Carrier 48FC Series Controls, Start-Up, Operation And Troubleshooting page 29

Alert A130 – CIR.A SSP SENSOR RANGE
This alert occurs when the pressure is outside the range - -6.7 to 420
psig. A circuit cannot run when this alert is active. The cause of the
alert is usually a faulty transducer, faulty 5- -v power supply, or a
loose connection. Use the transducer voltage drop table to
determine where the error is introduced.
Alert A131 – CIR.A SSP OPEN SENSOR
See Alert A130
Alert A132 – CIR.A SSP SHORT SENSOR
See Alert A130
Alert A133 – CIR.A SDP SENSOR RANGE
This alert occurs when the pressure is outside the range 14.5 to 667
psig. A circuit cannot run when this alert is active. The cause of the
alert is usually a faulty transducer, faulty 5- -v power supply, or a
loose connection. Use the transducer voltage drop table to
determine where the error is introduced.
Alert A134 – CIR.A SDP OPEN SENSOR
See Alert A133
Alert A135 – CIR.A SDP SHORT SENSOR
See Alert A133
Alert 150 - - OACFM OPEN SENSOR
This alert occurs when the Outdoor Air CFM sensor input is 0 mA
and the sensor is configured and installed. Check sensor and
wiring. This alert clears automatically.
Alert 151 - - OACFM SHORTED SENSOR
This alert occurs when the Outdoor Air CFM sensor input shorted
and the sensor is configured as installed. Check sensor and wiring.
This alert clears automatically.
Alert A160 – OARH OPEN SENSOR
This alert occurs when the Outdoor Air Relative Humidity sensor
input is 0 mA and the sensor is configured as installed. Outside Air
Enthalpy cannot be calculated therefore no enthalpy crossover can
be used and only dry bulb will be used in determining free cooling.
Check sensor and wiring. This alert clears automatically.
Alert A161 – OARH SHORTED SENSOR
This alert occurs when the Outdoor Air Relative Humidity sensor
input shorted and the sensor is configured as installed. Outside Air
Enthalpy cannot be calculated therefore no enthalpy crossover can
be used and only dry bulb will be used in determining free cooling.
Check sensor and wiring. This alert clears automatically.
Alert A162 – RARH OPEN SENSOR
This alert occurs when the Return Air Relative Humidity sensor
input is 0 mA and the sensor is configured as installed. Return Air
Enthalpy cannot be calculated therefore no differential enthalpy
crossover can be used. Dry bulb and single enthalpy will be used in
determining free cooling. Check sensor and wiring. This alert
clears automatically.
Alert A163 – RARH SHORTED SENSOR
This alert occurs when the Return Air Relative Humidity sensor
input shorted and the sensor is configured as installed. Return Air
Enthalpy cannot be calculated therefore no differential enthalpy
crossover can be used. Dry bulb and single enthalpy will be used in
determining free cooling. Check sensor and wiring. This alert
clears automatically.
Alert A164 - - IAQ OPEN SENSOR
This alert occurs when the IAQ input is 0 mA and the sensor is
configured as installed. IAQ operation will be disabled. Check
sensor and wiring. This alert clears automatically.
Alert A165 - - IAQ SHORTED SENSOR
This alert occurs when the IAQ input is shorted and the sensor is
configured as installed. IAQ operation will be disabled. Check
sensor and wiring. This alert clears automatically.
Alert A166 - - OAQ OPEN SENSOR
This alert occurs when the OAQ input is 0 mA and the sensor is
configured as installed. OAQ operation will be disabled. Check
sensor and wiring. This alert clears automatically.
Alert A167 - - OAQ SHORTED SENSOR
This alert occurs when the OAQ input is shorted and the sensor is
configured as installed. OAQ operation will be disabled. Check
sensor and wiring. This alert clears automatically.
Alert A168 - - SPACE RELATIVE HUMIDITY OPEN SENSOR
This alert occurs when the SPRH input is 0 mA and the sensor is
configured as installed. Check sensor and wiring. This alert clears
automatically.
Alert A169 - - SPACE HUMIDITY SHORTED SENSOR
This alert occurs when the SPRH input is shorted and the sensor is
configured as installed. Check sensor and wiring. This alert clears
automatically.
Alert A170 – ECON FEEDBACK RANGE
This alert occurs when the Economizer analog feedback signal is
outside the range of 1.3vdc to 10.3vdc and the feedback is
configured to use. A short is 10.5vdc and an open circuit is less
than 0.1vdc. Economizer diagnostics operation will be disabled.
This is usually caused by a wiring problem, actuator failure, or the
wrong actuator. Investigate using the Low Voltage Schematic;
make sure the feedback signal from the actuator is correct. This
alert clears automatically.
Alert A171 – ECON FEEDBACK OPEN
See Alert A170
Alert A172 – ECON FEEDBACK SHORTED
See Alert A170
Alert A190 – TSTAT HEAT/COOL CALLS
This alert occurs in Thermostat mode when Y1 or Y2 is energized
simultaneously with W1 or W2. Verify thermostat and thermostat
wiring. The software will enter either the cooling or heating mode
depending upon which input turned on first. This alert resets
automatically when Y1 and Y2 are not on simultaneously with W1
and W2.
Alert A191 – TSTAT IMPROPER COOL
This alert occurs in Thermostat mode when Y2 or Y3 is energized
and Y1 is not. Verify thermostat and thermostat wiring. When this
occurs the control will treat the inputs as a number instead of
specific input. Example a Y2 and Y3 would mean 2 cooling inputs
so the control would treat that as is a Y1 and Y2 was active. This
alert resets automatically when Y1 is turned On.
Alert A192 – TSTAT IMPROPER HEAT
This alert occurs in Thermostat mode when W2 is energized and
W1 is not. Verify thermostat and thermostat wiring. When W2
turns On, the software will behave as if W1 and W2 are both On.
When W2 turns Off, the software will behave as if W1 and W2 are
both Off. This alert resets automatically when W1 is turned On.
Fault F200 – FIRE SHUTDOWN
This fault occurs when the fire shutdown input is either open or
closed depending upon its configuration. This fault is usually
caused by an auxiliary device that is trying to shut down the unit,
e.g., smoke detector. This will cause a unit shutdown condition.
Verify that the configuration is set correct, verify the wiring and
auxiliary device. This fault resets automatically.
Fault F201 – CONDENSATE OVERFLOW
This fault occurs when the COFS input is either open or closed
depending upon its configuration. This fault is usually caused by
water reaching a high level in the drain pan. This will cause a
cooling lockout. Verify that the configuration is set correct, verify
the wiring and auxiliary device. This fault resets automatically.
29