McQuay M4MC Spezifikationen Seite 58

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Diagnostic Guidelines
By means of pressure readings:
High
side
Low side
Overcharged with refrigerant.
Non-condensable gases in refrigerant circuit
(e.g. air)
Obstructed air-intake / discharge.
Hot air short circuiting in outdoor unit.
High
side
Low side
Poor compression / no compression
(compressor defective)
Reversing valve leaking.
High
side
Low side
Undercharged with refrigerant.
Refrigerant leakage.
Air filter clogged / dirty (indoor unit).
Indoor fan locked / seized.
Defective defrost control, outdoor coil freeze up
(heating).
Outdoor fan locked / seized (heating).
High
side
Low side
Outdoor fan blocked (cooling).
Outdoor coil dirty (cooling).
Indoor fan locked / seized (heating).
Indoor air filter clogged / dirty (heating).
Non-condensable gases in refrigerant circuit
(e.g. air)
High
side
Low side
Air intake temperature of indoor unit too high.
Too Low
Too High
A Little Low
A Little High
Normal
Probable cause
Data
Circuit
Pressure
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