McQuay M5MAC Guía para resolver problemas descargar pdf (Pagina 82)

McQuay Service Guide Book

81

7.3 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 defrosts 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

1 2 ... 77 78 79 80 81 82 83 84 85 86 87 88 89 90

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