120
Table 92 — Alert and Alarm Codes (cont)
T082 (Space Temperature Offset Sensor Failure)
— When
this failure occurs, there is no offset available that may be ap-
plied to space temperature. Recovery from this alert is automat-
ic. Reason for error is either a faulty slider potentiometer, wir-
ing error, or damaged input on the MBB control board.
T090 (Circ A Discharge Press Transducer Failure)
T091 (Circ B Discharge Press Transducer Failure) — The
associated circuit becomes disabled whenever this transducer
(Pressures
REF.P
DP.A, DP.B) fails. Recovery from this
alert is automatic. Reason for error is either a faulty sensor, wir-
ing error, or damaged input on the MBB control board.
T092 (Circ A Suction Press Transducer Failure)
T093 (Circ B Suction Press Transducer Failure) — The as-
sociated circuit becomes disabled whenever this transducer
(Pressures
REF.P
SP.A, SP.B) fails. Recovery from this
alert is automatic. Reason for error is either a faulty sensor, wir-
ing error, or damaged input on the MBB control board.
T094 (Circuit A EXV1 Thermistor Failure
T095 (Circuit A EXV2 Thermistor Failure — The associat-
ed circuit becomes disabled whenever this thermistor (Tem pe r-
atures
REF.T
ASX1, ASX2) fails. Recovery from this alert
is automatic. Reason for error is either a faulty sensor, wiring
error, or damaged input on one of the EXV control boards.
T096 (Circuit B EXV1 Thermistor Failure
T097 (Circuit B EXV2 Thermistor Failure — The associated
circuit becomes disabled whenever this thermistor (Tempe ra-
tures
REF.T
BSX1, BSX2) fails. Recovery from this alert
is automatic. Reason for error is either a faulty sensor, wiring
error, or damaged input on one of the EXV control boards.
ALARM
OR
ALERT
NUMBER
DESCRIPTION ACTION TAKEN BY CONTROL RESET METHOD
A644 Heat Coil Actuator Hunting Excessively alarm only Automatic
A650 Bldg.Press. Actuator 1 Out of Calibration Alarm only Automatic
T650 Economizer 3 Actuator Out of Calibration Alarm only Automatic
A651 Bldg.Press. Actuator 1 Comm Failure No building pressure control Automatic
T651 Economizer 3 Actuator Comm Failure No economizer functions Automatic
A652 Bldg.Press. Act. 1 Control Range Increased Alert only Automatic
T652 Economizer 3 Actuator Control Range Increased Alert only Automatic
A653 BP Act. 1 Overload, Setpnt Pos Not Reached Alarm only Automatic
T653 Econ3 Overload, Setpt Not Reached Alarm only Automatic
A654 Bldg.Press. Actuator 1 Hunting Excessively Alert only Automatic
T654 Econ3 Actuator Hunting Excessively Alert only Automatic
T655 Econ 3 (Outside 2) Not Economizing When it Should Alert only Automatic
T656 Econ 3 (Outside 2) Economizing When it Should Not Alert only Automatic
T657 Econ 3 (Outside 2) Damper Stuck or Jammed Alert only Automatic
A660 Bldg.Press. Actuator 2 Out of Calibration Alarm only Automatic
A661 Bldg.Press. Actuator 2 Comm Failure No building pressure control Automatic
T662 Bldg.Press. Act. 2 Control Range Increased Alert only Automatic
A663 BP Act. 2 Overload, Setpnt Pos Not Reached Alarm only Automatic
A664 BP Actuator 2 Hunting Excessively Alert only Automatic
A700 Air Temp Lvg Supply Fan Thermistor Failure Unit shut down Automatic
T701 Staged Heat 1 Thermistor Failure Average remaning sensors Automatic
T702 Staged Heat 2 Thermistor Failure Average remaning sensors Automatic
T703 Staged Heat 3 Thermistor Failure Average remaning sensors Automatic
A704 Staged Heat Lvg Air Temp Sum Total Failure No staged heat function Automatic
T705 Limit Switch Thermistor Failure No software limit switch function Automatic
A706 Hydronic Evap Discharge Thermistor Failure Unit shut down Automatic
T707 Digital Scroll Discharge Temperature Failure Digital compressor A1 llimited to 50% Automatic
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
-30 -20 -10 0 10 20 30 40 50 60 70 80
SST (F)
SDT (F)
Fig. 22 — High Pressure/SCT Alarm Upper Envelope
a48-8508
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