NCM300 - Maximum URD and SID Dampers

[ajheat]

What is the maximum number of URD and/or SID dampers that can be connect to one zone of the NCM300 before you need to use an auxiliary relay with an additional transformer?

[Eric K.]

A maximum of 12 per zone and 25 total across all zones. The largest transformer you can use is a 24vac 60VA transformer.

Eric

[ajheat]

Wow. The NCM300 can actually handle enough current to control up to 12 URD or SID dampers on one zone. I have to assume then that the URD and SID dampers must have very low current drive motors.

I'll have 10 dampers on two zones for a total of 20 dampers in the system and I'll use a 24Vac 60AV transformer.

Thanks.