Dunkirk H2OI Single Coil Stainless Steel Indirect Water Heaters - Manual (Page 11)

11
F. Water Quality
Improper water quality will reduce the expected life of the water heater. Hard water, sediment, high or low Ph, and high
levels of chlorides in the domestic water should be avoided. Sediment and hard water will eventually coat the heating coil
inside the water heater and reduce the rate of hot water production and may, eventually cause a failure. High or low Ph
and/or high chloride concentrations will cause corrosion and eventually failure. A filter is strongly recommended where
sediment is present in the water. A water softening system is recommended for areas with hard water.
In an area where the water quality is not known, a water quality test should be performed.
WARNING:
Do not operate the water heaters in areas where the Ph is above 8.0 or below 6.0, and/or with chloride concentrations
greater than 100 parts per million (ppm). ECR’s standard warranty does not cover problems caused by improper water Ph
or excessive levels of chlorides.
III. Piping
A. Domestic water piping. See Figure 1.
1. Shut off the cold water supply at the main shutoff valve.
Open one or more faucets to relieve the pressure. Open the system drain, leaving the faucets open.
Drain the domestic water system.
2. Position the water heater in the final location.
3. Connect the cold water supply piping.
• Install piping onto cold inlet connection.
• Connect to cold water supply connection using a union, a heat trap, a shut-off valve, a vacuum breaker, an
expansion tank (where required), and a filter (recommended to prevent sediment buildup).
NOTICE
If installing on a city supply, a properly sized thermal expansion tank is required and should be installed in
accordance with the product installation manual.
If a water heater is installed in a closed water supply system, such as one having a backflow preventer in the cold
water supply, a check valve in the cold water supply, or a pressure reducing valve in the cold water supply means
shall be provided to control thermal expansion.
The appliance, when installed, must be grounded in accordance with the local codes, or in the absence of local
codes, with the National Electrical Code, ANSI/NFPA 70.
WARNING
If this product is connected to a cold water supply line that has a check valve, a backflow preventer, a pressure
reducing valve, or a check valve in the water meter, it is a requirement that a properly sized thermal expansion
tank be installed in the cold water inlet line. There will be no warranty on applications where there is no pressure
control.
4. Connect the domestic hot water piping.
Install piping on to hot water supply connection using a union, a heat trap, a vacuum breaker, and a shut-off
valve.
NOTICE
Damage to tanks caused by improper water quality is not covered under the warranty.