Post on 20-Apr-2020
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
2 CWHS-IMC199 Rev. 03/16
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
3 Unit Drawing Illustration / Dimensions ............................................................................................................................ 18
4 Unit Floor Mount Frame Specifications (4, 3, 2 Possible Configuration) ........................................................................ 19
4 Unit Drawing Illustration / Dimensions ............................................................................................................................ 20
6 Unit Floor Mount Frame Specifications (6, 5, 3 Possible Configuration) ........................................................................ 21
6 Unit Drawing Illustration / Dimensions ............................................................................................................................ 22
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
3 CWHS-IMC199 Rev. 03/16
Safety Symbols
4 CWHS-IMC199 Rev. 03/16
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.
5 CWHS-IMC199 Rev. 03/16
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.
6 CWHS-IMC199 Rev. 03/16
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)
Schedule 40 PVC or schedule 40 or
80 CPVC
Schedule 40 PVC or schedule 40 or
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.
7 CWHS-IMC199 Rev. 03/16
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
8 CWHS-IMC199 Rev. 03/16
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
9 CWHS-IMC199 Rev. 03/16
10 CWHS-IMC199 Rev. 03/16
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.
11 CWHS-IMC199 Rev. 03/16
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
12 CWHS-IMC199 Rev. 03/16
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).
13 CWHS-IMC199 Rev. 03/16
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
14 CWHS-IMC199 Rev. 03/16
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
CWHS105 3 Unit O.D Floor Mount, LP
CWHS205 3 Unit O.D Floor Mount, NG
CWHS305 3 Unit D.V Floor Mount, LP
CWHS405 3 Unit D.V Floor Mount, NG
CWHS106 4 Unit O.D Floor Mount, LP
CWHS206 4 Unit O.D Floor Mount, NG
CWHS306 4 Unit D.V Floor Mount, LP
CWHS406 4 Unit D.V Floor Mount, NG
CWHS107 3 Unit O.D Floor Mount, LP
CWHS207 3 Unit O.D Floor Mount, NG
CWHS307 3 Unit D.V Floor Mount, LP
CWHS407 3 Unit D.V Floor Mount, NG
CWHS108 5 Unit O.D Floor Mount, LP
CWHS208 5 Unit O.D Floor Mount, NG
CWHS308 5 Unit D.V Floor Mount, LP
CWHS408 5 Unit D.V Floor Mount, NG
CWHS109 6 Unit O.D Floor Mount, LP
CWHS209 6 Unit O.D Floor Mount, NG
CWHS309 6 Unit D.V Floor Mount, LP
CWHS409 6 Unit D.V Floor Mount, NG
15 CWHS-IMC199 Rev. 03/16
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
Max. Hot Water Capacity @ 70°F rise (GPM) 10.6
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
16 CWHS-IMC199 Rev. 03/16
2 Unit Drawing Illustration / Dimensions
*All Units are in inches
<Front> <Right>
<Bottom>
>
17 CWHS-IMC199 Rev. 03/16
3 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 3
Max. Hot Water Capacity @ 30°F rise (GPM) 33.3
Max. Hot Water Capacity @ 70°F rise (GPM) 15.9
Minimum (Btuh) 16,000
Maximum (Btuh) 599,700
Model and Rack Specifications
Model Number CWHS102, (202), (302), (402)
Tankless Water Heater Model NCC199DV, NCC199OD (NG/LP)
Rack Dimensions (in) 70 (L) x 2(W) x 65 (H)
Weight -Fully Assembled (lbs) 301
Weight -Fully Assembled + Shipping (lbs) 443
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) 12
18 CWHS-IMC199 Rev. 03/16
3 Unit Drawing Illustration / Dimensions
*All Units are in inches
<Front> <Right>
<Bottom>
>
19 CWHS-IMC199 Rev. 03/16
4 Unit Floor Mount Frame Specifications (4, 3, 2 Possible Configuration)
BTU and Flow Rates for NCC199DV (GQ-C3257WZ-FF U.S) NCC199OD (GQ-C3257WZ U.S)
Number of Tankless Water Heaters 4 3 2
Max. Hot Water Capacity @ 30°F rise (GPM) 44.4 33.3 22.2
Max. Hot Water Capacity @ 70°F rise (GPM) 21.2 15.9 10.6
Minimum (Btuh) 16,000 16,000 16,000
Maximum (Btuh) 799,600 599,700 399,800
Model and Rack Specifications
Model Number
CWHS106, (206), (306),
(406)
CWHS105, (205), (305),
(405)
CWHS103, (203), (303), (403), (104), (204), (304), (404)
Tankless Water Heater Model NCC199DV, NCC199OD (NG/LP)
Rack Dimensions (in) 43 (L) x 29(W) x 65 (H)
Weight -Fully Assembled (lbs) 420 341 262
Weight -Fully Assembled + Shipping (lbs) 549 480 391
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) 16 12 8
<4 Units Back to Back> <3 Units Back to Back> <2 Units in Line> <2 Units Back to Back>
20 CWHS-IMC199 Rev. 03/16
4 Unit Drawing Illustration / Dimensions
*All Units are in inches
<Front> <Right>
<Bottom>
>
21 CWHS-IMC199 Rev. 03/16
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
Max. Hot Water Capacity @ 30°F rise (GPM) 66.6 55.5 33.3
Max. Hot Water Capacity @ 70°F rise (GPM) 31.8 26.5 15.9
Minimum (Btuh) 16,000 16,000 16,000
Maximum (Btuh) 1,199,400 999,500 599,700
Model and Rack Specifications
Model Number
CWHS109, (209), (309),
(409)
CWHS108, (208), (308),
(408)
CWHS107, (207), (307),
(407)
Tankless Water Heater Model NCC199DV, NCC199OD (NG/LP)
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
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 – 1/2"
Cold Water Manifold Pipe Diameter (in) 2 – 1/2"
Gas Manifold Pipe Diameter (in) 2"
Condensate Drain Manifold Pipe Diameter(in) 1"
Electrical Requirements
Voltage 120VAC (60 Hz)
Maximum Current (Amps) 24 20 12
<6 Unit Back to Back> <5 Unit Back to Back> <3 Unit Back to Back>
22 CWHS-IMC199 Rev. 03/16
6 Unit Drawing Illustration / Dimensions
*All Units are in inches
<Front>
<Bottom>
<Right>
23 CWHS-IMC199 Rev. 03/16
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
24 CWHS-IMC199 Rev. 03/16
For direct and non-direct vent clearance requirements, please refer to the chart below.
25 CWHS-IMC199 Rev. 03/16
* The clearance requirements from vent terminations to building openings chart above apply to O.D and S.V
converted units.
26 CWHS-IMC199 Rev. 03/16
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
27 CWHS-IMC199 Rev. 03/16
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)
28 CWHS-IMC199 Rev. 03/16
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)
29 CWHS-IMC199 Rev. 03/16
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
30 CWHS-IMC199 Rev. 03/16
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.
31 CWHS-IMC199 Rev. 03/16
32 CWHS-IMC199 Rev. 03/16
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.
33 CWHS-IMC199 Rev. 03/16
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.
34 CWHS-IMC199 Rev. 03/16
• 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
35 CWHS-IMC199 Rev. 03/16
Water Treatment
36 CWHS-IMC199 Rev. 03/16
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.
37 CWHS-IMC199 Rev. 03/16
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.
38 CWHS-IMC199 Rev. 03/16
39 CWHS-IMC199 Rev. 03/16
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.
40 CWHS-IMC199 Rev. 03/16
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.
41 CWHS-IMC199 Rev. 03/16
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.
42 CWHS-IMC199 Rev. 03/16
43 CWHS-IMC199 Rev. 03/16
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.
44 CWHS-IMC199 Rev. 03/16
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.
45 CWHS-IMC199 Rev. 03/16
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.
46 CWHS-IMC199 Rev. 03/16
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.
47 CWHS-IMC199 Rev. 03/16
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)
…….
Unit 6 Doesn’t ignite (unless
more water is being
demanded)
Unit 1 Doesn’t Ignite
Unit 2 Ignites
Unit 3 Doesn’t ignite (unless
more water is being
demanded)
…….
Unit 6 Doesn’t ignite (unless
more water is being
demanded)
48 CWHS-IMC199 Rev. 03/16
• 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.
49 CWHS-IMC199 Rev. 03/16
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
<Front>
22
22
50 CWHS-IMC199 Rev. 03/16
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
51 CWHS-IMC199 Rev. 03/16
52 CWHS-IMC199 Rev. 03/16
53 CWHS-IMC199 Rev. 03/16