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SECTION VIII: SYSTEM START-UP
ENERGIZE CRANKCASE HEATER
If this unit is equipped with a crankcase heater for the compressor, a
warning label with an adhesive back is supplied in the unit installation
instruction packet. This label should be attached to the field supplied
disconnect switch where it will be easily seen.
In order to energize the crankcase heater, set the indoor cooling ther-
mostat to the OFF position. Close the line power disconnect to the unit.
An attempt to start the compressor without at least 8 hours of
crankcase heat will damage the compressor.
TABLE 1: R-410A Saturation Properties
Pressure
Temp °F
PSIG
45
130
46
132
47
135
48
137
49
140
50
142
51
145
52
147
53
150
54
153
55
156
56
158
57
161
58
164
59
167
CHARGE COMPENSATOR
(Empty in cooling / full in heating)
(Not included in all Units)
OUTDOOR
COIL
LIQUID
SENSOR
FIGURE 9: Heat Pump Flow Diagram
Johnson Controls Unitary Products
Pressure
Temp °F
Temp °F
PSIG
60
170
61
173
62
176
63
179
64
182
65
185
66
188
67
191
68
194
69
197
70
201
71
204
72
207
73
211
74
214
BI-FLOW
TXV/CHECK
VALVE OR ORIFICE (Heating)
WITH POWER TO UNIT AND THERMOSTAT IN COOLING POSI-
TION:
1.
In the cooling cycle, discharge gas is pumped to the outdoor coil
which is the condenser. The indoor coil is the evaporator.
2.
If fan switch is in ON position, a circuit is made through blower
relay to provide continuous blower operation.
3.
With fan switch in AUTO position, a circuit is made from thermo-
stat cooling contact through blower relay to provide blower opera-
tion.
4.
System will cycle with thermostat demand to provide cooling as
needed.
Pressure
Temp °F
PSIG
75
217
90
76
221
91
77
224
92
78
228
93
79
232
94
80
235
95
81
239
96
82
243
97
83
247
98
84
250
99
85
254
100
86
258
101
87
262
102
88
266
103
89
270
104
FIELD CONNECTED LINE
4-WAY
REVERSING
VALVE
FILTER DRYER
(Solid core)
COMPRESSOR
SUCTION
ACCUMULATOR
538605-UIM-B-1009
Pressure
Pressure
Temp °F
PSIG
274
105
278
106
282
107
287
108
291
109
295
110
299
111
304
112
308
113
313
114
317
115
322
116
326.
117
331
118
336
119
INDOOR COIL
BI-FLOW
TXV/CHECK
VALVE (Cooling) **
PSIG
341
345
350
355
360
365
370
375
380
385
391
396
401
407
412
9
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