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Unit must be grounded with separate ground conductor.
The unit wiring diagram is located inside the unit access
panel. Low voltage control wiring are pigtail leads located
below the main control box and are color coded to match
the connection called out on the wiring schematic.
If any of the original unit wiring is replaced, the same size
and type wire must be used. Electrical wiring must be
sized to carry minimum circuit ampacity marked on the
unit. Each unit must be wired with a separate branch cir
cuit and be properly fused.
System Performance
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 82
_
F outdoor − 80
_
F indoor dry bulb/67
_
F
wet bulb. If superheat measured deviates from values in
table below, refrigerant charge should be adjusted ac
cordingly for maximum performance.
Verify system performance using table 3 or table 4 as a
general guide. These tables should not be used for charg
ing 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 use
ful service guide. Table 3 should be used when unit is
charged during the heating mode. If outdoor ambient is
below 45
°
F, run unit through defrost cycle first, wait 15
minutes for system pressures to stabilize, then take pres
sures. Data in table 3 is based on 70
°
F dry bulb return air.
Data in table 4 is based on 80
°
F dry bulb / 67
°
F wet bulb
return air. Allow unit operation to stabilize before taking
pressure readings.
TABLE 2
SUCTION SUPERHEAT TABLE
UNIT MODEL NO.
SUCTION SUPERHEAT
82
_
F OD minus 80
_
F IDDB
/ 67
_
F IDWB
12CHP−030, −036
12CHP−024
12CHP−030
18 − 20
_
12CHP−036
18 20
12CHP−042, −048, −060
TABLE 3
NORMAL OPERATING PRESSURES −− HEATING MODE
70
°
F db RETURN AIR
AIR TEMPERATURE ENTERING OUTDOOR COIL (
°
F)
MODEL
PRESSURE
0°
5°
10°
15°
20°
25°
30°
35°
40°
45°
50°
55°
60°
12CHP−024
17
20
24
28
33
38
43
49
55
62
69
74
81
12CHP−030
14
17
21
25
29
34
39
45
51
56
63
70
78
12CHP−036
SUCTION
14
17
21
25
29
34
39
45
51
56
63
70
78
12CHP−042
SUCTION
16
19
23
27
31
36
41
45
51
55
62
68
76
12CHP−048
15
18
22
26
30
35
40
45
51
55
62
68
76
12CHP−060
14
17
21
25
29
34
39
44
50
54
61
67
75
12CHP−024
181
191
200
209
219
228
237
247
256
265
275
284
293
12CHP−030
168
173
179
184
189
195
200
205
211
216
221
227
232
12CHP−036
LIQUID
165
172
178
184
191
197
203
210
216
222
229
235
241
12CHP−042
LIQUID
167
174
181
187
194
201
207
214
221
227
234
241
247
12CHP−048
203
211
220
229
237
246
255
263
272
281
289
298
307
12CHP−060
163
170
177
183
190
197
203
210
217
223
230
237
243
