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Water Piping
Chapter 4. – Installation
If this water heater will be installed in an application where the supply water is
hard, the water must be treated with either the Noritz H2Flow or Scale Shield
or a water softener. Refer to the below tables for suggested treatment and
maintenance measures to be taken based on the water hardness level. Damage
to the water heater as a result of water in excess of 12 gpg (200 mg/L) of
hardness is not covered by the Noritz America Limited Warranty.
Note: Water softeners may be regulated by the local water jurisdiction, consult
with the manufacturer for code, sizing, and installation guidelines; the below
diagram is for reference only. For more information about H2Flow and Scale
Shield, contact Noritz America at 866-766-7489.
Water Treatment
Water Treatment System
Electrical power, gas, water, and the main switch must be on. If any of the above items are not connected properly, then
water must be drained including the condensation trap and unit unplugged from electrical power.
Supply water piping
•
Do not use PVC, iron, or any piping which has been treated with
chromates, boiler seal or other chemicals.
• Mount a check valve and a shut off valve (near the inlet).
• In order for the client to use the water heater comfortably, 98.1 to
491 kPa (14 to 70 PSI) of pressure is needed from the water supply.
Be sure to check the water pressure. If the water pressure is low, the
water heater cannot perform to its full capability, and may become a
source of trouble for the client.
Drain piping
•
Expansion water may drop from the pressure relief valve and wet the
floor. If necessary, provide drain piping or use a drain hose to remove
the water.
Hot water piping
•
Do not use lead, PVC, iron or any piping which has been treated with
chromates, boiler seal or other chemicals.
• The longer the piping, the greater the heat loss. Try to make the
piping as short as possible.
• Use mixing valves with low water resistance. 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 of water is being demanded.Also install a
pressure meter on the inlet.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
1-1. Recirculation Pump mode.
•
When water temperature falls between 42°F(5.5°C) and 46°F(8°C), the circulation pump starts operating for freeze protection.
•
Mixing valve maintains open for internal water circulation.
•
The cycle will restart at the approximate time interval (operate for 10 min and stops for 30 sec) and and it will stop if the water temperature
goes above 50°F(10°C).
1-2. Burner Combustion mode.
•
When water temperature drops below 41°F (5°C) it will start minimum combustion with internal water circulation.
•
When water temperature goes above 104°F (40°C) it will stop.
•
After combustion mode is stopped, the pump will continue for 3 minutes..
•
If the water heater is turned on for recirculation mode, pre-heating mode, or hot water use mode, the freeze protection mode will
automatically stop.
Summary of Contents for Eco TOUGH NRCP111-DV-LP
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