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Hitachi RAS-09GH4 - Service Operation Circuit Function

Hitachi RAS-09GH4
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6. Service Operation Circuit
Use the service switch to select “Cooling” temporarily when the interior electric equipment has troubled.
Setting the switch to “Cooling” causes continuous cooling room temperature control. To control the room
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”.
Does not operate is 12V is not generated in the control circuit.
When the service switch is used for operation, each change switch is overridden.
Setting the service switch to “Cooling” turns on the “Stick relay” and “Power relay”.
Micro computer
(AX-3U)
FORCE COOL 42
5V
0V
R606
Cool
Normal

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