McQuay M5MAC Anleitung zur Fehlerbehebung PDF herunterladen (Seite 58)

General Troubleshooting Guide

By means of pressure readings.

Pressure Probable Cause

Too Low

A Little Low

Normal

A Little High

Too High

High Side

Low Side

1. Overcharged with refrigerant.

2. Non-condensable gases in refrigerant circuit

(eg. Oil)

3. Obstructed air-intake / discharge.

4. Short circuit of hot air at condensing unit.

High Side

Low Side

1. Poor compression / no compression

(compressor defective).

2. Check valve stick in open position.

3. Reversing valve leaking (for heatpump only).

High Side

Low Side

1. Undercharged with refrigerant.

2. Refrigerant leakage.

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

4. Indoor fan locked (cooling).

5. Defective defrost control, outdoor coil freeze

up (heating).

6. Outdoor fan locked (heating).

High Side

Low Side

1. Outdoor fan blocked (cooling).

2. Outdoor coil dirty (cooling).

3. Indoor fan locked (heating).

4. Indoor filter clogged dirty (heating).

High Side

Low Side

1. Air intake temperature of indoor unit too high.

Data

Circuit

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McQuay M5MAC Anleitung zur Fehlerbehebung Seite 58