Critical alarms - Johnson Controls - LIT-12011950 - Building automation software - Smart Equipment Controller - 5.0

Smart Equipment Controls Sequence of Operation Technical Bulletin

Product name
Smart Equipment Controller
Document type
Technical Bulletin
Document number
LIT-12011950
Version
5.0
Revision date
2024-06-06
Product status
Active
Table 1. Critical Alarms
Alarm Reason for activation
C1 Locked Out Due to High Pressure Three HPS1 trips within two hours
C2 Locked Out Due to High Pressure Three HPS2 trips within two hours
C3 Locked Out Due to High Pressure Three HPS3 trips within two hours
C4 Locked Out Due to High Pressure Three HPS4 trips within two hours
C1 Locked Out Due to Low Pressure Three LPS1 trips within one hour
C2 Locked Out Due to Low Pressure Three LPS2 trips within one hour
C3 Locked Out Due to Low Pressure Three LPS3 trips within one hour
C4 Locked Out Due to Low Pressure Three LPS4 trips within one hour
C1 Locked Out Due to Coil Freeze Three FS1 trips within two hours. Evap Coil Temp < Evap Coil Temp Cutout SP
C2 Locked Out Due to Coil Freeze Three FS2 trips within two hours. Evap Coil Temp < Evap Coil Temp Cutout SP
C3 Locked Out Due to Coil Freeze Three FS3 trips within two hours. Evap Coil Temp < Evap Coil Temp Cutout SP
C4 Locked Out Due to Coil Freeze Three FS4 trips within two hours. Evap Coil Temp < Evap Coil Temp Cutout SP
Exhaust Fan VFD Failure EX VFD BI trips. Must be set up as Exhaust or Variable Frequency Fan
HS1 Locked Out Due to Limit Switch Three LS1 trips within one hour
HS2 Locked Out Due to Limit Switch Three LS2 trips within one hour
HS3 Locked Out Due to Limit Switch Three LS3 trips within one hour
Unit Shutdown Due to Smoke, etc SD input loses 24 VAC
Supply Fan VFD Failure Fan VFD Input trips. Must be set up as NOT Single Speed
No Heat-Cool Due to Unreliable Space-T Input Unreliable
4-Stage Communication Failure 4-Stage board goes from Online to Offline
Economizer Communication Failure Economizer board goes from Online to Offline
Outputs Disabled Due to Low Input V Blackout Conditions
Outputs Limited Due Brownout Input V Brownout Conditions
Unit Locked Out Due to APS Three APS trips within 1.5 hours. If APS is installed or based on Duct Pressure if Variable Speed Fan enabled
Unit Locked Out Due to Supply Fan OL Three FAN OVR trips within two hours
Unit Locked Out Due to High Duct-P Duct Static Pressure is greater than the High Duct Static Pressure Setpoint
Freeze Protect Disabled - Bad Sensor One of the Evaporator Coil Temperature sensors is unreliable
C1 Locked Out - Exceeded Op Env Limits Three envelope trips within two hours
C1 Locked Out Due to Oil Switch Oil Level Sensor does not detect oil
C1 Locked Out Due to VFD Failure VSCOMP-A input on the FDD controller reads 0V
C1 Locked Out - High Discharge Pressure Three high Discharge Line Pressure 1 trips within two hours
C1 Locked Out - Low Suction Pressure Three low Suction Line Pressure 1 trips within two hours
C2 Locked Out - High Discharge Pressure Three high Discharge Line Pressure 2 trips within two hours
C2 Locked Out - Low Suction Pressure Three low Suction Line Pressure 2 trips within two hours
C3 Locked Out - High Discharge Pressure Three high Discharge Line Pressure 2 trips within two hours
C3 Locked Out - Low Suction Pressure Three low Suction Line Pressure 2 trips within two hours
C4 Locked Out - High Discharge Pressure Three high Discharge Line Pressure 1 trips within two hours
C4 Locked Out - Low Suction Pressure Three low Suction Line Pressure 1 trips within two hours
Defrost Disabled - Bad Sensor At least one heat pump is installed, and one, or both of the condenser coil temperatures is unreliable
C1 Locked Out - High Discharge Line Temp Discharge Line Temperature 1 exceeded 245°F
A2L Leak Detector Alarm R454B input reads 0V
A2L Leak Detector Alarm-Lockout Three R454B trips within two hours
Cooling Locked Out - Condensate Overflow COND-A input reads 0V