Noritz GQ-C3257WZ US Installation Manual Download Page 40

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120VAC

System Controller Unit

Water heater

Terminals

(Units 1 - 12)

Remote Controller Cord

terminal block

Remote Controller Cord

terminal block

Remote Controller Cord

terminal block

PCB

Power

PCB

Power

PCB

Power

PCB

Remote Controller Cord

Remote

Controller

System controller

power supply

Unit 1

Unit 2

Unit 3

CAUTION

• The below diagram shows the connection of 3 units to the system controller. When connecting 4

or more units, follow the same procedure.

• Connect the water heaters to the system controller follwing the detailed wiring instructions

included with the system controller.

• Always connect a remote controller to the system controller. Do not connect the included remote

controllers to the individual water heaters. These remote controllers will not be used.

* The remote controller terminal location

may differ depending on the unit.

Multi-System Wiring (Use SCU-301-12M)

Summary of Contents for GQ-C3257WZ US

Page 1: ...or work not as instructed in this manual are not covered by the warranty Check that the installation was done properly in accordance with this Installation Manual upon completion After completing ins...

Page 2: ...Part Part Shape Q ty 1 1 Remote Controller Cord 26ft 8m 1 each Isolation Valves includes pressure relief valve Pipe Cover PC 3S SUS 1 1 Owner s Guide Warranty Installation Manual this document 1 Syst...

Page 3: ...Block Cord Connector Cord Connector 3 Quick Connect Multi System Installation The Quick Connect Multi System allows the installation of two units together utilizing only the Quick Connect Cord Typica...

Page 4: ...erature of the water supply as unexpected accidents may occur as a result Check Water Supply Quality If the water supply is in excess of 12 grains per gallon 200 mg L of hardness acidic or otherwise i...

Page 5: ...he water heater may cause discoloration of walls and resinous materials or corrosion of aluminum materials Do not locate the vent termination directed towards a window or any other structure which has...

Page 6: ...width Provide clearance of 24 600mm or more in front of the unit to facilitate inspection and repair Do install the unit in a location where the unit is out of reach such as the wall of the second flo...

Page 7: ...149 1 Natural Gas and Propane Installation Code 2 In accordance with the current ANSI Z223 1 NFPA 54 National Fuel Gas Code A vent shall not terminate directly above a sidewalk or paved driveway that...

Page 8: ...arts may be damaged and may become highly dangerous Install the unit on a vertical wall and ensure that it is level Locating Screw Holes Mounting Structure When installing with bare hands take caution...

Page 9: ...e installer The installer must be professionally trained to do such work and must always follow all local and national codes and regulations Gas line sizing calculations must be performed for every in...

Page 10: ...ding to total btuh demand of the building and length from the meter or regulator so that the following supply pressures are available even at maximum demand WARNING Natural Gas Supply Pressure Min 4 W...

Page 11: ...se 50 15m 175 000 Btuh requires 1 Outlet E 25 7 5m Use 30 9m 199 900 Btuh requires 3 4 Section 4 45 13 5m Use 50 15m 355 000 Btuh requires 1 1 4 Natural Gas Meter Noritz Condensing Tankless Gas Water...

Page 12: ...t each appliance to verify all appliances are receiving a minimum of 5 WC for NG or 8 WC for LP If all appliances are not receiving the minimum inlet pressure the gas piping system may need to be chan...

Page 13: ...nnected to any heating system or components previously used with a nonpotable water heating appliance When water is required in one part of the system at a higher temperature than in the rest of the s...

Page 14: ...let If this is not done local boiling will occur inside the water heater causing abnormal sounds and decreasing the durability of the heat exchanger Freeze Prevention Freezing is prevented within the...

Page 15: ...s an example Please check with the actual water heater about the position of piping and form If this water heater will be installed in an application where the supply water is hard the water must be t...

Page 16: ...ain valve V3 and then the other to the circulating pump 4 Connect the drain hose H2 to the circulating pump 5 Connect the drain hose H3 to the drain valve V4 6 Pour 1 gallon of and gallon water into t...

Page 17: ...The code C60 is displayed on the Remote Controller when the water heater detects the flow of the flushing solution When 1 minute passes the code C60 will change to C59 on the Remote Controller 6 When...

Page 18: ...t Covers 9 Open the gas supply valves and water outlet valves 10 Check for correct operation of the water heaters is displayed when the Main Water Heater s blue connector is connected is displayed whe...

Page 19: ...g ON OFF PROG ALARM OFF 120 F Temp CCC Error unit 01 Beep Beep Press ON ON ALARM OFF STOP OFF Display Example In case of Unit 1 s blue connector is connected System down is displayed when the all unit...

Page 20: ...cedure 3 1 3 5 7 Disconnect the blue connector marked FLUSH for flushing The Code CCC goes out on the Remote Controller 8 Close the Front Covers 9 Open the gas supply valves and water outlet valves 10...

Page 21: ...as short as possible Long runs or applications where the nearest drain is above the water heater will require the use of a condensate pump Size the pump to allow for a maximum condensate discharge of...

Page 22: ...CE 1 2 PVC pipe DO NOT ADD ANY VALVES DO NOT ADD ANY VALVES Condensing Tankless Gas Water Heater Condensing Tankless Gas Water Heater Note If the drain line becomes clogged or frozen condensate will b...

Page 23: ...p control requirement in order to maintain the full recirculation waranty 4 Noritz recommends the use of an Isolation Kit with the installation These kits include an integrated shut off and service va...

Page 24: ...ly required by the water heater is 120VAC at 60 Hz The power consumption may be up to 303W or higher if using optional accessories Use an appropriate circuit Do not disconnect the power supply when no...

Page 25: ...to allow a maximum temperature setting of 120 F 50 C To access higher temperature settings through the remote controller follow the steps below When setting the maximum temperature to 125 185 F 55 85...

Page 26: ...ode and cause problems Be sure to hand tighten when screwing to the terminal block Power tools may cause damage to the terminal block 1 Check to make sure that the remote controller cord has plenty of...

Page 27: ...cover select Initial settings using the Buttons 4 Press the ENTER button the Initial settings screen appears on the display 5 Select F gal C L using the Buttons 6 Press the ENTER Button and select eit...

Page 28: ...m a wall circuit to the pump 5 Replace the front cover Pump Wiring This feature is not available when using the Quick Connect Multi System feature Relay connection with larger pumps 85 W 1 Locate and...

Page 29: ...lamp Ground wire Connector Use one of the vacant holes Connector Connecting Quick Connect Cord 2 Caution For Quick Connect Multi System Installation use part QC 2 only sold separately Quick Connect Co...

Page 30: ...a proper blue color and consistency If the flame does not appear normal the burner may need to be cleaned If the burner needs to be cleaned it must be performed by a qualified service technician Do no...

Page 31: ...ower to the unit 8 The unit will now operate whenever hot water is called for If the unit will not operate follow the shutdown instructions and call a service technician Shutdown Instructions 1 Stop a...

Page 32: ...AIN 1 2 WIRING THOROUGHWAYS 2 2 56mm 2 2 55mm 1 7 44mm 0 8 20mm GAS INLET COLD WATER INLET HOT WATER OUTLET CONDENSATE DRAIN FROM BOTTOM OF CASE HEIGHT OF EACH FITTING 4 0 5 13mm 6 0 24 x 0 4 6 x 10mm...

Page 33: ...tes of connecting electrical power before turning on the Power On Off Button press the or button on the remote controller and hold until the display blinks 99 If 99 does not blink on the remote contro...

Page 34: ...is system will make hot water more quickly available to remote fixtures The pump will circulate water through the loop until the entire loop is warm and then the system controller will turn off the pu...

Page 35: ...tat Pump Control Wires use external relayV Unit 1 Set Yes for the question Start pump rotation in system settings See SC 301 6M Installation Manual When installing 2 pumps in parallel Set Yes for the...

Page 36: ...02 PCB Power PCB B5 B5 System Controller No 5 No 4 No 3 No 2 Remote Control terminal block Remote control terminal block Remote Controller Cord PCB Power PCB PCB Power PCB Multi System Wiring Use SC 3...

Page 37: ...to both the cold water supply piping and the hot water supply piping to prevent freezing during cold weather and to prevent heat loss through the piping Unit 1 Unit 2 Unit 3 Unit 10 Unit 11 Unit 12 S...

Page 38: ...ontroller This system will make hot water more quickly available to remote fixtures The pump will circulate water through the loop until the entire loop is warm and then the system controller will tur...

Page 39: ...e Hot water storage tank copper or stainless steel pipe Return line circulation pump Size for max flow Size for max flow Storage tank supply line copper or stainless steel pipe Storage tank return lin...

Page 40: ...nit 2 Unit 3 CAUTION The below diagram shows the connection of 3 units to the system controller When connecting 4 or more units follow the same procedure Connect the water heaters to the system contro...

Page 41: ...r In order to use this product safely read this installation manual carefully and follow the installation instructions Potential dangers from accidents during installation and use are described below...

Page 42: ...t The value in indicates the quantity Remote Controller Mounting bracket Raised countersunk head wood screw Wall anchor Raised countersunk head screw For junction box installation Machine screw When a...

Page 43: ...f the remote controller and the frame pull the entire decorative frame forward while pressing the sections indicated where the fingers are in the figure below If it does not come off insert a flat hea...

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