Scotsman C1448R Instrukcja Użytkownika Pobierz pdf (Strona 70)

Harvest assist solenoid

1. Test using the controller’s indicator lights. Push and release the Harvest button. The Hot

Gas indicator light will be on. At the same time the Harvest Assist Solenoid will be powered. If

the ice on the evaporator is thin, the solenoid will extend. If the ice is nearly full sized, the

solenoid will press against the ice until it releases from the evaporator, then the solenoid probe

will extend. If the probe extends, the solenoid is good. If not, do a voltage check. Unplug the

high voltage harness from the harvest assist solenoid. Attach a voltmeter to the harness

connector. Push and release the Harvest button. There should be full voltage at the connector.

If there is and the solenoid does not extend, replace the solenoid. If full voltage is not present,

check voltage at the controller. If there is no voltage, check voltage from the controller to

ground. The hot gas / harvest assist pin is 5. If there is voltage from that pin to ground, but low

voltage at the solenoid harness connection, the harness has a broken wire or poor connection

and must be replaced. If the voltage to ground is low, the controller should be replaced.

Note: The coil of this valve is internally rectified, will normally show infinite resistance when tested with

an ohmmeter.

Hot Gas or Vapor Valve

1. Test using the controller’s indicator lights. If

the unit is running, or has been off for more

than 4 minutes, push and release the Harvest

button. The Hot Gas indicator light will be on

and the hot gas valve will be energized. The compressor will force discharge gas into the

evaporator inlet, warming it. If the evaporator inlet does not warm up, do a voltage check. Shut

the unit off by holding the Off button in for 3 seconds. Unplug the high voltage harness from

the hot gas solenoid. Attach a voltmeter to the harness connector. Wait 4 minutes. Push and

release the Harvest button. There should be full voltage at the connector. If there is and the

solenoid does not open, replace the solenoid coil. If full voltage is not present, check voltage at

the controller. If there is no voltage, check voltage from the controller to ground. The hot gas

pin is 5. If there is voltage from that pin to ground, but low voltage at the solenoid harness

connection, the harness has a broken wire or poor connection and must be replaced. If the

voltage to ground is low, the controller should be replaced.

2. Test with an ohmmeter. Disconnect electrical power. Unplug high voltage harness from hot

gas or vapor valve. Measure resistance of hot gas or vapor valve coil. If open, replace the coil.

September 2006 Page 70

Test Procedures - Loads

This light will be ON during harvest.

Both the Hot Gas Valve coil and the

Harvest assist solenoid coil will have

power when this light is ON.

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Scotsman C1448R Instrukcja Użytkownika Strona 70