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12-31-2006, 08:39 AM
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#1
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Member
Trade:
remodeler
Join Date: Jun 2006
Location: Maryland
Posts: 40
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Recommendation on Single pole double throw (SPDT) thermostats
I need SPDT thermostats for ceiling radiant heat in 40-year old home. They do not have to be programmable or digital. So far the only one I can find is a Honeywell T651A, which is not acceptable to the home owner.
Does anyone know of any others?
Thanks Robert
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12-31-2006, 03:12 PM
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#2
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Old and Tired
Trade:
Remodeling and home services
Join Date: Aug 2006
Location: Springfield Mo
Posts: 13
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If you google ¨line voltage thermostat¨ you will find links to several good ones.Honeywell, White-Rodgers, and Lux Etc.
__________________
Those who cannot remember the past are condemned to repeat it.
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12-31-2006, 03:16 PM
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#3
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DGR,IABD
Trade:
Electrical; Commercial and Residential Service
Join Date: Mar 2005
Location: Central PA
Posts: 9,665
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Quote:
Originally Posted by mtplus
I need SPDT thermostats for ceiling radiant heat in 40-year old home.
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Oh no you don't.
Single pole, double throw? No way, brother.
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01-01-2007, 06:35 AM
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#4
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Member
Trade:
remodeler
Join Date: Jun 2006
Location: Maryland
Posts: 40
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single pole double throw thermostat
Quote:
Originally Posted by mdshunk
Oh no you don't.
Single pole, double throw? No way, brother.
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mdshunk,
The Honeywell T651a has the following specs:
Specifications:- Application: heating and cooling
- Temperature Range: (F) 44 F to 86 F
- Switching Action: SPDT breaks heating and initiates cooling on temperature rise
Notice the 'Switching Action' is SPDT. This is the only one that I have found so far but it is not aesthetically pleasing to the home owner.
Thanks for the feedback!
Happy New YEar!
Robert
Last edited by mtplus; 01-01-2007 at 06:39 AM.
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01-01-2007, 06:38 AM
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#5
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Member
Trade:
remodeler
Join Date: Jun 2006
Location: Maryland
Posts: 40
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Single pole double throw thermo
Doc,
Thanks for the reply. I have googled every known combo of line voltage thermos with no luck. I have already visited the web sites that you suggested including Federal Pacific and Hunter. No luck. These original thermostats are Federal Pacific.
happy New Year!!
Robert
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01-01-2007, 08:56 AM
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#6
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DGR,IABD
Trade:
Electrical; Commercial and Residential Service
Join Date: Mar 2005
Location: Central PA
Posts: 9,665
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Quote:
Originally Posted by mtplus
Notice the 'Switching Action' is SPDT.
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Yes, but why do you need an SPDT thermostat for heating? I offer that you DO NOT! That thermostat is certainly SPDT, buy why in the world choose a double throw thermostat for heating????
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01-01-2007, 12:52 PM
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#7
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Member
Trade:
remodeler
Join Date: Jun 2006
Location: Maryland
Posts: 40
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single pole double throw
mdshunk,
Perhaps I have my terminology wrong. The radiant heat has 2 hots - inputs (110v). When I turn the thermo from off to on (40 degrees), neither input is connected to the radiant heat. When I turn the thermostat up, it will click when I hit room temperature and 1 of the inputs will be connected to the radiant heat. If I continue to turn up the thermo, it clicks again and connects the other 110. If I have defined the problem incorrectly, I would appreciate it if you could set me straight.
Thanks and Happy new year!!
Robert
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01-06-2007, 08:33 PM
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#8
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Registered User
Trade:
HVAC
Join Date: Dec 2006
Posts: 1
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Thermostat
It sounds like you need a two stage heating thermostat. Is your existing thermostat line voltage or low voltage?
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01-07-2007, 06:49 AM
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#9
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Member
Trade:
remodeler
Join Date: Jun 2006
Location: Maryland
Posts: 40
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single throw double pole thermostat
Quote:
Originally Posted by SWCASH
It sounds like you need a two stage heating thermostat. Is your existing thermostat line voltage or low voltage?
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Swcash,
Current thermo is line voltage, 220 volt (2 by 110) for ceiling raidant heat.
Regards,
Robert
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01-07-2007, 10:34 AM
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#10
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New Guy
Trade:
hvacr & building contractor
Join Date: Jan 2007
Location: michigan
Posts: 15
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Does this unit heat up when 110 v is applied or only when 220 v is applied?If there is no heat untill 220v is applied then you will need a 220v stat.
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01-07-2007, 12:23 PM
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#11
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Member
Trade:
remodeler
Join Date: Jun 2006
Location: Maryland
Posts: 40
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single pole double throw
Quote:
Originally Posted by trollmaster
Does this unit heat up when 110 v is applied or only when 220 v is applied?If there is no heat untill 220v is applied then you will need a 220v stat.
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Trollmaster,
The radiant heat has 2 hots - inputs (110v). When I turn the thermo from off to on (40 degrees), neither input is connected to the radiant heat. When I turn the thermostat up, it will click when I hit room temperature and 1 of the inputs (110 volts) will be connected to the radiant heat. If I continue to turn up the thermo, it clicks again and connects the other 110 volts.
Regards,
Robert
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01-07-2007, 01:00 PM
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#12
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New Guy
Trade:
hvacr & building contractor
Join Date: Jan 2007
Location: michigan
Posts: 15
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When you have 110v on your first click does the tile start to heat up or will it only heat up when you have 220v applied
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01-07-2007, 03:40 PM
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#13
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Member
Trade:
remodeler
Join Date: Jun 2006
Location: Maryland
Posts: 40
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single throw double pole
Quote:
Originally Posted by trollmaster
When you have 110v on your first click does the tile start to heat up or will it only heat up when you have 220v applied
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The radiant heat begins heating with the first 110volt.
Robert
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01-07-2007, 09:23 PM
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#14
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Thoroughbred Mopar Man
Trade:
Railroad Conductor/ Ex Hvac Service manager
Join Date: Jan 2007
Location: South/East, Ks
Posts: 57
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Hi mtplus
I believe that mdshunk was trying to relay that for 240 volt resistance heat you only need a SPST thermostat, a SPDT is typically used for heat / cool application. I am assuming that would be to code in your area. In this case one line goes directly to the element and the other runs through the stat. As far as a thermostat either way, the best priced place to get one is a Johnstone supply. If you have one in your area that would be the easiest place to see several types. I know they have the White Rogers version, thats the one I keep in the heat only and the heat / cool version. Couldn't tell you the exact part number or cost, I am not at work right now.
Good luck
Rusty
Last edited by #CARRIERMAN; 01-07-2007 at 11:28 PM.
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