Hitachi RAF-25NH5 Instructions De Service page 310

OW TO OPERATE USING T E SERVICE SWITC T E OUTDOOR UNIT
ODEL RA -80QH5
1. Turn the Power switch off and then turn on again.
2. Remove the electrical parts cover.
3. Press the service switch for one second or more (wait for at least 20 seconds after turning the power source
switch on).
LD304 (red) will light and the unit will operate in the forced cooling mode at this time
Never operate the unit
in this state for more
than 5 minutes.
(Cautions)
(1) If interface signal (35V DC) terminals C and D are not connected when the outdoor unit service switch is used
for checking, the outdoor unit defect indicator (LD303) will blink 9 times after operation to indicate
communication error.
(2)
If you do this with the compressor connector in a removed state, LD301 will blink four times, and the unit will
not work.
Be sure to return the service switch to "normal" after checking with service operation is completed.
OW TO OPERATE T E OUTDOOR UNIT INDEPENDENTLY
1. Connect the large dia. pipe side and small dia. pipe side service valves 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 300g is equivalent to the load in normal operation.
※
All manuals and user guides at all-guides.com
※Check for each cycle.
Open the upper cover
Outdoor unit
Compressor
Reversing
valve
- 346 -
Service switch
(forced-cooling mode is set by
pressing for 1 second or
more, and stopped by pressing
again.)
FAN-HIC
SPM2B
SPM2A
ABS
Parts to be prepared
Reducing union
(1)
2/8" (6.35mm)
Large dia.service valve
3/8" (9.52mm)
Reducing union
Copper pipe (2/8" and 3/8")
(2)
(2/8" and 3/8")
Copper pipe
(2/8")
Small diameter
Do not operate for 5 minutes
service valve
or more