Questions tagged [hvac]

(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.

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52 views

ECM motor in air handler not reaching full speed

I replaced the motor back in this thread at the height of the summer heat: old question The old motor was fine as I opened it up and a bug got fried inside and caused a short. I ended up with a ...
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55 views

Risks of Unplugging Lennox HealthClimate Unit

I bought a home with a space age lookin' Lennox HVAC. Instead of using a basic paper air filter like you can get at a local department store, the unit has a big paper air filter and a photocatalysis ...
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344 views

Installing new thermostat without a C wire. Can I use my heater/R wire instead? Random 13V as well

I'm installing a thermostat, but I don't appear to have a C wire. My old thermostat had R/RH,Y,G,and W. It's an AC system that was setup before I got here. The actual AC unit is a long way away and ...
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45 views

Reverse motor direction not working (just stops)

So I successfully purchased and installed an Mars 10204 motor and installed it in my condenser unit outside (the previous GE motor died a horrible death after years of service). Only problem is it is ...
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139 views

Replacing Capacitors in HVAC Condensor

The fan on the outside condensor of my HVAC system stopped spinning. If I give it a push it starts up. My understanding is that this typically is just the capacitor going bad and is a relatively ...
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635 views

Adding a C wire

I know this question has been asked multiple times and I'm going to try some of the methods I have read in other threads but wanted to ask this question since I didn't see anyone else's wired the way ...
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34 views

What caused this motor to short?

These pics are from my ECM motor in my air handler. I knew the motor was my problem when it failed a phase-resistance test between the windings. The new motor passed the test and works great. I ...
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1answer
941 views

Honeywell VR8300A3500 Single Stage Heat Gas Valve to Ecobee3 with C wire

Hey everyone have a quick question regarding a honeywell VR8300A3500 Single Stage Heat Gas Valve and the introduction of a Ecobee3 wifi enabled thermostat with a "C" wire. just want to make sure i am ...
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54 views

Clean filters and dusty house

I have good airflow and a very dusty house and large dust balls. I have used all kinds of filters including the pleated. When filters are checked in 3-6 months they are as clean as the day they were ...
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2k views

AC capacitor testing with multimeter

When running through my check list to start the AC for the spring/summer I noticed the outdoor fan was not running, hence no cooling. I'm using a basic digital multimeter to test a capacitor with the ...
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1k views

Thermostat will not power on with C wire, but it has voltage

I recently purchased a Honeywell wifi thermostat and tried to hook it up as a replacement for an existing battery powered unit. I have a typical forced air HVAC setup with gas furnace (no heat pump), ...
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2answers
3k views

Why might a thermostat refuse to switch from Heat mode to Cool mode?

I have this Honeywell RTHL2410C programmable thermostat and typical Florida electric AC system. Starting this Spring, it has started behaving strangely when switching from Heat to Cool mode. The ...
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399 views

time delay adjustment on Rheem elect furnace

Upon a call for heat the blower motor starts too soon resulting in cool to cold air coming out of the ceiling registers until heat strips start heating up.Wires coming from thermostat connect to ...
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1answer
770 views

Need help adding a C wire for a wifi thermostat

With the increasing popularity of wifi thermostats I know this question has been asked many times, however I'll ask it again fr my specific situation. How do I add a "C" wire to my existing air ...
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911 views

HVAC - hot air flowing on both zones when only 1 zone should be on

I have 2-zone forced air heating, with separate thermostats for each zone. Normally, if the thermostat in zone 1 triggers the system to go on, the heat will only blow through the vents in zone 1. ...
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2answers
242 views

Replace insulation in a Trane HVAC? (TWE030C140B0)

I found a little mold on the foil covering the insulation in my TWE030C140B0 air handler/ AC/Heater. I am 95% sure I have the moisture problem resolved and now I need to replace the insulation. Does ...
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97 views

Temporary Remove Flex Duct

I am about to replace a load bearing wall in unfinished basement. There is flexible duct attached to plenum that I need to temporarily move out in order to put the beams in. Do i just need to cut ...
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70 views

Is there a “bending rigidity index” of some sort for semi-rigid aluminum ducts?

Some semi-rigid aluminum ducts bend easily and others do not. I want to purchase semi-rigid aluminum ducts online of a specific bending rigidity/stiffness that minimizes sagging but can be easily ...
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48 views

How to connect 4 fan coils with one wall control thermostat?

I have 4 fan coils (Sabiana sk-22)and I want to connect them with one wall control thermostat. How can I do?
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35 views

Thermostat and thermostat system for small business with several units and tenants

Am the facilities guy in a small church and pre-school. There are 8 heat pump units through out the church/schoool. Each has a stand-alone thermostat and they are all different. I would like to get ...
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2k views

A/C still blows when unit is off.

Our A/C is turned off but we still get cold air coming out of the vent diffusers. This is from our downstairs unit. Is that a problem?
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299 views

Can I remove HVAC pipes after exposing the ceiling?

I recently removed the drywall ceiling from my basement and have two related questions about removing the HVAC ducts/pipes. Pictures attached here: http://imgur.com/a/qep4w 1. Is it OK to remove the ...
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154 views

Testing the exhaust of a natural gas furnace?

I recently had maintenance performed on my natural gas forced-air furnace. During this maintenance, the technician went outside and used an electronic handheld device with a wire-attached probe to ...
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312 views

How can I install a furnace register in a kitchen-cabinet toe kick?

I'm planning to install new kitchen cabinets. I'll be covering up the kitchen's existing sidewall diffuser with new cabinets, so I'd like to relocate it to a new register in the toe kick of the sink ...
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2answers
15k views

why does my heat pump wiring diagram show 7 wires going to the thermostat but the thermostat only says it needs 5?

Here is a link to the wiring diagram for my heat pump. The thermostat that I am planning on buying has the following terminals C, G, Y, O/B, RC, R, Aux, E, and L. The instructions say to jump the RC ...
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2k views

How can I tell if my bathroom ceiling vent is working properly?

Seems to take the vent forever to clear shower vapor from room. I purchased a vent that had a good rating. It is vented to the outside. How do I know if it is working properly and actually venting to ...
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97 views

How do I troubleshoot my central A/C?

It's 79 outside right now. It's been running for hours and it's remaining 79 inside. I'm in a brand new 2 story home in Monroe, OH. It has rained a lot recently but I just feel like it should be ...
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120 views

Why doesn't my A/C get power when using the alternate C-wire thermostat hook-up method?

I changed my old Honeywell thermostat for a new Honeywell WiFi thermostat. I installed it just as the directions stated. I used the alternate C-wire method as the old unit did not have one. ...
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10k views

How do I size a wall sleeve for a through-the-wall air conditioner?

We are shopping for a through-the-wall air conditioner. We do not currently have a hole in the wall with a sleeve in it. We are trying to figure out what sleeve to buy. The air conditioner we like ...
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8k views

What's causing my draft inducer to stay on?

I have a new, 3-year old, high-efficiency, gas furnace in my home. I recently realized that my draft inducer, which normally kicks on before the burners and before the main blower, is not stopping. ...
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1answer
2k views

How can I properly drain heatpump condensate?

I have a heat pump in the attic That drains to the ground outside two floors below. I naively added a hose fitting so I could redirect the water where I wanted it, slightly up hill. This created a ...
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2answers
214 views

Is there some type of coating I can use to prevent condensate on my HVAC ducts?

I'm getting a lot of condensate on my HVAC ducts that run though my first floor (and HVAC blower) especially in July / August when humidity levels are outrageous (in NJ). The 1st floor space space is ...
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1answer
2k views

Fan works for heating, but not for AC, where to start?

Our new place has a working AC (meaning that the physical box outside spins and can produce cold air) and a working fan (meaning that the fan spins and is able to put air out to the vents in the house)...
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1answer
2k views

How to connect Nest in Europe

I found a question regarding the Nest thermostat here. But that is only a question "Will it work?". Thanks to that I know it WILL, the problem is...HOW. I know the wire naming conventions are ...
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16 views

Need help connecting c wire, unknown red wire from one unit to the other

We are replacing our old thermostats (installed in 2006) with two smart thermostats. We have 2 separate units and thermostats. We have an unused blue wire (c wire) at both thermostats. We thought we ...
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14 views

How to seal seams in a traditional Cedar wood dry sauna

I just built a new, indoor, traditional dry sauna made with Cedar wood. https://www.costco.com/almost-heaven-bluestone-3-person-steam-sauna.product.100485086.html During assembly, some of the ...
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4 views

Older Tempstar furnace, fan runs all the time though set on auto, suspect high limit switch, cannot find part

Older Tempstar furnace, fan runs all the time though set on auto, blowing cold air when flame is off, tried smacking high limit switch, that worked, but problem remained when furnace temp turned back ...
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1answer
16 views

Replacing swamp cooler pads

I have a AercoCool Pro 4800 swamp cooler roof unit and need to get new rigid pads for it. Do the pads need be specific to the brand according to the cooler's spec sheet, or can I use any pad that is ...
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42 views

CFM ratings of inline duct fans far exceed the ratings for their intended duct sizes. What are we to make of this when designing a system?

My garage is 25×29' with 10' ceilings, so 7250 cf. I'm hoping to be able to turn over the air every 3 minutes or so, so aiming at using 2 fans rated at a total of 2400cfm. The fans I'd like to use ...
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10 views

Replacing flexible.duct work on AC unit

I purchased the correct size flexible duct for the air supply, but was unaware that the return side is 2 inches bigger. Since I am unable to purchase the bigger size until next week, is it safe to run ...
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15 views

ductless air handler install

So I am about to embark on an install of a 6 zone ductless system and I have 2 questions around installing the air handlers in each bedroom. I am using a branch distribution box which needs to be ...
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9 views

Weak airflow after replacing furnace and add new A/C

I had Furnace HVAC before and I made a mistake not knowing what I had. We never had A/C. Recently I purchased this package from Costco: LENNOX ELITE SERIES AIR CONDITIONER SYSTEM XC13 LENNOX 80% 2-...
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33 views

Ecobee 4 - C Wire Connected but no power

I have an extremely old HVAC system (Goodman Janitrol Model GMNT060-3) and had a previous WiFi thermostat connected with a C Wire. I am now upgrading to a ecobee4 and cannot get any power to the ...
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6 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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10 views

Gas Fireplace help

Our fireplace won't stay lit. It will light fine and work okay-Until we put the front cover back on. Then it clicks a few times and goes out. Please help!
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27 views

Honeywell Home Thermostat - wiring issues?

I have the Honeywell Home - 7-Day Programmable Thermostat. When my roommate installed the device it was winter and everything appeared to work fine. Now that it’s heating up, it’s impossible to cool ...
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38 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
48 views

Discrepancy in thermostat display temperatures

On the second floor of our house there are two thermostats on opposite sides of a narrow hallway. One controls the baseboard heat and on the other side of the wall it is on is a room. The other ...
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32 views

FAU Removal and Storage

I'm looking to move my FAU in a few months to the attic, but right now I need it moved out of my basement for a remodel. Can an FAU be stored in this manner for short term? Logic leads me to think so, ...
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1answer
44 views

Splitting Wires for Thermostats

A friend of mine wants to upgrade his thermostats to WiFi thermostats but the thermostat wires ran to the thermostats are missing the C wire. There are 2 thermostat lines ran from 2 units to 2 ...

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