Questions tagged [zoned-heating]

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Should I convert two AC units to a dual-zoned unit?

One-story 2200 square ft home, currently with two AC units, need replacing, which is better two AC units or a dual zoned hvac system?
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1answer
30 views

Sun room hvac heating and air

I have a screened porch with one side brick and three walls screens. The ceiling is 1/2 inch plywood. The window guys from window world are coming out in a week or two to install windows and remove ...
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1answer
37 views

Run mini-split heat pump heads at different temperatures

I vaguely remember the contractor who did maintenance on our ductless heat pumps two summers ago telling us not to set the thermostats of the two small heads that share an outdoor unit to different ...
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23 views

Should I do away with the HVAC zone system entirely or spend the money to replace/update a non working system?

I know nothing about this but I have a two story 2000 sq. ft home built in 2006. The zone system failed. To update it will cost alot. To do away with the two zone system is much less. I'm not sure how ...
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1answer
30 views

Zoned Forced Air System Runs 2.5X Upstairs vs. Downstairs

I bought a house built in 2005, ~4100 sq. ft. Reasonably insulated to code, as required in Chicago, IL. I've got an upstairs thermostat and downstairs thermostat. Both are Nest thermostats ...
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1answer
30 views

Determining what zones are controlled by which thermostat

I purchased a quad plex. We live in the double unit on the first floor and have one thermostat which seems to call for heat in our zone. On the second floor there are 2 units with seperate thermostats ...
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1answer
44 views

Thermostat C wiring issue

I am having a two-wire system oil boiler with two-zone valves. I installed two Nest E and worked fine but it started to swing the valves due to the charging cycle. So I decided to run a new C wire ...
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1answer
197 views

c wire on a multi taco zone valve boiler

looking for assurance on what I think is the right setup to add a c wire to a current 2 wire zone setup. See pic of transformer junction box. Currently I have 3 zones using one transformer and 3 taco ...
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0answers
24 views

Zone valves and air purge

I have a 3 zone boiler system with baseboard heating. Zone 1 & 2 have nest thermostats, zone3 has a non-programable thermostat. Zone 2 & 3 are not getting hot. Pipes are hot about 3-4 feet out ...
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1answer
23 views

Splitting a hydronic zone. Zone valves or separate circulator pump?

I had some plumbers take a look at my hydronic system to discuss splitting the single zone. They proposed to use separate zone pumps. In retrospect the other way to do this would be with zone valves. ...
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0answers
28 views

Boiler System heats one room more than all others

I have a two zone older natural gas boiler system. All rooms in the house get heat. One room on the second floor gets hotter than all others. Almost like all the heat is going to that room I don’t ...
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2answers
48 views

How to properly pipe a hydronic heating system

Background: I am installing a hydronic radiant floor heating system myself and getting all the information required is a combination of many different websites. It doesn't seem like there is an all-in-...
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1answer
221 views

What are the steps to drain and refill zone for zone valve replacement?

I have a hot water baseboard (hydronic) heating system, gas boiler. Please refer to diagram of my system below. Ball valves 1 & 2 are supply. Ball valve 3 is return. Zone valves are on supply, ...
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1answer
55 views

Different wirings on 2 thermostats controlled by a 2 minizone system

I was replacing my 2 thermostats controlled by a 2 mini zone system (Trol-A-Temp). One of the thermostat has 6 wires/terminals (Y,W,R,G,O,B). The other one has 3 wires/terminals (Y,W,R). I was ...
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62 views

how to drain a specific heating zone?

I have hot water baseboard heating, with three zones. I would like to drain one of them in order to complete some renovations which requires moving some baseboard out of the way. I'm not sure what the ...
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20 views

How to wire in gas boiler zone valves with out a zvc

Does anyone have a basic wiring schematic for wiring up 3 zone valves without a zone valve controller? They are honeywell zone valves. The boiler is brand new and everything is prewired. It just ...
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0answers
46 views

Are 8-Zone Wiring Centers Compatible With Smart Thermostats?

I'm looking at various wiring centers for gas boiler heating and I'm wondering if they're compatible with the major smart thermostats, such as Nest, Hive, and Honeywell. Wiring Centers: Reliance:...
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0answers
9 views

Honeywell Truzone Panel Power Issue

I redid pieces of my zoning system a few months ago but we had such a mild winter the furnace barely went on. Now that we're getting towards summer the old problems that I had are reappearing. I was ...
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695 views

Why is one of my four baseboard heat zones not working?

No heat in baseboard. How to bleed just one zone. Thanks! Please see picture. ? I have a 4 zone valves. 1) water heater (works) 2) 1st floor air handler (works) 3) 2nd floor air handler (works) ...
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1answer
82 views

HVAC Heat only comes on when Fan is set to “ON” (not Auto)

have a weird problem that JUST started happening. When I turn the thermostat up with the fan set to "AUTO", nothing happens. The furnace does not light and the fan does not come on. This worked fine ...
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39 views

Boiler Zone issue after thermostat install

I just bought a new to me house, built in 1970. I replaced the old mercury thermostats with new programable digital ones. They worked great for the first 12 hours. Kept and read temps like it was set. ...
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1answer
23 views

Does manual operation of a Taco 570 series zone valve operate the boiler?

I have a home with multiple zones with the valves mentioned in the question. The documentation (http://www.taco-hvac.com/uploads/FileLibrary/100-3.pdf) isn't clear about whether contact 3 is ...
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1answer
262 views

Zoned 2 stage heat pump system, aux heat not engaging

Homeowner here...I have a 2 stage heat pump split system with the ducting zoned for 2 zones. The units are as follows: Compressor: Goodman GSZC16 heat pump Zone control board: Honeywell HZ322 ...
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0answers
41 views

Strange behaviour with 4 zone central heating timer (John Guest TM4 / Heatmiser TM4)

I have a 4 zone heating timer (HW, Underfloor Heating, Towel Rail and the 4th zone is unused). I moved into a new build a few years ago. After 3 years my heating timer unit (John Guest TM4) started ...
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2answers
267 views

Why does a system boiler with hot water cylinder not use a diverter valve?

I understand that it doesn't need a diverter valve... But I was thinking, couldn't the system be more efficient with one? For example, the central heating could run at a low temperature (35°-40°) and ...
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5answers
3k views

Most cost effective thermostat setting: consistent temperature vs. lowest temperature possible

The problem: Our heating bills are about 25% higher than our average neighbors according to our bill, yet our temperature is always as low as we can stand it (mid 50's), we have excellent insulation ...
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2answers
2k views

HZ432 and no heat in one zone

I have 4 zones... The following lights are on the HZ432: Heat 1 - red Heat 2 - red Heat 3 - no light Zone 1 - yellow Zone 2 - red Zone 3 - red Zone 4 - red I have heat in 3 zones, but not in one of ...
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1answer
15k views

Are these red lights on my Honeywell HZ432 why my bedroom isn't blowing in heat?

I just moved into a new multi-family house with central heat/AC and the 3rd floor bedroom doesn't seem to warm up very well. When the thermostat is on, I don't feel hot air blowing in from the vents ...
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1answer
476 views

Zone Controller T-Stat Wiring w/ 24V transformer, isolation relays for 2 zones

I have a new Navien SmartZone+ 6-Zone Control for my boiler-based heating system. It is great, except it provides no power on C. I realize the internet has researched the heck out of adding a C ...
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0answers
40 views

Heat pump can't get a zone to 72° F

I have a heating system with both a heat pump and a boiler. The rule for the system is that if the temperature in a zone is 5° F less than called for, then the boiler will come on, but otherwise the ...
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1answer
418 views

Whole house humidifier when furnace is in unconditioned space

I have 2 furnaces, one in the garage and one in the attic. These are both spaces with unconditioned air, so they get very cold in the winter. The contractor who helped me configure my garage furnace ...
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0answers
1k views

How to wire a Taco zone valve controller with ecobee

I'm having an issue with wiring my Weil McLain gas boiler. It was wired up fine and working for a single zone. I added (2) 4 wire zone valves in. So I now have 2 zones, a Taco zone valve controller(...
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1answer
2k views

Can you use 1 ecobee thermostat to control 2 zone valves for heating?

I previously had a single zone set up with 1 circulator. So i added an extra zone. Still have 1 circulator pump and I also picked up a tacozvc 403-4 box to set it up. My question is how can i ...
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3answers
3k views

What are normally-open hydronic zone valves used for?

In a hydronic (hot water) heating system electronically operated valves control whether hot water runs through a particular zone of the building, or not. It seems to be a common setup for the valve ...
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2answers
309 views

Difference between geothermal and regular hydronic zone valves

Taco makes two variants of zone valves - one type for general hydronic use, and another type marketed especially for geothermal use. What is the difference in valves that particularly suits them for ...
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0answers
46 views

Some baseboard in one zone are getting hot and some are not

So I have one zone with two split loops. One loop is getting hot, the other is not. In the boiler room where the zone splits into two loops i can already feel that one is hot and one is barely warm. ...
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0answers
294 views

Nest + opentherm + zone valve

I have a Nest 3G, I'm now considering to change my boiler due to age-related issues. Can someone tell me if I can connect the Heat-Link to both zone-valve (on/off contacts) and boiler (OpenTherm). I ...