Carrier 50HCQA Installation Manual Page 63
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63
Table 20 – Main Base Board (MBB) Connections
DISPLAY
NAME
POINT DESCRIPTION SENSOR LOCATION TYPE OF I/O
CONNECTION
PIN NUMBER
INPUTS
Input power from TRAN2 control box 24 VAC J 1 , 1 --- 3
IGC.F IGC Fan Request gas section switch input J6, 4
FDWN Fire shutdown switch supply/return/space switch input J6, 6
G Thermostat G (Fan) space switch input J7, 2
W2 Thermostat W2 (2nd Stage Heat) space switch input J7, 4
W1 Thermostat W1 (1st Stage Heat) space switch input J7, 6
Y2 Thermostat Y2 (2nd Stage Cool) space switch input J7, 8
Y1 Thermostat Y1 (1st Stage Cool) space switch input J7, 10
FIL.S Filter status switch indoor fan section switch input J 9 , 2 --- 3
HUM Humidistat switch input space switch input J 9 , 5 --- 6
Not Used 0--- 5vdc digital input J 9 , 7 --- 9
Not Used 0--- 5vdc digital input J 9 , 1 0 --- 1 2
SPT Space temperature (T55/56) space 10k thermistor J 8 , 1 --- 2
SPTO Space temperature offset (T56) space 10k thermistor J 8 , 2 --- 3
OAT Outdoor air temperature outdoor coil support 10k thermistor J 8 , 5 --- 6
SAT Supply air temperature
indoor fan housing, or
supply duct
10k thermistor J 8 , 7 --- 8
SCT.A Saturated condenser temperature, circuit A outdoor coil, circuit A 5k thermistor J 8 , 9 --- 1 0
SCT.B Saturated condenser temperature, circuit B outdoor coil, circuit B 5k thermistor J 8 , 1 1 --- 1 2
RAT Return Air Temperature Return 10k thermistor J 8 , 1 3 --- 1 4
FAN.S Fan status switch indoor fan section switch input J 8 , 1 5 --- 1 6
SSP.A Suction pressure, circuit A compressor A suction pipe
0 --- 5 V D C p r e s s u r e
transducer
J 8 , 1 8 --- 2 0
SSP.B Suction pressure, circuit B compressor B suction pipe
0 --- 5 V D C p r e s s u r e
transducer
J 8 , 2 1 --- 2 3
Not Used 0 --- 5 V D C J 8 , 2 4 --- 2 6
OUTPUTS
CRC Cooling Reheat Control relay J10, 3
RH2.A Reheat 2 Valve Circuit A relay J10, 6
RH2.B Reheat 2 Valve circuit B relay J10, 9
IDF.1 Indoor fan relay 1 relay J10, 11
IDF.2 Indoor Fan relay 2 relay J10, 13
IDF.3 Indoor Fan relay 3 relay J10, 16
ALRM Alarm relay relay J10, 19
COMP.B Compressor B1 relay relay J10, 21
COMP.A Compressor A1 relay relay J10, 23
HT.1 Heat Stage 2 relay relay J10, 25
HT.2 Heat Stage 1 relay relay J10, 27
COMMUNICATION
Local Equipment Network (LEN) communication J 5 , 1 --- 3
Carrier Comfort Network (CCN) communication J 5 , 5 --- 7
Network device power 24 VAC J 5 , 9 --- 1 0
Scrolling Marquee Display (LEN) communication J 4 , 1 --- 3
Scrolling Marquee Display power 24 VAC J 4 , 5 --- 6
Expansion LEN Bus communication J 3 , 1 --- 3
Optional ECB power 24 VAC J 2 , 1 --- 2
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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