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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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Changing a room thermostat
Hi,
My old Honeywell room thermostat needs changing. I bought a Horstmann HRT2. The old wiring was twin and earth style with the earth cut off (not used) and just the live and neutral cables being wired in. The instructions for the new thermostat indicates that 3 wires are needed: L - Common supply, Load - Call for Heat, N - Neutral. Can I use the existing wiring and just omit one of the connections ? If so, which one ? Cheers.... |
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Quote:
For most heating control systems you only need a contact which is made on call for heat. Establish which pin does this by placing a contiunuity tester on the common, and turning the dial up until you hear it click so as to call for heat. See which other terminal is "made". Double check by turning it down to see that the contact becomes broken. |
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On Tue, 28 Dec 2004 13:33:32 +0000, Ali
strung together this: Hi, My old Honeywell room thermostat needs changing. I bought a Horstmann HRT2. The old wiring was twin and earth style with the earth cut off (not used) and just the live and neutral cables being wired in. The instructions for the new thermostat indicates that 3 wires are needed: L - Common supply, Load - Call for Heat, N - Neutral. Can I use the existing wiring and just omit one of the connections ? If so, which one ? The old wiring is live and call, not live and neutral. Connect up the live to the common suppy and the call to call. You can omit the neutral connection, it helps to keep the temperature more regulated, basically. I would recommend you use a programmable room stat as these are more accurate and will work with only the two wires that you have. -- SJW Please reply to group or use 'usenet' in email subject |
#4
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The instructions for the new thermostat indicates that 3 wires
are needed: L - Common supply, Load - Call for Heat, N - Neutral. The thermostat you have chosen is an old mechanical bimetallic type, whilst your system is wired for a modern type. Although you can get it to work by omitting the neutral, it will operate very poorly. Send it back and buy a 2 wire electronic type, preferably programmable. Christian. |
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