Trane Tracer AH540 - Page 102

Chapter 6 Verifying operation and communication
92 CNT-SVX05B-EN
Space Temperature Failure
(service required; nonlatching)
Discharge air temperature con-
trol
Supply fan: Normal operation
Valves: Normal operation
DX cooling/Electric heat: Normal operation
Outdoor air damper: Normal operation
Face and bypass damper: Normal operation
Exhaust fan: Normal operation
Humidity Input Failure
(service required; nonlatching)
Duct Static Press Failure
(informational; nonlatching)
Discharge air temperature con-
trol
Humidity Input Failure
2
(critical or service required;
nonlatching)
Space temperature control
Entering Water Temp Failure
2, 6
(critical or service required;
nonlatching)
Local Space Setpoint Failure
(service required; nonlatching)
Space temperature control
Discharge air temperature con-
trol
Dirty Filter
(informational; nonlatching)
Maintenance Required
(informational; latching)
Local Fan Switch Failure
(informational; latching)
CO
2
Sensor Failure
(informational; nonlatching)
Generic Temperature Failure
(informational; nonlatching)
Evaporator Refrigerant Temp
Failure
(informational; nonlatching)
Normal
(informational)
1
If the freezestat device sending the Low Temp Detect diagnostic requires a manual reset, first reset the freezestat device and
then reset the controller.
2
This diagnostic can be configured as a service required alarm or a critical alarm.
3
When a local temperature, setpoint, or pressure sensor has failed after being valid, the controller generates a diagnostic to
indicate the sensor loss condition. Because this is a latching diagnostic, the controller automatically clears the diagnostic once
a valid sensor value is present.
4
A Space Temperature Failure diagnostic disables morning and daytime warm-up sequence of operation when the controller is
configured for constant volume discharge air control or variable-air-volume control.
5
If the outdoor air temperature sensor or the mixed-air sensor fails or is not present, economizer operation is disabled and the
outdoor air damper is opened to its minimum position.
6
If the entering water temperature sensor fails, Tracer AH540/541 operation will default to heating mode.
Table 63. Tracer AH540/541 diagnostics (continued)
Diagnostic Configuration Outputs