Service Functions; Troubleshooting - Mitsubishi Electric SUZ-KA25VA Service Manual

SUZ-KA50VA/VA /VAR2.TH SUZ-KA60VA/VA
1
Sensor
Discharge temperature thermistor
Indoor pipe temperature thermistor
Defrost thermistor
Fin temperature thermistor
Ambient temperature thermistor
Outdoor heat exchanger temperature
11

SERVICE FUNCTIONS

SUZ-KA25VA(H)
CHANGE IN DEFROST SETTING
<JS> When the JS wire of the outdoor Inverter P.C. board is cut/ soldered, the defrost finish temperature is changed.
(Refer to 12-6-1 SUZ-KA25/35VA(H).TH)
(Refer to 12-6-3 SUZ-KA25/35VA(H)R1.TH)
Jumper wire
soldered
(Initial setting)
JS
none
(cut)
Serial No.
12

TROUBLESHOOTING

SUZ-KA25VA(H)
SUZ-KA50VA
12-1. Cautions on troubleshooting
1. Before troubleshooting, check the following:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care the following during servicing.
1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and turn off the breaker.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic
control P.C. board.
3) When removing the electrical parts, be careful of the residual voltage of smoothing capacitor.
4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp is blinking on and off to indicate an abnormality. To make sure,
check how many times the abnormality indication is blinking on and off before starting service work.
2) Before servicing check that the connector and terminal are connected properly.
3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and
the components for bursting and discoloration.
4) When troubleshooting, refer to 12-2. and 12-3.
1
Purpose
Protection
Cooling: Coil frost prevention
Heating: High pressure protection
Heating: Defrosting
Protection
Protection
Cooling: High pressure protection
SUZ-KA35VA(H)
SUZ-KA25VA SUZ-KA25VAH
5
8 15
—
SUZ-KA35VA(H)
SUZ-KA60VA
Lead wire
/VAR2.TH SUZ-KA71VA/VA
Compressor LEV
Defrost finish temperature
SUZ-KA35VA
8 10
13
— —
SUZ-KA71VA
Housing point
58
.TH
1
Actuator
4-way
Outdoor
valve
fan motor
SUZ-KA35VAH
13
15
~67P00330 68P00331~
10
13