McQuay M5HDC Especificaciones descargar pdf (Pagina 37)

M5HDC-2010

Troubleshooting

Diagnostic Guidelines

No Cooling / Heating

Unit fail to start

Check power supply

- voltage

- phase

- frequency

Check settings of remote control box

Compressor fails to start

Check circuit breake & fuse

Check power source cord

Fan fails to start

Fan Motor Capacitor defective

Loose Connections,

Contactors

Irregular motor resistance (

Ω

)

& insulation (M

Ω

)

Replace Fan Motor

Compressor Motor damaged ( to replace compressor)

Thermostat setting too high

Protection Device Actuated

Reset

Compressor locked (to replace compressor)

Voltage supply not within range

Check motor resistance (

Ω

) and insulation (M

Ω

)

Compressor

Capacitor Defective

Loose Connections,

Improper wiring

Regular but fails

to start

Irregular

By means of pressure reading:

Pressure

Data

Circuit

Too low

A little low

Normal

A little high

Too high

Probable cause

High side

Low side

1. Overcharged with refrigerant.

2. Non-condensable gases in refrigerant circuit (e.g. air)

3. Obstructed air-intake / discharge.

4. Hot air short circuiting in outdoor unit.

High side

Low side

High side

Low side

High side

Low side

High side

Low side

1. Air intake temperature of indoor unit too high.

1. Poor compression / no compression

(compressor defective)

2. Reversing valve leaking.

1. Undercharged with refrigerant.

2. Refrigerant leakage.

3. Air filter clogged / dirty (indoor unit).

4. Indoor fan locked / seized.

5. Defective defrost control, outdoor coil freeze up (heating).

6. Outdoor fan locked / seized (heating).

1. Outdoor fan blocked (cooling).

2. Outdoor coil dirty (cooling).

3. Indoor fan locked / seized (heating).

4. Indoor air filter clogged / dirty (heating).

5. Non-condensable gases in refrigerant circuit (e.g. air)

By Means Of Diagnosis Flow Chart

Generally, there are two kinds of troubles, i.e. starting failure and insufficient cooling / heating.

“Starting Failure” iscaused by electrical defect while “Insufficient Cooling / Heating” is caused

by improper application or defects inrefrigerant circuit.

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 43 44

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McQuay M5HDC Especificaciones Pagina 37

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