Control Wiring Geniuses?

kevin_5

My customer has two zones of in-floor radiant with a Peerless Pinnacle and single temp Promix running an indirect water heater.
AC is controlled by a Trane XT300C stat.
Somebody was messing with the stats (this is in his shop) and he had the clash of the titans. The AC was trying to cool things down, and the Radiant was trying to warm things up. Now he wonders if their is a way to make the Wirsbo heat only stats slave to the Trane stat. I told him I would go to the guys who know. Thanks for your help. Kevin

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Paul Rohrs_2

Get yerself some bailin' wire, duct tape, and a bottl' a pepto.

Then call your local wholesaler, I am hearin he is one of them thar genusss'.

regards,

PR

don_41

Split

subbase tstat,I 'm pretty sure trane has one.

Paul Rohrs_2

yup, thats even better advise.

Thanks Don

Regards,

PR

don_36

I'm sorry

I see where you have one ac and two stat for Infloor.

You can add a relay to the zone panel run the red from each
tstat at the zone panel thru a normally close set of contact.Then energize the relay from the first stage of cooling from the trane tstat.

Mike T., Swampeast MO

Here's a simple way

Needed:

1) DPDT toggle switch

2) Suitable mounting panel/box for above

3) Two conductor wire run between the thermostats

Hookup:

1) Determine which t-stat location should have the switch. If you want it somewhere else, you'll have to run a two-conductor wire from each t-stat to the switch.

2) Disconnect power lead to cooling thermostat and connect to one of the common (center) posts--through your new wire(s) if necessary.

3) Connect wire from closed contact (with switch in the position you want for cooling) to the cooling thermostat--through your new wire(s) if necessary.

4) Disconnnect power lead to heating thermostat and connect to the other common (center) posts--through your new wire(s) if necessary.

5) Connect wire from closed contact to the diagonally opposite connection used in 3) above.

SHOULD HAVE READ MORE CLOSELY--You have two heat zone stats! As long as they have a common source of power from the boiler, just connect a lead to BOTH t-stats from the switched terminal on the DPDT switch.

Note: if one or either t-stat require constant power there's usually a jumper that you can remove. You'll keep a connection to the hot terminal required for the t-stat itself and connect the power from your new switch to the terminal for "system" power.

If you want to be able to switch over from both locations, it gets a lot more complicated. Without resorting to electronics you'd need two momentary switches, four indicator lights, a DPDT bi-stable impulse relay (not easy to find by the way), another transformer (to keep from having ground problems between the power supplies in the separate pieces of equipment) and a two more SP relays to provide power to the stats from their respective units.

jerry scharf

maybe just a relay

Kevin,

What if you wired the cooling tstat 24VAC through a relay coil, then ran the heat tstat on the common and NC contacts? When the call for cooling closed the 24VAC contacts in the tstat, it would power the coil and prevent the heat tstat from operating. The only trick is whether the 24VAC from the Trane have enough VA to power the small coil as well as it's internal needs.

jerry

Josh M.

Toss in a DPDT relay that is activated by the ac and in turn de-activates the heat.

Floyd_5

I second Josh and Jerry....

Actually it could work with a SPDT relay and break the 24V power that fires the boiler.
Elec. is so cool!!!! Once you get the hang of it and how relays work you can amaze yourself everyday doing another neat trick!!!!!
BTW there are alot of sparky's out there that can't begin to wire an HVAC system.

Floyd

Scott25

Just had this problem

We added a spdt relay that "killed" the power to the radiant when the ac was calling. We added this relay in the mechanical room and it wasnt that hard. Some electricians do "get it" :-)

Scott