CS 82 Powerpile

Tom H.

I am a homeowner. I have a Waterbury gas furnace, model no. 6413C-10, prod. no. 10-57. It has a Honeywell Combination Furnace Controller, Type L498B and Auto Main Gas Control Valve VS87A9X4X2, 1/2SM, and a Thermac #300 Main Gas Valve, #2Pilot Valve and TII- Regulator. The controller is set at 200/110/100 deg. F. A couple years ago the furnace would not start and the technician cleaned the pilot gas tube and orifice, checked other things, and supposedly replaced the obsolete CS 82 Powerpile even though it was putting out 660Mv. After the repair the "new" Powerpile was putting out 672Mv. The Powerpile is now putting out 633Mv. Since the CS 82 does not appear to be available anymore, can some one provide me with the information on converting to a contemporary pilot generator assembly, and any other useful suggestions for this system also. I am asking this question separately on the Wall even though I see some discussion elsewhere. Thanks much.

Dale

Convert

If you plan on keeping the system why not just convert everything to 24 volts? This would be cheaper in the not too long run. If you want to keep the PP system you need to find someone who understands them and can properly test them. The key measurement is how much MV is available at the valve coil, with the stat closed on a call for heat, this should be at least 135MV. More modern valves like the Robertshaw vh700 only need 100MV. Since your open circuit output sounds OK I would look for a too large voltage drop first in the stat circuit then the safeties. Old timers solders all splices and made sure the stat wire was at least 18 gauge and as short as possible. If you valve has a vent line make sure it's open.

Unknown

Is the equipment still

running? Are you having a problem? How are you measuring the 633 millivolts? It should be done with the generator disconnected from the gas valve to get a true generator output reading. If you are taking the reading across red and white generator terminals instead of disconnecting it will affect your reading.

The minimum millivolts for your system generator is 540 millivolts. The 633 is still good. It might be that the pilot needs cleaned. If the former tech replaced the CS82 with a different pilot he is probably using a Q313 (rated to give 750 millivolts) generator which is still available. Have the pilot cleaned and put a new generator in if you want. If it is running leave it alone.

If you have any questions you can call meat 401-437-0557. I have over 40 years experience in the gas industry.