Issue
The documentation notes a TC900 can be changed from a 4-pipe system with a 2-wire motorized valve to a 2-pipe system with a 3-wire motorized valve. What parameter changes are required?
Product Line
Field Devices
Environment
- TC907-3A4LAB
- TC907-3A4LMAB
- TC907-3A4DLSAB
- TC907-3A4DLMSAB
- TC907-4FMSAB
- TC907-3A4DPSAB
- TC907-3A4DPMSAB
- TC907-3A4DPMSA-24B
- TC907-4FMSA
- TC907-3A4LMA
- TC907-3A4LA
- TC907-3A4DPSA
- TC907-3A4DPMSA-24
- TC907-3A4DPMSA
- TC907-3A4DLSA
- TC907-3A4DLMSA
Cause
Documentation is unclear in how a TC900 is configured to use a 3-wire valve actuator
Resolution
- Access the parameter settings by pressing and holding the mode button for six seconds during thermostat power up.
- Press the mode button or Fan button to move forward or backward between the parameters until parameter 09 is displayed.
- Press the up and down buttons to set the parameter to 04.
