Upgrading a Honeywell Thermostat T6169B Line Voltage to Ecobee3 Smart Thermostat

[Jeanbuyer]

Hey Guys,



I live in a one bedroom condo which has 3 Trane fan coil units. (2 units in the livingroom) connected to a Honeywell T6169B (Line Voltage) and (1 unit in my bedroom) also connected to a Honeywell T6169B. I've attached the photos here. I assume I will need a 24 volt transformer and a relay to do this job. Has anyone done this before and will this work?

[Thermostat]

It could be done. Does your FCU only heat or does it heat and cool? Is there a control valve in the piping? What is the line rating for the fan?

[Jeanbuyer]

Hi,

Thanks so much for your reply. The heating and cooling is switched over by the building seasonally. We have cooling during the summer until September or so. Then the building notifies us that it is switching over to heat. They give us about a weeks notice. It's an either or system. It Rated Voltage: 115 HZ 60 PH 1, Voltage Utilzation Rage: 104-126 VAC and the Blower Motor #1: 0.8 FLA 0.05 HP.

[Thermostat]

Is there a control valve in the piping for the the fan coil unit or does the water flow through the fan coil unit all of the time? Is the yellow and blue wires from the thermostat connected to the same wire nut?

[Jeanbuyer]

Hi,

Thanks for your email. The water flows through the fan coil unit all the time. The condo building changes it over from warm to cool in the summer. There is a fan switch with 3 different speeds. Yes, the yellow and blue are connected together.

[Jeanbuyer]

The fan coil in the bedroom is

Rated Voltage: 115 HZ 60 PH 1
Voltage Utilization Range: 104-126 VAC
Minimum Circuit Ampacity: 1 AMPS
Maximum Fuse or Circuit Breaker: 15 Amps
Blower Motor #1: 0.6 FLA 0.03 HP

I'm currently renovating my condo so I think now would be the best time to do the wiring. What do you suggest?