Specifications

9
E XPANSION V ALVE S YSTEM
T O  PREVENT  PERSONAL  INJURY , CAREFULLY  CONNECT  AND  DISCONNECT 
MANIFOLD  GAUGE  HOSES .E SCAPING  LIQUID  REFRIGERANT  CAN  CAUSE 
BURNS .D O  NOT  VENT  REFRIGERANT  INTO  THE  ATMOSPHERE .R ECOV ER 
ALL  REFRIGERANT  DURING  SYSTEM  REPAIR  AND  BEFORE  FINAL  UNIT 
DISPOSAL .
CAUTION
NOTE: AVPTC air handlers have a non-adjustable TXV. Charge
unit match with this air handler by subcooling only.
Run the remote on low stage cooling for 10 minutes until refrig-
erant pressures stabilize. Use the following guidelines and
methods to check unit operation and ensure that the refriger-
ant charge is within limits. Charge the unit on low stage.
1. Purge gauge lines. Connect service gauge manifold to
base-valve service ports. Run system at least 10 minutes
to allow pressure to stabilize.
SUCTION PRESSURE
PSIG R-22 R-410A
50 26 1
52 28 3
54 29 4
56 31 6
58 32 7
60 34 8
62 35 10
64 37 11
66 38 13
68 40 14
70 41 15
72 42 16
74 44 17
76 45 19
78 46 20
80 48 21
85 50 24
90 53 26
95 56 29
100 59 31
110 64 36
120 69 41
130 73 45
140 78 49
150 83 53
160 86 56
170 90 60
SATURATED SUCTION PRESSURE
TEMPERATURE CHART
SATURATED SUCTION
TEMPERATURE ºF
LIQUID PRESSURE
PSIG R-22 R-410A
200 101 70
210 105 73
220 108 76
225 110 78
235 113 80
245 116 83
255 119 85
265 121 88
275 124 90
285 127 92
295 130 95
305 133 97
325 137 101
355 144 108
375 148 112
405 155 118
415 157 119
425 n/a 121
435 n/a 123
445 n/a 125
475 n/a 130
500 n/a 134
525 n/a 138
550 n/a 142
575 n/a 145
600 n/a 149
625 n/a 152
SATURATED LIQUID PRESSURE
TEMPERATURE CHART
SATURATED LIQUID
TEMPERATURE ºF
2. 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.
3. Check subcooling and superheat. Systems with TXV
application should have a subcooling of 5 to 7°F and
superheat of 7 to 9 °F.
a. If subcooling and superheat are low, adjust TXV to 7
to 9 ºF 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 °F then check super-
heat.
c. If subcooling and superheat are high, adjust TXV
valve to 7 to 9 ºF superheat, then check subcooling.