Before Test Run - Mitsubishi Electric PUHZ-W50VHA Technical Manual

2.7. Wiring specifi cation of External output / External input
Locally supplied parts
Item
External output function
External input function

3. Before test run

3.1. Check
After completing installation and the wiring and piping of the local application and outdoor units, check for refrigerant leakage,
looseness in the power supply or control wiring, wrong polarity, and no disconnection of one phase in the supply.
Use a 500-volt megohmmeter to check that the resistance between the power supply terminals and ground is at least 1.0MΩ.
Warning:
Do not use the system if the insulation resistance is less than 1.0MΩ.
Caution:
Do not carry out this test on the control wiring (low voltage circuit) terminals.
3.2. Self-check
1Turn on the power.
2Press [CHECK] button twice.
3Press [CHECK] button twice to fi nish self-check.
ACHECK button BIC : FTC unit OC : Outdoor unit CCheck code
Check code Symptom
P1 Flow water (TH1) sensor error
P2 Refrigerant liquid Pipe (TH2) sensor error
P6 Freezing/Overheating protection operation
Fb FTC unit control system error (memory error, etc.)
E0~E5 Signal transmission failure between remote controller and FTC.
E6~EF Signal transmission failure between outdoor unit and FTC.
– – – – No trouble generated in the past.
FFFF No corresponding unit
U*, F* Outdoor unit failure. Refer to the outdoor unit wiring diagram.
For description of each LED(LED1~5) provided on the FTC, refer to the following table.
LED 1 (Power for microcomputer)
LED 2 (Power for remote controller)
LED 3(Communication between FTC
and outdoor unit)
LED 4
LED 5
Name
External output signal wire
Display lamp, etc.
External input signal wire
Switch
Indicates whether control power is supplied. Make sure that this LED is always lit.
Indicates whether power is supplied to the remote cotroller. This LED lights only in
the case of the FTC unit which is connected to the outdoor unit refrigerant address "0".
Indicates state of communication between the FTC and outdoor unit. Make sure that
this LED is always blinking.
—
—
Model and specifi cations
Use sheathed vinyl coated cord or cable.
Max. 50m
Wire type : CV, CVS or equivalent
Wire size : Stranded wire 0.5mm
Solid wire: {0.65mm to {1.2mm
Non-voltage Contact AC220-240V (DC30V), 1A or less
*Connect the surge absorber according to the load at site.
Use sheathed vinyl coated cord or cable.
Max. 10m
Wire type : CV, CVS or equivalent
Wire size : Stranded wire 0.5mm
Solid wire : {0.65mm to {1.2mm
Non-voltage "a" contact signals
Remote switch : minimum applicable load DC 12V, 1mA
65
2 2
to 1.25mm
2 2
to 1.25mm
ERROR CODE
TEMP. ON/OFF