13
APH H
UMIDITY
C
ONTROL
When using a Humidistat (normally closed), cut jumper PJ6 on the control board. The Humidistat will only affect both low stage and high
stage cooling air flow by adjusting the Air flow to 85%.
APH T
WO
-S
TAGE
H
EATING
When using staged electric heat, cut jumper PJ4 on the control board.
APH T
HERMOSTAT
W
IRING
Use
thermostat wiring diagrams provided with the thermostat when making these connections.
See Appendix for Blower Performance tables.
SUPERHEAT CAN BE DETERMINED AS FOLLOWS:
1. Read suction pressure. Determine Saturated Suction Temperature from tables or pressure gauge saturated temperature
scale (R-410A).
2. Read suction line temperature.
3. Use the following formula:
E
XPANSION
V
ALVE
(TXV) S
YSTEM
Two Speed Application (APH16)
Run the unit on high 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 high 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 high stage with TXV application should have a subcooling and
superheat within the range listed on the chart.
a. If subcooling and superheat are low,
adjust
TXV superheat, then check subcooling.
NOTE:
To adjust superheat, turn the valve stem clockwise to increase and counter clockwise to decrease.
b. If subcooling is low and superheat is high,
add
charge to raise subcooling then check superheat.
c. If subcooling and superheat are high,
adjust
TXV valve superheat, then check subcooling.
SUCTION PRESSURE
SATURATED SUCTION
TEMPERATURE ºF
PSIG
R-410A
50
1
52
3
54
4
56
6
58
7
60
8
62
10
64
11
66
13
68
14
70
15
72
16
74
17
76
19
78
20
80
21
85
24
90
26
95
29
100
31
110
36
120
41
130
45
140
49
150
53
160
56
170
60
SATURATED SUCTION PRESSURE
TEMPERATURE CHART
SUPERHEAT = SUCTION LINE TEMP - SAT. SUCTION TEMP
LIQUID PRESSURE
SATURATED LIQUID
TEMPERATURE ºF
PSIG
R-410A
200
70
210
73
220
76
225
78
235
80
245
83
255
85
265
88
275
90
285
92
295
95
305
97
325
101
355
108
375
112
405
118
415
119
425
121
435
123
445
125
475
130
500
134
525
138
550
142
575
145
600
149
625
152
SATURATED LIQUID PRESSURE
TEMPERATURE CHART
SUBCOOLING = SAT. LIQUID TEMP. - LIQUID LINE TEMP.
Summary of Contents for APG1624060M41
Page 16: ...16 APPENDIX...
