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8. SPECIAL PRECAUTIONS WHEN SERVICING THE UNIT
Models : GRV227M3C5, GRV340M3C5
IMPORTANT!
For your personal safety, be sure to read
and understand the following precautions
before servicing.
WARNING
Injuries can occur from burns or inhalation of
toxic gas if servicing is performed while
refrigerant remains in the refrigeration circuit.
This servicing includes disassembling brazed
tubing connections and removing any
refrigeration parts or components.
● To avoid risk of injury when servicing the outdoor unit
(for instance, when replacing the compressor or
repairing a refrigerant leak), follow the procedure
below for the refrigerant circuits of unit A
and unit B.
— Procedure —
8-1. Blue/green connector
attachment for servicing
8-1-1.
Confirm mains power is switched OFF, then
disconnect the connectors (GRN/GRN) to
separate A and B. Then connect A connector
(GRN) with connector C (BLU). (Fig.9-1)
8-1-2.
Provide a disconnect switch to the 3p terminal
plate. (Figs.9-2 and 9-3)
8-1-3.
Turn the disconnect switch ON to supply power
(single-phase, 220-240 V) to the outdoor unit.
This makes it possible to force open two
solenoid valves (SVA and SVB) in the
refrigeration circuit. (Figs.9-2 and 9-3)
IMPORTANT!
The procedure given in "8-2" to "8-5" below
must be carried out with the two solenoid
valves SVA and SVB open.
Before
• Condition at shipping
• Condition for operation
After
• Condition at servicing
(Procedure "9-2" ~ "9-5")
33
GRN
A
B
BLU
C
4
5
8
Terminal plate
: CONNECTOR
B
GRN
BLU
C
A
4
5
8
Terminal plate
Fig.9-1
Fig.1
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