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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 Hig
h
A
Little Low
A
Little Hig
h
Normal
Probable cause
Data
Circuit
Pressure
Summary of Contents for A4MC 100ER
Page 1: ...Ceiling Concealed D Series ACC D2 2007 ACC 75 D DR ACC100 D DR Models ...
Page 50: ...48 Model AMC A4MC 75 100D ER Note All Dimension are in mm Outdoor Unit ...
Page 53: ...51 Model ACC 75 100D vs AMC A4MC 75 100D Cooling Only 10 WIRING DIAGRAMS ...
Page 54: ...52 Heat Pump Model ACC 75 100DR vs Model AMC A4MC 75 100ER ...