21
3.0 Piping
Note
Installers should contact local water purveyors about the suitability of their supply for use in
hydronic heating systems. If uncertain about the water quality, consult a local water treatment
expert about testing the water, and if necessary, treating the water.
Alternatively, water or hydronic fluid of known quality can be brought to the site.
The following procedure describes how to pipe the indirect water heater with the domestic water system. For
reference, see
.
3.1 Domestic water piping
1. Drain the domestic water system:
a. Shut off the cold water supply at the main shutoff valve.
b. Open one or more faucets to relieve the pressure.
c. Open the system drain, leaving the faucets open.
2. After positioning the water heater in the final location, install piping onto the cold inlet connection.
Connect to cold water supply connection using the following suggested components where
applicable: a union, a heat trap, a shut-off valve, a drain valve, an expansion tank, a back flow
preventer, and a vacuum breaker.
3. Connect the domestic hot water piping.
Install piping on to hot water supply connection using a union, a heat trap, and a shut-off valve.
4. Pipe the relief valve discharge so that the discharge from the valve will exit only within 6 inches above
a suitable drain. The discharge opening must not be blocked or reduced in size under any
circumstances.
5. Fill the water heater tank.
a. Open all faucets to allow air to purge from the tank and piping. Remove screens on faucets.
b. Open the domestic hot water shut-off valve.
c. Slowly open the cold water inlet shut-off valve.
d. Purge all of the air from the domestic water system.
e. Allow the water to run, so that you clear the tank of any debris.
Run the water long enough so that it runs clear and to change at least one tank volume change
past full.