Supply air temperature is -40

Issue:

Supply air temperature is -40

Resolution:

For commercial voyagers, the CCP uses this rooftop supply air sensor on the CCP display and for the control. Be sure there is a sensor wired on the RTOM.

For Voyager 1's, 2's, and Precedents, the CCP uses the sensor on the bypass UCM on the CCP display and for the control.

The CCP sees the unit as a CV unit and also a commercial unit, so it's changeover bypass, but it doesn't use the bypass values. You must have the following:

• Discharge air sensor at the unit - connected at the RTOM (if not you'll see -40 for SAT)
• Valid temperature at bypass SAT (if not, the CCP will be in priority shutdown)
• Valid temperature at MAT on economizer module (if not, you'll see ??? for SAT)

 

For Voyagers with Reliatel controls and TCI communications, the SAT is reported from the MAT input on the ECA module, not J4 on the RTOM.

 

Other Question/Problem/Cause Statements:

• Supply air temperature is -40
• Constant Volume Commercial Voyager on CCP III
• Can a CCP II talk to a commercial voyager CV?
• Supply air temperature is question marks

Facts:

• VOYAGER/PRECEDENT
• VariTrac III Central Control Panel (CCP)
• Voyager/Precedent nonLonTalk
• VariTrac II Central Control Panel (CCP)
• Tracer Summit (Windows)

Original wave: wave21339