Service; (Gph1524-36); (Gph1542-60); Hrough Indoor Coil - Goodman GPH1524M41 Installation Manual

SUPERHEAT = SUCTION LINE TEMP - SAT. SUCTION TEMP
SATURATED SUCTION PRESSURE
TEMPERATURE CHART
Suction
Pressure
PSIG
50
52
54
56
58
60
62
64
66
68
70
72
71
76
78
80
E V S
XPANSION ALVE YSTEM
SINGLE SPEED APPLICATION (GPH1524**-GPH1536**)
1. Purge gauge lines. Connect service gauge manifold to
access fittings. Run system at least 10 minutes to allow
pressure to stabilize.
2. Temporarily install thermometer on liquid (small) line near
liquid line access fitting with adequate contact and insulate
for best possible reading.
3. Check subcooling and superheat. Systems with TXV
application should have a subcooling of 10 + 2°F and
superheat of 15 to 18ºF.
a. If subcooling and superheat are low, adjust TXV to
15 - 18ºF then check subcooling.
b. If subcooling is low and superheat is high, add charge
to raise subcooling to10 ± 2ºF then check superheat.
c. If subcooling and superheat are high, adjust TXV valve
to 15 - 18ºF then check subcooling.
d. If subcooling is high and superheat is low, adjust TXV
valve to 15 to 18ºF superheat and remove charge to
lower the subcooling to 10 ± 2ºF.
The TXV should NOT be adjusted at light load conditions
55º to 60ºF, under such conditions only the subcooling
can be evaluated. This is because suction pressure is
dependent on indoor airflow, and wet bulb temperature.
NOTE: Do NOT adjust charge based on suction pressure
unless there is a gross undercharge.
Saturated Suction
Temperature °F
R-410A
1
3
4
6
7
8
10
11
13
14
15
16
17
19
20
21
SUBCOOLING = SAT. LIQUID TEMP. - LIQUID LINE TEMP.
SATURATED LIQUID PRESSURE
TEMPERATURE CHART
Liquid
Pressure
PSIG
200
210
220
225
235
245
255
265
275
285
295
305
325
355
375
405
TWO SPEED APPLICATION (GPH1542**-GPH1560**)
Run the unit on low stage cooling for 10 minutes until refrigerant
pressures stabilize. Follow the guidelines and methods below to
check unit operation and ensure that the refrigerant charge is within
limits. Charge the unit on low stage.
1. Purge gauge lines. Connect service gauge manifold to
access fittings. Run system at least 10 minutes to allow
pressure to stabilize.
2. Temporarily install thermometer on liquid (small) line near
liquid line access fitting with adequate contact and insulate
for best possible reading.
3. Check subcooling and superheat. Two stage systems
running on low stage with TXV application should have a
subcooling of 5 to 7 ºF and superheat of 15 to 18ºF.
a. If subcooling and superheat are low, adjust TXV to 15
to 18ºF superheat, then check subcooling.
NOTE: To adjust superheat, turn the valve stem clock-
wise to increase and counter clockwise to decrease.
b. If subcooling is low and superheat is high, add charge
to raise subcooling to 5 to 7 ºF then check superheat.
c. If subcooling and superheat are high, adjust TXV valve
to 15 to 18ºF superheat, then check subcooling.
d. If subcooling is high and superheat is low, adjust TXV
valve to 15 to 18ºF superheat and remove charge to
lower the subcooling to 5 to 7 ºF.
NOTE: Do NOT adjust the charge based on suction
pressure unless there is a gross undercharge.
4. Disconnect manifold set, installation is complete.
SUBCOOLING = SAT. LIQUID TEMP. - LIQUID LINE TEMP.
11
Saturated Liquid
Temperature °F
R-410A
70
73
76
78
80
83
85
88
90
92
95
97
101
108
112
118