Hey y'all,
ADP 60k BTU LP Greenhouse heater. Rollout switch trips intermittently, but fairly frequently.
Issue started with mud daubers (GA wasps) having built mud nests in the heater. Found the issue. Cleaned the mud out.
Heater started back up, but eventually tripped the upper rollout switch again. All flames are blue and good.
One issue found is that a candle sized flame continues from the bottom orifice after there is no more call for gas. It continues for about a minute.
Assumed heater's automatic valve was not closing well. Replaced with new one (LP). Problem remained. Replaced the circuit board. Problem remained. Replaced the transformer. No improvement.
The unit has a regulator at the tank and one at the greenhouse wall. Tech support for the heater and the service manager at my gas co had no idea. Figured some of y'all might. Doesn't make sense to me. There is no gas leak when the heater is not in use. How do i fix this thing so I don't lose all my crops?
Have you seen when the roll-out trips? Does it happen because onw burner keeps burning at the orifice?
Usually a prpblem with the heat exchanger or vent could cause this problem but sometimes it's just a weak roll-out switch. Has it been replaced? Is the unit vented or un-vented? Does the unit have a good air supply?
Also did they check the gas pressure?
thanks for the reply.
I only actually saw it trip once. The heater had been on for 10 minutes and it went off when the rollout tripped. I saw no yellow flames, or any other obvious reason that it would have tripped and in that scenario, there was no candle sized yellow flame at the lower orifice. Everything went out completely.
I haven't replaced the rollout switch.
The unit is vented and has good air supply.
I haven't checked the gas pressure. I can hopefully get someone out here on tuesday to do that, but was seeing if there was anything I could do prior to that.
He changed the gas valve though. One would assume that the new valve is either calibrated, or uncalibrated differently to what the original one was. Checking manifold pressure though, most definitely should've been done.