Page 7
6<67(0 3(5)250$1&(
For maximum performance of this heat pump system,
the operating temperatures and pressures should be
checked and superheat determined at Standard ARI
test conditions of 82EF outdoor -- 80EF indoor dry
bulb/67EF wet bulb. If superheat measured deviates
from values in table 2, refrigerant charge should be ad-
justed accordingly for maximum performance.
Verify system performance using table 3 or table 4 as a
general guide. These tables should not be used for
charging the unit. Minor variations in these pressures
may be expected due to differences in installations.
Significant differences could mean that the system is
not properly charged or that a problem exists with
some component in the system. Used carefully, this
table could serve as a useful service guide. Table 3
should be used when unit is charged during the heat-
ing mode. If outdoor ambient is below 45qF, run unit
through defrost cycle first, wait 15 minutes for system
pressures to stabilize, then take pressures. Data in
table 3 is based on 70qF dry bulb return air. Data in table
4 is based on 80qF dry bulb / 87qF wet bulb return air.
Allow unit operation to stabilize before taking pressure
readings.
7$%/(
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UNIT MODEL NO.
SUCTION SUPERHEAT
82EF OD minus 80EF IDDB
/ 67EF IDWB
CHP29--024
18 -- 20E
CHP29--030
17 -- 19E
CHP29--036
17 -- 19E
CHP29--042
18 -- 20E
CHP29--048
12 -- 14E
CHP29--060
12 -- 14E
TABLE 3
NORMAL OPERATING PRESSURES ---- HEATING MODE
70qF db RETURN AIR
AIR TEMPERATURE ENTERING OUTDOOR COIL (qF)
MODEL
PRESSURE
0q
5q
10q
15q
20q
25q
30q
35q
40q
45q
50q
55q
60q
CHP29--024
19
23
27
31
35
38
42
45
49
53
57
51
65
CHP29--030
18
22
25
29
33
37
41
45
49
52
56
60
65
CHP29--036
SUCTION
19
23
25
30
34
38
41
45
48
51
55
59
63
CHP29--042
SUCTION
18
21
25
28
32
38
40
44
48
51
55
59
63
CHP29--048
17
18
22
25
27
29
31
31
41
49
53
57
62
CHP29--060
17
18
23
26
28
30
32
35
48
55
59
65
69
CHP29--024
138
145
153
160
170
180
190
200
206
216
225
235
244
CHP29--030
139
146
154
161
170
178
186
197
205
212
221
230
239
CHP29--036
LIQUID
140
147
155
162
170
178
186
194
200
205
214
222
230
CHP29--042
LIQUID
138
145
153
160
170
180
190
200
209
217
226
236
245
CHP29--048
139
140
150
157
162
171
182
197
215
235
249
255
265
CHP29--060
160
175
187
200
210
221
225
235
244
254
256
279
291