Hitachi RAF-25FX8 Service Manual page 180

HOW TO OPERATE USING THE SERVICE SWITCH THE OUTDOOR UNIT
MODEL RAC-25FX8, RAC-35FX8
1. Turn off the power switch.
2. Remove the electrical box cover.
3. Turn on the power switch
4. After waiting for 30 seconds, push the service switch for a second.
LD303 (red) will light and the unit will operate in the forced cooling mode at this time.
Never operate the unit for
more than 5 minites.
(Cautions)
(1) If interface signal (DC 35V) terminals C and D are not connected when the outdoor unit is in forced cool mode,
the outdoor unit defect indicator (LD301) will blink 9 times during operation to indicate communication error.
(2) If checking is done with the compressor connector disconnected, the unit will stop and LD301 will blink 4 times.
Be sure to push the service switch for a second again to stop the forced cool operation.
HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY
1. Connect the large dia. pipe side and small dia. pipe side service valve using a pipe.
Connect the small diameter service
value and the large diameter service
valve using the reducing union and
copper pipe as shown on the right.
Charge refrigerant of 300g
after vacuuming (*1)
The operation method is the same as "How to operate using the connector to servicing the outdoor unit".
*1 The charging amount of 200g is equivalent to the load in normal operation.
Electrical box cover
Unit top cover
Outdoor unit
Compressor
Reversing
valve
Large dia. service valve
Reducing union
(2/8" and 3/8")
Copper pipe
(2/8")
Small diameter
service valve
– 198 –
Parts to be prepared
(1) Reducing union
2/8" (6.35 mm)
3/8" (9.52 mm)
(2) Copper pipe (2/8" and 3/8")
Do not operate for more than 5
minutes.