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Phil
Phil, Mechanical Engineer
Category: HVAC
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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: 6 months ago.
Category: HVAC
Expert:  WCohn replied 6 months ago.

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

Expert:  WCohn replied 6 months ago.

Are they getting normal operation out of the other one?

Customer: replied 6 months ago.
other one works fine.
Expert:  WCohn replied 6 months ago.

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

Customer: replied 6 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 6 months ago.

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

Customer: replied 6 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 6 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 6 months ago.
What is lite color indication means?
Expert:  WCohn replied 6 months ago.

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

Expert:  WCohn replied 6 months ago.

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

Customer: replied 6 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 6 months ago.

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

Customer: replied 6 months ago.
we ll be in touch.
Expert:  WCohn replied 6 months ago.

Good Luck!

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