Hitachi RAC-8CH9 Service Manual page 49

6. Service Operation Circuit
Use the service switch to select "Cooling" temporarily when the interior electric equipment has troubled.
G
Setting the switch to "Cooling" causes continuous cooling room temperature control. To control the room
G
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".
G
Does not operate is 12V is not generated in the control circuit.
G
When the service switch is used for operation, each change switch is overridden.
G
Setting the service switch to "Cooling" turns on the "Stick relay" and "Power relay".
G
Micro computer
(AX-3U)
FORCE COOL 42
5V
R606
0V
– 52 –
Cool
Normal