Hatco IMPERIAL "S" Installation & Operating Manual page 23

Inlet
Refer to Figure 8, 9, 10, 11 or 12.
1. Connect the booster water inlet to a hot water
supply line from the regular water heater. Water
temperature from the regular water heater
should be 110° or 140°F (43° or 60°C) and
should not exceed 160°F (71°C). Minimum
temperature differential between inlet and outlet
should never be less than 20°F (11°C).
NOTE: Refer to BOOSTER HEATER SIZING
CHART for application information.
WARNING
To avoid personal injury and avoid damage to
the booster heater refer to BOOSTER HEATER
SIZING CHART in this manual.
CAUTION
To assure proper operation on all Compact
Series Booster Heaters, do not turn or adjust
inlet water connection on unit. Doing so will
change the internal water flow.
NOTE: Red mark on inlet water pipe of Compact
series units must remain in the top most position.
CAUTION
To prevent electrolysis or plumbing damage
dielectric couplings
connecting dissimilar
galvanized to copper.
CAUTION
To avoid possible leaks, do not back out or
loosen any pipe fitting.
CAUTION
Incoming water in excess of 3 grains of
hardness per gallon ([GPG] .75 grains of
hardness per liter [GPL]) must be treated and
softened before being supplied to booster
heater(s). Water containing over 3 GPG or
.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.
NOTE: Product failure caused by liming or sediment
buildup is not covered under warranty.
should be used
metals, such as
2. Provide the inlet line with a shut-off valve, (a full
opening
temperature/pressure gauge, and the pressure
reducing valve. Set pressure reducing valve at
20 psi (138 kPa) flow pressure.
NOTE: A 3/4" union and a drain valve are required
for easy servicing.
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.
3. Install a temperature/pressure gauge in both the
inlet and outlet lines. Install the temperature
sensing bulb in the water stream. The gauge
must be mounted upright. (See Figures 14
and 15.)
NOTE: Tighten gauge during installation by only
turning the 1/2" brass nut. DO NOT turn the face of
the gauge. Turning the face will cause inaccurate
measurements.
NOTE: Some dishmachines require two booster
heaters be plumbed in series (not parallel) to meet
the demand. (See Figure 9.) To assure proper
operation a 20°F (11°C) temperature differential
must be maintained between the outlet of the first
booster heater and the inlet of the second booster
in
heater.
21
INSTALLATION
gate or ball type),
Form No. EBOOSTERM-0406
one