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CHARGE USING THE APPROACH
METHOD -
OUTDOOR TEMPERATURE
> 65_F (18<_C)
The following procedure is intended as a general guide and
is for use on expansion valve systems only. For best
results, indoor temperature should be 70°F (21°C) to 80°F
(26°C). Monitor system pressures while charging.
1. Record outdoor ambient temperature
using a digital
thermometer,
2. Attach high pressure gauge set and operate unit for
several minutes to allow system pressures to stabilize,
3. Compare stabilized pressures with those provided in
table
7,
"Normal
Operating
Pressures,"
Minor
variations in these pressures may be expected due to
differences
in installations,
Significant
differences
could mean that the system is not properly charged or
that a problem exists with some component
in the
system. Pressures higher than those listed indicate
that the system is overcharged, Pressures lower than
those listed indicate that the system is undercharged.
Verify adjusted charge using the approach method,
4. Use the same digital thermometer
used to check
outdoor ambient
temperature
to check liquid line
temperature, Verify the unit charge using the approach
method,
5. The difference
between
the ambient
and
liquid
temperatures
should
match the approach
values
Model
oF
(°C)*
given
in table 6. If the values
do not agree
with the
those in table 6, add refrigerant
to lower the approach
temperature
or recover
refrigerant
from the system
to
increase
the approach
temperature.
Table 6. HP13 Approach
Values
o
Liquid Line Temperature °F (°C)
o
Outdoor Temperature °F (°C)
o
Approach Temperature °F (°C)
-018
-024
-030
-036
-042
-048
-060
7
8
9
13
7
9
6
(3.9)
(4.4)
(5)
(7.2)
(3.9)
(5)
(3.3)
NOTE - For best results, use the same electronic thermometer to
check both outdoor-ambient
and liquid-line temperatures.
*F: +/-1.0°;
C: +/-0.5 °
A IMPORTANT
Table 7. HP13 Normal Operating Pressures
- Liquid
+10 & Vapor +5 PSIG*
HP13-018
HP13-024
HP13-030
HP13-036
HP13-042
HP13-048
HP13-060
°F (°C)**
Liquid /Vapor
Liquid /Vapor
Liquid / Vapor
Liquid / Vapor
Liquid / Vapor
Liquid / Vapor
Liquid / Vapor
Cooling
65 (18)
141 / 81
148 / 80
146 / 78
154 / 78
139 / 67
146 / 75
139 / 74
75 (24)
1631 82
1761 82
171 I 79
180 180
163 174
171 I 77
164 177
85 (29)
191 184
206 / 83
201 / 80
216 / 81
191 181
198 178
193 178
95 (35)
222 / 85
240 / 84
233 / 81
246 / 81
220 / 84
229 / 79
230 / 79
105(41)
256 / 87
277 / 86
271 /81
284 / 82
256 / 85
268 / 81
262 / 82
115(45)
296/89
322/87
313/83
328 / 85
294 / 87
308 / 81
300 / 84
Heating
50(10)
192 / 64
185 / 60
198 / 58
196 / 58
204 / 59
197 / 39
213 / 58
40 (4)
180 / 53
176 / 50
188 / 47
185 / 47
195 / 49
189 / 31
200 / 46
30 (-1)
172 / 43
165 / 49
175 / 35
176 / 37
184 / 39
181 / 25
189 / 37
20 (-7)
164 / 34
162 / 31
163 / 26
170 / 30
178 / 32
175 / 18
177 / 32
*These are most-popular-match-up
pressures. Indoor match up, indoor air quality, and indoor load cause pressures to vary
**Temperature of the air entering the outside coil.
505076M
0_07
Page 14
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