Form No. PMG-100/200M-0805
11
INSTALLATION
PLUMBING
Components
SUPPLIED WITH UNIT
OPTIONAL WITH UNIT
SUPPLIED BY INSTALLER
• Temperature/Pressure
• Back Pressure Relief
• 3/4" Gate or Ball Valve
Relief Valve
Valve
• Drain Valve
• Blended Phosphate Water
Treatment System
• 3/4" Unions
• Pressure Reducing Valve
• 3/4" Piping
• Temperature/Pressure Gauges (2)
• Shock Absorber
• 3/4" Plug (installed)
Pressure And Temperature Relief Valves
For protection against excessive pressures and
temperatures in the booster heater, install
temperature and pressure protective equipment by
local codes. Hatco supplies valves constructed with
brass working parts and heat resistant silicone seat
discs for all booster heater models.
WARNING
Valves supplied by Hatco are designed for high
temperature commercial operation. Do not
substitute Hatco valves with valves designed
for domestic water heaters.
Temperature/pressure protective equipment
should not be less than a combination
temperature/pressure relief valve certified by a
nationally recognized testing laboratory that
maintains periodic inspection of the
production of this equipment and meets the
requirements for Relief Valves and Automatic
Shutoff Devices for Hot Water Supply Systems,
ANSI Z21.22*CSA
4.4. The
temperature/pressure relief valve must be
marked with a minimum set pressure not to
exceed the marked maximum working
pressure of the booster heater.
CAUTION
Do not use an anti-siphon or check valve on
the incoming water line.
CAUTION
FOR INSTALLING PRESSURE AND
TEMPERATURE RELIEF VALVES IN
ACCORDANCE WITH ANSI Z21.22*CSA 4.4.
Combination pressure and temperature relief
valves with extension thermostats must be
installed so that the temperature-sensing
element is immersed in the water within the top
6" (152 mm) of the tank. They must be installed
either in the hot outlet service line or directly in
a tank tapping. Combination pressure and
temperature relief valves that do not have
extension elements must be mounted directly
in a tank tapping located within the top 6"
(152 mm) of the tank, and shall be adequately
insulated and located so as to assure isolation
from flue gas heat or other ambient conditions
that are not indicative of stored water
temperature. TO AVOID WATER DAMAGE OR
SCALDING DUE TO VALVE OPERATION,
DRAIN PIPE MUST BE CONNECTED TO VALVE
OUTLET AND RUN TO A SAFE PLACE OF
DISPOSAL. Drain pipe must be as short as
possible and be the same size as the valve
discharge connection throughout its entire
length. Drain line must pitch downward from
the valve and terminate at least 6" (152 mm)
above the floor drain where any discharge will
be clearly visible. The drain line shall terminate
plain, not threaded, with a material serviceable
for temperatures up to 250°F (121°C) or
greater. Excessive length, over 15' (4.57 m), or
use of more than two elbows can cause a
restriction and reduce the discharge capacity
of the valve. No shut-off valve shall be installed
between the relief valve and tank, or in the
drain line. Valve lever must be tripped
periodically to ensure that waterways are clear.
This device is designated for emergency
safety relief and shall not be used as an
operating control. The valves are set to relieve
at 150 pounds pressure or when water
temperature reaches 210°F (99°C). Read tag on
valve for additional information.
NOTE: If a check valve or water backflow protector
is installed and cannot be removed install a back
pressure relief valve, Hatco part number
03.02.039.00, set at 125 psi (862 kPa) on the
incoming line between the pressure reducing valve
and the inlet to the booster heater. Discharge must
be to open site drain.