| Duct Pressure Sensor Failure |
Input Unreliable and Variable Speed Fan |
| Return Air Humidity Sensor Failure |
Input unreliable |
| Outdoor Air Humidity Sensor Failure |
Input unreliable |
| Supply Humidity Sensor Failure |
Input unreliable |
| Indoor Air Quality Sensor Failure |
Input unreliable |
| Outdoor Air Quality Sensor Failure |
Input unreliable |
| Fresh Air Intake Sensor Failure |
Input unreliable |
| Mixed Air Temp Sensor Failure |
Input unreliable |
| Space Indoor temp Sensor Failure |
Input unreliable |
| Space Offset Sensor Failure |
Input unreliable |
| C1 Shutdown Due to High Pressure |
HPS1 Trip |
| C2 Shutdown Due to High Pressure |
HPS2 Trip |
| C3 Shutdown Due to High Pressure |
HPS3 Trip |
| C4 Shutdown Due to High Pressure |
HPS4 Trip |
| C1 Shutdown Due to Low Pressure |
LPS1 Trip |
| C2 Shutdown Due to Low Pressure |
LPS2 Trip |
| C3 Shutdown Due to Low Pressure |
LPS3 Trip |
| C4 Shutdown Due to Low Pressure |
LPS4 Trip |
| C1 Shutdown Due to Coil Freeze |
FS1 Trip (Evap Coil Temp < Evap Coil Temp Cutout
SP) |
| C2 Shutdown Due to Coil Freeze |
FS2 Trip (Evap Coil Temp < Evap Coil Temp Cutout
SP) |
| C3 Shutdown Due to Coil Freeze |
FS3 Trip (Evap Coil Temp < Evap Coil Temp Cutout
SP) |
| C4 Shutdown Due to Coil Freeze |
FS4 Trip (Evap Coil Temp < Evap Coil Temp Cutout
SP) |
| Low Outdoor Air Temp Cooling Cutout |
OAT < OAT Cooling Cutout |
| Econ Economizing When it Should Not |
Economizer Damper % Command > Min OA Position + FDD Damper
Min Position Tolerance |
| Econ Not Economizing When It Should |
Economizer Damper % Command < Min OA Position |
| + FDD Damper Min Position Tolerance |
| Economizer Damper Not Modulating |
ABS(Economizer Damper % Command - Economizer Damper Position)
> FDD Economizer Damper Allowed Error |
| Economizer Letting In Excess Outdoor Air |
(Economizer Damper % Command > Min OA Position |
| + FDD Damper Min Position Tolerance AND Ramp Min OA)
OR |
| (Economizer Damper % Command > FDD Damper Min Position
Tolerance AND Ramp Closed) |
| HS1 Shutdown Due to Limit Switch |
LS1 Trip |
| HS2 Shutdown Due to Limit Switch |
LS2 Trip |
| HS3 Shutdown Due to Limit Switch |
LS3 Trip |
| HS1 Off Due to Gas Valve |
H1 with no GV1 for >=6 minutes |
| HS2 Off Due to Gas Valve |
H2 with no GV2 for >=6 minutes |
| HS3 Off Due to Gas Valve |
H3 with no GV3 for >=6 minutes |
| Dirty Filter |
DFS Trip |
| FDD 1 Communication Failure |
FDD Master Online -> Offline |
| FDD 2 Communication Failure |
FDD Slave Online -> Offline |
| Unit has Received a Purge Request |
PURGE-S on Econ trip |
| Excessive Supply Air Temp Cooling |
SAT < Excessive SAT Cooling Sp AND SAT Limit for Cooling
Enable |
| HS1 Gas Valve Failure |
GV1 on without H1 for >= 5 seconds |
| HS2 Gas Valve Failure |
GV2 on without H2 for >= 5 seconds |
| HS3 Gas Valve Failure |
GV3 on without H3 for >= 5 seconds |
| Excessive Supply Air Temp Heating |
SAT > Excessive SAT Heating SP AND SAT Air Temp Limit for
Heat Enabled |
| Space Temperature Cooling Alarm |
Space Temp > Operating Cooling SP for more than 60
minutes |
| C1 Refrigerant Flow Restriction |
FDD Alarm, see Table 1
|
| Hot H20 FS Open to Prevent Coil Freeze |
Hydronic Heating Enabled and (HW Freeze BI trip and
Unreliable OAT) or HW Freeze BI trip and OAT is less than
40°F |
| Hot H20 FS Opened When It Should Not |
Hydronic Heating Enabled and OAT is greater than 40°F and HW
Freeze BI trip |
| Space Temperature Heating Alarm |
Space Temp is less than Operating Heating SP for more than 60
minutes. |
| Not Economizing - No Supply Air Sensor |
Free Cooling Available and MA Sequencer = DAT Control and SAT
Unreliable or |
| SAT Unrealiable and MA Sequence = Zone Control and MA State =
Mech and Free Cooling Available or Tstat Only and Mech and Free
Cooling Available |
| Using Return Instead of Space Temp |
Effective Zone Source = Return Air Temp and Not TStat
Only |
|
Proof Of Air Flow With No Fan Command
|
APS is closed, but fan command is not given |
|
C1 Suction Pressure Sensor
Failure
|
Input unreliable
|
|
C1 Suction Temperature Sensor Failure
|
Input unreliable
|
|
C1 Discharge Pressure Sensor Failure
|
Input unreliable
|
|
C1 Discharge Temperature Sensor Failure
|
Input unreliable
|
|
C2 Suction Pressure Sensor Failure
|
Input unreliable
|
|
C2 Suction Temperature Sensor Failure
|
Input unreliable
|
|
C2 Discharge Pressure Sensor Failure
|
Input unreliable
|
|
C2 Discharge Temperature Sensor Failure
|
Input unreliable
|