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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Have customer's ac system with two zones controller by "zone

Customer Question

Have customer's ac system with two zones controller by "zone a trol"
dumpers. One of dampers lite indicator shows red while t stat calling for cooling.
Damper is open but air coming out is warm as room temperature.
Submitted: 10 months ago.
Category: HVAC
Expert:  WCohn replied 10 months ago.

Hello, my name is ***** ***** I look forward to helping you!

Expert:  WCohn replied 10 months ago.

Are they getting normal operation out of the other one?

Customer: replied 10 months ago.
other one works fine.
Expert:  WCohn replied 10 months ago.

That damper is NOT switching over if it is just recirculating room air?

Customer: replied 10 months ago.
It installed on air trunk branch and moves close and open positions based on thermostat calling.
When it switched to green lite on ,temp. of air went down.
I saw shift spinning.
Expert:  WCohn replied 10 months ago.

If its working properly then why would it have room temp air in that branch?

Customer: replied 10 months ago.
I do not think its operation normal..... Both dampers controlled by single stat sending air to 2 different rooms.
One damper indicate green lite and its fine.Second is a problem keep of switching from green to red. When in red air is worm(room temperature.
Expert:  WCohn replied 10 months ago.

Right i think the motor on that damper is bad or the damper is stuck. its a small low voltage motor

Customer: replied 10 months ago.
What is lite color indication means?
Expert:  WCohn replied 10 months ago.

Red is closed green is open. if i understand you correctly its closing on its own?

Expert:  WCohn replied 10 months ago.

Somehow it is getting 24 volts to the close circuit when it shouldn't

Customer: replied 10 months ago.
Yeas it does. Also lite goes off completely.
At this point I am not sure if it is end device or controller itself.
The controller has I spare terminal block for 3rd damper,not used in this application. May be I can use this block for damper in question??
Expert:  WCohn replied 10 months ago.

That's a great idea. I'd try that in a sec if I were you

Customer: replied 10 months ago.
we ll be in touch.
Expert:  WCohn replied 10 months ago.

Good Luck!