Digital Thermostat To Control Exhaust Fan - HVAC - DIY Chatroom Home Improvement Forum

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Old 10-01-2010, 01:34 AM   #1
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Digital Thermostat to control exhaust fan

I've procured a digital thermostat that i'd like to use to activate a 240Vac ceiling exhaust fan at a given temperature.
The Manual for the Thermo states;
  • 3 high speed air blowers.
  • Motorised valve with electrically operated wind valve.
  • Cotrol ventilation, cooling, warming.
Tech. specs:
  • Supply voltage 220VAC+/- 10%
  • Relay electronic contact 3A 240VAC
  • Output 200W
...and the wiring diagram shows its 6 terminals labled; N, HI, MID, LOW, VALVE, L.

Now for my questions;
  • do the high, mid, low, fan settings correspond to different speeds for a single fan or to switching for 3 individual fans?
  • Could this thermostat be used to activate and vary the speed of a speed variable ceiling fan? (if so, how would it be wired to this unit?)
...sorry but i don't know how to include the actual wiring diagram in this thread. Perhaps the info I've given you guys might be enough, otherwise the actual diagram can be downloaded at

To anyone who might shed some light ... my thanks!


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