LAARS U.H.E. - Installation Manual - Manual (Page 15)

SECTION V: WATER CONNECTIONS
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.
Hydrogen gas can be produced in an operating water heater that has not had water drawn from the tank for a long
period of time (generally two weeks or more). HYDROGEN GAS IS EXTREMELY FLAMMABLE. To prevent
the possibility of injury under these conditions, we recommend the hot water faucet to be open for several minutes at
the kitchen sink before you use any electrical appliance, which is connected to the hot water system. If hydrogen is
present, there will be an unusual sound such as air escaping through the pipes as hot water begins to flow. Do not
smoke or have open flame near the faucet at the time it is open.
Keep clear of the 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.
CAUTION
If sweat fittings are to be used, DO NOT apply heat to the nipples in front 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.
INSTRUCTIONS FOR CONNECTIONS
1. 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. The COLD water inlet
and HOT water outlet are identified on the water heater. 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.
2. 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 must 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 expansion such as pressure bulges and/or deformities. Your
water supplier or local plumbing inspector should be contacted on how to control this
situation.
Figure 9. Scald
Warning
3. 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.
4. Never operate the water heater without first being certain it is filled with water.
SCALDING
This water heater can deliver scalding temperature water at any faucet in the system. Be
careful whenever using hot water to avoid scalding injury. Certain appliances such as
dishwashers and automatic clothes washers may require increased temperature water. By
setting the thermostat on this water heater to obtain the increased temperature water required
by these appliances, you might create the potential for scald injury. To protect against injury,
you should install an ASSE approved mixing valve in the water system. This valve will
reduce point of discharge temperature by mixing cold and hot water in branch supply lines.
Such valves are available from the local plumbing supplier.
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