Tecumseh AH5540E Service Handbook page 26

18
SERVICE HANDBOOK
Minimum starting voltage for the compressor when it is attempting to start (locked
rotor) is listed in Table 3-1.
• Unequalized system pressure: Head and suction pressures must be equal and not
more than the pressures listed in Table 3-2. Refrigeration metering device (cap tube or
TX valve) should equalize system pressure within 3 minutes. Unequal system pressure
may be caused by excessive refrigerant charge, short cycling thermostat, or system
restriction.
• Circuit breaker or fuse trips: Branch circuit fuses or circuit breakers sized too small will
cause nuisance tripping (see "Fuse and Circuit Breaker Sizing" on page 27). If the fuse
or circuit breaker trips, see "Identifying Compressor Electrical Problems" on pages 40-
41 for electrical troubleshooting techniques.
• Electrical components: A failed run capacitor will not allow the compressor to start,
and it will trip the thermal protector. See "Identifying Compressor Electrical Problems"
on pages 40-41 for electrical troubleshooting techniques.
Table 3-1: Minimum Starting Voltage
Serial Label Voltage
115
208
230
208/230
265
Table 3-2: Maximium Equalized Pressures
Refrigerant
R-410A
R-22
R-407C
R-134a
Pressures are at 90°F Ambient
Min. Voltage for Start
103
188
207
198
239
Maximium Equalized Pressures
275 psig
170 psig
180 psig
104 psig