Carrier 50HCQA Installation Manual Page 44
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- Table of contents
- TROUBLESHOOTING
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44
1 FLASH - INDOOR FAN DELAY
MODIFIED (HEATING)
2 FLASHES - OPENING OF LIMIT
SWITCH
3 FLASHES - FLAME SENSOR
INDICATES FLAME WITH
CLOSED GAS VALVE
4 FLASHES - LIMIT SWITCH
CYCLED 4 TIMES ON SINGLE
CALL FOR HEAT
5 FLASHES - IGNITION LOCKOUT
(No ignition within 15 minutes)
6 FLASHES - INDUCED DRAFT
MOTOR FAULT
(No signal from the Hall Effect
Sensor or 60 seconds)
7 FLASHES - OPENING OF
ROLLOUT SWITCH
8 FLASHES - HARDWARE OR
SOFTWARE FAULT
9 FLASHES - SOFTWARE
LOCKOUT
FLASHING
LED is
ON
CALL FOR
24 VOLTS
BETWEEN
F1 AND C
YES
No
DEFECTIVE
IGC BOARD
1. BLOWN 5 AMP FUSE
2. DEFECTIVE 24V TRANS.
3. BROKEN WIRE
4. NO POWER TO UNIT
HEATING
‘W1’ FROM BASE CONTROL BOARD ENERGIZES ‘W’
ON IGC - 1 MINUTE LOCK-ON
COMBUSTION RELAY ON IGC IN ENERGIZED
COMBUSTION RELAY ENERGIZES INDUCED DRAFT MOTOR (IDM) THROUGH
TERMINAL ′CM′ ON IGC
IF IDM IS TURNING AT CORRECT SPEED (AT LEAST 2400 RPM), HALL
EFFECT SENSOR SENDS CORRECT SIGNAL TO TERMINAL ‘J1’ ON IGC
IF LIMIT SWITCH AND ROLLOUT
SWITCH ARE CLOSED, IGC SAFETY
LOGIC WILL INITIATE IGNITION
SEQUENCE
IGC HIGH VOLTAGE
TRANSFORMER CREATES A
10,000 VOLT SPARK FOR 5
SECONDS
IGC SAFETY LOGIC OPENS GAS
VALVE FOR 5 SECONDS
DOES IGC DETECT
.2 MICROAMPS FOR 2
SECONDS
No
Yes
AFTER 45 SECONDS (OR LESS IF THE TIMING
HAS BEEN REDUCED DUE TO LIMIT SWITCH
TRIPS) IGC WILL ENERGIZE BLOWER RELAY
DID LIMIT
SWITCH OPEN BEFORE THE 45
SECONDS (OR THE MODIFIED
TIME) HAS TIMED OUT?
Yes
No
No
IGC SAFETY LOGIC WILL SHUT
OFF GAS VALVE AND SPARK
20 SECOND PURGE OF HEAT
EXCHANGER
IS THIS THE
33RD RETRY? (OR 15
MINUTES)
Yes
IGNITION LOCKOUT
(5 FLASHES OF LED)
SUBTRACT 5 SECONDS (OR
ANOTHER 5 SECONDS) FROM
INDOOR FAN ON TIME DELAY
NORMAL HEATING OPERATION
HEATING DEMAND SATISFIED
45 SECOND BLOWER SHUTOFF DELAY
(DELAY EXTENDED BY 5 SECONDS FOR EACH LIMIT SWITCH TRIP
MAXIMUM DELAY: 3 MINUTES)
IDM STOPS, SAFETY LOGIC SHUTS OFF GAS VALVE
LEGEND
IDM – Induced-Draft Motor
IGC – Integrated Gas Unit Controller
NOTE: Thermostat Fan Switch in the
“AUTO” position.
OFF
C07014
Fig. 15 -- IGC Service Analysis Logic
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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