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Automatic Water Feeder shuts off power at low water? Plumber says it's the thermostat
Here's the situation. Hope you can help me. I have a:
-Honeywell YTHX9421R5010 Prestige IAQ Comfort System Kit (Includes Thermostat, EIM, Portable Comfort Control, Outdoor Sensor)
- Burnham SIN5LNC gas steam boiler
- McDonnell low water cut off 24 v.a.c switch PSE-802
We have a manual water feeder before, and everything was working fine. Note that when the boiler ran out of hot water, the water cut off switch would cut off power to the thermostat (not sure if that's normal, but it's part of the problem below).
Our plumber installed a VXT-24 automatic water feeder switch. The problem is that when the boiler runs out of water, the power gets cut off, including to the VXT which is connected to the McDonell, so the boiler doesn't get refilled.
Our plumber is convinced the Honeywell is the root cause of the problems (he hasn't seen this type of thermostat before), but I'm not so sure. Why can't the VXT get it's power from the transformer directly, instead of getting it from the McDonell cut off switch? Does it makes sense the thermostat gets it power cut off when the boiler runs out of water?
Right now we're at a standstill since the plumber doesn't want to deal with it until we install a normal thermostat.
FYI - EIM connectors used: R,C to thermostat, W1, R, C to boiler.
PSE-802 to VXT: N (white), H (Red).
Edit: I have done some more research. Shouldn't there be a 3rd, feed, cable from the PSE-802 to the VXT?