I am replacing an older Honeywell with a Neptronic TRO24T4XYZ1.
I have 24V AC going to Pin 4 and common going to Pin 1. Unit powers up fine
I have my demands (w, y and g) hooked up to TO1, TO2 and TO3 (pin 6, 8, 9)
OK so my issue is the old Honeywell had no problems sending a 24v demand signal to the HVAC board. But when I use the neptronic, I read only 20 volts at the control board which is not enough to trigger the operation. The HVAC board is just a regular NO style board that requires a 24v demand. I am a little confused at the available signal types the neptronic offers and the manual is not very helpful for configuration or troubleshooting.
The available signal modes are triac based on/off floating or pulse. I am using on/off, and I do not understand what is causing the reduced voltage on the demand, the thermostat is not very far from the hvac board and the old thermostat had no problem when closing the contact... am I just doing something wrong, any help or advice would be greatly appreciated