System Operation And Troubleshooting; Protection Function; Two-Stage Compressor (61K Ac Only); Temperature Sensor Resistance Table - ComfortStar 18 Installation Manual

15 SYSTEM OPERATION AND
TROUBLESHOOTING

15.1 Protection Function

Discharge temperature protection
Discharge temperature > 239°F, compressor stops
working.
Discharge temperature < 167°F, compressor restarts
working.
For 18K-30K
High pressure protection
High pressure > 609 PSIG, compressor and outdoor fan
motor stop working.
High pressure < 464 PSIG, compressor and outdoor fan
motor restart working (3 minutes delay necessary).
For 36-61K
High pressure protection
High pressure > 638 PSIG, compressor and outdoor fan
motor stop working.
High pressure < 464 PSIG, compressor and outdoor fan
motor restart working (3 minutes delay necessary).

15.3 Temperature Sensor Resistance Table

Temperature °F Resistance kΩ
-4 106.73
-3 103.25
-2 99.89
-1 96.65
0 93.53
1 90.53
2 87.62
3 84.83
4 82.13
5 79.52
6 77.01
7 74.58
8 72.24
9 69.98
10 67.8
11 65.69
12 63.65
13 61.68
14 59.78
15 57.95
56.17
16
17 54.46
18 52.8
19 51.2
20 49.65
21 48.16
46.71
22
23 45.31
24 43.95
25 42.64
26 41.38
27 40.15
38.97
28
29 37.82
30 36.71
31 35.64
32 34.6
33 33.59
34 32.61
35 31.67
36 30.76
Table 15-1
Temperature °F Resistance kΩ Temperature °F
37 29.87
38 29.22
39 28.19
40 27.39
41 26.61
42 25.85
43 25.12
44 24.42
45 23.73
46 23.07
47 22.42
48 21.8
49 21.2
50 20.61
51 20.04
52 19.49
53 18.96
54 18.44
55 17.94
56 17.45
57 16.98
58 16.52
59 16.08
60 15.65
61 15.23
62 14.83
63 14.43
64 14.05
65 13.68
66 13.32
67 12.97
12.64
68
69 12.31
70 11.99
71 11.68
72 11.38
73 11.09
10.8
74
75 10.53
76 10
77 10
18
For All System
T4 = Ambient Temperature
T4 < 32°F, compressor can't start
T4 ≥ 41°F, compressor restarts working
15.2 Two-stage Compressor
(61K AC only)
The 61K AC Systems feature a Two-stage scroll
compressor which is controlled by Y1 and Y2.
Y1: 24VAC thermostat input for first stage operation of
the unit.
Y2: 24VAC thermostat input/output for second stage
operation of the unit.
If the control 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 by the unit control system
operation function.
The unit control de−energizes the second-stage compressor
solenoid output immediately when the Y2 signal is removed
or the first-stage compressor output is de−energized for any
reason.
Resistance kΩ Temperature °F
78 10 119
9.5 120
79
80 9.26 121
81 9.03 122
82 8.81 123
83 8.59 124
125
84 8.38
8.17 126
85
86 7.97 127
87 7.78 128
88 7.59 129
89 7.4 130
131
90 7.22
91 7.05 132
92 6.88 133
93 6.72 134
94 6.56 135
95 6.4 136
137
96 6.25
97 6.1 138
98 5.96 139
99 5.82 140
100 5.68 141
101 5.55 142
143
102 5.42
103 5.3 144
104 5.18 145
105 5.06 146
106 4.94 147
107 4.83 148
149
108 4.72
109 4.61 150
110 4.51 151
111 4.41 152
112 4.31 153
113 4.21 154
155
114 4.12
115 4.03 156
116 3.94 157
117 3.85 158
118 3.77 159
Resistance kΩ
3.69
3.61
3.53
3.45
3.38
3.3
3.23
3.16
3.1
3.03
2.96
2.9
2.84
2.78
2.72
2.67
2.61
2.56
2.5
2.45
2.4
2.35
2.3
2.25
2.21
2.16
2.12
2.08
2.03
1.99
1.95
1.91
1.88
1.84
1.8
1.77
1.73
1.7
1.66
1.63
1.6