McQuay MLCV Anleitung zur Fehlerbehebung PDF herunterladen (Seite 40)

7. General Troubleshooting Guide

By means of pressure readings

PRESSURE PROBABLE CAUSE

Data

Circuit

HIGH SIDE 1. Overcharged with refrigerant.

LOW SIDE 2. Non-condensable gases in refrigerant circuit

(eg.oil)

3. Obstructed air-intake / discharge.

4. Short circuiting of hot air at condensing unit.

HIGH SIDE 1. Poor compression / no compression

LOW SIDE ( compressor defective )

2. Check valve stick in open position.

3. Reversing valve leaking (for heatpump only).

HIGH SIDE 1. Undercharged with refrigerant.

LOW SIDE 2. Refrigerant leakage.

3. Air filter clogged / dirty (indoor unit)

4. Indoor fan locked (cooling)

5. Defective defrost control, outdoor coil freezed

up (heating)

6. Outdoor fan locked (heating)

HIGH SIDE 1. Outdoor fan blocked (cooling)

LOW SIDE 2. Outdoor coil dirty (cooling)

3. Indoor fan lock (heating)

4. Indoor filter clogged dirty (heating)

HIGH SIDE 1. Air intake temperature of indoor unit too high.

LOW SIDE

TOO LOW

TOO HIGH

NORMAL

A LITTLE

LOW

A LITTLE

HIGH

O. AIR COOLED MINI CHILLER

Model Board

AC40/50/58A/AR SZMC01

AC75/100/125B/BR

System Failure Mode

No Description Error Code Compressor Condenser 4WV Water LED

Display Fan Pump

1 Compressor overload CO X X X O B

2 Condenser fan overload CO X X X O B

3 Water pump overload PO X X X X B

4 Flow switch FL X X X X B

5 High pressure cut-off HP X X X O B

6 Low pressure cut-off LP X X X O B

X = Stop; O = Run; B = Blink

Error Code

Display Possible Causes

“CO” Compressor thermal relay trip

Terminal loose

“PO” Pump thermal relay trip

Terminal loose

“FL” Flow switch connection fault

Water flow wrong connection

Flow switch fault

“HP” Discharge pressure high

Overcharged

Coil dirty

Condenser fan fault

“LP” Suction pressure low

Undercharged/leak

Water flow rate too low

“E3” Antifreeze protection activated

Water flow rate too low

Model Board Handset

AC80/100/120/150C/CR MCH03 Chiller Panel

*Error is directly displayed on Chiller Panel’s LCD display panel.

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