Dunkirk ARTESIAN 220 Installation And Operating Instructions Manual page 28

2) Domestic Water Side Piping
Figure 10 shows typical domestic water piping for a water heater. All components except the aquastat
are provided by the installer. The function of the components shown are as follows:
a) Control (required) - This control is provided by Dunkirk and must be installed in the location
indicated. It is imperative that the bulb of the control is "bottomed out" in the control well.
b) Shut-off valves (recommended) - use to isolate the tank for servicing.
c) Unions (optional) - Use to disconnect the water heater in the unlikely event that this is necessary.
d) Temperature/Pressure Relief Valve (Optional) - Opens to relieve excess pressure or temperature,
which has developed in the water heater's heat exchanger.
e) Heat Trap (Optional) - The heat trap retards the migration of heat from the water heater upon the
hot water supply pipe.
f) The use of a flow restricter may be required to control flow rates when necessary.
Water heater Piping With A "Temperature Limiting Valve"
At first draw, the domestic water temperature will be equal to the control temperature setting on the
tank.
The temperature of water going to the fixtures may be more carefully controlled with a thermostatic
mixing valve. This device blends a controlled amount of cold water with the hot water leaving the water
heater so that water at a more constant temperature exits the mixing valve. Typical thermostatic
mixing valve piping is illustrated on figure12.
Warning
• Feel water before bathing or showering
• If anti-scald or anti-chill protection is required, use devices specifically designed for such
service. Install these devices in accordance with their manufacturer's instruction.
• It is strongly recommended that a thermostatic mixing valve be used on all residential
installations.
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