What happens when the auxiliary temperature is open or short in Trane VAV-UCM 4.2 Control Unit?
If the auxiliary temperature is open or short, the Tracer supplied data is used for auto changeover logic in Trane Control Unit.
What happens if the supply air pressure is open or short in Trane VAV-UCM 4.2 in VariTrac Bypass Damper mode?
For UCM 4 in bypass damper mode: if the SAP input is shorted or open, the Failed SAP sensor failure flag will be set.
What happens if the supply air temperature is open or short in Trane Control Unit in VariTrac Bypass Damper mode?
For UCM 4 in bypass damper mode: if the SAT input is shorted or open, the Failed SAT sensor failure flag will be set.
What happens if the C02 value is less than 200 ppm in Trane VAV-UCM 4.2 Control Unit?
For UCM 4 with the aux input configured for C02 mode: if the C02 input is shorted or reading below 200 ppm, the Failed C02 sensor failure flag will be set.
What happens if the thumbwheel setpoint is open or short in Trane VAV-UCM 4.2 Control Unit?
If the thumbwheel setpoint is open or short and there are no active wireless sensors, setpoints from EEPROM are used.
General| Series | VAV-UCM |
|---|---|
| Version | 4.2 |
| Input Voltage | 24 VAC |
| Communication Protocol | BACnet MS/TP |
| Product Type | VAV Controller |
Describes the UCM 4.2, its function as a DDC controller for VAV units, and its capabilities.
Details essential pre-power checks to ensure safe and correct installation of the UCM 4.2.
Provides instructions and safety precautions for connecting power to the UCM 4.2 unit.
Provides a step-by-step procedure for installing and associating wireless sensors with receivers.
Describes the operational logic and control sequences for single duct VAV units.
Explains various failure conditions that the UCM can detect and the corresponding operating sequences.
Covers procedures for balancing the air distribution system of VAV units using VariTrane units.
Explains diagnostic logs, tables, and failure parameters for system troubleshooting.
Addresses UCM operational failures and communication loss procedures between UCM and Tracer Summit.
Details troubleshooting for wired and wireless zone sensor and setpoint reading errors.
Guides on diagnosing and resolving issues with airflow readings and VAV damper operation.
Covers troubleshooting for VAV fan and electric/hot water heat output failures.
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