Electronic Expansion Valve Check Procedure; Procedure For Checking Fan Motors In Indoor Units - Hitachi RCI-1.0FSR Service Manual

8 Troubleshooting

Electronic expansion valve check procedure

8.1 Electronic expansion valve check procedure
Valve position
Locked fully closed Check the temperature of the piping in the heating process. Failure of the temperature to rise indicates a fault.
Locked slightly open The following conditions indicate a fault:
Where the freeze protection thermistor temperature is lower than the intake air temperature.
Locked fully open
Where the unit being inspected stops and other units continue operating in cooling mode.

8.2 Procedure for checking fan motors in indoor units

Name and abbreviation of the cable colours used:
Black Brown
BLK BRN
Indoor units Power output
RCI-1.0FSR
RCI-1.5FSR
RCI-2.0FSR
RCI-2.5FSR
RCI-3.0FSR
RCI-4.0FSR
RCI-5.0FSR
RCI-6.0FSR
RCIM-0.4FSRE
RCIM-0.6FSRE
RCIM-0.8FSRE
RCIM-1.0FSRE
RCIM-1.5FSRE
RCIM-2.0FSRE
RCIM-2.5FSRE
RCD-0.8FSR
RCD-1.0FSR
RCD-1.5FSR
RCD-2.0FSR
RCD-2.5FSR
RCD-3.0FSR
RCD-4.0FSR
RCD-5.0FSR
RCD-6.0FSR
RPC-3.0FSRE
RPC-4.0FSRE
RPC-5.0FSRE
RPC-6.0FSRE
280 SMGB0137 rev.0 - 05/2021
Red Yellow
RED YEL
Wiring diagram
57 W DC motor
127 W DC motor
57 W DC motor
57 W
DC Motor
55 W
35 W x 2
55 W x 2
145 W
Electronic expansion valve
Green Blue Grey
GRN BLU GRY
Cable number
BLK1-2RED
RED2-3YEL
YEL3-4GRY
RED2-6WHT
Orange White
ORN WHT
Resistance (Ω)
— —
— —
— —
— —
32.10
24.50
24.50
44.70
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