6-5 62-11848
6.2.10 Expansion Valve
Low suction pressure with high
superheat
Low refrigerant charge 5.6.1
External equalizer line plugged Repair
Broken capillary Repair
Superheat setting too high 5.12.2
Low superheat and liquids
lugging in compressor
Superheat setting too low 5.12.2
External equalizer line plugged Repair
Pin and seat of expansion valve eroded or held open by
foreign material
5.12
Fluctuating suction pressure
Improper bulb location or installation 5.12
Insulation missing from sensing bulb Replace
Low superheat setting 5.12.2
High superheat Expansion valve setting 5.12.2
6.2.11 Malfunction Hot Gas Solenoid, Condenser Pressure Regulating Valve, or Quench Valve
Valve does not function
properly
No power to valve Check
Improper wiring or loose connections Check
Valve improperly assembled 5.10
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
Valve shifts but refrigerant
continues to flow
Foreign material lodged under seat 5.10
Defective seat 5.10
Table 6–2 Mechanical Indications
INDICATION / TROUBLE POSSIBLE CAUSES
REFERENCE
SECTION
To Next Page
Loading...
