MA-ND4 Adjustment

[achipoletti]

I have a single family home with two zones that are controlled by two thermostats and three MA-ND4s.

I normally keep Zone 2 turned off (Upper level) - controlled by one thermostat and one MA-ND4.

Zone 1 contains 17 supply registers - I'll call them Zone 1A and Zone 1B...
One thermostat and two MA-ND4s.

Zone 1A is the main section of the house - which I can never seem to keep warm in the winter.
This is a large open area with a vaulted ceiling. Also two bedrooms, a laundry room and a bath.
Also controls registers in a finished basement.
This zone has 12 supply registers total - 9 main level / 3 basement.

Since Zone 1B only has 5 supply registers, I was wondering if adjusting the MA-ND4 that controls it to a minimum open setting would make any difference.

[Pcyrana]

Just to make sure I understand what you are asking here...
You would like to make the zone 1B area not open 100% in an effort to force more air to zone 1A when they are both calling?
If that is the case then you can definitely give that a try.
The position setting you will want to adjust will be the one with the "O" next to it.
If you have any questions regarding this please let me know.

[achipoletti]

Thanks Patrick...

I also need to make some adjustments to get rid of a whistling sound when only my loft system is activated.
I have a bypass damper installed that returns excess air to my return duct.

But my main dampers must have a gap between the damper and the duct - so I neeed to find a way to close the gap.