Specifications

30
Alert Codes 102, 103, 104 (Current Sensor Failure)
— Alert
codes 102, 103, and 104 are for compressors A1, B1, and C1,
respectively. This alert occurs when the output of the current
sensor is a constant high value. The alert resets automatically.
The cause of the alert is a wiring error or a loose connection. If
the problem cannot be resolved and the CS board must be
replaced, the CS board can be temporarily disabled while
securing a replacing board. A CS board is disabled by setting
the corresponding configuration to DISABLE (CS.A1, CS.B1
or CS.C1).
Alert Codes 110, 111, 140 (Loss of Charge)
— Alert codes
110, 111, and 140 are for circuits A, B and C, respectively. This
alert occurs when the compressor is off and the suction
pressure < 5 psig and OAT > –5 F for 1 continuous minute. Use
the Scrolling Marquee to reset the alert. The cause of the alert
is usually low refrigerant pressure or a faulty suction pressure.
These alerts only occur when the compressor is off because the
low refrigerant pressure alarms (alerts 133, 134 and 141)
handle this situation when the compressor is operating.
Alert Codes 126, 127, 142 (High Refrigerant Pressure)
— Alert
codes 126, 127, and 142 are for circuits A, B, and C, respec-
tively. These alerts occur when alerts 51, 55, or 59 are active
while the appropriate condensing temperature is greater than
150 F. Use the Scrolling Marquee to reset the alert. The cause
of the alarm is usually an overcharged system, high outdoor
ambient temperature coupled with dirty outdoor coil, plugged
filter drier, or a faulty high pressure switch. See Alerts 51, 55
and 59 for diagnostic procedure.
Alert Codes 133, 134, 141 (Low Refrigerant Pressure)
— Alert
codes 133, 134, and 141 are for circuits A, B and C, respective-
ly. These alerts occur when the compressor is operating and the
evaporating temperature (converted from the suction pressure)
is less than 20 F for 5 minutes, 15 F for 3 minutes, or 10 F for
1.5 minutes. When the outdoor temperature is less than 40 F, the
above values are reduced by an offset that scales between 0 and
10 as the outdoor temperature goes from 40 to 0° F. These alerts
cause a strike for the respective circuit. These alerts will activate
when the coil becomes frosted. However, during the 15-minute
reset period, the coils will thaw and strike should clear at restart
if there is nothing else wrong with the circuit. The alert resets
automatically. The cause of the alert is usually low refrigerant
charge, dirty filters, evaporator fan operating backwards, loose
or broken belt, plugged filter drier, faulty transducer, excessive-
ly cold return air, or stuck open economizer when the ambient
temperature is low.
Alert Code 140 (Loss of Charge)
— See Alert 110.
Alert Code 141 (Low Refrigerant Pressure)
— See Alert 133.
Alert Code 142 (High Refrigerant Pressure)
— See Alert 126.
Alert Codes 143, 144, 145 (Failure to Pressurize)
— Alert
codes 143, 144, and 145 are for circuits A, B, and C, respec-
tively. This alert occurs when the compressor turns on and the
suction pressure does not drop 5 psig during the first 15 sec-
onds and the condensing temperature does not rise 5 F during
the first minute. These alerts cause a strike for the respective
circuit. The alert resets automatically. The cause of the alert is
usually compressor wiring causing reverse rotation or a faulty
compressor.
Alarm Codes 163, 164, 165 (Circuit Failure)
— Alarm codes
163, 164, and 165 are for circuits A, B, and C, respectively.
This alarm occurs when a circuit has 3 strikes. Use the
Scrolling Marquee display to reset the alarm. Investigate the
alarm that caused the strikes to occur.
Alert Code 179 (Com. Failure with ECB)
— This alert occurs
when the MBB cannot communicate with the ECB. This is
usually caused by a wiring problem. Investigate using the Low
Voltage Schematic.
Alert Codes 180 (Com. Failure with Economizer Actuator)
—
This alert occurs when the MBB cannot communicate with the
Belimo Actuator. This is usually caused by a wiring problem.
Investigate using the Low Voltage Schematic.
Alarm Code 404 (Fire Shutdown)
— This alarm occurs when
the Shutdown Input is either open or closed depending upon its
configuration. This alarm is usually caused by an auxiliary
device that is trying to shut down the unit, e.g. smoke detector.
The configuration for this switch input can be found at variable
FS.SW. Verify that the configuration is set correct, verify the
wiring and auxiliary device. This alarm resets automatically.
Alert Code 408 (Dirty Air Filter)
— This alert occurs when
the Filter Status switch senses a plugged filter for 120 continu-
ous seconds after the indoor fan has been running for 10 sec-
onds. Because the Dirty Air Filter switch can be configured
normally opened or closed, the switch might be open or closed.
The configuration for this switch input can be found at variable
FL.SW. Verify that the configuration is set correct, verify the
wiring and fan status switch. The hose should be connected to
the low side of the switch. This alert resets automatically.
Alert Code 409 (Fan Feedback On When Not Expected)
—
This alert occurs when the Fan Feedback signal has been On
for more than 5 seconds yet the Fan Power relay is Off. Verify
wiring.
Alert Code 409 (Fan Feedback Off When Not Expected)
—
This alert occurs when the IDF has been on for more than
15 seconds yet the Fan Feedback is Off. Verify wiring.
Compressors will not be allowed to run until this alert clears.
Check for errors on the IGC which might have caused the IDF
to turn off.
Alert Code 410 (R-W1 Jumper Alarm)
— This alert occurs
when the control mode is Space Temperature Mode via Auto
Select or Space Temp Select yet there is no power to W1. Veri-
fy that space temperature mode is the desired mode or add
jumper between R and W1. This alert resets automatically.
Alert Code 411 (Y2 without Y1)
— This alert occurs in
Thermostat mode when Y2 is energized and Y1 is not. Verify
thermostat and thermostat wiring. When Y2 turns On, the soft-
ware will behave as if Y1 and Y2 are both On. When Y2 turns
Off, the software will behave as if Y1 and Y2 are both Off.
This alert resets automatically when Y1 is turned On.
Alert Code 412 (W2 without W1)
— This alert occurs in
Thermostat mode when W2 is energized and W1 is not. Verify
thermostat and thermostat wiring. When W2 turns On, the soft-
ware 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.
Alert Code 413 (Y and W Simultaneously)
— This alert
occurs in Thermostat mode when Y1 or Y2 is energized simul-
taneously 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 simultaneous-
ly with W1 and W2.