Hatco Powermite PMG-100 Installation And Operating Manual page 16

INSTALLATION
Plumbing Connections
NOTICE
Incoming water supply to booster heater must be a
minimum of 20 psi (1.4 kg/cm2). Water pressure less than
20 psi (1.4 kg/cm2) will decrease operating life of
recirculating pump and unit.
NOTE: Product failure caused by incoming water pressure less
than 20 psi (1.4 kg/cm2) is not covered under warranty
Do not back out or loosen any pipe fittings or leaks may
occur.
Incoming water in excess of 3 grains of hardness per
gallon (GPG) (0.75 grains of hardness per liter [GPL]) must
be treated and softened before being supplied to booster
heater(s). Water containing over 3 GPG (0.75 GPL) will
decrease efficiency, increase energy use, and reduce the
operating life of the unit through increased lime build-up.
Product failure caused by liming or sediment buildup is not
covered under warranty.
Inlet
Hatco Booster Water Heaters are designed to be connected
with 3/4" pipe at the inlet pipe from the primary water heater.
Water temperature from the primary water heater must be
at least 110°F (43°C) and should not exceed 160°F (71°C).
Minimum temperature differential between the inlet and outlet
temperature must never be less than 20°F (11°C).
NOTE: Refer to "Booster Heater Sizing Chart" for application
information.
Inlet line must be installed with a shut-off valve, a full open
gate or ball type valve, a 3/4" union, together with the blended
phosphate water treatment system, pressure reducing valve
set at 20 psi (1.4 kg/cm2) flow pressure and a temperature/
pressure gauge supplied by Hatco.
NOTE: Do not run a cold ground water line to the Booster
Heater.
NOTE: Be sure water flows through the pressure reducing valve
in the proper direction. Check the directional arrow.
Valve will reduce pressure only during flow conditions.
A 3/4" union fitting and a drain valve must also be installed to
allow for easy servicing.
The temperature/pressure relief valve must be installed into one
of two locations on the heater: either the right side or the back of
the unit. See the "Plumbing Connections" illustrations for exact
locations.
To prevent water leakage and damage to the unit, the location
for the temperature/pressure relief valve that is not used must
be plugged. (One plug is supplied by Hatco with the heater.)
Both temperature/pressure fittings must not be plugged.
NOTE: The Commonwealth of Massachusetts requires that if a
water treatment system is installed in line with the Hatco
Booster Heaters, a water backflow protector shall also
be installed.
Outlet
Using a 3/4" union and piping, connect the booster heater water
outlet to the dishmachine sanitizing rinse pipe connection.
NOTE: Be certain the connection is made to the final rinse and
not to the wash tank.
Install a temperature/pressure gauge in outlet line. Water
temperature at outlet should be 180°F (82°C).
NOTE: The temperature sensing element must be in water
stream.
Shock Absorber
In areas of high water pressure, Hatco recommends a shock
absorber be installed in the outlet line as close as possible
to the dishmachine. The shock absorber softens the water
hammer caused by automatic dishmachine valves.
NOTE: Fill booster heater with water to test for installation leaks.
Leave the water in booster to prevent pump damage in
the event the electrician should apply power.
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Form No. PMG100200M-0918