SERVICING
53
NOTE:
The compressor may run backwards (noisy opera-
tion) for 1 or 2 seconds at shutdown. This is normal and
does not harm the compressor.
1. Install gauges and verify that the suction pressure drops
while the discharge pressure increases.
2. Listen for normal compressor sound levels. Reverse rota-
tion results in elevated or unusual sound levels.
3. Reverse rotation will result in substantially reduced amp
draw from tabulated values.
To correct improper rotation, switch any two power supply
leads at the outdoor unit contactor.
The 3 phase Scroll Compressors are direction of rotation sen-
sitive. They will rotate in either direction depending on the
phasing of the power. There is no negative impact on durabil-
ity caused by operating 3 phase compressors in reversed
rotation. The compressors internal protector will trip, de-en-
ergizing the compressor. Continued operation of 3 phase scroll
compressors with the rotation reversed will contribute to com-
pressor failure. All 3 phase scroll compressors should be
checked for correct phase rotation.
S-105A PISTON KIT CHART FOR ASC13,
GSC13, VSC13, GSC14, ASH13, GSH13,
VSH14, GSH14 UNITS
Air Conditioners
Orifice
Size
Heat Pumps
Orifice
Size
G/VSC130181A*
.055
G/VSH130181A*
.052
GSC130181B*
.055
GSH130181B*
.055
G/VSC130241A*
.059
G/VSH130191A*
.052
GSC130241C*
G/VSH130241A*
.061
AC30, ACNF24
.059
GSH130241B*
.061
AWB24/AWUF24
.059
G/VSH130251A*
.061
# All other ARI Matches
.061
G/VSH130301A*
.068
G/VSC130301A* / D*
GSH130301B*
.070
GSC130303A*
G/VSH130311A*
.065
AC36, ACNF30
.065
G/VSH130361A*
.073
AWB36, AWUF36
.068
GSH1303613A*/1B*
.082
# All other ARI Matches .065
G/VSH130421A*
.082
G/VSC130361A*
G/VSH130481A*
.084
GSC130363A* / B*
.071
GSH1304813A*/ 4A*
.084
AWB36, AWUF36
.071
G/VSH130601A*
.093
# All other ARI Matches .074
GSH1306013A*/ 4A*
.093
GSC130361B* / F*
.071
ASH130181A*
.052
G/VSC130421A*
.078
ASH130241A*
.062
G/VSC130481A
.082
ASH130301A*
.065
GSC130483A*/ 4A*
.082
ASH130361A*
.073
G/VSC130601A*
.093
ASH130421A*
.082
GSC130603A*/ 4A*
.093
ASH130481A*
.084
ASC130181A*
.055
ASH130601A*
.093
ASC130241A*
.061
GSH140361A*
.076
ASC130301A*
.065
GSH140421A*
.078
ASC130361A*
.071
GSH140481A*
.088
ASC130421A*
.078
ASC130481A*
.082
ASC130601A*
.093
GSC140181A*
.053
GSC140241A*
.061
GSC140301A*
.067
GSC140361A*
.074
GSC140421A*
.078
GSC140481A*
.084
GSC140601A*
.096
GSC140181B*
.055
GSC140241B*
.062
GSC140301B*
.067
GSC140361B*
.073
GSC140421B*
.080
S-105B THERMOSTATIC EXPANSION VALVE
The expansion valve is designed to control the rate of liquid
refrigerant flow into an evaporator coil in exact proportion to
the rate of evaporation of the refrigerant in the coil. The
amount of refrigerant entering the coil is regulated since the
valve responds to temperature of the refrigerant gas leaving
the coil (feeler bulb contact) and the pressure of the refrigerant
in the coil. This regulation of the flow prevents the return of
liquid refrigerant to the compressor.
The illustration below shows typical heat pump TXV/check
valve operation in the heating and cooling modes.
