How To Operate Using The Service Switch The Outdoor Unit; How To Operate The Outdoor Unit Independently - Hitachi RAS-18FH6 Service Manual

HOW TO OPERATE USING THE SERVICE SWITCH THE OUTDOOR UNIT

MODEL RAC-18YH6, RAC-25YH6
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 minutes.
Service switch
(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.
LD303
LD302
MAIN P W B
LD301
HIC
Outdoor unit
Compressor
Large dia. service valve
Reversing
valve
Small diameter
service valve
– 85 –
SERVICE SWITCH
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")
Reducing union
(2/8" and 3/8")
Copper pipe
(2/8")
Do not operate for more than 5
minutes