Expansion Valve; Malfunction Hot Gas Solenoid, Condenser Pressure Regulating Valve, Or Quench Valve - Carrier Neos 100S Operation & Service Manual

INDICATION / TROUBLE
6.2.10

Expansion Valve

Low suction pressure with high
superheat
Low superheat and liquids
lugging in compressor
Fluctuating suction pressure
High superheat
6.2.11

Malfunction Hot Gas Solenoid, Condenser Pressure Regulating Valve, or Quench Valve

Valve does not function
properly
Valve shifts but refrigerant
continues to flow
Table 6–2 Mechanical Indications
POSSIBLE CAUSES
Low refrigerant charge
External equalizer line plugged
Broken capillary
Superheat setting too high
Superheat setting too low
External equalizer line plugged
Pin and seat of expansion valve eroded or held open by
foreign material
Improper bulb location or installation
Insulation missing from sensing bulb
Low superheat setting
Expansion valve setting
No power to valve
Improper wiring or loose connections
Valve improperly assembled
Coil or coil sleeve improperly assembled
Movement of plunger restricted due to:
a. Corroded or worn parts
b. Foreign material lodged in valve
c. Bent or dented enclosing tube
Foreign material lodged under seat
Defective seat
6-5
REFERENCE
SECTION
5.6.1
Repair
Repair
5.12.2
5.12.2
Repair
5.12
5.12
Replace
5.12.2
5.12.2
Check
Check
5.10
5.10
5.10
62-11848