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Noma Programmable Digital Thermostat

Asked Sep 25, 2007, 09:18 PM — 8 Answers
I have Honeywell mercury tilt theromometers controlling the baseboard heating in my home. I want to be able to programme the heat to turn on and off as and when it is needed and I bought some Noma Programmable Digital Thermostats to replace them. The Honeywell thermostats work well but when I connect the Noma one nothing happens - no heat - no didgital display - nothing. It looks idiot proof, two wires coming out of the box in the wall, two wires to connect to the Thermostat - what am I doing wrong?

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hvac1000's Avatar
hvac1000 Posts: 14,063, Reputation: 2261
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#2

Sep 26, 2007, 09:31 PM


Is the Honeywell thermostat for 110/220 volts? Is the new thermost for 24 volts? This could be the problem
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acmckelvie's Avatar
acmckelvie Posts: 4, Reputation: 1
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#3

Sep 28, 2007, 08:11 AM
Quote:
Originally Posted by hvac1000
Is the Honeywell thermostat for 110/220 volts? Is the new thermost for 24 volts? This could be the problem

Thanks for your reply, that is exactly the problem. Any suggestions what digital thermostat would be compatible with my baseboard heaters?
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labman's Avatar
labman Posts: 10,673, Reputation: 3051
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#4

Sep 28, 2007, 08:35 AM
This could be a bit of a mess. If it is a 240 volt heater, you should use a double pole thermostat which requires 4 wires.
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hvac1000's Avatar
hvac1000 Posts: 14,063, Reputation: 2261
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#5

Sep 28, 2007, 09:35 AM


Code says you only need to break one side of the 220 volts to control the heater element but both sides have to be protected by a over current device. Fuse/breaker.
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acmckelvie's Avatar
acmckelvie Posts: 4, Reputation: 1
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#6

Sep 28, 2007, 09:46 AM
Quote:
Originally Posted by hvac1000
Code says you only need to break one side of the 220 volts to control the heater element but both sides have to be protected by a over current device. Fuse/breaker.
In non-technical speak for the technically challenged please...........
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cps124 Posts: 1, Reputation: 1
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#7

Sep 28, 2007, 02:57 PM
I'm having the exact same problem, but have central heating.
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hvac1000's Avatar
hvac1000 Posts: 14,063, Reputation: 2261
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#8

Sep 28, 2007, 04:12 PM


220 volts uses 2 wires for power. Each wire is 110 volts hanse when combined equal 220 volts. Code requires you only have to have a switch or thermostat that opens up one side of the 220 volts not both to control the heater.Now the disconnect/fuses or breaker has to be a two circuit type so all the voltage will be off when servicing.
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acmckelvie's Avatar
acmckelvie Posts: 4, Reputation: 1
New Member
  
#9

Sep 28, 2007, 04:33 PM
Quote:
Originally Posted by hvac1000
220 volts uses 2 wires for power. Each wire is 110 volts hanse when combined equal 220 volts. Code requires you only have to have a switch or thermostat that opens up one side of the 220 volts not both to control the heater.Now the disconnect/fuses or breaker has to be a two circuit type so all the voltage will be off when servicing.
Is it possible to do what I want to do - or should I abandon all hope of digitally time controlling my heating?
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