V–57
Ground fault check
Wire break or disconnection check
Measure resistance on the
terminal board of each unit.
Outdoor unit
Outdoor unit
Indoor unit 1
Indoor unit 1 Indoor unit 2 Indoor unit 3
Indoor unit 4
Ground
Ground Ground Ground
Ground
Ground Ground
Ground
Ground
Ground
Remote controller
Remote controller
Remote controller
Indoor unit 2 Indoor unit 3 Indoor unit 4
Measure resistance between terminal board 1 and terminal board 2.
Standard: Approx. 75 to 100 (with one terminal resistor present)
Short circuit check
Measure resistance between the ground screw and terminal board 1.
Measure resistance between the ground screw and terminal board 2.
Standard:
Measure resistance between the ground screw and terminal board 1.
Measure resistance between the ground screw and terminal board 2.
Standard:
If there is resistance, a sensor ground fault has occurred.
Outdoor unit
Indoor unit 1 Indoor unit 2
Indoor unit 3 Indoor unit 4
Ground
Ground
Ground
Outdoor unit
(Indoor unit)
Sensor
Example: A wire break or disconnection occurs at x (with one ou
tdoor unit terminal resistor present).
The resistance value for (1), (2), and (5) is approx. 75 to 100 .
The resistance value for (3) and (4) is .
* If the resistance for (5) is , check the terminal resistor for the outdoor unit control board,
and check wiring between the outdoor unit control board and the outdoor unit terminal board.
Sensor ground fault check (* Sensor ground faults will also result in communication faults.)
· Sensor type (thermistor) ground fault check (turn off power for units)
For each of the indoor/outdoor units connected by the operation cable, measure the
resistance between the sensor wiring and ground screw for both of the sensor wires
and ground screws.
Indoor/outdoor control wire
Indoor/outdoor control wire
Indoor/outdoor control wire
Ground Ground Ground
Ԝ
GHPtroubleshooting.indbV‒57GHPtroubleshooting.indbV‒57 2012/11/2611:20:262012/11/2611:20:26
To Next Page
Loading...
