Lennox two zone single HVAC system zone pump problem 請教

來源: RomaVacation 於 2025-11-26 22:00:47 [] [舊帖] [給我悄悄話] 閱讀數 : (7395 bytes)
本帖於 2025-11-26 22:02:44 時間, 由普通用戶 RomaVacation 編輯

Cold weather now. Downstair not that warm air (air flow rate normal) 60 degree , upstairs (different zone) ok. Each zone has its thermostat. Changed battery at thermostat. Azrel 202 MPS2 system with pneumatic damper control ( I just learned today this control pressure tube could go 100 ft).

I looked up old record. This little air pump was replaced 8 years ago. It is the bottom white part in the large photo below.

My questions:

Are there 2 wires going to the solenoid for each of 2 zones? It looks like single damper for both upstairs and downstairs (2 zones).

Other than pumps, what other issues should I look for?

https://www.johnstonesupply.com/product-view?pID=L44-998

r/hvacadvice - Lennox two zone single HVAC system zone pump problem?
r/hvacadvice - Lennox two zone single HVAC system zone pump problem?

I can not read the model #.

r/hvacadvice - Lennox two zone single HVAC system zone pump problem?

Old broken one that was changed 8 years ago.

 
 
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