It's around time to fire up the furnace. However, our furnace is running on very short operating cycles. We hired some salesmen ^H^H^H^H^H repairmen to look at it, but they only want to sell us a new furnace. So, i am trying to understand how it works, and to adjust it. Might need to change some R & C. Perhaps adding a micro.
Operating cycle:
- Ignition at T+0
- Burner on at T+35
- Fan on at T+1:40
- Burner off at T+2:16
- Fan off at T+3:44
T1: 4. - 3. = 2:16 - 1:40 = 36 seconds T2: 5. - 4. = 3:44 - 2:16 = 88 seconds
Problem: The furance is browing cold air during T2. Would like to increase T1 and decrease T2 (even to 0).
Question: What kind of sensors are they, On/Off or thermocouple?
The IC is a CA3058 level detector.
The rest is at http://173.224.223.62/hvac
Thanks in advance.