Tecumseh AH5540E - 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 Min. Voltage for Start
115 103
208 188
230 207
208/230 198
265 239
Table 3-2: Maximium Equalized Pressures
Refrigerant Maximium Equalized Pressures
R-410A 275 psig
R-22 170 psig
R-407C 180 psig
R-134a 104 psig
Pressures are at 90°F Ambient