

with water. This is to prevent dangerous exhaust gases from entering the building. Failure to fill the

condensate trap could result in severe personal injury or death.

* Do not use the condensate water, discharged from the drain pipe, for drinking purposes.

Filling the Condensate Trap with Water for DV Model Only


Water Treatment


Checklist for plumbing

Read the Manual thoroughly prior to installation.

Check that the rating plate indicated the correct gas type. (Natural Gas or Propane)

If units are being installed at an elevation of 2000 ft. (610 m) or higher, a dip switch inside the unit

need to be adjusted. Please refer to the water heater Installation Manual for instructions on making

this adjustment.

Gas Piping

Do not reduce and use a smaller diameter than the Commercial Water Heater System gas inlet

diameter.

Install a gas shutoff valve on the supply line.

Verify the inlet gas pressure is within range. Refer to (Page. 38)

Water Piping

Check the inlet water pressure to the water heater. Noritz recommend 207 to 491 kPa (30 - 70 psi) in

order for client to use the water heater comfortably.

Install a check valve and a shut off valve near the incoming Commercial Water Heater System water

inlet.

Confirm that the hot and cold water lines are not crossed to the unit and are leak free.

Debris in the cold water inlet will damage Noritz water heater. Purge the cold water inlet of all debris

and air by closing the hot water isolation valve and opening the cold isolation valve and its drain. Use a

bucket to catch the water or hose to avoid getting wet.

Confirm that a pressure relief valve piping is installed. See manual for proper installation.

Confirm any issues regarding water quality have been addressed or treated.


Installation of Gas Supply

1. A licensed professional must install the gas supply.

2. Turn off and unplug the 120v power supply.

3. Turn off the gas and do not smoke or have other ignition sources while working on the gas.

4. Do not turn on Noritz tankless water heater or gas line until all fumes are gone.

5. Check the rating plate for correct gas type and gas inlet pressure before connecting to the water heater.

6. Before operating, all gas piping should be checked and tested by a leak detector or an equivalent

nonflammable solution.

7. Purge the gas line of any debris before connecting to the water heater.

8. Do not reduce and use a smaller diameter than the Commercial Water Heater System gas inlet diameter.

9. To check for gas pressure setting and measuring gas pressure of the system please refer to the diagram

below.



Electrical wiring The units on the Commercial Water Heater System are not electrical pre-wired. Each water heater requires

120VAC, 60Hz power from a properly grounded circuit. A wiring diagram is provided below for proper

grounding of the unit. For more additional information please refer to Installation Manual and consult a

qualified electrician for the electrical work.

If using a power cord, plug it into a standard 3 prong 120VAC 60Hz properly grounded wall outlet.

If using a disconnect switch, it must be installed for the incoming 120VAC power. It should be a type

suitable for outdoor use. Check your local codes for a proper switch type to use in your area.

For breaker installation, please refer to the breaker section below.


Remote Controller

The Commercial Water Heater System comes with a pre-installed remote controller.

Only one remote controller is connected to the Noritz tankless water heater to monitor and control all

the units. If two or more remote controllers are connected a malfunction will occur.

When power is first connected to the Multi - Unit system (system controller and units,) the remote

enters an intial setting mode.

You will be prompted to choose between a system type (Standard, Recirc., or Tank Recirc.).

If “Recirc” is selected, properly set the recirculation system operation timer

(Ex. 5:00am – 8:00am).

Refer to the RC -9018M (Remote Controller) Installation Manual for additional information such as

system clock button (pg. 8), setting hot water temperature (pg. 10), locking (pg. 14), additional settings

(pg. 15), and disabling recirculation operation (pg. 18).

For other additional information, please refer to (SC-301-6M) Installation Manual for information such

as remote initial setup (pg. 9), recirculation pump timer setup (pg. 13), system check button (pg. 15),

maintenace montiors and additional settings (pg. 16).

* The remote controller is not resistant to water, steam, chemcials, or UV rays. Please keep it stored in a

location where it will not be exposed to these conditions.


Multi System Controller

The Commercial Water Heater System comes preinstalled with a system controller for up to 6 units

(SC-301-6M).

All of the Noritz tankless water heaters should be electronically connected with the multi system

controller.



The system controller is installed inside one of the unit, located on the front (manifold side) and

furthest to the left. It should be located and secured at the master unit illustrated like the diagram

below.

Please refer to the system controller installation manual SC-301-6M (6 Unit System Controller) for

other additional multi system controller features such as warning and operation light pg. 20, circulation

pumps pg. 21, exhaust fan, pressure switch pg. 22, and thermostat pg. 23.

The system controller will always be installed in the unit #1 which is the most left side unit from the

front view.


Final checklist

Before Installation

Check that the rating plate indicated the correct gas type. (Natural Gas or Propane)

If units are being installed at an elevation of 2000 ft. (610 m) or higher, a dip switch inside the unit

need to be adjusted. Please refer to the water heater Installation Manual for instructions on making

this adjustment.

Venting

Use only PVC or CPVC vent materials.

Clearance from unit to unit have been met.

Maintain clearance to combustibles as required to manual.

Avoid installing elbow directly on top of unit.

Horizontal Vent Termination

Slope the horizontal vent ¼” upward every 12” toward termination. Use a condensation drain tee if

necessary.

Vertical Vent Termination

Confirm clearances from the vent termination / air intake are met to manual.

Gas Piping

Do not reduce and use a smaller diameter than the Commercial Water Heater System gas inlet

diameter.

Install a gas shutoff valve on the supply line and check connections for leaks.

Confirm the gas inlet pressure is within range and is rated for the gas type.

Water Piping

Check the inlet water pressure to the water heater. Noritz recommend 207 to 491 kPa (30- 70 psi) in

order for client to use the water heater comfortably.

Install a check valve and a shut off valve near the water inlet for easy access / future maintenance.

Confirm that the hot and cold water lines are plumbed correctly and not crossed to the unit.

Verify all the end caps are capped and all the plumbing are leak free.


Debris in the water line will damage Noritz water heater. Purge the cold water line of all debris and air

by closing the hot isolation valve and opening the cold isolation valve and its drain. Use a bucket to

catch the water or hose to avoid getting wet.

Confirm that a pressure relief valve piping is installed. See manual for proper installation.

Confirm that the water supply line does not contain chemicals and any issues regarding water quality

have been addressed or treated.

If the water heaters are not needed for immediate use then drain the water from the heat exchanger

by following the procedure in Owners Guide pg. 33. Use a bucket to catch the water or hose to avoid

getting wet.

Verify if the insulation for cold water inlet and hot water outlet are installed. Inform the client if they

are not installed.

Verify if the thermal expansion tank is installed in the cold water line and sized correctly. For sizing

help, please contact Noritz.

Condensate Drains

For additional piping, do not use steel, black iron, copper or any other material that can corrode the

pipe. Use plastic pipe, such as PVC.

Leave the end of the drain pipe open to the atmosphere. Do not add a trap. Also make sure there are

no obstructions blocking the drain line.

Confirm the condensate trap is filled with approx. 30 oz. (850ml) of water inside the exhaust.

Take measure to prevent the condensate drains from freezing. Use insulation, heat tape, electric

heaters, etc.

Electrical Wiring

Confirm the electricity is supplied from a 120V AC. at 60Hz power source.

Confirm it is properly grounded.

After Installation

Install the remote control inside a dry area. It is not water, chemical and UV ray proof.

Explain to the client the importance of not blocking the vent termination or air intake.

Open a hot water fixture and confirm there is a blue flame in the burner window and hot water is

being produced at all fixtures.

Using the remote controller, check the flow rate for any problems.


Clean the filter in the cold water inlet and instruct cilent the process.

Install the front panel and explain to the client the operation of the water heater, safety guidelines,

maintenance, and warranty.

If relief valve piping or water treatment is not installed, inform the client.

Leave the entire manual taped to the water heater (indoor models) or give them directly to the client.

If the water heater does not function properly, call Noritz for assistance.

*This checklist is not a replacement for thoroughly reading all the Commercial Water Heater System manual

literature.


Trial Operation

The installer should test operate the unit, followed by explaining to the customer how to use the unit, and give

the owner this manual before leaving the installation site.

Preparation steps.

1. Confirm the condensate trap is filled with approx. 30 oz. (850ml) of water inside the exhaust for DV model

only.

2. Open a hot water fixture to confirm that water is available, and then close the fixture.

3. Open the gas supply valve.

4. Turn on the power supply. Using the remote controller, turn on the Power On / Off button (the Operation

lamp will turn on).

Operation steps.

1. Open a hot water fixture and confirm that the Burner On lamp on the remote controller lights on, and that

hot water is being produced. (If necessary, repeat until the air in the gas piping is bled out).

* White smoke may produce from the exhaust vent during cold weather. This is not a malfunction of the unit.

* If an “11” error code appears on the remote controller, turn the unit off and then on 2 - 3 times. Followed by

opening the hot water fixture again.

2. Change the temperature setting on the remote controller and check whether the water temperature

changes.

• Check to see that the hot water temperature is the same as the temperature displayed on the remote

controller. If multiple units do not ignite, switch which unit will ignite first by pressing the Max. or Min.

Manifold Pressure Set Button on the circuit board.

Pressing the Max. or Min. Manifold Pressure

Set Button on Unit 2 or 3, etc.

Unit 1 Ignites

Unit 2 Doesn’t Ignite

Unit 3 Doesn’t ignite (unless

more water is being

demanded)

…….


more water is being

demanded)

Unit 1 Doesn’t Ignite

Unit 2 Ignites


more water is being

demanded)

…….


more water is being

demanded)


• If the water heater does not operate normally, refer to “Troubleshooting” in the Operation Manual. After

the trial operation, clean the filter in the cold water inlet.

• Use the remote controller to see the status of how many units are igniting.

Shutdown Steps.

1. Stop any water demand

2. Turn off electrical power.

3. Drain the water out of each unit to prevent freezing.

4. Clean the filter in the cold water inlet and instruct cilent the process.


Replacement Parts Reference Numbers

No. Description

1 Gas Flex Line

2 Gas Valve

3 Hot Water Flex Line

4 Cold Water Flex Line

5 Cush Clamp for 1” Condensate Drain Pipe

6 Cush Clamp for 1-1/4” Gas Pipe

7 Cush Clamp for 2” Water Pipe

8 Cush Clamp for 2.5” Water Pipe

9 Corner Brace

10 Four Hole Corner

11 Corner Gussets

12 Aluminum Plate (for 2-4 units length)

13 Aluminum Plate (for 3-6 units length)

14 Water Manifold, 4 unit back to back

15 Water Manifold, 6 unit back to back

16 Water Manifold, 2 unit wall mount

17 Water Manifold, 3 unit wall mount

18 Gas Manifold, 4 unit back to back

19 Gas Manifold, 6 unit back to back

20 Gas Manifold, 2 unit wall mount

21 Gas Manifold, 3 unit wall mount

22 Dirt Leg Assembly 1

2

3

4

5/6/7/8

9

10

11

12/13

14/15/16/17

18/19/20/21

1

2

3

4

5/6/7/8

9

10

11

12/13 14/15/16/17

18/19/20/21

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22

22


Warranty for Tankless Units & Commercial Water Heater System Components Warranty Registration Required *

Warranty Period

Period of Coverage (Date of Installation or 30 Days After Purchase)

Labor Parts Heat Exchanger

Tankless Water Heater 1 year 5 years 3 years

Commercial Water Heater System Rack 1 year




Documents

Commercial Water Heater System Installation Manual · Commercial Water Heater System Installation Manual ... Installation of Gas Supply ... Cold Water Manifold Pipe Material Copper