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Short Cycle on Hot Water Zone off Steam Boiler
New gas fired steam boiler installed with a hot water zone off it. Steam heat seems to be working fine, but short cycling is occurring. Boiler fires for just over 1-minute, then shuts down for just over 3-minutes, then fires again and shuts off along similar intervals. Honeywell Aquastat L4006A set at 180 degrees with a differential set to what looks like 5 degrees. During the short cycling, I do not hear the Taco 007 circulator pump run, but the thermometer (Moeller Bimet) attached to the hot water loop deviates between 160 and 200 degrees. Watching that thermometer I observe the following:
@ 160 degrees the boiler fires up
@ 180 degrees the boiler turns off and the thermometer continues to rise to 202 degrees then begins to fall back.
When the temperature falls back to 160 degrees, the boiler fires back up and the cycle starts over.
During all of this short cycling, the radiators are generally cool, so it seems the short cycle is only occurring when the system is not calling for steam.
For reference, I see the following make/model and settings on the new equipment:
US Boiler Independence I6
Honeywell Pressuretrol (set to a Diff .5 kPa / 1PSI) and Main 10 kPa / 1 PSI)
Honeywell Aquastat L4006A
McDonnell & Miller Lower Water Cutoff for Steam Boilers PSE-802-24
Honeywell RA832A relay
VXT VXT-24 Programable Water Feed (showing 05 in the digital display)
Taco 007 Circulator Pump (on output circulating away from boiler)
Honeywell RTH2003B Programmable Thermostat (Hot Water Zone)
Honeywell Thermostat (Steam Zone)
The hot water zone / loop does not have a heat exchanger or compression tank.
Well, hopefully I have supplied enough information to start the conversation.
I'm a homeowner who's trying to study and learn their system (and its problems), so you may need to break it down in laymans terms for me. Will need to be able to relay the info correctly to the heating co to hopefully resolve the problem.
Was hoping not to have any issues right off the bat.