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Wiring to replace a Trol-A-Temp Mastertrol Mark V with Honeywell HZ322
Hi All,
I'm replacing my Trol-A-Temp Mastertrol Mark V with Honeywell HZ322. I have 3 questions.
1- Comp (Y) has 2 wires. Should I do the same in HZ322 and connect both wires to the Comp (Y)?
2- Nothing connected to RH. I do have heat, so I'm guessing it's connected somewhere else with RC. for my HZ322 connection. Should I keep it the same? Not to connect anything to RH on the board?
3- I do see 2 wires connected with a red cap (shown in the picture). Should I leave them the same when I connect it to HZ322?
Thank you all for you help!
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Comments
Also, in the picture you sent, the system is calling for heat, and zones 1 & 2 are open (wanting heat). Was that picture taken during the heating phase of your checkout?
If you have the DAT, I'd install it, It allows the system to temporarily stop the heat or cool call if the ΔT gets excessive. Plus it's neat to watch it on the screen.
Is the black thing in the middle is the limit switch? I don't see any model or number for it.
How do I check if the switch stuck? Thanks
Your description of the panel sounds like it's doing the right thing, but if the fan never ever shuts off then something's not right. Are you sure you didn't just catch it shortly after the burner shut off, when the limit switch would still have the fan on?
If it really does run continuously, start by unhooking the wire landed on the 'G' terminal in the furnace. If the blower stops (or doesn't start back up, you might have to put the door back on the furnace to get everything powered back up), start following the green wire back towards the zone panel. If the fan still runs, replace the limit. You should be able to get one with just the model & serial of the furnace.
Remove the green from G on the equipment side of the zone board. If the fan shuts off it's on the low volt side. If the fan stays on its likely the line volt side of the heating circuit is the culprit.
The black box is the fan/limit control. The fan contacts could be stuck closed. You should have an electrical meter to check where the circuit to the blower motor is closed.