We have a schwank prefection wall furnace and the temp control is very touchy. We barely move it to get a higher or lower tem and the temp in the room changes too much. This unit does not have a thermostat. It is a knob control. Can we put in a thermostat to control the temp or do we need a conversion something to do that? I do have the book but it is unclear if a conversion kit is needed. The model ASV120 David
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The problem is more than likely in the flame rectification circuit. The little rod that senses the flame probably has barely perceptible corrosion on either its surface or on the physical wiring connections between it and the ignition control module. A little touch with the sandpaper at these connections should take care of it. I've had extreme cases where the actual furnace grounding conductor was creating the issue.
The rule of thumb for placing thermostats on the wall is to be far removed from any vents (warm or return air), it shouldn't be in a hallway where the air moves like a wind tunnel. It must be one the the most still areas in your home. Is this the case?
Dear Alex191: I am shocked and amazed that the Williams heater company is STILL knowingly and willingly selling faulty direct vent gas heaters. My problems took place in 1988! I bought a 30,000 BTU Williams DIRECT VENT from The Home Depot. I took the time to remove window sashes and run gas line to the Williams heater that I had placed in the window aperture. I was glad to finally have heat and be able to heat the area of the house where I stayed. Then I began to smell gas when the Williams was OFF. I traced it to the area where the pilot light gas tubing entered the combustion chamber. I removed the Williams unit and replaced it with an identical make and model and the SAME THING HAPPENED!!! I sat on my bed and almost cried. I had the gas company come out and they labled the problem as a "fuzz leak". The warranty repairman came out and had no idea what to do. Tightening the retaining nut did nothing. I called Williams and even back then they said that they were aware of the problem. They called me back and wanted to send me a part and asked me, "Can you work on it?" I returned the Williams and bought a Perfection-Schwank CONSOL heater that burns the air in the room and vents horizontally to a 4 inch vertical gas vent and was very satisfied with it. When they went out of business I bought an "Empire" brand gas heater. I don't know if I'll ever buy another direct vent heater from anyone. I will be glad to write an affidavit should you decide to suit the Williams company.
there have been several situations wht rheems as far as control boards cracked heat exchangers cracked inducer assemblys and touchy pressure switches i would call to get a furnace inspection from a rheem dealer
sounds like you really need to buy a portable dehumidifier