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4
Domestic Side (Tank) Piping
Anti-scald Valves (Mixing Valves)
Anti-scald valves used with water heaters are also called
tempering valves or mixing valves. An anti-scald valve
mixes cold water in with the outgoing hot water to assure
that hot water reaching a building fixture is at a
temperature low enough to be safe. ASSE1017 and
ASSE1070 certified valves are recommended.
Usually, the maximum temperature of the outlet water will
stay near the setting of the tank control. In some cases,
however, hot water usage patterns can cause the outlet water
temperature to rise significantly above the control setting.
The temperature of water going to the fixtures may be more
carefully controlled through the use of a thermostatic
mixing valve. This device blends a controlled amount of
cold water with the hot water leaving the tank so that water
at a more constant temperature exits the mixing valve.
Anti-scald mixing valve piping is illustrated in FIG.'s 3-1
thru 3-4.
An anti-scald mixing valve does not
WARNING
eliminate the risk of scalding.
*
Set the tank thermostat as low as
practical.
*
Feel water before bathing or
showering.
*
If anti-scald or anti-chill protection
is required, use devices specifically
designed for such service. Install
these devices in accordance with
their manufacturer's instructions.
Install Drain Valve
Drain valve and fittings are supplied by others.
Standard Installation
•
Install a tee connection at the domestic cold water
inlet (FIG. 4-1).
Figure 4-1 Drain Valve Installed
DRAIN
VALVE
SDT/SET Installation & Operation Manual
(continued)
Temperature & Pressure (T&P) Relief Valve
For
WARNING
temperatures
temperature
equipment required by local codes, but not
less than a combination temperature and
pressure relief valve certified by a nationally
recognized testing laboratory that maintains
periodic inspection of production of listed
equipment or materials as meeting the
requirements
Automatic Gas Shutoff Devices for Hot
Water Supply Systems, ANSI Z21.22 and the
Standard CAN1-4.4, Temperature, Pressure,
Temperature and Pressure Relief Valves and
Vacuum Relief Valves.
temperature and pressure relief valve shall
be marked with a maximum set pressure not
to exceed the maximum working pressure of
the water heater.
temperature and pressure relief valve shall
also have an hourly rated temperature steam
BTU discharge capacity not less than shown
in Table 4A, page 14.
Install the combination temperature and
pressure relief valve into the opening
provided and marked for this purpose on
the water heater.
protection
against
excessive
and
pressure,
and
pressure
protective
for
Relief
Valves
The combination
The combination
install
and
13
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