Cleveland SteamCraft V, Service Manual

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CET-16 Service Manual Page 57
8. Disconnect potentiometer, the contactor(s) should should torn immediately
Measure the resistance of the potentiometer. The resistance should be
between 10,000 and 18,000 Ohms (
see Figure 5-8
).
9. Reconnect the potentiometer. The contactor(s) should turn on
immediately.
10. Disconnect potentiometer and reconnect the probe.
TEMPERATURE CONTROL CIRCUITS
The SteamCraft V uses two separate temperature control circuits. These
circuits provide standby operation and power conservation. Each circuit
uses a negative temperature coefficient thermoistor as a temperature
sensor and a board mounted potentiometer for set point adjustment.
Replacement of either thermoistor the control board requires calibration
of BOTH temperature control circuits. The operation of both the
generator temperature adjustment circuit and the drain temperature
adjustment circuit use the rear healer contactor to control generator
temperature during a steaming cycle. When the water temperature
decreases below 190°F, the generator temperature adjustment circuit
turns ON the rear contactor, energizing the generator and fan heaters.
When the drain temperature increases above 150-160 F, the drain
temperature adjustment circuits causes the rear contactor to de-
energize, which turns OFF the fan heater, one 5.3 kW heater, and the
two 2.56 kW heaters. Thus, the two temperature control circuits work
together to regulate steam during cooking cycles.
Printed 4/90