Installation Manual

7
1. Purge gauge lines. Connect service gauge manifold to base-
valve service ports.
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 6°F +/- 1°F and
superheat of 8°F +/- 1°F.
a. If subcooling and superheat are low, adjust TXV to
8°F +/- 1°F 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 6°F +/- 1°F then check superheat.
c. If subcooling and superheat are high, adjust TXV valve
to 8°F +/- 1°F superheat, then check subcooling.
d. If subcooling is high and superheat is low, adjust TXV
valve to 8°F +/- 1°F superheat and remove charge to
lower the subcooling to 6°F +/- 1°F.
NOTE: Do NOT adjust the charge based on suction
pressure unless there is a gross undercharge.
4. Disconnect manifold set, installation is complete.
NOTE: Check the Schrader ports for leaks and tighten valve cores
if necessary. Install caps finger-tight.
SUPERHEAT FORMULA =
SUCT. LINE TEMP. - SAT. SUCT. TEMP.
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
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