The Orchid Forum, for the UK and Europe (previously known as The UK Orchid Forum) • View topic - heater thermostat
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 Post subject: heater thermostat
PostPosted: Tue Aug 30, 2016 6:41 pm 
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hi all.
had a problem today with my peco thermostat which I fitted a few weeks ago to my parwin heater,went into the greenhouse this afternoon and the heater was running but the temp in the greenhouse was 100 degrees already and the thermostat is set at 64 degrees. can any body give me a reason why this would happen.
thankyou.
Robert.


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 Post subject: Re: heater thermostat
PostPosted: Tue Aug 30, 2016 9:07 pm 
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The contacts inside the thermostat that respond to temperature change have fused in the on position . This has happened to me a couple of times over the years, usually the first sign is the roof autovents open at night! Buy a new thermostat, easy enough to fit on a Parwin heater. If you only bought the thermostat recently you should be able to get your money back.


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 Post subject: Re: heater thermostat
PostPosted: Tue Aug 30, 2016 9:29 pm 
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hi.
I repaced the heater with another one,but when I brought the faulty one back indoors it worked well again.
rob.


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 Post subject: Re: heater thermostat
PostPosted: Tue Aug 30, 2016 9:42 pm 
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I would suggest you buy a quality thermostat which might cost you £60+. It might seem expensive but you will get your money back in one year with heat savings.
Brian


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 Post subject: Re: heater thermostat
PostPosted: Tue Aug 30, 2016 10:39 pm 
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hi.
been using these peco for a few years now and this is the first time I have had problems.can you tell me a good thermostat to use for future reference.
thanks.
rob.


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 Post subject: Re: heater thermostat
PostPosted: Tue Aug 30, 2016 11:14 pm 
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At first thought I would say;
1. Is the thermostat weird correctly?
2. Is it getting cold air some how, causing it to bring on the heat.
3. Make sure it is not being blocked from sensing the green house temperature.
4. There are many digital thermostats that you must inter the program and select the correct number for what kind of heat system you are using, Gas, electric, hot water, Oil, heat pump, ect.
5. If you use a mercury bulb thermostat, you must make sure it is level, or it will never work properly.
6. Is your thermostat compatible with you heating system? The common terminals can be quite confusing X,C,B.

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 Post subject: Re: heater thermostat
PostPosted: Wed Aug 31, 2016 7:09 am 
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hi.
yes the wireing is ok,i have 2 parwin heaters in the greenhouse both fitted with peco thermostats which I have fitted the other heater has had the same thermostat for 3 years and no problems.
rob.


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 Post subject: Re: heater thermostat
PostPosted: Fri Sep 02, 2016 10:47 pm 
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If you are using thermostat wire check it for a short by ohming it. Some t-wire the rubber on the wire can split inside and short together. Or mice, rats, cats, squirrels like to chew on the wire and can cause shorts. If the wire is ok then check the heat relay/contactor they can stick and keep the heat on.

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Director Orchid Conservatory and Research Center, China.

View us at ocrcchina.com


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