39
Table 3. Alarm Faults
Alarm
Mgr
Alarm
ID
Category
Alert
Level
(Severe,
Low,
Info)
Local
Display:
Alert Title
Local Display: Alert
Detailed Description
M3-Specific
Description
IMC Error Description
IMC Action
121
Power
Low
Line Freq
Mismatch
Line frequency does not match
the frequency indicated by the
model number.
Line Freq
Mismatch
Reserved.
122
Controller Power
Low
24Vac Primary
Voltage Low
Low output voltage on T1
transformer. Alarm set when
calculated RMS voltage is
below 18VAC for more than two
seconds.
24Vac Primary
Voltage Low
Reserved.
123
Controller Power
Low
24Vac Primary
Voltage High
High output voltage on T1
transformer. Alarm set when
calculated RMS voltage is
above 30VAC for more than two
seconds.
24Vac Primary
Voltage High
Reserved.
124
Controller Power
Low
24Vac Secondary
Voltage Low
Low output voltage on T18
transformer. Alarm set when
calculated RMS voltage is
below 18VAC for more than two
seconds.
24Vac Secondary
Voltage Low
Reserved.
125
Controller Power
Low
24Vac Secondary
Voltage High
High output voltage on T18
transformer. Alarm set when
calculated RMS voltage is
above 30VAC for more than two
seconds.
24Vac Secondary
Voltage High
Reserved.
126
Power
Low
Line Phasing
Mismatch
Line Phasing does not match
the phasing indicated by the
model number.
Line Phasing
Mismatch
Reserved.
127
General Fault
Info
Alarm buffer
overflow
Alarm buffer overflow
Reserved
Alarm buffer overflow
Not all alarms stored
128
Controller Power
Low
24vac
Secondary power
loss
Secondary 24vac power loss
Reserved
Secondary 24vac power loss
129
Cooling
Low
VFD
Shutdown
VFD fault detected. Check belt
and for blower overload.
Vfd Shutdown
< Not implemented in IMC >
130
Cooling
Low
VFD Bypass
Engaged
VFD bypass mode. Mode is
engaged. Blower may or may
not be disengaged.
VFD Bypass
Engaged
< Not implemented in IMC >
132
Cooling
Low
VFD FD Bypass
Unconfig
VFD bypass mode has not
been selected. Unit operates as
if bypass is not installed.
VFD Bypass
Unconfig
< Not implemented in IMC >
133
Reserved
134
Air Flow
Low
Low Supply
Airflow
RTU indicates airflow target
cannot be achieved.
Low Supply Airflow
< Not implemented in IMC >
135
Air Flow
Low
No Supply
Airflow
Blower RPM is too low
indicating that the blower is not
working.
No Supply Airflow
< Not implemented in IMC >
136
Economizer
Low
OA Damper
Mech Fault
Outdoor air damper stuck or
actuator problem.
OA Damper Mech
Fault
< Not implemented in IMC >
137
Air Flow
Low
Low Outdoor
Airflow
Outdoor airflow is too low so
the building is not getting the
designed outdoor airflow based
on IAQ.
Low Outdoor
Airflow
< Not implemented in IMC >