McQuay M5LCX Spécifications télécharger pdf (Page 40)

Diagnostic Guidelines

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

●

1. Poor compression / no compression (compressor

defective)

2. Reversing valve leaking.

High side

Low side

●

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).

High side

Low side

●

● 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)

High side

Low side

●

1. Air intake temperature of indoor unit too high.

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McQuay M5LCX Spécifications Page 40

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