Thermostat choices with Taco SR502

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Old 01-26-08, 05:18 PM
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Thermostat choices with Taco SR502

This is a last piece in my puzzle.

2 zones:
- high temp underfloor
- low temp slab

1 primary pump, 2 secondary pumps (one with I-series setpoint mixing valve), Trinity Ti100 w/ Sentry 2100 control, Taco SR502 switching relay).

There already is one thermostat in a slab zone (it does central air heating and cooling). I am not sure if there is a thermostat that would do all in one (3 sources: central air HAC + radiant H) or I should just add on another dedicated heating only thermostat?

Second zone thermostat would do radiant only.

Any suggestions? Tekmar? Honeywell?
 
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Old 01-26-08, 07:44 PM
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Thermostat

Are you saying you have two sources of heat for this room with one being warm air(?) & the other low temp radiant?
 
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Old 01-26-08, 08:28 PM
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Originally Posted by Grady View Post
Are you saying you have two sources of heat for this room with one being warm air(?) & the other low temp radiant?
Basically, yeah.

First floor (slab) - has existing T-stat that does warm air and AC + additional wire for optional radiant T-stat

Second floor - wire for radiant T-stat

Option 1:
- Adding on a radiant-only T-stat on the first floor
- Radiant-only T-stat on the second floor

Option 2:
- Replacing existing T-stat with 2-stage H, 1-stage C new T-stat
- Radiant-only T-stat on the second floor

So far I found a Tekmar 545 and 541 (or 542) to work for option 2. Not sure if that's the right choice and if 545 would do both zone programming (and 541 would be enough for 2nd) or it would do just one zone programming (and I would need 542 for 2nd).

Is it possible to set it up that radiant will have priority and warm air will kick on only at ~50F (in case of boiler's failure)?

Would I need anything else besides Taco SR502, is this a good combo? Didn't check Honeywell yet.
 
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