Noritz NC1991-OD Installation Manual Download Page 2

2

1.

 Included Accessories

The following accessories are included with the unit.

Check for any missing items before starting installation.

Q’ty

Shape

Part

1

each

Part

Shape

Q’ty

2.

 Optional Accessories

The accessories listed below are not   

included with the units, but may be necessary 

for installation.

Quick Connect Cord

(QC-2)

Q’ty

Shape

Part

Part

Shape

Q’ty

1

1

Remote Controller

Cord (26ft (8m))

1

each

Isolation Valves

(includes pressure 

relief valve)

Pipe Cover

(PC-2S-GRY)

1

1

Owner's Guide, Warranty,

Installation Manual 

(this document)

System Controller

(SC-301-6M-EXT)

Anchoring Screw

5

1

Remote Controller 

(See p. 16)

Remote Controller 

Cord (6ft (2m))

1

Summary of Contents for NC1991-OD

Page 1: ...uctions Failures and damage caused by erroneous work 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 Inst...

Page 2: ...ed below are not included with the units but may be necessary for installation Quick Connect Cord QC 2 Q ty Shape Part Part Shape Q ty 1 1 Remote Controller Cord 26ft 8m 1 each Isolation Valves includ...

Page 3: ...ater temperature will become unstable as the pipe length increases Quick Connect cord Union Gas Valve Union Shutoff Valve Shutoff Valve Hot Water Cold Water Leave enough clearance around the plumbing...

Page 4: ...ater 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 impure treat the...

Page 5: ...heat Also consider the surrounding trees and animals The heat and moisture from the water heater may cause discoloration of walls and resinous materials or corrosion of aluminum materials Do not loca...

Page 6: ...f 24 600mm or more in front of the unit to facilitate inspection and repair Do install the unit such as the wall of the second floor where the unit is out of reach When installing the unit in a common...

Page 7: ...a mechanical air supply inlet 6 ft 1 83 m L Clearance above paved sidewalk or paved driveway located on public property Clearance under veranda porch deck or balcony 7 ft 2 13 m M 1 In accordance with...

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: ...Z223 1 Natural Gas Meter See next page for the pipe capacity charts Noritz Tankless Gas Water Heater 199 900 Btuh Clothes Dryer 35 000 Btuh Barbecue 50 000 Btuh Gas Range Stove 65 000 Btuh 10 3m 10 3...

Page 10: ...787 1496 55 112 213 440 675 1260 Maximum Capacity of Flex TracPipe in Cubic Feet per Hour of Natural Gas 0 60 Specific Gravity 0 5 WC Pressure Drop Length in Feet Pipe Size 3 4 1 1 1 4 1 1 2 2 206 383...

Page 11: ...be connected 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...

Page 12: ...e Use shower heads with low pressure loss If necessary use a pump or other means to ensure that the supply water pressure to the inlet of the heater does not fall below 29 PSI when the maximum amount...

Page 13: ...nt Required Treatment Required Treatment Required Install Noritz Isolation Valves to allow for flushing Flushing is required if a water treatment device is not installed Suggested Suggested Install No...

Page 14: ...tat if the water heater is not controlling the pump Set the Aquastat to 10 F 5 C below the set output temperature 4 Noritz recommends the use of an Isolation Kit with the installation These kits inclu...

Page 15: ...ly required by the water heater is 120VAC at 60 Hz The power consumption may be up to 228W or higher if using optional accessories Use an appropriate circuit Do not disconnect the power supply when no...

Page 16: ...te controller is removed 185 F 85 C 140 F 60 C 135 F 57 C 120 F 50 C To change the default temperature adjust the dip switches as described below The default temperature is 120 F 50 C 1 Disconnect ele...

Page 17: ...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 18: ...e controller 2 Disconnect then reconnect electrical power to the water heater 3 Press the MENU Button inside the cover select Initial settings using the Buttons 4 Press the ENTER button the Initial se...

Page 19: ...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 20: ...mp 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 Cord...

Page 21: ...r 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...

Page 22: ...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 23: ...NG HOLE NC1991 OD 1 8 45mm 2 2 55mm 2 2 56mm GAS INLET COLD WATER INLET HOT WATER OUTLET AIR INLET AIR INLET WIRING THROUGHWAY WATER DRAIN VALVE WATER FILTER HOT WATER OUTLET WATER DRAIN VALVE WIRING...

Page 24: ...nutes 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 cont...

Page 25: ...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 26: ...tat Pump Control Wires use external relayU 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 27: ...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 301...

Page 28: ...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 Clos...

Page 29: ...List The value in indicates the quantity Remote Controller Mounting bracket Round countersunk head wood screw Wall anchor Raised countersunk head screw For junction box installation Machine screw Whe...

Page 30: ...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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