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Picked up the Honeywell T9 through my utility. It came along with the C wire adapter kit. What would be the cleanest way to add it to my Steam boiler. Attached is the transformer in the boiler itself. There's also an external transformer which power the old stat.
Which transformer is the t-stat wired to?"If you can't explain it simply, you don't understand it well enough"
It's wired to a transformer that was installed external of the boiler on the ceiling0
If there's a separate transformer for a thermostat, then there must also be an isolation relay. Does the existing thermostat use the Common?0
I don't think there's an isolation relay....thermostat was getting about 37 volts.0
What boiler is this?
Do you have the wiring schematic?
Can you pull a new wire from the boiler to the thermostat?Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment0
Why does a steamer need a T9?steve0
I have a tekmar 564. I did run a new Stat wire to the upstairs since I gutted the floor. The stat with remote sensor was like $50 from the utility. I want a wifi stat with remote sensor since the first floor is a tenant space.0
I would junction onto the yellow wire from the transformer in that there junction box.
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hourTwo btu/ per sq ft for degree difference for a slab0
37 volts. You might need boots on the ground for that. Unless you can draw out exactly where every low volt wire is going.0
That's why I was looking for advice. Seeing if the other transformer is necessary. Tracing out the wires Shouldn't be too bad....
Thanks for the comments0
Can you elaborate? Why would a thermostat see such high voltage from a dedicated 24-volt transformer?HVACNUT said:
37 volts. You might need boots on the ground for that. Unless you can draw out exactly where every low volt wire is going.8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hourTwo btu/ per sq ft for degree difference for a slab0
The way its wired, its picking up from both transformers. I'll check it out when I get home later0
37 volts. You might need boots on the ground for that. Unless you can draw out exactly where every low volt wire is going.Can you elaborate? Why would a thermostat see such high voltage from a dedicated 24-volt transformer?1
Good day, Mike Breault from tekmar here, if you only have 2 wires, there are a couple options, depending Ion access, if you're ok with the stat in the room, a tekmar 564 only needs 2 wires, and has isolatable switches for heat call. if you do not want access to stat, use the 2 wires for a remote sensor like a tekmar 084 with a 518 (non wifi) or a 561 (wifi capable) thermostat.
with either system you can use the boiler transformer, or a seperate one as the heat relay on all stats can be isolated for applications where there are 2 power supplies.
I think the schematic is similar to Alan's. Can't read it too clearly....
R & C on the stat are fed from the external transformer getting 27 volts
RH1 on the stat is going to BLUE on the transformer
W1 is going to BROWN
As I mentioned before, a new Stat wire has been run, so the 2 wires are not a problem. I'd like to clean it up a bit if possible.
@Timmmy if the Mech interface module is powered from a seperate transformer, move the J3 jumper pin to OFF. otherwise your boostiong your transformers.. the R and Rh1 are internally connected with J3 in the ON position.
Mike Breault, tekmar0
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