Hitachi RAC-18WPC, Service Manual, Page: 40 / 43

Cautions
1. Applying power directly to the outdoor unit will cause a rush current to stress the outdoor unit.
Therefore, if the indoor unit is not out of order, do not use the method descried in 2).
2. Before making the connections, be sure to turn off the breaker.
3. Do not under any circumstances run the product for more than 5 minutes.
4. Doing work with the compressor connector removed will cause the LD301 to blink 4 times.
It will not start.
5. For another test run, turn off the breaker and turn it back on. (The test switch is accepted only
once after power-on. After operation by remote control, it is not accepted.)
6. When the operation with the test switch is over, turn off the breaker and set the connectors back.
HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY
1. Connect the large dia. pipe side and small dia. pipe side service valve using a pipe.
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”)
Connect the small diameter service
valve 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 00g is equivalent to the load in normal operation.
Do not operate for more than 5
minutes
Large dia. service valve
Reducing union
(2/8” and 3/8”)
Copper pipe
(2/8”)
Small diameter
service valve
Reversing
valve
Compressor
Outdoor unit
RAC-18/25WP
3
C
40