Whirlpool 12307 Benutzerhandbuch

12

Piping, fittings, and valves should be installed according to 
the installation drawing (Figure 13). If the indoor installation 
area is subject to freezing temperatures, the water piping 
must be protected by insulation.

Water supply pressure should not exceed 80% of the 
working pressure of the water heater. The working pressure 
is stated on the water heater’s data plate. If this occurs, 
a pressure limiting 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 

13. Connect the cold water supply (3/4” NPT) to the 
fitting marked “C”. Connect the hot water supply (3/4” 
NPT) to the fitting marked “H”.

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 tempering valve or an anti-scald device 
in the domestic hot water line as shown in Figure 14. 
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 ex-
cess 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.

In a closed system use a
thermal expansion tank

Figure 13
Water Piping Installation

Main

Water

Supply

Cold Water

Inlet Valve

Cold Water

Supply to Fixtures

Hot Water
Outlet

Union

Temperature and
Pressure Relief Valve

Discharge line
6” maximum
above drain

Drain line
3/4” ID
minimum

Drain

Metal
Drain Pan
1 3/4” depth maximum

1”minimum

Massachusetts:
Install a vacuum relief
in cold water line per
section 19 MGL 142.

Pressure reducing
valve with bypass

Figure 14
Typical Tempering
Valve Installation

Follow the tempering
valve manufacturer’s
instructions.

Cold

Water

Inlet

Hot

Water
Outlet

Tempered water
to fixtures

Tempering valve
(Set to 120°F)