Service manual

Electric Booster– Installation, Operating and Maintenance Instructions
6
The electrical controls come pre-wired on the right-hand side of each booster heater where it is protected
from high ambient temperatures.
An indicator light visible on the front panel indicates that there is power to the heating elements when the
booster heater is in operation.
The low water cut-off (optional) uses a resistance-sensing probe to determine if the booster heater is
filled with water. If the booster heater is filled with water, the relay coil will close and allow the element to
turn on. Sensing resistance is dial-adjustable, turn dial clockwise to increase sensitivity.
Start-up Instructions Section 4
4.1 START-UP
WARNING:
The following instructions are intended as a guide for qualified persons. Before
switching power on, fill system with water and vent air. Check for and repair any
leaks in water piping.
Perform the following procedure to check for proper booster heater operation:
1. Set operating aquastat to give desired water temperature for dishwasher (usually 180ºF).
2. The operating aquastat setting should be at least 20ºF less than the temperature relief setting
(210ºF).
3. Lift relief valve handle to ensure the booster heater is completely filled with water.
4. Check flow pressure with water flowing through the booster heater and, if necessary, readjust the
pressure reducing valve to 20 psi or to pressure recommended by dishwasher manufacturer.
5. The pilot lamp indicates that power is on when booster heater is operating.
Maintenance Instructions Section 5
5.1 IMPORTANT
Many times when a booster heater does not appear to be functioning properly, the fault lies not with the
booster heater itself but with factors outside of the heater. Therefore, before becoming involved in
corrective work on the booster heater, the following steps should be followed:
 Check the temperature of the water feeding into the booster heater tank. It must be 140ºF or
the temperature designed and must be in sufficient quantity to hold its temperature
throughout the dishwashing operation.
 Incoming water temperature to the booster heater should not exceed 170ºF.
 If incoming water exceeds 20 psi, a pressure reducing valve must be installed.
 If the wash tank of the dishwasher is filled through the booster heater, this will use up all the
180ºF water in storage. Sufficient time must be allowed to reheat the water in storage before
starting the dishwasher.
 Water pressure at the inlet to the booster heater must be adequate for proper operation of
the rinse cycle of the dishwasher.
 Be sure that the relief valve is one supplied by Allied Engineering Company.
 A check valve should not be installed ahead of the booster heater. Remove if present.