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

An Old Debate There are is a very old debate about whether it's better to leave the thermostat at a constant temperature or to turn the temperature down when unoccupied and up when occupied. I am in ...
batsplatsterson's user avatar
8 votes

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

Setting back your thermostat to any reasonable temperature for any reason amount of time will only save 5-10% over the course of a season. Apples to apples You can't simply compare your bill to your ...
Joe Fala's user avatar
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7 votes
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Hydronic heating system uses ONE line for supply and return?

You have a One Pipe System and it looks and works like this one pipe Suggest to Read the article, it nicely explains the details. The main drawback is there is a temperature drop at each radiator ...
Traveler's user avatar
  • 17.8k
6 votes

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

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 throughout the ...
Der Kommissar's user avatar
6 votes

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

And are there any other factors to consider? There is one factor of note that you have attempted to consider: we don't have drafty windows Unfortunately, the idea that windows are a major factor ...
Zhentar's user avatar
  • 1,232
5 votes

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

The zone board's gone bad Since upstairs is broken, yet downstairs is fine, and it's not a thermostat issue, I'd point the finger at the zone board having something wrong with it. Just to make sure, ...
ThreePhaseEel's user avatar
5 votes
Accepted

Run mini-split heat pump heads at different temperatures

It's complete BS. If that was actually a problem, then the system wouldn't let you do that.
longneck's user avatar
  • 21.3k
3 votes

How to test whether or not a breaker is powering a zone valve and thermostat?

The Zone-A-Flow 1311 runs on 25V AC. That is also typical for thermostats in general - though many "dumb" thermostats don't even need any power at all. So what you are looking for is a ...
manassehkatz-Moving 2 Codidact's user avatar
3 votes

One bedroom in a heating zone hotter than others

Since you mention "oil heat" and "hot water tank", it sounds like this is an oil burning boiler, feeding hot water through radiators to the various rooms, with each zone controlled ...
manassehkatz-Moving 2 Codidact's user avatar
3 votes

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

It is a myth that furnaces need to work "harder" if turned off for a while or if the room cools or heats too much. This has been tested and is recommended even by the government: https://www.energy....
Behacad's user avatar
  • 191
3 votes

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

unfortunately the ecobee is not set up to do that. Each thermostat only controls one heating zone, regardless of the quantity of room sensors. The way the sensors are used is fairly flexible. They ...
buckyswider's user avatar
3 votes

How to test whether or not a breaker is powering a zone valve and thermostat?

I would think a simple non-contact voltage detector would tell you whether there's power running to the wiring. While the power is on, determine which wire(s) are hot. Turn off a candidate breaker. ...
FreeMan's user avatar
  • 47.4k
3 votes
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How to test whether or not a breaker is powering a zone valve and thermostat?

Multimeter would do the trick, and is a useful tool that does not cost much unless you go for the high-end ones. Check for 24VAC (usually) on the thermostat wires (either disconnected, or with the ...
Ecnerwal's user avatar
  • 218k
3 votes
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What metrics determine whether a zone valve is a suitable replacement for another?

Let's see if I can answer in a way that steers clear of "shopping question!" A valve has several parameters that you might want to compare when searching for a replacement. For example: ...
Greg Hill's user avatar
  • 30.9k
3 votes

Connecting ā€œCā€ (common) wire for Nest thermostats

Your thermostat C terminal is right there in front of you, between G and the motor terminals Your zone board indeed provides C terminals on the zone terminal blocks. They're between the G terminal ...
ThreePhaseEel's user avatar
3 votes

Two Zone Boiler System. One calls for heat, both zone return lines get hot

Probably thermo-syphoning (heat delivery without pumping. Hot water rises and cold water falls. Might be aggravated by the comically large iron lines (old steam system, converted to hot water? ...
Ecnerwal's user avatar
  • 218k
2 votes

What are normally-open hydronic zone valves used for?

Choice of normally open or normally closed for a valve actuator is part of the overall controls design process, part of which is considering safety/protective functions. As an example, consider a ...
tmband25's user avatar
2 votes

Zoned 2 stage heat pump system, aux heat not engaging

Hey I am a professional hvac contractor that specific zone board will not do 3 stages of heat so it will not work with a 2 stage heat pump and heat strips you need to replace that board with Honeywell ...
William Morgan's user avatar
2 votes

Why does my radiant heater have multiple zone valves?

Difficult to know for sure without asking the designer. For instance, there might be limiting sensors to keep the floor from getting too hot, that might be per "loop zone" rather than "...
Ecnerwal's user avatar
  • 218k
2 votes

Why would part of my second floor not have any HVAC airflow?

So finally figure it out. One vendor removed 1 Zone dampers (top floor) ( which was not the issue ) , then he said "I don't know". SO I kick him out and then study whole system and figure ...
Chandra Maral's user avatar
2 votes

Is it possible to replace a relay on a ncm300 zone controller?

The NCM300 has soldered-in relays that are not in sockets. While it may be feasible to replace a relay if you're an experienced electronics DIYer, that won't necessarily fix the problem. This is an &...
MTA's user avatar
  • 11.4k
1 vote

Is there a way to have one thermostat control a heat pump and a 3 zone hydronic system?

I also have two independent heating systems so I will answer based on my experience. It is not clear which of the three zones your "main" thermostat will control, so I will assume as @...
Jacob House's user avatar
1 vote
Accepted

HVAC turning on heat during cooling cycle

The solution ended up being to transfer the HVAC wiring for zone 1 to zone 3 thus pointing the finger of blame at something being defective with zone 1 on the control board. Guess I need to buy a new ...
robertmain's user avatar
1 vote
Accepted

R and C wiring for Air Handler and Zone Panel

You should wire this controller according to its documentation. It's pretty clear. Each thermostat needs R, C, and the other control wires connected to the appropriate zone terminals. Each heat/...
jay613's user avatar
  • 39.6k
1 vote

Sun room hvac heating and air

Your idea is full of holes as we like to say. As @Ecnerwal stated in his response, you have an area with a different heat loss and gain from the rest of the house. Just adding a supply and return duct ...
d.george's user avatar
  • 12.4k
1 vote

Zoned Forced Air System Runs 2.5X Upstairs vs. Downstairs

What you are seeing is actually normal IMHO and as a result of the second law of thermodynamics. Heat travels from hot things to cold things. You are under the impression heat rises. That is only ...
Ted Mittelstaedt's user avatar
1 vote

Thermostat C wiring issue

You're right: the wiring colors as installed are "wrong" according to convention. The arrangement in the "after" drawing should satisfy the thermostats and operate the system ...
Greg Hill's user avatar
  • 30.9k
1 vote

c wire on a multi taco zone valve boiler

One of those transformer terminals is "R" the other is "C" If the red wire joins to the thermostat "R" wires then the beige wire is "C" Thermostat wires should ...
Jasen's user avatar
  • 21.5k
1 vote

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

The problem with one pump and valves is that you can't ensure that you always get the flow you want when one of the valves is closed vs. both open. So things can be difficult to balance. With two ...
jwh20's user avatar
  • 23.4k
1 vote

How to properly pipe a hydronic heating system

This isn't an "answer" but a caution. I have a hydronic, in floor heating system in my house and let me tell you, there is a LOT of design and engineering to do to get this right. Even the ...
George Anderson's user avatar

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