Installation - Piping
6
Drain Valve
Drain valve and fittings are supplied by others.
Standard Installation
• Install a tee connection at the domestic cold
water inlet (Fig. 1 and 2 page 9).
• Pipe the drain piping with drain valve from
the tee connection to:
- a suitable place for disposal
or
- terminate within 12” of the floor
Manual Air Vent
1. A manual air vent is factory installed.
2. Open manul air vent and once the tank is full and
air has stop escaping the manual air vent close.
Thermal Expansion
If a backflow preventer, check valve or pressure
reducing valve is piped on cold water supply piping
of water heater, install an expansion tank on cold
water supply line to prevent normal thermal expan-
sion from repeatedly forcing open T&P relief valve.
T&P relief valve is not intended for constant
duty, such as relief of pressure due to
repeated normal system expansion. Correct
this condition by installing a properly sized
expansion tank in domestic water system.
Refer to expansion tank manufacturer’s
installation instructions for proper sizing.
Water Hammer
Dishwashers, clothes washers and fast-closing pos-
itive shut-off valves incorporated in the system all
contribute to creating water shock. Install a water
hammer arrester to prevent damage to pipes and
appliances. See device manufacturer’s instructions
for application and installation.
Water hammering within the domestic pip-
ing system can cause premature failure of
the inner tank of the water heater. This type
of failure is
NOT
covered under warranty.
Vacuum Breaker
Installing a vacuum breaker Watts N36-M1 or equiv-
alent on the domestic cold water inlet will prevent
damage to the inner tank if a negative pressure is
developed in the domestic supply line. See manu-
facturer’s instructions for application and installation
of the vacuum breaker.
CAUTION
NOTICE
Comfort manual _Comfort 55 9/8/14 10:29 AM Page 8