Mitsubishi Heavy Industries SRK-ZSP-S Service Support Handbook page 25

Type B - FDC VN, VS, VNA, VSA, VNX, VSX & KX6 Outdoor Units
Testing Method
1) Setup Procedure
a) Turn off the power to the system.
b) Remove the terminal cover from the compressor and disconnect the wires U, V and W.
c) Connect the disconnected wires to the inverter checker U (Red), V (White) and W (Black).
d) Switch JSW10-4 on the outdoor units inverter PCB ON.
Operation for Judgement
2) a) Turn on the power to the system.
b) About 15seconds after the power was switched on the LEDs should start to cycle 5seconds ON/OFF
c) Check the on/off status of the 6 LED's of the inverter checker.
d) Judge the Inverter PCB by the ON/OFF status of the 6 LED's of the inverter checker
e) Switch OFF JSW10-4 on the inverter PCB once test has been completed.
Type C - SRC & FDC VNP Outdoor Units
Testing Method
3) Setup Procedure
f) Turn off the power to the system.
g) Remove the terminal cover from the compressor and disconnect the wires U, V and W.
h) Connect the disconnected wires to the inverter checker U (Red), V (White) and W (Black).
i) With the mains power OFF connect a short connector to CNROM on the PCB linking
pins 2 and 3.
4) Operation for Judgement
a) Turn on the power to the system.
b) About 15seconds after the power was switched on the LEDs should start to cycle 5seconds ON/OFF
c) Check the on/off status of the 6 LED's of the inverter checker.
d) Judge the Inverter PCB by the ON/OFF status of the 6 LED's of the inverter checker
e) Power off and remove the short connector from CNROM once test has been completed.
Test Procedure – Using an Inverter Checker
SHORT
CONNECTOR