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by jmf1
Wed Dec 19, 2007 8:34 am
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Upgrading controls
Replies: 7
Views: 3389

Htg engineer, thanks for your reply, but I think you misunderstood my question, I am familiar with the operation of TRVs at room level. I wanted the system to operate at different temperatures during the 24 hours, and not be constrained to the one temperature set at the thermostat. The CM907 will do...
by jmf1
Tue Dec 18, 2007 2:57 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Upgrading controls
Replies: 7
Views: 3389

Thanks guys, I have gone ahead an installed a honeywell CM907. However, I am already getting problems with temperature control. Can anyone with a CM907 explain, in simple terms, the operation of the time periods? Honeywell tell me that periods 1,3, & 5 are period starts and 2,4 & 6 are perio...
by jmf1
Mon Dec 17, 2007 11:06 am
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Upgrading controls
Replies: 7
Views: 3389

Upgrading controls

My CH system was installed about 28 years ago. I had the boiler replaced about 8 years ago, and have annual services carried out. I have had TRVs fitted to most radiators. The system is controlled by a rotary timer with two "on" and two "off" push-in settings. There are two rocke...
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