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honeywell parts

Jim_47 Member Posts: 244
Called to my church to resolve an issue with the parish hall. I was told it never worked correctly and that it is not working at all now.
Original Hot air heat by electric elements circa 1973.
Someone replaced the elect elements with a Hydro coil off a gas boiler. circa 1989.
Controls for Occupied and unOccupied are done by a mish mash of timers relays and Honeywell W7500 control parts.
circa unknown. Does anyone have info on the W7500 controls and the various boards for those boards in the 3 modules I have?
Got the boiler up and running but since the spill switches were removed and hanging away from the draft hood it was evident that there was a problem with the flue.
Once we turned the blower on the room developed a serious neg pressure and all products of combustion spilled into the mech room.
Boiler all runs fine with good draft prior to blower running.
determined the blower is from the old electric coil system and the hydro coil is reducing air flow from the HVAC return ducts. THe speed of the blower is not matched to the cfm of the reduced air flow.
we are looking inot VFD's for the blowers. We could really use the Honeywell information so we can get the system to power up in Auto mode.
The less fingers and the more automatic the better.


  • Empire_2
    Empire_2 Member Posts: 2,343

    Sounds like a new piece of equipment is in order. What is a CIRCA??? and are you talking about HW economizer actuator and it circuit boards? Also sounds like you need combustion air into the room.
  • Jim_47
    Jim_47 Member Posts: 244

    Circa is the latin word for about.
    The Honeywell controlers were used in the control of the entire system. They are not hooked in any way to the boiler or its temperature control. The boiler runs on its own, banging off of the high temp limit.
  • BillW@honeywell
    BillW@honeywell Member Posts: 1,099
    The W7500 series...

    is obsolete with no direct replacement, and parts are no longer avaialable. It was an early light commercial building management package, and has been replaced by the W7700 series controllers operated by LCBS software. These products are sold only by selected Honeywell Commercial Distributors, who will design the system for you using these components and software. Liscensing agreements may be required.
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