If required by local code, you can install a field-supplied domestic hot water thermostatic
mixing valve on the outlet of the appliance to prevent excessively hot water from reaching a
faucet if the appliance is used in a high temperature heating system. Do not cap off the hot
and cold piping connections if they are not being used.
The appliance can be connected to the pressurized ½" or larger domestic cold water supply
piping and the domestic hot water piping in the home. The minimum domestic water pressure
required is 40 PSI and recommended to be 50 PSI or higher. Generating domestic hot water
with a water pressure lower than 40 PSI reduces the amount of hot water generated and
increases the risk of scaling in the heat exchanger.
The domestic hot and cold water connections must be furnished with isolation valves and
flushing taps.
Thermal expansion of the water in the domestic hot water piping and appliance can cause
excessive pressures to build in the piping system. This can cause the pressure relief valve to
discharge on a regular basis. This condition must be prevented with the installation of a
properly sized and installed domestic water expansion tank or other device designed for the
purpose.
Figure 37 Pressure Drop (psi) vs. Flow Rate (GPM) - CXDHW heat exchanger
A filter is required where contaminants are present in the supply water.
To Next Page
Loading...
Need help?
General
