Carrier 50HCQA Installation Manual Page 53
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53
Table 19 – Pressure (psig) vs. Voltage Drop Values for Suction Pressure Transducers
PRESSURE
(psig)
VOLTAGE
DROP (V)
PRESSURE
(psig)
VOLTAGE
DROP (V)
PRESSURE
(psig)
VOLTAGE
DROP (V)
PRESSURE
(psig)
VOLTAGE
DROP (V)
0
0.465
68
1.135
136
1.804
204
2.474
2
0.485
70
1.154
138
1.824
206
2.493
4
0.505
72
1.174
140
1.844
208
2.513
6
0.524
74
1.194
142
1.863
210
2.533
8
0.544
76
1.214
144
1.883
212
2.553
10
0.564
78
1.233
146
1.903
214
2.572
12
0.583
80
1.253
148
1.922
216
2.592
14
0.603
82
1.273
150
1.942
218
2.612
16
0.623
84
1.292
152
1.962
220
2.631
18
0.642
86
1.312
154
1.982
222
2.651
20
0.662
88
1.332
156
2.001
224
2.671
22
0.682
90
1.351
158
2.021
226
2.690
24
0.702
92
1.371
160
2.041
228
2.710
26
0.721
94
1.391
162
2.060
230
2.730
28
0.741
96
1.410
164
2.080
232
2.749
30
0.761
98
1.430
166
2.100
234
2.769
32
0.780
100
1.450
168
2.119
236
2.789
34
0.800
102
1.470
170
2.139
238
2.809
36
0.820
104
1.489
172
2.159
240
2.828
38
0.839
106
1.509
174
2.178
242
2.848
40
0.859
108
1.529
176
2.198
244
2.868
42
0.879
110
1.548
178
2.218
246
2.887
44
0.898
112
1.568
180
2.237
248
2.907
46
0.918
114
1.588
182
2.257
250
2.927
48
0.938
116
1.607
184
2.277
252
2.946
50
0.958
118
1.627
186
2.297
254
2.966
52
0.977
120
1.647
188
2.316
256
2.986
54
0.997
122
1.666
190
2.336
258
3.005
56
1.017
124
1.686
192
2.356
260
3.025
58
1.036
126
1.706
194
2.375
262
3.045
60
1.056
128
1.726
196
2.395
264
3.065
62
1.076
130
1.745
198
2.415
266
3.084
64
1.095
132
1.765
200
2.434
268
3.104
66
1.115
134
1.785
202
2.454
270
3.124
MAJOR SYSTEM COMPONENTS
General
The 48/50HC single package rooftop units contain the
ComfortLink electronic control system that monitors all operations
of the rooftop. The control system is composed of several main
control components and available factory-installed options or
field-installed accessories as listed in sections below. See Figs. 22
through 29 for typical control and power schematics for 48HC and
50HC. Refer to the Base unit installation instructions or actual unit
control box for specific unit wiring diagrams.
ComfortLINK v2.X
- 48/50HC 04---28 1
- Single Package Rooftop Units 1
- SAFETY CONSIDERATIONS 2
- BASIC CONTROL USAGE 3
- Accessory Navigator Display 4
- Operation 4
- CCN Tables and Display 4
- Force Hierarchy 5
- Generic Status Display Table 5
- START-UP 6
- Condenser Fans and Motors 7
- Return--Air Filters 7
- Outdoor--Air Inlet Screens 7
- Accessory Installation 7
- Orifice Change (48HC) 7
- Gas Heat (48HC) 8
- Economizer 9
- SERVICE TEST 12
- THIRD PARTY CONTROL 13
- CONTROLS OPERATION 14
- General Operation 15
- Occupancy Determination 16
- Cooling Mode Control 18
- Staging Control 18
- Compressor Control 19
- Outdoor Fan Control 19
- Heating Mode Control 19
- Heat Relay Control 20
- Economizer Position % 21
- Fan Speed % 21
- Free Cooling 22
- Thermostat Control 22
- Space Sensor Control 22
- Unoccupied Free Cooling 22
- Power Exhaust (CV units) 22
- Power Exhaust (SAVt units) 23
- IAQ (Analog Input) 23
- IAQ (Switch Input) 24
- Fan Enable (Switch Input) 24
- Dehumidification Demand 25
- Reheat Modes 25
- Temperature Compensated Start 29
- Carrier Comfort Network (CCN) 30
- Configuration 30
- Demand Limit 30
- TROUBLESHOOTING 31
- Complete Unit Stoppage 32
- Restart Procedure 32
- Alarms and Alerts 32
- MBB --- Main Base Board 37
- Green LED 39
- Yellow LED 39
- Cooling Troubleshooting 40
- Economizer Troubleshooting 42
- Heating Troubleshooting 43
- IDM – Induced-Draft Motor 44
- “AUTO” position 44
- Phase Loss Protection 46
- Thermistor Troubleshooting 46
- CIRCUIT “B” 49
- CIRCUIT “A” 49
- Transducer Troubleshooting 50
- Forcing Inputs and Outputs 50
- MAJOR SYSTEM COMPONENTS 53
- RED LED - STATUS GREEN LED 62
- LEN (LOCAL EQUIPMENT NETWORK) 62
- YELLOW LED 62
- CCN (CARRIER COMFORT NETWORK) 62
- INSTANCE JUMPER (SET TO 1) 62
- RED LED-STATUS 66
- 48/50HC 04--14 Units — 67
- 48/50HC 17--28 Units — 68
- Central Terminal Board (CTB) 68
- Scrolling Marquee Display 70
- Accessory Navigatort Display 70
- Interface 70
- Protective Devices 72
- Field-Installed Accessories 72
- MODE — RUN STATUS 75
- MODE — RUN STATUS (cont) 76
- MODE — SERVICE TEST 78
- MODE — TEMPERATURES 78
- MODE — PRESSURES 78
- MODE — INPUTS 79
- MODE — OUTPUTS 79
- MODE — SET POINTS 79
- MODE — CONFIGURATION 80
- MODE — TIME CLOCK 85
- CCN ONLY TABLES 85
- MODE — OPERATING MODES 86
- MODE — OPERATING MODES (cont) 87
- MODE — ALARMS 89
- VFD Diagnostics 95
- Table 32 — FAULT CODES (cont) 96
- Table 33 – ALARM CODES 97
- INDICATE UNIT SETTINGS BELOW 98
- MODE — CONFIGURATION (cont) 100
- ComfortLINK v2.X 100
- ELECTRICAL 103
- TEMPERATURES 103
- PRESSURES 103
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