Service manual

Electric Booster– Installation, Operating and Maintenance Instructions
5
2.6 FUNCTION OF PIPING ACCESSORIES
Expansion Chamber:
Quick closing solenoid valves on the dishwasher will produce a shock pressure exceedingly high – up to
800 lbs. This may cause leaks in the plumbing and damage equipment such as relief valves, gauges,
tank, and etc. To extend the life of the booster heater and other equipment, we recommend that a Diatrol
be installed on all installations.
Temperature and Pressure Indicating Gauge:
This gauge indicates the temperature and pressure and is useful when determining incoming water
temperature or adjusting the pressure reducing valve. It should be installed between the pressure
reducing valve and booster heater.
When a dishwasher is not equipped with a temperature gauge, a second gauge should be installed as
close to dishwasher as possible to verify 180ºF rinse temperature.
Temperature and Pressure Relief Valve:
The relief valve protects the tank from becoming overheated and/or over-pressurized. It opens and
releases water if the temperature exceeds 210ºF or if the pressure exceeds 125 psi (satisfies most local
codes). This device must be installed directly on the booster heater.
Pressure Reducing Valve with By-Pass:
When the supply pressure exceeds the final rinse pressure requirements, a pressure reducing valve with
built-in by-pass should be installed in the supply line to the booster heater. A pressure reducing valve
without a by-pass should not be installed, as water expansion due to heating will cause the relief valve to
open.
Optional Extra Low Water Cut-Off:
A number of service calls are caused by energizing the heating elements in a “dry” tank. Even
momentary testing of the installation when the tank is dry will appreciably shorten the life of the element
or burn it out and affect the calibration of the aquastat.
The low water cut-off will protect from burnout of heating elements by checking that the tank is completely
filled with water before allowing the elements to operate.
Wiring and controls Instructions Section 3
3.1 WIRING
CAUTION:
AC ONLY, USE COPPER WIRE ONLY, DO NOT USE ALUMINUM.
All electrical wiring is to be done in accordance with the Canadian Electrical Code, CSA C22.2 part 1,
and/or any local regulations and codes in Canada, or the National Electrical Code, ANSI/NFPA 70 (latest
edition) and/or any local regulations and codes in U.S.A. Verify the nameplate rating and check the
related codes to properly size conductors, switches and over-current protection. Check the voltage at the
feeder panel, compare to the values shown in Table 1, and supply the correct voltage power to the power
supply block on the booster heater. For wire connections, refer to the wiring diagram sticker on the back
of the booster heater front cover.
3.2 CONTROLS
A custom designed “rapid response” aquastat provides temperature control ensures safe operation. The
aquastat switch incorporates a magnetic contactor to complete the power circuit to the heating elements
and control the water temperature. By use of an adjustable dial the operating aquastat can control the
water to the desired temperature.