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 ...
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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 ...
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  • 6,116
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 ...
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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 ...
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  • 1,182
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, ...
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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. ...
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  • 31k
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 ...
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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 ...
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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....
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  • 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 ...
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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 ...
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  • 139k
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: ...
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  • 20.4k
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 ...
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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 ...
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2 votes
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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.
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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 "...
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  • 139k
1 vote
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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 ...
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1 vote
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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/...
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  • 18.6k
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 ...
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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 ...
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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 ...
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  • 20.4k
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 ...
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  • 14.2k
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 ...
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  • 20.6k
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 ...
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1 vote

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

I turned off both valves 1 & 2 figuring it isolated most things and valve 2 didn't seem to close all the way. The steps I used to drain were: turn supply off turn return off open hose bibb open ...
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1 vote
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Does manual operation of a Taco 570 series zone valve operate the boiler?

After speaking to a service tech, I've confirmed that the design of the Taco valves is that the boiler contact is not energized when in manual override. However, he also stated that he's seen ...
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  • 3,888
1 vote
Accepted

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

Radiators don't put out a lot of heat at that temperature, so you'd need a lot more area, so the heating loop usually runs warmer than you'd really want the hot water cylinder to get up to, so the ...
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  • 599
1 vote

HZ432 and no heat in one zone

Here is an image from the installation manual of your zone controller: The fact that Heat 1 and Heat 2 are red means that some combination of thermostats is calling for stage 1 and stage 2 heat. The ...
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  • 26.7k
1 vote
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Zone Controller T-Stat Wiring w/ 24V transformer, isolation relays for 2 zones

That is correct, yes That is a correct way to wire the coil-sides of two isolation relays -- one end of the secondary provides C to the relay coils and thermostat C wires, while the other side of the ...
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1 vote

Whole house humidifier when furnace is in unconditioned space

It does not need to be installed in the unconditioned space near the furnace. It should be in the duct that feeds all the others. Look for a powered humidifier. It will need a 120V outlet, water ...
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