Hatco Imperial Series Installation And Operating Manual page 14

INSTALLATION
4. Install the pressure reducing valve if water pressure
available to the booster heater inlet is over 172 kPa
(25 psi).
• Set pressure reducing valve at 138 kPa (20 psi) 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
138 kPa (20 psi) during flow, install standard 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.
NOTE: Optional brass pressure reducing valve with built-in
bypass (Hatco P/N 03.02.015.00) also available.
Pressure Reducing Valve
5. Install the temperature/pressure relief valve directly into
the marked fitting on the rear or side of the unit.
• 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 152 mm (6") 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 152 mm (6") 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 38 mm (1-1/2"( and 152 mm (6"(
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 121°C
(250°F) or greater. Excessive length, over 9.1 m (30'), 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 1034 kPa
(150 psi) or when water temperature reaches 99°C (210°F).
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.
14
English
WARNING
CAUTION
Form No. EBOOSTER_AAM-1017