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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have 4 zone hydro air/carrier air handlers / buderas oil

Customer Question

I have 4 zone hydro air/carrier air handlers / buderas oil fired boiler. Entire system just "serviced"
2 main problems were reason for servicing. Those problems still exist three days after service. Need help resolving issues.
(1) one zone will not operate with thermostat set for "auto" (digital non-programable new thermostat). Heat will function on and off using the thermostat on/off function only.
(2) second zone blows mildly warm air when it turns on, then cool room temp air ten minutes later. I can measure the other three zones at least 20 degrees warmer around 100-110 degrees at the floor registers for the ones which produce heat, 70 to 80 for the problem one.
Please advise.
Submitted: 1 year ago.
Category: HVAC
Expert:  Natech replied 1 year ago.

HI my name is***** will be happy to assist you today. May I have your first name?

Expert:  Natech replied 1 year ago.

I just clocked in and see that your question has not been picked up. Experts normally only take questions with equipment they excel in. First, I would like to point out that if you were charged $500 I would contact the company you hired and demand that they come out and fix the problem. If we can get resolution before they come out, I would ask for a refund. Please verify/provide information for the following questions:

1. What is the model # ***** your New Thermostat on problem zone 1

2. What type of zone valves do you have

3. Does the boiler seem to be functioning normally, you have hot supplys going to zone valves

4. If all other zones are off does problem zone 2 maintain warm air delivery?

Expert:  Natech replied 1 year ago.

It appears as though you are offline, I will be checking back frequently as I help other customers. Please leave this browser open as I will be checking in from time to time through the evening. Also, we do offer Additional services, if preferred, additional services allows us to exchange personal information and live phone consultation. Sometimes this is the better option for folks as more information can be exchanged quicker through resolution.

Customer: replied 1 year ago.
Hi, Natech,
Mary here.New thermostat is honewell worked for 3 days after tech left. We just replaced it todaywith honeywell improvement but worth a try.
zone valves say isolator uni-flange ball valve by webstone (all new piping with buderas install in 2010
boiler works fine, all pipes are hot, all 4 aquastats fine new in 2008, indirect hw fine new 2008
the one zone stays cool even when all other zones are thermometer test at floor register went from 90 to 70 degrees just now when turned on after 15 minutes.
air handlers are carrier year 1990 original to house with 4 outdoor ac's
Customer: replied 1 year ago.
testing some more....the one cool zone actually is still warm 30 minutes later when no other zones are running. temp around 86 degrees ...hope this is helpful
Expert:  Natech replied 1 year ago.

What controls each zone, a zone valve or are they pumped individually?

Expert:  Natech replied 1 year ago.

If they are individually pumped, what controls the pump, is there a zone control panel?

Expert:  Natech replied 1 year ago.

If temperature problem zone works ok without any other zones running then it sounds like a flow issue, i.e. not enough flow is going through air handler to maintain temp. With new thermostat did you install the batteries?

Expert:  Natech replied 1 year ago.

I definately have some ideas. We can also offer additional services which would include a phone consultation. Let me know if you are interested in that.

Customer: replied 1 year ago.
Nathan, I'll try to answer...
there are five TACO circulators piped from the buderas, above the circulators are the "isolator uni-flange ball valves".
there is a 6 zone control panel (one zone unused) "TACO sr506 switching relay" the indicator lights work properly
the cool zone dropped down again even when the other zones were off. It did maintain warm flow slightly longer when the other handlers were not on. The air flow is probably not great for that zone....largest zone in the house but only one return duct.
as to the thermostat first digital had new batteries....todays install doesn't need them
Customer: replied 1 year ago.
Nathan, just turned on two additional zones and no drop off for the cool zone.
Customer: replied 1 year ago.
Third visit from same company....different technician today.....replaced 2 aquastats which first tech twice said were ok.
6 weeks, three visits, finally fixed.
Expert:  Natech replied 1 year ago.

I am glad you got it handled. Sorry I couldn't be of more help but with the information of the tech saying the aquastats were ok of course had me going in the absolute wrong direction. Please consider Just answer in the future for help. Cheers, Natech