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°F
Psig
°F
Psig
32
100.8
48
137.1
33
102.9
49
139.6
34
105.0
50
142.2
35
107.1
51
144.8
36
109.2
52
147.4
37
111.4
53
150.1
38
113.6
54
152.8
39
115.8
55
155.5
40
118.0
56
158.2
41
120.3
57
161.0
42
122.6
58
163.9
43
125.0
59
166.7
44
127.3
60
169.6
45
129.7
61
172.6
46
132.2
62
175.4
47
134.6
Table 4. Normal Operating Pressures (Liquid +10 and Suction +5 psig)
IMPORTANT
Model
SSB036H4S4
5F (5C)*
Liquid
65 (18)
217
75 (24)
251
85 (29)
292
95 (35)
337
105 (41)
387
115 (46)
440
65 (18)
230
75 (24)
265
85 (29)
307
95 (35)
354
105 (41)
405
115 (46)
460
*Temperature of air entering outdoor coil.
**(Liquid +10 psig; Vapor +5 psig) Typical pressures; indoor unit match up, indoor air quality equipment, and indoor load will cause the pressures to vary.
System Operation
SECOND-STAGE OPERATION
If the demand defrost control (A108) receives a call for
second-stage compressor operation Y2 in heating or
cooling mode and the first‐stage compressor output is
active, the second‐stage compressor solenoid output will
be energized.
If first‐stage compressor output is active in heating mode
and the outdoor ambient temperature is below the selected
compressor lock-in temperature, the second‐stage
compressor solenoid output will be energized without the
Y2 input. If the jumper is not connected to one of the
temperature selection pins on P3 (40, 45, 50, 55°F), the
default lock-in temperature of 40°F (4.5°C) will be used.
Table 3. HFC-410A Temperature (°F) - Pressure (Psig)
°F
Psig
°F
Psig
63
178.5
79
231.6
64
181.6
80
235.3
65
184.3
81
239.0
66
187.7
82
242.7
67
190.9
83
246.5
68
194.1
84
250.3
69
197.3
85
254.1
70
200.6
86
258.0
71
203.9
87
262.0
72
207.2
88
266.0
73
210.6
89
270.0
74
214.0
90
274.1
75
217.4
91
278.2
76
220.9
92
282.3
77
224.4
93
286.5
78
228.0
Use this table to perform maintenance checks; it is not a procedure for charging the system. Minor variations
in these pressures may be due to differences in installations. Significant deviations could mean that the
system is not properly charged or that a problem exists with some component in the system.
Suction
Liquid
First Stage (Low Capacity)
141
229
143
263
146
304
147
350
150
400
154
453
Second Stage (High Capacity)
137
234
140
269
141
312
144
359
146
409
149
465
Page 25
°F
Psig
°F
94
290.8
110
95
295.1
111
96
299.4
112
97
303.8
113
98
308.2
114
99
312.7
115
100
317.2
116
101
321.8
117
102
326.4
118
103
331.0
119
104
335.7
120
105
340.5
121
106
345.3
122
107
350.1
123
108
355.0
124
109
360.0
SSB048H4S4
Suction
140
143
146
148
150
155
135
137
140
141
143
146
IMPORTANT
Some scroll compressor have internal vacuum protector
that will unload scrolls when suction pressure goes
below 20 psig. A hissing sound will be heard when the
compressor is running unloaded. Protector will reset
when low pressure in system is raised above 40 psig. DO
NOT REPLACE COMPRESSOR.
Psig
°F
Psig
°F
365.0
125
445.9
141
370.0
126
451.8
142
375.1
127
457.6
143
380.2
128
463.5
144
385.4
129
469.5
145
390.7
130
475.6
146
396.0
131
481.6
147
401.3
132
487.8
148
406.7
133
494.0
149
412.2
134
500.2
150
417.7
135
506.5
151
423.2
136
512.9
152
428.8
137
519.3
153
434.5
138
525.8
154
440.2
139
532.4
155
140
539.0
SSB060H4S4
Liquid
Suction
229
134
264
138
305
140
349
142
402
147
455
149
244
129
282
131
324
133
371
136
422
139
474
143
Psig
545.6
552.3
559.1
565.9
572.8
579.8
586.8
593.8
601.0
608.1
615.4
622.7
630.1
637.5
645.0
SSB*H4 SERIES
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