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359513-UIM-A-0408
10
Johnson Controls Unitary Products
SECTION VIII: SYSTEM OPERATION
ANTI-SHORT CYCLE DELAY
The control includes a five-minute anti-short cycle delay (ASCD) timer
to prevent the compressor from short cycling after a power or thermo-
stat signal interruption. The ASCD timer is applied when the control is
first powered from the indoor unit thermostat and immediately following
the completion of a compressor run cycle. The compressor and the out-
door fan will not operate during the five minutes that the timer is active.
The ASCD timer can be bypassed by connecting the TEST terminals
for three seconds while the thermostat is calling for compressor opera-
tion (Y input signal energized).
TABLE 1:
R-22 Saturated Properties
Pressure
PSIG
Temp °F
Pressure
PSIG
Temp °F
Pressure
PSIG
Temp °F
Pressure
PSIG
Temp °F
Pressure
PSIG
Temp °F
Pressure
PSIG
Temp °F
80
48
110
64
140
78
170
91
200
101
230
111
82
49
112
65
142
79
172
91
202
102
232
112
84
50
114
66
144
80
174
92
204
103
234
112
86
51
116
67
146
81
176
93
206
103
236
113
88
52
118
68
148
82
178
94
208
104
238
114
90
54
120
69
150
83
180
94
210
105
240
114
92
55
122
70
152
84
182
95
212
105
242
115
94
56
124
71
154
84
184
96
214
106
244
115
96
57
126
72
156
85
186
97
216
107
246
116
98
58
128
73
158
86
188
97
218
107
248
117
100
59
130
74
160
87
190
98
220
108
250
117
102
60
132
75
162
88
192
99
222
109
252
118
104
61
134
76
164
88
194
99
224
109
254
118
106
62
136
77
166
89
196
100
226
110
256
119
108
63
138
78
168
90
198
101
228
111
258
119
FIGURE 10:
Heat Pump Flow Diagram
CHARGE COMPENSATOR
(Empty in cooling / full in heating)
(Not included in all Units)
FIELD CONNECTED LINE
INDOOR COIL
OUTDOOR
COIL
4-WAY
REVERSING
VALVE
FILTER DRYER
(Solid core)
SUCTION
ACCUMULATOR
LIQUID
SENSOR
COMPRESSOR
FIELD CONNECTED LINE
SHOWN IN COOLING POSITION.
COOLING CYCLE FLOW
HEATING CYCLE FLOW
BI-FLOW
TXV/CHECK
VALVE (Cooling) **
** NOTE: The indoor coil is shipped with an orifice. The orifice must be replaced with a TXV Kit.
BI-FLOW
TXV/CHECK
VALVE OR ORIFICE (Heating)
FIGURE 11:
Demand Defrost Control Module
TEST
AMBIENT
AMBG
COIL
G
COIL
1
2
3
4
COND
FA
N
HIGH
VOL
T
AGE
PRESSURE
M
SWITCH
REV
VALVE
X/L
R
C
Y
O
W
W1/66
X/L
R
C
Y
O
W
W1/66
DEMAND
DEFROST CURVE
SELECTION JUMPER
P