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Regards Teddy. Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable. Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy. Use +Merv 10 air filter.
Damper in dual zone system stuck closed. I have a dual zone system with a total of 3 dampers, 2 for the upstairs zone and 1 for the downstairs zone. I've noticed that when neither zone is calling for heat / cool that the dampers naturally go to the open position, I believe via a spring when the damper motor is not powered.
M847d1004 actuator open/close issue. My system has 3 zones. I don't remember the model but it's a quite big variable-rate Lennox system powering my 1st floor which is about 2900SQF. Recently, one of the zone doesn't work. The system turned on the zone but no air-flow. I know it is the M847D actuator because I have to manually move the arm before.
You will need to secure it in the open position so the furnace can't blow it shut. I suggest a pair of vice grips. With the damper locked open, that duct and registers will get heat when the 1st floor thermostat calls. If you turn off the 2nd floor t-stat, that furnace will only run when the first floor calls.
This is the default for the Honeywell ARD, but it means a zone damper will have voltage applied to it whenever the zone is "off", or the whole system is in standby. This seems backwards to me, at least for our situation, but I'm open to the idea there may be reasons the Normally Open (power closed, spring open) operation is.
Occasionally it does not cool the upstairs. It works fine downstairs. It blows cool air and everything. I have two thermostats one for each floor and one AC unit. I have two dampers. They both seem to be (from what I have researched) Normally Open Power Closed Dampers.
The dampers are at a place that are inaccessible due to their location behind the kneewall without cutting a hole in the wall (more on this later). For the record the A/C unit itself seems to work fine and blows cool air to the second level which is easily enough to keep the house cool at night and most of the day.
I saw when the upstairs thermostat was calling it opened only halfway like the pic above. 2.) This is first time since I bought the home last year September I saw this. So not sure if it ever fully opened. Only way to make it fully open is If I disconnect M1 and M6 wires or if I give a hard wiggle it opens fully.
Turn on the blower in the furnace. Take a tissue, napkin or paper towel and place it on that intake. If it holds, most likely it is open. If it won't stay, then most likely it is closed. That damper is not sealed, so some air came be drawn in, but you should find a distict difference between open and closed.
Try the following, since it is still the winter heating season: open top return grill dampers and close bottom return grill dampers on all sets like this throughout the home. Run it a few days like that and see if you're comfortable. Then switch positions on each set and run it like that for a few more days.