Questions tagged [hvac]

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

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1answer
28 views

Blue star inverter spilt ac 1.5 tonn

In my spilt ac the big pipe in the outdoor gets freeze when running ac on low temperature but not frezzing when it running in higher temperature. What is the fault if the gas is low in the compressor....
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2answers
290 views

A/C unit cycles on and off during cooling phase

My outside compressor / condenser is cycling on and off, even though the thermostat is calling for A/C. The blower in the house still runs, and the thermostat is working properly. (I opened up the ...
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1answer
17 views

Home AC Filter Location and Half Inch Sizes

Our home AC system allows us to put a filter either in the ceiling intake or directly under the air handler intake. I feel the ceiling intake may be better because more debris will be trapped before ...
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1answer
81 views

1999 Goodman furnace modeld GSMS060-3

Furnace goes through the normal start up process but after 5 minutes the flames go out and I hear a click in the induction motor not the main fan. What could I check. I have taken out the flame ...
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1answer
57 views

Goodman GMNT100-4 Unit- Blower Motor Works for Air But Not the Heat

I have a Goodman GMNT100-4 that air conditioner was working great. However, I recently turned on the heat. The system goes through all sequences fine until it's time for the blower motor to kick on, ...
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0answers
23 views

Installing Ecobee 3 Smart Thermostat in Apartment

I live in Scottsdale AZ and I just purchased an ecobee smart thermostat. I’ve tried multiple ways when wiring up the thermostat. I followed all instructions closely. Can anyone help. The new ...
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1answer
1k views

Converting I+ I- thermostat to 'standard' wiring

I've been replacing my thermostats with the RadioThermostat CT50, which reports to my home-brew home control/alarm system. I have a 3-year old AireEase 4-ton unit in the shop that has a Comfort Sync ...
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1answer
50 views

Why doesn't my HVAC system use the away temperature setting?

I have a Carrier Infinity dual-fuel 5 stage HP w furnace. I set the away temp much lower than the home temp but the HP keeps running to bring the temp up to the next home temp. I would think the ...
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1answer
31 views

Rerouting return air duct in furdown

So I ran into this issue that seems quite gross that it was located inside the furdown in the bathroom, which was becoming layered in gross dust, hair and crap that gets sucked up. We removed it as ...
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3answers
323 views

AC related power outage (partial)? HVAC?

So running into a weird situation that I have not encountered before. Back ground - house was built in the late 60/early 70s - 3 bed 2 bath So we have a weird situation where our house is partially ...
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1answer
58 views

Is negative pressure bad and how to fix?

I have a one story house and I think there is a negative pressure problem. If the central a/c is on and I close the hallway door the hallway heats up like an oven. This hallway leads to all the ...
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1answer
803 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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1answer
66 views

Heat pump always turns on with fan!

If I turn my fan on on my thermostats the heat pump turns on with heat or cool setting There is a jumper wired from green to w1(the heat pump) If I move the jumper to r (24v) and g and turn on the ...
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1answer
32 views

Home Heating Efficiency

See a similar question I posted a few years ago: Heat pump minimum compressor temprature I have a custom built new construction home, but I was not involved with the build process, so I don't know the ...
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1answer
69 views

Heating above ground pool by re-circuplating pool water through tankless, on-demand water heater

Due to covid-19 all indoor pools in my area are closed for the foreseeable future. Kids being swimmers, I purchased an Intex 15' round above ground pool and installed in it in the garage. It worked ...
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1answer
12k views

Troubleshoot AC issue, no inside blower

I need help troubleshooting Rheem RAHE-036JAS, Armstrong G1N80AU125D20C-1, Honeywell ST9160B 1068 Board, Honeywell SV9520H 8034 Gas Valve. About a week ago, AC and Heat were working fine. After ...
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2answers
515 views

Problem with condensation on HVAC ducts inside house

I'm having a pretty serious problem. There is an old sheet metal HVAC duct in my home that is getting condensation that is dripping onto the ceiling of a pantry. This duct is completely internal to ...
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2answers
129 views

Why doesn't my furnace fan run in cool mode?

Ok, the blower unit will run on heat and fan on. However when I switch to auto and cool the blower unit doesn't run. When I have the blower in the "on" position it will run until I switch the ...
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1answer
1k views

C wire and smart thermostat

I'd like to install an ecobee3 thermostat, but I'm not entirely sure about my wiring. The current thermostat seems to only have a W and RC wire coming into it. There is also what appears to be a blue ...
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2answers
4k views

Dripping sound emanating from interior wall space

I've seen some other questions about dripping sounds but wasn't sure if my situation fills the same circumstances or not. I have a 2-story home and only a partial understanding of where the ...
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3answers
5k views

AC shuts but fan keeps running

After running for some time, AC shuts but blower keeps running. NEST says no power to Rh line. Have a Rheem Criterion, have separate breakers for AC and Fan. Twice, I have turned off both and after a ...
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4answers
4k views

How can I resolve a “vent intake or termination” problem on my furnace?

It's June so my furnace has been off for a while. But it's cold today and I have a sick kid home so I tried to start my furnace but it's not working. I'm getting an LED code with three red flashes ...
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3answers
78 views

Wildfire smoke : old electronic air cleaner or normal pleated filter better?

The house we live in has an old electronic air cleaner attached to the furnance. It's a Honeywell F50E 1182. We have lots of wildfire smoke in the PNW right now and am wondering if using this system ...
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2answers
9k views

Half my house losing power, HVAC the key factor

For the past couple of weeks I have been losing power occasionally to half my house. My central AC goes out, half my kitchen, living room and my kids' rooms. There are no tripped breakers though. I ...
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2answers
74 views

What is this in my air duct

I started hearing a whistling sound coming out from the return vent for the air conditioner. So I pulled out the filter to inspect it and noticed there was something odd inside the duct. It looks ...
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1answer
26 views

Can a single 8“ flex duct be split into a 5” flex and 7" flex?

Our house used to have a fur-down A/C unit that fed a series of rigid ducts made with duct board. We'd like to replace a vent in our bathroom (5' x 11') with a 5" flex duct. We'd like to ...
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0answers
10 views

Intermittent fan blower on heat, cool, and off

Fan will run on odd time increment (6 seconds on, 1 min off, 2 hrs on , 3 min off, 20 sec on, 1 day off 12 hrs on etc....). Does this on heat, (satisfied stat) cool and stat turned off. Indicator ...
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2answers
57 views

Is it worth of replacing central AC coil?

my central AC is a 16-year old Trane. According to inspector, the compressor is still good and all the conditions seem to be good, except the coil is leaking. It is an old model so it uses R22. As it ...
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1answer
27 views

Can I use 8" flex duct on a 7 inch rigid duct connection?

I am moving ducting three studs down, so I need to extend an insulated 7” flex pipe run that bridges a 7” elbow with a 7” floor register duct. 7” flex is hard to find locally but I have plenty of 8” ...
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1answer
38 views

How serious is a badly kinked suction line on a split system A/C?

A friend had me remove a section of drywall to see why there was moisture damage at the baseboard height on one wall. I found the refrigerant line that runs from outside compressor to attic mounted ...
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2answers
61 views

How can I know if my HVAC is taking air from outside?

I am currently affected by the US West smoke, so I bought some good filters for my furnace. I also bought extra filters and taped them in my ceilings where the air from the HVAC comes, for some extra ...
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0answers
22 views

replacing ductwork in a mobile home with round duct?

I know that most mobile homes use a single trunk duct that is 14" x 4" and all use a special furnace due to that size being used. , how easy is that to replace? I found out most of my duct ...
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2answers
32 views

What is the dynamic head capacity of this pump?

I am looking to buy a condensate pump that can push water 20' away ( I need to circumvent the fact that I can't slope a drain through the ceiling so I need the pump to push 8' up and then another 10' ...
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1answer
36 views

Condense pump can push water 16' or 20'; does it mean I can run the 3/8" tubing for that length in any direction (and changing the direction)?

I have the 21786 model condense pump described below. The specs say it can push the water up 16' using a 3/8" pvc tube. Does this mean it will do it in any possible direction (my case 8' to the ...
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1answer
1k views

How do you block cold air flow from an AC vent without blocking the vent?

From what I've read it seems that it's a bad idea to cover central air conditioning vents. So what can I do to control the cold air coming through one vent without lowering the AC for the rest of the ...
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1answer
36 views

HVAC fan turned off by itself with associated burning smell

I'm in the PNW and we're dealing with lots of wildfire smoke. Accordingly, I've been running the fan on the HVAC nearly continuously for the last 4 days so that air will go through my electronic ...
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1answer
32 views

Furnace burners shut off an hour after running?

Older furance that wasnt holding pressure. Leak was found and gas valve replaced. Gas is on. Fired it up yesterday for the 1st time. The house has been vacant awhile. We had no problem. Came ...
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1answer
22 views

HVAC started whistling after changing filter

I recently changed my HVAC filter and followed the same airflow direction (pointed arrow direction) as was on the previous filter. Almost immediately after replacing it, I keep hearing a whistling ...
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1answer
761 views

Wiring a C (common) wire to a Triangle Tube Prestige Excellence 110?

Wiring noob here. Can someone give me step-by-step instructions for where and how I should attach a C (common) wire to a Triangle Tube Prestige Excellence 110 boiler for a ecobee3 thermostat? I think ...
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1answer
37 views

Can I use a plastic basin positioned near joists to compensate the lack of slope in a ceiling condense drain?

Is this a design that is acceptable? Basically I am building a small box that will collect water pumped up by the condense drain. I will put this up in the ceiling in the furnace room just between the ...
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1answer
37 views

Is there any way to drill through minerall wool in order to install a pvc pipe?

This is related to this question What type of pipe should I used to build a gravity drain from my furnace to the bathroom plumbing? I am building the red pipe in the below picture, This is the condese ...
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1answer
127 views

C Wire in Air Handler

Can someone please help me find where to connect a C wire for my smart thermostat? Here are some pictures with descriptions. It is difficult to get to the 24v connection in the back. My schematic ...
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1answer
17 views

Sound proofing a panned floor joist return run (basement apartment)

I'm building a basement rental unit in our home. We'll be living upstairs so I'm doing my best to sound separate the upper and lower units. I'm using a seperate hvac system for the basement (baseboard ...
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1answer
45 views

Purging boiler with just one drain valve

I have read through how to purge a zone, but I still have a question. I don't have individual drain valves on each zone. So I am unsure what the process would be in order to purge a zone. And to ...
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3answers
43 views

Condensation on just 1 duct in unfinished basement

We live in the Northeast (PA) and have a new construction home that we have lived in for a year. The home is small (1300 sq ft, open concept first floor) with an unfinished basement. The ceiling of ...
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0answers
11 views

Ducting options for HRV Install

Hoping to install an HRV in our house to improve winter air quality. One floor ranch with a full basement located in Vermont, so cold winters. The upstairs in entirely finished and there is no ...
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1answer
213 views

High pressure on heat cycle

Newly installed heat pump works on AC all pressures are with in spec but shuts off on high pressure when you go to heat cycle. The pressure goes to 510 and kicks the high pressure switch.
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3answers
3k views

Does my furnace suck air from outside?

I've tried Googling this but the stakes are quite high and I don't want to be wrong, so I'm asking here. Wildfires are raging in California where we live, and the Air Quality is nearing the 'hazardous'...
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1answer
435 views

Why does my fan switch run condenser fan instead of blower?

I have been having this problem for a while and have just not run blower without thermostat calling for heat or AC, system seems to run fine in heat or cool mode, but if I turn on FAN by itself the ...
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1answer
191 views

Is there a way to change the location of HVAC air filter?

We bought the house recently. Heating system was recently installed by the previous home owner. I cannot believe they did not think of this but the place for filter is inside the furnace. The problem ...

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