Carrier 50HCQA Installation Manual Page 32
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- TROUBLESHOOTING
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32
components to be checked while the unit is not operating. See
Service Test.
Complete Unit Stoppage
There are several conditions that can cause the unit not to provide
heating or cooling:
S If an alarm is active which causes the unit to shut down,
diagnose the problem using the information provided in Alarms
and Alerts section below.
S Cooling and heating loads are satisfied.
S Programmed occupancy schedule.
S General power failure.
S Tripped 24-volt transformer circuit breakers.
S Blown fuse or circuit breakers
S Unit is turned off through the CCN network.
S If supply-air temperature is less than the Minimum SAT Lower
Level (SAT.L) configuration value, unit cannot cool.
S If outdoor-air temperature is less than the Compressor Lockout
Temperature (CA.LO, CB.LO) configuration value, unit cannot
cool.
S If outdoor-air temperature is greater than the Heating Lockout
Temperature (HT.LO) configuration value, unit cannot heat.
Restart Procedure
Before attempting to restart the machine, check the alarm list to
determine the cause of the shut down. If the shutdown alarm for a
particular control function has occurred, determine and correct the
cause before allowing the unit to run under its own control again.
When there is problem, the unit should be diagnosed in Service
Test mode. The alarms must be reset before the control function
can operate in either Normal mode or Service Test mode.
Alarms and Alerts
Viewing and Clearing Unit Alarms
Presence of active alarms will be indicated on the Scrolling
Marquee display by the Alarm Status light turning on and by the
number of active alarms being displayed in the automatic View of
Run Status. Presence of active alarms may also be signaled on the
Alarm Output terminals. Each alarm may also be broadcast on the
CCN network. Active alarms and past alarm history can be
reviewed and cleared via the local display or a CCN device. The
following menu locations are used for the local display:
AlarmsR.CURR (Reset All Current Alarms)
Change to YES to reset all active alarms. Turning unit power off
will also reset all current alarms.
AlarmsR.HIST (Reset Alarm History)
Change to YES to reset the alarm history. Turning unit power off
will not reset the alarm history.
AlarmsCURR (Currently Active Alarms)
Use the ENTER key, then scroll through any alarm numbers using
the up and down arrow keys. Alarms are displayed in numerical
order.
AlarmsHIST (Alarm History)
Use the ENTER key, then scroll through any alarm numbers using
the up and down arrow keys. Up to 20 alarms are displayed in
order of occurrence, with time and date.
The description for an alarm can be viewed on the Scrolling
Marquee display by pressing ESCAPE and ENTER keys
simultaneously while displaying the alarm code number. Be sure to
expand description for each code, because in some cases there are
different possible descriptions and causes for the same code
number.
Diagnostic Alarm Codes and Possible Causes
Alert Codes T051 and T055 (without Current Sensors)
These alerts can only be activated if set to Diagnose Compressor
Safety (Configuration COOL D.CMP = Yes). There are 4
different texts for each alert code. There are two different alerts
which have corresponding test mode alerts indicated with “Service
Test” in the expanded text. Pressing enter and esc on the marquee
or navigator to expand the T051 and T055 alert will show you one
of the below alerts. Make sure the expanded text is read correctly
before troubleshooting. Alert codes T051 and T055 are for
compressors A1 and B1 respectively.
S Compressor Safety T
rip
These alerts occur when the respective compressor has been
running for 25 sec and the Saturated Suction Pressure (Pressures
SSP.A or SSP.B) reflects a change in compressor operation. A
change in compressor operation is when the SSP changes more
than the Maximum Suction Change configuration (Configuration
COOL MX.SA or MX.SB) in a two second window while
running the compressor and persists for 40 seconds. This alert can
also occur when the respective compressor is diagnosed with a
high pressure switch trip. A high pressure trip is when the
compressor suction rises and falls two times within 2 minutes.
When this occurs, the control turns off the compressor and logs a
strike for the respective circuit. These alerts reset automatically.
The possible causes are: high--pressure switch (HPS) open,
Condensate overflow switch (COFS) open, compressor internal
protection is open, or a wiring error (a wiring error might not allow
the compressor to start). The HPS and optional COFS are wired in
series with compressor relays on the MBB. If one of these opens
during compressor operation, the compressor stops causing the
control to activate this alert.
S Compressor Detected After Turnof
f
These alerts occur when the respective compressor is turned off but
the Saturated Suction Pressure (Pressures SSP.A or SSP.B) does
not reflect a shutdown. When shutting down a compressor suction
pressure must rise more than Maximum Suction Change
configuration (Configuration COOL MX.SA or MX.SB)
within the first 10 seconds and stay above it. When this occurs, the
control turns off all of the compressor relays, stays in cooling mode
and keeps the indoor fan on. Use the Scrolling Marquee to reset the
alert. The possible causes are a welded contactor, frozen
compressor relay on MBB, or adverse conditions.
Alert Codes T051 and T055 (with Current Sensors)
These alerts can only be activated if Current Sensing A1 or B1 is
enabled (Configuration COOL CS.A1 or CS.B1 = Enabled).
There are 4 different texts for each alert code. There are two
different alerts which have corresponding test mode alerts indicated
with “Service Test” in the expanded text. Pressing enter and esc on
the marquee or navigator to expand the T051 and T055 alert will
show you one of the below alerts. Make sure the expanded text is
read correctly before troubleshooting. Alert codes T051 and T055
for compressors A1 and B1 respectively.
S Compressor Safety T
rip
These alerts occur when the Current Sensor (CS) does not detect
compressor current during compressor operation. When this
occurs, the control turns off the compressor and logs a strike for the
respective circuit. These alerts reset automatically. The possible
causes are: high-pressure switch (HPS) open, Condensate overflow
switch (COFS) open, compressor internal protection is open, or a
wiring error (a wiring error might not allow the compressor to
start). The HPS and optional COFS are wired in series with
compressor relays on the MBB. If one of these opens during
compressor operation, the compressor stops causing the control to
activate this alert.
S Compressor Detected After Turnof
f
These alerts occur when the Current Sensor (CS) detects current
when the compressor should be off. When this occurs, the control
turns off all of the compressor relays, stays in cooling mode and
keeps the indoor fan on. Use the Scrolling Marquee to reset the
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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