Specifications

INSTALLATION
Form No. EBOOSTERM-0712
19
4. Install the pressure reducing valve if water pressure
available to the booster heater inlet is over 25 psi (172 kPa).
• Set pressure reducing valve at 20 psi (138 kPa) flow
pressure.
NOTE: Be sure water flows through the pressure reducing
valve in the proper direction. Check directional arrow.
Valve will reduce pressure only during flow conditions.
If water supply pressure to the booster inlet is over 20 psi
(138 kPa) during flow, install pressure reducing valve with
built-in bypass (Hatco P/N 03.02.004.00) for proper
operation of dish machine rinse nozzles.
NOTE: The pressure reducing valve must be the type equipped
with a high pressure bypass, as supplied by Hatco.
Pressure Reducing Valve
5. Install the temperature/pressure relief valve.
• Mini-Compact Series: P/N 03.02.020.00
• Compact and Imperial Series: P/N 03.02.022.00
Temperature/Pressure Relief Valve
CAUTION
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 Z21.22-1979. The
temperature/pressure relief valve must be marked with a
minimum set pressure not to exceed the marked
hydrostatic test pressure of the booster heater as noted
on the unit specifications.
FOR INSTALLING PRESSURE AND TEMPERATURE
RELIEF VALVES IN ACCORDANCE WITH AMERICAN
NATIONAL STD. Z21.22-1979. 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 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 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. Discharge
line 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
must terminate between 1-1/2" (38 mm) and 6" (152 mm)
above the floor drain where any discharge will be clearly
visible. The drain line shall terminate plain, not threaded,
with material serviceable for temperatures up to 250°F
(121°C) or greater. Excessive length, over 30' (9.1 m), or
use of more than four 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 assure 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 psi (1034 kPa) or when water temperature
reaches 210°F (99°C). Read tag on valve for additional
information.
BURN HAZARD: Valves supplied by Hatco are designed
for high temperature commercial operation. Do not
substitute Hatco valves with valves designed for domestic
water heaters.
Do not use an anti-siphon or check valves on incoming
water line.
CAUTION
WARNING