I got my furnace and A/C unit replaced last summer. The new furnace has 2-stage heating, the A/C unit is single stage. The installers put in a single stage thermostat, so as far as I could tell it was running as a single stage. I saw that the original wiring consisted of 4 wires, and wanting to make use of the 2 stages of heating, I ran a 5 wire cable, so I have 9 wires total.
For the thermostat, I have an Energate Foundation. It supports up to 2-stage heating and 2-stage cooling. Here are my connections:
This is the diagram pretty much as it is in the installation manual. (Edit: from the furnace installation manual)
The furnace is Carrier 59TP6A. A/C unit is also Carrier.
Then I go to test the system and when the thermostat calls for cooling, the blower comes on but on low speed. The A/C unit does not come on.
I am aware of the DIP switch to allow use of a 2-stage thermostat, so I switched that to ON. I did not touch the ACRDJ jumper, it is only to be removed if 2-stage cooling is present, at least that's how I understand it. (As an aside, I tried with and without and it didn't make any difference)
The A/C unit and furnace themselves are working fine, they were on a single stage thermostat just the other day, and worked. They are mechanically sound. To make sure my new wiring was ok, I removed the thermostat from the wall, and connected (jumped) R to G and Y/Y2, and everything worked as expected, ie the fan was on at full speed and the A/C unit came on. For some reason, the thermostat isn't energizing its Y/Y2 terminal which would turn on the A/C unit.
Since this is a smart thermostat, I did go through the software menu, and changed the settings so that it is aware that the equipment consists of 2-stage heating and 1-stage cooling.
Anyone familiar with the Energate Foundation thermostats and why it's behaving this way?