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Installing new furnace with two zones

Installed furnace with two zones, main floor with stat with 24 volt acuator/baffel in air supply and bed room down stairs with stat with 24 volt acuator/baffel in air supply. how do i wire the stats to control the heat and air cond. and also control the acuators

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You will need a control to operate motorized zone dampers. In the ductwork, you will install a damper in each line going into the area you want zoned. If you have air conditioning you will also require a barometric relief damper that allows air to pass thru the ductwork and not restrict air over your A/C coil. Common controls are made by Honeywell and EWC.

If you already have the control module, you will run two or three (low voltage) wires from each motorized damper back to the control. Your thermostat wires (also low voltage) will run from each thermostat to the control module and connect to a zone relay. Match each zone by number. You will need to run power to the control module that will provide power to the thermostats as well as the motorized damper. Check on the reverse side of the control module and/or check on the web to find the wiring diagram.

Posted on Nov 21, 2008

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Posted on Jan 02, 2017

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Could a limiter circuit interupt the transformer from getting 24 volts to open the furnace valve?


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If your pilot light is lit then I would first check your thermostat. Make sure it is on heat setting and fan is on auto, turn stat up to where it should be calling for heat. If you don't get burner to light remove front cover from thermostat and see if it has a mercury switch, if it does move temperature selector up and down and see if you can see a spark in mercury switch vial. If y ou cannot see a spark remove screws that attach t-stat to base.Remove carefully and disconnect wires that go to r and w terminals on stat base. Temporarily connect these two wires together. This should make burner light if you have power to thermostat. If burner does light disconnect wires and replace thermostat. Also if you have a volt meter check across these two wires and see if you have power there. Should be around 24 volts a.c. If your thermostat has a fan on setting try that. If fan runs you know you have power to furnace The gas valve needs 24 volts to operate and inside the electric control box in furnace there is a transformer to step down 110-120 supply voltage to 24 volts. If transformer is working you should be able to hear a low buzz or humming sound. You can also check across gas valve terminals when t-stat is set for heat, you should read about 24 volts. If you have 24 volts to gas valve and it is not opening then you need to replace gas valve. The main purpose of the limit switches is to turn blower on when temperature in heat exchanger reaches fan on temp,shut off blower after burner shuts off and heat in heat exchanger reaches fan off temperature, and limit if temperature exceedes set point without blower coming on. I hope this helps you. Thanks

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HELP!! New install of GMUH75-E3A - Main blower starts immediately on power up/ thermostat turn on. Burner never turns on/ignites. AC power is wired correctly and gas supply is connected. Switch is in the...


You need to find out if the problem is in the T-stat, T-stat wire or in the furnace you can do this in a few easy steps

 

Step 1- Unwire the low voltage from the furnace. Then turn the power back on and see if the blower comes on if it does then the problem is in the furnace and you will need to troubleshoot the furnace (see bottom of page for troubleshooting furnace) if it does not then proceed to step 2

 

Step 2- Wire the low voltage back up to the furnace (follow the wiring diagram below). And unwire the T-stat, make sure that no wires are touching each other, then turn the power back on to the furnace, if the blower starts then you have a short in the T-stat wire and you will need to pull a new wire. If it does not then proceed to step 3

 

Step 3- Turn the power back off at the furnace and wire the T-stat back up (follow the wiring diagram below). Turn the T-stat to auto heat 90 if the heat does not start but the blower just runs then you need to replace the T-stat.

 

 

troubleshooting furnace

 

http://www.hvac-for-beginners.com/furnace-troubleshooting.html

 

 

wiring diagram

 

 

 

 

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