Kenmore 153.339432 - Manual (Page 21)

WATER SYSTEM PIPING
Piping Installation
IN A CLOSED SYSTEM USE A
Piping, fittings, and valves should be installed according to the
installation drawing (Figure 22). If the indoor installation area
is subject to freezing temperatures, the water piping must be
protected by insulation.
The water supply pressure should not exceed 80 psi. If this
occurs, a pressure reducing valve with a bypass may need to
be installed in the cold water inlet line. This should be placed
on the supply to the entire house in order to maintain equal hot
and cold water pressures.
IMPORTANT: Heat cannot be applied to the water fittings on
the heater as they may contain nonmetallic parts. If solder
connections are used, solder the pipe to the adapter before
attaching the adapter to the hot and cold water fittings.
IMPORTANT: Always use a good grade of joint compound and
be certain that all fittings are drawn up tight.
1. Install the water piping and fittings as shown in Figure 22.
Connect the cold water supply (3/4” NPT) to the cold water
inlet fitting. Connect the hot water supply (3/4” NPT) to the
hot water outlet fitting.
IMPORTANT: Some models may contain energy saving heat
traps to prevent the circulation of hot water within the pipes. Do
not remove the inserts within the heat traps.
2. The installation of unions in both the hot and cold water
supply lines is recommended for ease of removing the
water heater for service or replacement.
3. The manufacturer of this water heater recommends
installing a mixing valve or an anti-scald device in the
domestic hot water line as shown in Figure 23. These
valves reduce the point-of-use temperature of the water
by mixing cold and hot water and are readily available
for use.
4. If installing the water heater in a closed water system,
install an expansion tank in the cold water line as specified
under “Closed System/Thermal Expansion.”
5. Install a shut-off valve in the cold water inlet line. It
should be located close to the water heater and be easily
accessible. Know the location of this valve and how to shut
off the water to the heater.
6. A temperature and pressure relief valve must be installed
in the opening marked “Temperature and Pressure
(T & P) Relief Valve” on the water heater. A discharge line
must be added to the opening of the T&P Relief Valve.
Follow the instructions under “Temperature and Pressure
Relief Valve.”
7. After piping has been properly connected to the water
heater, remove the aerator at the nearest hot water faucet.
Open the hot water faucet and allow the tank to completely
fill with water. To purge the lines of any excess air, keep
the hot water faucet open for 3 minutes after a constant
flow of water is obtained. Close the faucet and check all
connections for leaks.
FIGURE 23.
Please note the following:
• The system should be installed only with piping that is
suitable for potable (drinkable) water such as copper, CPVC,
or polybutylene. This water heater must not be installed
using iron piping or PVC water piping.
• Use only pumps, valves, or fittings that are compatible with
potable water.
• It is recommend that only full flow ball or gate valves are used
in water piping installations. The use of valves that may cause
excessive restriction to water flow is not recommended.
• Use only 95/5 tin-antimony or other equivalent solder. Any
lead based solder must not be used.
• Piping that has been treated with chromates, boiler seal, or
other chemicals must not be used.
• Chemicals that may contaminate the potable water supply
must not be added to the piping system.
21