GVZC20 Installation Manual

12

OD AMBIENT TEMP
(degF)
Subcooling Weigh in Weigh in
(degF) Charge Charge
< 65° F 65° F to 105° F > 105° F
8° F ± 1° F
NOTE: Subcooling information is only valid while the unit is
operating at 100% capacity or 100% of compressor speed in
CHARGE MODE. Compressor speed is displayed under
STATUS menu in the thermostat.
8. For TXV Indoor Unit
The system subcooling should be 8°F ± 1°F (*1). If
not in that range, adjust subcooling and superheat
according to the following procedure.
a. If subcooling and superheat are low, adjust TXV
to 8°F ± 1°F superheat, then check subcooling.



b. If subcooling is low and superheat is 8°F ± 1°F,
add charge to rise subcooling to 8°F ± 1°F (*1),
then check superheat.
c. If subcooling is low and superheat is high, add
charge to rise subcooling to 8°F ± 1°F (*1), then
check superheat.
d. If subcooling is 8°F ± 1°F (*1) and superheat is
high, adjust the TXV valve to 8°F ± 1°F superheat,
then check subcooling.
e. If subcooling and superheat are high, adjust the
TXV valve to 8°F ± 1°F superheat, then check
subcooling.
f. If subcooling is high and superheat is 8°F ± 1°F,
remove charge to lower the subcooling to 8°F ±
1°F (*1), then check superheat.
g. If subcooling is high and superheat is low, adjust
the TXV valve to 8°F ± 1°F superheat and remove
charge to low the subcooling to 8°F ± 1°F (*1).
h. If subcooling is 8°F ± 1°F (*1) and superheat is
low, adjust the TXV valve to 8°F ± 1°F superheat
and remove charge to lower the subcooling 8°F ±
1°F (*1), then check the superheat.



C HECK THE S CHRADER PORTS FOR LEAKS AND TIGHTEN VALVE CORES , IF
NECESSARY . I NSTALL CAPS FINGER - TIGHT .
NOTICE
D O NOT ADJUST THE CHARGE BASED ON SUCTION PRESSURE UNLESS
THERE IS A GROSS UNDERCHARGE .
NOTICE
SUCTION PRESSURE
PSIG
R-410A °F
LIQUID PRESSURE
PSIG
R-410A °F
50 1 200 70
52 3 210 73
54 4 220 76
56 6 225 78
58 7 235 80
60 8 245 83
62 10 255 85
64 11 265 88
66 13 275 90
68 14 285 92
70 15 295 95
72 16 305 97
74 17 325 101
76 19 355 108
78 20 375 112
80 21 405 118
85 24 415 119
90 26 425 121
95 29 435 123
100 31 445 125
110 36 475 130
120 41 500 134
130 45 525 138
140 49 550 142
150 53 575 145
160 56 600 149
170 60 625 152
SATURATED SUCTION PRESSURE
TEMPERATURE CHART
SATURATED LIQUID PRESSURE
TEMPERATURE CHART
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• 


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


•  

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