cantbreak80
Maybe I need new clubs
The Raypak water heating boiler maintains 110*F 24/7/365. The facility enjoys no significant business during the night time hours. And, during inclement weather…bleh.
So, I installed a PLR that turns off the boiler circulator whenever all bays are idle for more than 10 minutes.
The boiler features a flow switch that provides 24v hot to the Honeywell ignition module. So, when the circulator is off: no flow = no 24v hot to the ignition module.
The ignition module is 100% shutdown, meaning it must be manually reset (cycle power to the boiler) if no pilot flame is sensed during a call for heat. (IIRC, the module tries 5 times before shutdown occurs)
Well, don’t you know, the first time the OFF cycle exceeded 10 hours, the storage tank water cooled below the tankstat’s set-point. When the first timed-output of the day turned the boiler circulator on, the flow switch closed, the ignition module became energized, and the CFH signal SHOULD have allowed the boiler to fire. It didn’t.
Instead, a manual reset was required. “Huh?”
This process repeated the next morning.
My solution was to power down the circulator AND the boiler (yeah, they’re on separate circuits). But, I’m puzzled as to how the de-energized ignition module would go into shutdown.
So, I installed a PLR that turns off the boiler circulator whenever all bays are idle for more than 10 minutes.
The boiler features a flow switch that provides 24v hot to the Honeywell ignition module. So, when the circulator is off: no flow = no 24v hot to the ignition module.
The ignition module is 100% shutdown, meaning it must be manually reset (cycle power to the boiler) if no pilot flame is sensed during a call for heat. (IIRC, the module tries 5 times before shutdown occurs)
Well, don’t you know, the first time the OFF cycle exceeded 10 hours, the storage tank water cooled below the tankstat’s set-point. When the first timed-output of the day turned the boiler circulator on, the flow switch closed, the ignition module became energized, and the CFH signal SHOULD have allowed the boiler to fire. It didn’t.
Instead, a manual reset was required. “Huh?”
This process repeated the next morning.
My solution was to power down the circulator AND the boiler (yeah, they’re on separate circuits). But, I’m puzzled as to how the de-energized ignition module would go into shutdown.
