Hatco IMPERIAL "S" - Manual (Page 28)

Form No. EBOOSTERM-0406 26
OPERATION
On/Off Switch Indicator Light
Figure 17. Controls-Imperial and Compact Models
SYSTEM START-UP
WARNING
Water in the unit is very hot. Wear protective
gloves and proper attire when operating to avoid
injury.
1. Close drain pipe valve.
2. Open shutoff valve to primary water supply.
Water temperature at inlet should be 110° to
140°F (43° to 60°C) and should not exceed
160°F (71°C).
NOTE: Minimum temperature differential between
inlet and outlet should never be less than 20°F
(11°C).
3. When tank is filled with water, vent all the air from
the tank through the dishwasher rinse nozzle
and the temperature/pressure relief valve.
CAUTION
Do not turn on power to booster heater until the
tank has been filled with water and all air has
been vented through the dishwasher rinse
nozzle. The heating elements will burn out in
seconds if operated when they are not
immersed in water.
4. Check all plumbing connections for leaks.
5. Check the temperature/pressure relief valve
discharge opening to be sure it is not blocked
and no scale or other foreign matter has reduced
the size of the opening.
6. Turn on the electrical supply to the booster
heater. On Imperial and Compact models,
position the on/off switch to the ON position and
the indicator light will come on. (See Figure 17.)
7. When the booster heater has had sufficient
heating time, operate the rinse cycle and check
the water temperature and pressure readings on
the gauges.
Water temperature at the booster outlet should
be 185°-190°F (85°-88°C) and flow pressure
should be 20 psi (138 kPa) maximum.
NOTE: Outlet water temperatures can be adjusted
for Low-Temperature Dishmachine applications.
See Maintenance Section for thermostat adjustment
procedure.
WARNING
Units are equipped with a High Temperature
Limit Safety Switch that will shut the power off if
the unit overheats. To avoid any injury to
personnel or damage to the unit, contact an
Authorized Hatco Service Agent if the High
Temperature Limit Safety Switch cannot be reset
or continues to trip.
SHUT DOWN
Under normal and regular operation Hatco
recommends that the unit be turned on at all times.
If the booster heater will not be used for an
extended period of time or will be exposed to
freezing conditions it should be drained to prevent
damage to the unit.
1. Disconnect power supply to the booster heater.
2. Close shut-off valve to booster heater inlet
supply.
3. Open drain valve and drain water from booster
heater tank.
CAUTION
To avoid damage to the unit always drain the
booster heater with power to the unit off, or
element burnout could occur.