Page 30
4- Read liquid line pressure from gauge and convert to
condensing temperature using standard HCFC22
temperature/pressure conversion chart (or conver
sion scale on gauge).
5- The difference between the liquid line temperature
(from step 3) and the conversion temperature (from
step 4) is subcooling (subcooling = conversion tem
perature minus liquid temperature). Subcooling tem
perature should approximate the values given in table
12. Add refrigerant to increase subcooling and re
move refrigerant to reduce subcooling.
MODEL NO.
Subcooling
F at Various Ambient Temps.
75
F
85
F
95
F
105
F 115
F
GCS16R-411
65
F
GCS16H-311
GCS16H-261
14
14
14
14
12
8
12
18
18
16
14
12
8
9
15
16
17
17
TABLE 12
GCS16-411
18
18
16
14
12
8
GCS16-511/513
GCS16-651/653
GCS16R-511 and GCS16R-651 ONLY
(Approach Method)
6- Check ambient (outdoor) temperature.
7- If ambient temperature is above 60
F (15
C), place
thermometer in well and read temperature.
8- Approach temperature is the difference between am
bient and liquid line temperatures (Approach = liquid
minus ambient.) Approach temperature should be
4
F (2
C) for GCS16-511/513 and GCS16R-511
units. Approach temperature should be 9
F (5
C) for
GCS16-651/653 and GCS16R-651 units. Refrigerant
must be added to lower approach temperature. Re
move refrigerant from system to increase approach
temperature.
NOTE - Use table 13 as a general guide for performing
maintenance checks. When unit is properly charged
(whether by approach or subcooling method) line pres
sures should approximate those given in table 13.
Table 13 is not a procedure for charging the system.
Minor variations in these pressures may be expected
due to differences in installations. Significant devi
ations could mean that the system is not properly
charged or that a problem exists with some component
in the system. Used prudently, table 13 could serve as
a useful service guide.
NORMAL OPERATING PRESSURES
LIQ.
+ 10
SUC.
+ 5
85
F
95
F
105
F
PSIG
PSIG
LIQ.
+ 10
SUC.
+ 5
PSIG
PSIG
115
F
65
F
LIQ.
+ 10
SUC.
+ 5
PSIG
PSIG
LIQ.
+ 10
SUC.
+ 5
PSIG
PSIG
LIQ.
+ 10
SUC.
+ 5
PSIG
PSIG
LIQ.
+ 10
SUC.
+ 5
PSIG
PSIG
75
F
GCS16H-261
GCS16H-311
GCS16-411/413
GCS16R-411
GCS16-511/513
GCS16R-511
GCS16-651/653
GCS16R-651
149
154
146
158
146
55
58
57
64
55
182
188
182
190
178
66
69
66
66
68
216
223
214
222
210
73
76
73
74
73
246
256
252
255
244
76
79
78
77
78
282
292
287
290
289
78
82
83
83
84
318
326
328
330
335
80
84
87
87
89
MODEL NO.
TABLE 13
