McQuay MLCV Guía para resolver problemas descargar pdf (Pagina 51)

Roof Top Unit : Troubleshooting for optional Global Remote Controller

Before you ask for repair service, check the following points

State of Machine Remote Controller Cause Troubleshooting

(Special Order)

It does not run “ON-OFF” display is not Power failure Press the switch (ON) button after power

light up. No display restoration

appears even when the The power supply is turned OFF Turn the power supply ON

(ON/OFF) button is The fuse in the power supply is gone Replace fuse

pressed The earth leakage breaker is gone Put in the earth leakage breaker.

The wiring phase of power supply is Modify the wiring phase of power supply

mistaken

Air flows out The liquid crystal Improper temperature adjustment After checking the set temperature and inlet

but it does not display shows that it is temperature adjust thermostat (23WA)

cool enough in the state of operation The filter is filled with dust and dirt. Clean up the filter

There are some obstacles at the air Remove the obstacle

inlet and outlet of the units

Windows and doors are open Close the windows and doors

Cool air does not The liquid crystal The restart-preventing circuit is in Wait for a while

come out display shows that operation for 3 minutes (To protect the compressor, a 3-minute restart-

it is in operation preventing circuit is built into the unit.

Therefore, there are occasions sometimes

when the compressor does not start running

immediately. There are cases when it does not

run for as long as 3 minutes.)

Fan runs but compressor does not The set temperature of thermostat is For temperature control, decrease the set

run excessively high for cooling temperature at cooling.

The room temperature is excessively Can not be operated as it is out of temperature

low for cooling control range.

Compressor run but stops Air outlet and inlet are blocked Remove blocking matter

immediately

Water or steam is discharged from At cooling, water which places to It is not a breakdown.

the unit. cooling piping and pipng connection Please use it as it is

part drops

8. Modification to Auto Restart

Auto Restart Feature

Modification on controller board to have unit restart after power failure at default

setting:

Indoor Temp. Set Temp. Fan Speed Mode

Cooling All Temp. 24°C High Cool

model

Heatpump > 20°C 24°C High Cool

model < 20°C 20°C High Heat

I) WM 10/15DR & WM 20/25CR :

a) For challenger C2.2 PCB,

To add a 10k Ohm 5% Carbon, 1/4 W or higher resistor diagonally at S1 On/Off

Switch Board “CHAL2F1”

Front View Reverse View

b) For challenger C2.4 PCB,

To solder a 10k Ohm 5% Carbon, 1/4 W or higher resistor diagonally at S1 On/Off

Switch Board “C2D03F1”

Front View Reverse View

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McQuay MLCV Guía para resolver problemas Pagina 51

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