Hitachi RAS-18LH2 Service Manual page 47

6. Service Operation Circuit
Use the service switch to select "Cooling" temporarily when the interior electric equipment has troubled.
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Setting the switch to "Cooling" causes continuous cooling room temperature control. To control the room
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temperature, turn on and off the disconnect switch. To protect the compressor, wait at least 3 minutes
before turning on again.
The fan speed is "MED".
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Does not operate is 12V is not generated in the control circuit.
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When the service switch is used for operation, each change switch is overridden.
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Setting the service switch to "Cooling" turns on the "Power relay".
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