Air Conditioning & Heat Pump - Cooling; Low Suction - Low Head Pressure; High Suction - Low Head Pressure; Low Suction - High Head Pressure - Bard MULTI-TEC W18AAPA Service Instructions Manual

T
roubleshooTing The
AIR CONDITIONING AND HEAT PUMP — COOLING
LOW SUCTION — LOW HEAD
PRESSURE
1. Restricted ��� over indoor coil.
2. Defective indoor fan motor.
3. Low indoor temperature
4. Iced indoor coil.
5. Restricted liquid line, dryer, metering device, etc.
6. Low charge.
7. Low ambient entering air temperature. (Low entering
water temperature to water coil.)
HIGH SUCTION — LOW HEAD
PRESSURE
1. Defective or broken valves.
2. IPRV valve open.
3. Defective reversing valve.
HEAT PUMP HEATING
—
LOW SUCTION — LOW HEAD PRESSURE
1. Restricted ��� through outdoor coil. (Restricted water
�� through water coil.)
2. Defective outdoor motor. (Defective water pump.)
3. Low outdoor air temperature. (Low water
temperature.)
4. Frozen outdoor coil. (Frozen water coil.)
5. Restricted liquid line, dryer, metering device, etc.
6. Low charge.
7. Low indoor air temperature.
HIGH SUCTION — LOW HEAD
PRESSURE
1. Defective or broken valves.
2. IPR valve open.
3. Defective reversing valve.
M
echanical
LOW SUCTION — HIGH HEAD
PRESSURE
1. Partial restriction and then overcharged.
HIGH SUCTION — HIGH HEAD
PRESSURE
1. High entering outdoor air temperature. (High entering
water temperature.)
2. Low ��� outdoor coil. (Low water �� .)
3. Overcharged.
4. Air in system.
5. Restricted outdoor coil. (Restricted water coil.)
6. High indoor air temperature.
 Water source heat pump.
LOW SUCTION — HIGH HEAD
PRESSURE
1. Partial restriction and then overcharged.
HIGH SUCTION — HIGH HEAD
PRESSURE
1. High entering outdoor air temperature. (High entering
water temperature.)
2. Low indoor ��� .
3. Overcharged.
4. Air in system.
5. Restricted air coil.
6. High indoor air temperature.
 Water source heat pump.
s
ysTeM
Manual
Page
2100-479
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