American Water Heater GAS-FIRED COMMERCIAL WATER HEATER - Manual (Page 18)

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Note: BEFORE PROCEEDING WITH THE INSTALLATION, CLOSE THE
MAIN WATER SUPPLY VALVE.
After shutting off the main water supply, open a faucet to relieve the water line
pressure to prevent any water from leaking out of the pipes while making the
water connections to the water heater. After the pressure has been relieved,
close the faucet. The COLD water inlet and HOT water outlet are identified on
the top and front of the water heater. Make sure the diptube is in place before
making the cold water connection. Make the proper plumbing connections
between the water heater and the plumbing system to the house. Install a
shut-off valve in the cold water supply line.
If this water heater is installed in a closed water supply system, such as the
one having a back-flow preventer in the cold water supply, provisions shall be
made to control thermal expansion. DO NOT operate this water heater in a
closed system without provisions for controlling thermal expansion.
Warranties do not cover damages from thermal expansions such as pressure
bulges and/or deformities. Your water supplier or local plumbing inspector
should be contacted on how to control this situation
After installation of the water lines, open the main water supply valve and fill
the water heater. While the water heater is filling, open several hot water
faucets to allow air to escape from the water system. When a steady stream
of water flows through the faucets, close them and check all water
connections for possible leaks. NEVER OPERATE THE WATER HEATER
WITHOUT FIRST BEING CERTAIN IT IS FILLED WITH WATER.
WARNING
FAILURE TO INSTALL AND MAINTAIN A NEW, LISTED
TEMPERATURE AND PRESSURE RELIEF VALVE WILL RELEASE
THE MANUFACTURER FROM ANY CLAIM WHICH MIGHT RESULT
FROM EXCESSIVE TEMPERATURE AND PRESSURES.
CAUTION
If sweat fittings are to be used, DO NOT apply heat to the nipples on top or
side of the water heater. Sweat the tubing to the adapter before fitting the
adapter to the water connections. It is imperative that heat is not applied to
the nipples containing a plastic liner.
CAUTION
Keep clear of combination temperature and pressure relief valve
discharge line outlet. The discharge may be hot enough to cause scald
injury. The water is under pressure and may splash.
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