GSZH5 Service Manual

99
SERVICING
Model Cur. Rev Piston Prev. Rev Piston
G/VSZ140181 LA .032 KF .039
G/VSZ140241 LA .047 KH .047
G/VSZ140301 KG .052 KF .052
G/VSZ140361 KE .059 LA .059
G/VSZ140421 KE .061 KD .061
G/VSZ140481 KF .065 KE .065
G/VSZ140491 KE .065 KD .065
G/VSZ140601 KE .065 KD .065
Model Cur. Rev Piston Prev. Rev Piston
ASZ140181 KE .039 KD .039
ASZ140241 KD .047 KC .047
ASZ140301 KD .052 KC .052
ASZ140361 KD .059 KC .059
ASZ140381 AC .059 n/a .059
ASZ140421 KD .061 KC .061
ASZ140481 KD .065 KC .065
ASZ140491 KD .065 KC .065
ASZ140601 KC .065 KB .065
Model Cur. Rev Piston Prev. Rev Piston
ANZ140181 AE .039 AD .039
ANZ140241 AD .047 AA .047
ANZ140301 AE .052 AD .052
ANZ140361 AD .059 AC .059
ANZ140421 AD .061 AC .061
ANZ140481 AD .065 AC .065
ANZ140491 AD .065 AC .065
ANZ140601 AC .065 AB .065
Pistons Used in Outdoor Heat Pump Coils
Goodman 14 SEER Heat Pumps
Amana 14 SEER Heat Pumps
Amana 14 SEER Heat Pumps
CAUTION





5. Run system at least 10 minutes to allow pressure to
stabilize.
6. For best results, temporarily install a thermometer on
the liquid line at the liquid line service valve and 4-6”
from the compressor on the suction line. Ensure the
thermometer makes adequate contact and is insulated
for best possible readings. Use liquid line temperature
to determine sub-cooling and vapor temperature to
determine superheat.

at the suction line service valve. Ensure the

for best possible readings.
7. Refer to the superheat table provided for proper system
superheat. Add charge to lower superheat or recover
charge to raise superheat.
SUPERHEAT FORMULA = SUCT. LINE TEMP. - SAT.
SUCT. TEMP.
EXAMPLE:
a. Suction Pressure = 143
b. Corresponding Temp. °F = 50
c. Thermometer on Suction Line = 61°F
To obtain the degrees temperature of superheat, subtract
50.0 from 61.0°F.
󰀨
fall in the ± range of allowable superheat.
Subcooling on Expansion Valve System
1. Purge gauge lines. Connect service gauge manifold
to base-valve service ports. Run system at least 10
minutes to allow pressure to stabilize.
2. Clamp a pipe clamp thermometer on the liquid line
near the liquid line service valve and 4-6” from the
compressor on the suction line.
a. Ensure the thermometer makes adequate contact to
obtain the best possible readings.
b. The temperature read with the thermometer
should be lower than the saturated condensing
temperature.
3. 󰀨
condensing temperature and the liquid line temperature
is the liquid Subcooling value.
4. TXV-based systems should have a Subcooling value of
8°F +/- 1°F.
5. Add refrigerant to increase Subcooling and remove
refrigerant to decrease Subcooling.

1. Remove the remote bulb of the expansion valve from
the suction line.
2. Start the system and cool the bulb in a container of
ice water, closing the valve. As you cool the bulb,
the suction pressure should fall and the suction
temperature will rise.
3. Next warm the bulb in your hand. As you warm the
bulb, the suction pressure should rise and the suction
temperature will fall.
4. If a temperature or pressure change is noticed, the
expansion valve is operating. If no change is noticed,
the valve is restricted, the power element is faulty, or
the equalizer tube is plugged.