View Full Version : Cambridge Heater
12-14-2005, 06:56 PM
I was working on a Cambridge gas heater today for the first time today. What was happening is the unit would come on full fire and I would get about 5.5" at the burners. Then about 1 min. later it drop to about 2.5" and blow cold air. The burners never dropped out,then it would go back to full fire, and it would just repeat the cycle. This was the first time I worked on one of these units and I am not to sure what the problem is. I am thinking one of the asco solenoid valves is bad. The model of the unit is CH115AGA 800,000 btu in. Also if anyone knows any sites I can look up parts for these units, I looked for an hour and couldnt find any.
12-14-2005, 09:31 PM
Does unit have Modulating gas valve? If so you may want to check your Amplifier. The MV responds to a 4 to 24 volt DC signal from the Amplifier to modulate flow of gas to burner and also serves as the pressure regulator. Does unit have adjustment for low fire? From what you have posted My Advice would be to check Discharge air sensor, this sends signal back to amplifier and then modulates gas valve. also check and tighten wiring connections and grounds. Hope I helped!
12-14-2005, 10:33 PM
its been a while since I worked on one of those units, here a tech supp. # 1800-473-4569 ext.3312 ask for Kevin, I dont know if he is still there, good luck
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