Remote Controller Operation Problems And Solutions; Test Operation (Read Operation Manual As Well) - Mitsubishi Electric PFD-P250VM-E Installation Manual

8. Remote Controller Operation Problems and Solutions

Phenomenon
Not appear " " mark on MA remote
controller display (MA dose not receive
the power supply)
Not disappear of "HO"
Appear " " mark but hot operated.
Operates or stops the unit without push
the remote controller button

9. Test Operation (read OPERATION MANUAL as well)

• After completing installation of the indoor and outdoor units, piping, and wiring, check the power supply, and check for refrigerant leaks, wiring mistakes, loose trans-
mission lines, and incorrect polarity.
• Using a DC500 V Mega, check that the resistance between the power supply terminal block and earth is 1.0 MΩ or more. Do not operate if this resistance is less than
1.0 MΩ.
* Do not measure the resistance of transmission lines.
• Refer to the following Test Run Procedure.
• Check functions as follows when using external I/O.
Test Run Procedure
Turn main power supply on before 12 hours or more.
→ Ready for operation in approximately one minute. Leave for 12 hours or more (with outdoor unit compressor crankcase heater ON).
1 Set Normal/Local switch of indoor unit to local.
2 Start test run by the remote controller.
→ Check that the indoor fan and outdoor unit operate normally.
→ Check for piping and wiring mistakes.
3 Stop the unit by the remote controller.
→ Test run complete.
4 Set indoor unit Normal/Local switch of indoor unit to Normal.
→ Check that the Normal/Local switch is set to Normal after test run.
Notes: 1 An error code will be appeared on the remote controller if the Fault lamp on the indoor unit is lit during test run. Refer to the Outdoor Units Installation Manual
for details of error codes.
2 Set DIP SW as following to ON if operation cannot be continued at low-load during test run. Always set DIP SW as following to OFF after completing test run
(change the switch setting only while power is OFF). <YGM model: DIP SW 5-4, YHM model: DIP SW4-5>
• Check functions as follows when using external I/O.
• External input function check
Item Operation details
Start/Stop Operate from external input.
1
• External output function check
Item Operation details
Operate (Stop) air-conditioner
1 Operation status
from remote controller.
2 Fault Stop air-conditioner at fault.
Cause
• Power failure of indoor unit
• Power failure of outdoor unit
• Over connection of MA remote controller (Max. 2 remote
controller)
• Transmission line connects to TB7 of outdoor unit (Should
be connected to TB3)
• MA remote controller connects to TB5 of indoor unit (Should
be connected to TB15)
• MA remote controller line is shorted or broken.
• Power supply line or transmission line is shorted or broken.
• Blow out fuse on indoor control board.
• Power failure of outdoor unit
• MA setting is "Sub"
Main setting: SW1 ON
Sub setting: SW1 OFF
• MA remote controller connects to TB5 of indoor unit (Should
be connected to TB15)
• Transmission line connects to TB7 of outdoor unit (Should
be connected to TB3)
• Transmission line is shorted, broken or connection failure.
• Blow out fuse on indoor control board.
• Timer operation with remote controller
• Operation with external I/O controller
Operation procedure
Check details
Air-conditioner operates or stops.
Remote controller display changes.
Check details
Device connected to output termi-
nal responds.
Check specified number air-condi-
tioner.
The power will not be supplied to MA remote controller after
finishing the initial mode correctly.
"HO" is flashing during the initial mode. (Max. 20sec.)
The units cannot operate if transmission line is incorrect.
Measures required
• Check connection of Start/Stop input terminal.
• Check SW1 - 10 are OFF.
• Check SW3 - 8 are ON.
• Check the Normal/Local switch is set to Normal.
Measures required
• Check connection of output terminal.
Description
15