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fossil fuel systems
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10-06-2011, 06:39 AM
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#1 |
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Junior Member
Trade: hvac contractor
Join Date: Oct 2011
Posts: 1
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fossil fuel systems
air to air heat pump and lp furnace back up ---i only want the lp to come on if it gets real cold out and if the heat pump wont keep up --what is the best way to do this ?
 thank you
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10-08-2011, 12:33 AM
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#2 |
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Junior Member
Trade: Chill water air handlers, geothermal, Carrier Infinity
Join Date: Oct 2011
Location: Houston area
Posts: 8
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Re: fossil fuel systems
The Honeywell TH8321 with the optional outdoor sensor can do this.
  The section above the highlighted area would apply...  The section above the highlighted area would apply... |
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10-09-2011, 07:21 AM
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#3 |
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Senior Member
Trade: Service/Installation
Join Date: May 2009
Posts: 600
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Re: fossil fuel systems
The IAQ (YTH9421) is better for dual fuel systems.
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10-10-2011, 09:29 PM
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#4 |
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Junior Member
Trade: Chill water air handlers, geothermal, Carrier Infinity
Join Date: Oct 2011
Location: Houston area
Posts: 8
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Re: fossil fuel systems |
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10-12-2011, 08:47 AM
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#5 |
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Senior Member
Trade: Heating & Air Conditioning
Join Date: Sep 2011
Posts: 101
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Re: fossil fuel systems
Well between IAQ (YTH9421) and TH8000 series which is better?
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10-12-2011, 05:01 PM
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#6 |
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Senior Member
Trade: Service/Installation
Join Date: May 2009
Posts: 600
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Re: fossil fuel systems
The IAQ. And since the EIM is mounted/installed at the furnace, you don't hear any clicks at the thermostat like you would with the 8000 series.
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How many times must one fix something before it is fixed? |
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11-14-2011, 08:18 PM
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#7 |
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Junior Member
Trade: hvac contractor
Join Date: Apr 2011
Posts: 16
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Re: fossil fuel systems
aprilaire has a stat that can also do this without an outside sensor.
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