[Hai-users] Trane and RC80B thermostat problems

[Brad]

Commercial building:

Had RC80B and RC100B thermostats installed in this location for about 7 yrs.

All were installed NOT using the C terminal as C terminal was never wired at
the roof top units.

All has worked just fine until now.

 

Had to replace the three Roof Top HVAC units. New units are Trane.

 

Now the thermostats will not work correctly.

I measure 16.2 volts AC across R & C terminals.

I measure 24.3 volts across any of the other terminals & R.

 

Two of the RC80 thermostats power up. But will not control the HVAC units.

They call for heat, but nothing happens at unit.

 

When in AC mode, they call for cool, fan comes up but compressor never kicks
on.

 

The RC110 does not power up, appears dead. But if I hook it up to a 24VAC
transformer, it test's out just fine.

 

My question, will the HAI thermostat power boasters part# 30A00-2 solve
this?

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