Water Pipe Installation

• Shut off the cold water supply at the main shutoff valve.
• Open one or more faucets to relieve the pressure. Open the system drain, leave faucets open.
• Drain the domestic water system.
• Install piping and fittings, connecting the tank cold water inlet and cold water supply of the residence, using
a dielectric union, heat trap, shut-off valve, vacuum breaker, expansion tank (where required), and filter
(manufacturer recommended to prevent sediment buildup).
• Connect the tank DHW hot water supply piping. Install piping to hot DHW hot water supply connection using a
dielectric union, heat trap, vacuum breaker, and shut-off valve.
• Install Pressure Temperature Relief Valve. Pipe the relief valve discharge so the discharge from the valve exits only
within 6 inches above, or at any distance below, the structural floor. Any discharged water for the indirect water
heater shall not contact any live electrical part. The discharge opening must not be blocked or reduced in size under
any circumstances. DO NOT install any valve between the tank and Pressure Temperature Relief Valve.
• The Pressure and Temperature Relief Valve shall be installed a maximum of 8” away from the tank on the DHW
Outlet connection. Placing Pressure Temperature Relief Valve to close to the tank during installation could cause
damage to the tank due to soldering. See Figure 3.
• Fill the water heater tank. Open all faucets to allow air to purge from the tank and piping. Remove screens on
faucets. Open domestic hot water shut-off valve. Open cold water inlet shut-off valve. Purge all air from the
domestic water system. Allow water to run so the tank is completely purged of any debris. Run the water long
enough to change at least five tank volume changes. Close all faucets. Reinstall all of the screens in the faucets.
Check the system for leaks. Repair as required.