Page 14
5 – Place thermometer in well and read liquid line
temperature. Liquid line temperature should be
a few degrees warmer than the outdoor air
temperature. Table 9 shows how many degrees
warmer the liquid line temperature should be.
Add refrigerant to make the liquid line
temperature cooler.
Recover refrigerant to make the liquid line
temperature warmer.
11
HP23–411/413
TABLE 9
Model
Liquid Line
°
F Warmer Than Outside
(Ambient) Temperature
HP23–261
HP23–311
HP23–411/413 (CAN)
HP23–461/463
APPROACH METHOD – EXPANSION VALVE SYSTEMS
AMBIENT TEMPERATURE OF 60
F (16
C) OR ABOVE
7
14
11
HP23–211
5
HP23–141
6
HP23–511/513
11
HP23–651/653
7
14
SUBCOOLING METHOD (TXV SYSTEMS)
(Ambient Temperature Below 60
F [16
C] )
NOTE- It may be necessary to restrict air flow in order
to reach liquid pressures in the 200-250 psig range
which are required for checking charge. Block equal
sections of air intake panels as shown in figure 24,
moving obstructions sideways until liquid pressures
in the 200-250 psig range are reached.
Block outdoor coil one side at a time
with cardboard or plastic sheets until
proper testing pressures are reached.
BLOCKING OUTDOOR COIL
FIGURE 24
CARDBOARD OR PLASTIC SHEET
1 – Connect gauge manifold. Connect an upright
R–22 drum to center port of gauge manifold.
2 – Operate indoor and outdoor units in cooling
mode. Allow outdoor unit to run until system
pressures stabilize.
3 – Make sure thermometer well is filled with
mineral oil before checking liquid line
temperature.
4 – Read liquid line pressure and convert to
condensing temperature using temperature/
pressure conversion chart.
Condensing temperature (read from gauges)
should be a few degrees warmer than the liquid
line temperature.
5 – Place thermometer in well and read liquid line
temperature. Table 10 shows how much
warmer the condensing temperature should be.
TABLE 10
Model
Condensing Temp
°
F Warmer Than Liquid Line
HP23–261
HP23–311
HP23–411/413 (CAN)
HP23–461/463
HP23–211
HP23–141
HP23–511/513
HP23–651/653
SUBCOOLING METHOD – EXPANSION VALVE SYSTEMS
AMBIENT TEMPERATURE BELOW 60
F (16
C)
4 + 2
9 + 2
13 + 2
9 + 2
8 + 2
6 + 2
7 + 2
HP23–411/413
9 + 2
13 + 2
Add refrigerant to make the liquid line
temperature cooler.
Recover refrigerant to make the liquid line
temperature warmer.
6 – When unit is properly charged liquid line
pressures should approximate those given in
table 11.
IMPORTANT
Use table 11 as a general guide for performing
maintenance checks. Table 11 is not a procedure for
charging the system. Minor variations in pressures
may be expected due to differences in installations.
Significant deviations may mean the system is not
properly charged or that a problem exists with some
component in the system. Used prudently, table 11
could serve as a useful service guide.
73
PSIG
285
84
HP23 NORMAL OPERATING PRESSURES (COOLING MODE)
OUTDOOR COIL
ENTERING AIR
TEMPERATURE
HP23–141
HP23–261
HP23–311
HP23–410
65
°
F (TXV)
75
°
F (TXV)
85
°
F (TXV)
95
°
F (TXV)
LIQ.
+ 10
SUC.
+ 10
PSIG PSIG
LIQ.
+ 10
SUC.
+ 10
PSIG PSIG
LIQ.
+ 10
SUC.
+ 10
PSIG PSIG
105
°
F (TXV)
LIQ.
+ 10
SUC.
+ 10
PSIG
PSIG
LIQ.
+ 10
SUC.
+ 10
PSIG PSIG
HP23–211
HP23–461/463 HP23–511/513 HP23–651/653
LIQ.
+ 10
SUC.
+ 10
PSIG
PSIG
LIQ.
+ 10
PSIG
SUC.
+ 10
SUC.
+ 10
PSIG
LIQ.
+ 10
PSIG
105
°
F (RFC III)
95
°
F (RFC III)
85
°
F (RFC III)
75
°
F (RFC III)
65
°
F (RFC III)
TABLE 11
137
155
182
210
240
130
175
155
210
240
78
79
80
82
83
59
75
67
82
87
145
165
195
225
255
150
195
170
230
260
72
73
74
77
79
61
75
68
81
85
160
185
215
245
275
150
205
175
240
280
74
76
78
80
84
60
73
67
78
81
170
195
225
255
290
165
220
190
255
75
77
78
80
82
62
74
69
80
175
200
227
260
295
170
230
205
265
305
75
76
77
79
81
61
73
68
79
82
160
185
215
245
280
155
210
180
240
275
72
74
76
78
80
61
68
63
73
76
165
185
210
240
275
155
210
185
245
275
72
73
76
78
80
63
69
64
74
78
150
175
200
235
265
75
76
78
80
*
*
*
*
*
*
*
*
*
*
*
For an approved match-up the HP23-651/653 must be used with a TXV.
HP23–410 (CAN)
LIQ.
+ 10
SUC.
+ 10
PSIG
PSIG
175
200
230
260
295
160
225
190
255
385
76
77
78
79
81
62
70
68
77
81
