GSZC18 Installation
7
V
IOLATION
OF
EPA
REGULATIONS
MAY
RESULT
IN
FINES
OR
OTHER
PENALTIES
.
NOTICE
CAUTION
Damage to the unit caused by operating the
compressor with the suction valve closed is not
covered under the warranty and may cause serious
compressor damage.
F
INAL
C
HARGE
A
DJUSTMENT
The outdoor temperature must be 60°F or higher. Set the room
thermostat to COOL, fan switch to AUTO, and set the tempera-
ture control well below room temperature.
After system has stabilized per startup instructions, check sub-
cooling and superheat as detailed in the following section.
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
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
ECOVER
ALL
REFRIGERANT
DURING
SYSTEM
REPAIR
AND
BEFORE
FINAL
UNIT
DISPOSAL
.
CAUTION
NOTE: Units matched with indoor coils equipped with non-ad-
justable TXV should be charged by subcooling only.
Run the unit on low stage cooling for 10 minutes until refriger-
ant pressures stabilize. Use the following guidelines and meth-
ods 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 base-
valve service ports. Run system at least 10 minutes to allow
pressure to stabilize.
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 subcooling and vapor
temperature to determine superheat.
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