Noritz CB199-DV - Freeze Prevention; Water Treatment

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Water Piping
Chapter4.–Installation
If this Combi Boiler 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 Combi Boiler 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
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, Combi 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 Combi Boiler comfortably, 14 to 70
PSI (98.1 to 491kPa ) of pressure is needed from the water supply.
Be sure to check the water pressure. If the water pressure is low, the
Combi Boiler 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
oor. If necessary, provide drain piping or use a drain hose to remove
the water.
DHW piping
•
Do not use lead, PVC, iron or any piping which has been treated with
chromates, Combi 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 Combi Boiler 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 Combi Boiler causing abnormal sounds and
decreasing the durability of the heat exchanger.
Freeze Prevention
1. Unit
This Combi Boiler has functions to protect itself from freezing by operating the pump and turning on the burner
when the thermistor detects lower than 46°F(8°C).
2. Heating System
• Freeze protection products may be used for the heating system. Freeze protection for new or existing systems requires
specially formulated glycol, which contains inhibitors to prevent the glycol from attacking the metallic system components.
• Before using freeze protection products, ensure that system uid contains proper glycol concentration and the inhibitor level
is appropriate. Noritz recommends against exceeding a 50% concentration of glycol.
• When using the freeze protection products, the system must be tested at least once a year, and as recommended by
the manufacturer of the glycol solution.
• When using the freeze protection products, allowance should be made for expansion of the glycol solution.
• Freeze damage is not covered by the warranty.
Water Treatment System
To DHW Cold
Water Supply
To Auto Feeder
Hot Water to Fixtures
Shutoff Valve
Shutoff Valve
Cold to Water
Heater
Shutoff Valve
Optional Sediment Filter
Water Treatment Device
City Water Supply
Pressure
Relief
Valve
Drain