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

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1answer
47 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 ...
0
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1answer
30 views

Blower shut off but the AC unit ran for 20-30 minutes afterward

Last night I turned my AC down a couple degrees before going to bed. The AC was running at the time, so when I set the temp below the current temp, the blower turned off. After getting in bed, however,...
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2answers
38 views

Does the air temperature outside at the time of spring inspection matter when the tech comes to inspect and clean the inside and outside units?

I have semi annual inspections done on my A/C units both inside and outside. Will the temperature outside effect the tech's ability to properly clean and evaluate the operation of the units? The ...
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0answers
17 views

HVAC Return Duct - Joist Panning alternative

Joist Panning(Lining) seems to still be popular. However, a have read in a few places that joist panning is difficult to seal and can pull air from unconditioned spaces. I am looking for an ...
3
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2answers
88 views
+50

Is it OK to have an air conditioning vent above a kitchen cabinet?

We're getting proposals to add central air conditioning to our house. We currently have no ductwork so adding ducts and vents is part of the project. One possible duct location is on the ceiling over ...
2
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2answers
59 views

How to install small damper in a duct?

I need to install a Honeywell 10x10 damper into a 11x11 duct. Options that I came up with: build an adapter to reduce duct to 10x10 (alternatively I can use 12x12 damper and build adapter to ...
0
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0answers
23 views

A/C unit blower motor not working all the time

Blower motor will start and stop any time it wants. Replaced motor, cleaned connections, it still gives me problems. Outside unit will stay on and shut off when it is supposed to.
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1answer
191 views

Why isn't my Lennox G26Q3/4-100-6 furnace firing up?

I replaced the batteries, does not click when it calls for heat in the thermostat. fan blows but no heat. I took off inspection door, held the safety switch in, a blue light is blinking constantly, ...
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6answers
56k views

What could be causing an A/C blower motor to turn off randomly?

The Blower motor on my AC unit turns off at random times while the outside unit continues to run which is causing the coil to freeze up. The blower won't come on for 30-45 minutes after the AC has ...
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0answers
15 views

cooling and heating

We have A RASTRA built homeuilt in 2007, we purchased two years ago. We purchased a new HVAC system, all new windows and slider, but it is still super hot in the summer and cold in the winter, ...
0
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1answer
22 views

Can exterior exhaust vents be stacked on top of one another?

A bathroom toilet room already has an exterior exhaust vent as seen in the pic. Is it within code and ok to install another, and identical, exhaust vent directly below the current one. The Master ...
2
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2answers
49 views

Can I replace my furnace's high limit switch with a comparable third-party part?

I have an older Lennox furnace. The high limit switch (#60T15,130F) has gone bad. I haven't been able to find on-line this part number with the exact temp limit specs, and Lennox no longer carries ...
0
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1answer
29 views

HVAC compressor turns on when calling for fan only

I just moved into a new apartment with HVAC, and I'm looking to control the thermostat with a few Phidgets (I had already invested in that ecosystem, so I just needed a couple of relays). Anyway, ...
0
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1answer
108 views

Trane furnace pilot wont stay lit

I have a 1983 Trane gas furnace, Model BLU108E936B1, the pilot light went out, I could get it to relight but wont stay on> Changed the thermocouple, same results, Pilot light doesn't look right as I ...
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1answer
33 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 ...
0
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1answer
302 views

Fan coil wiring problem with new thermostat

I'm trying to upgrade to a new line voltage thermostat. The new thermostat has many more connections, including three fan speeds. My current system has a manual fan switch on the wall so all I need ...
1
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2answers
113 views

HVAC System Just Installed Yesterday and AC condenser outside is blowing cold ir

HI my just installed ac condenser is blowing cold air out side . when I put my hand over it and move it around most of the air is hot but a portion of it is cold. Is this right ?
1
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1answer
1k views

Connected C-Wire to new Smart Thermostat and Furnace board and still no power

I need help. I've been surfing the internet and have had no luck finding answers to my situation so am hoping for some guidance. I've seen other questions here answered but none that suit my issue so ...
3
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1answer
380 views

Why won't my thermostat control the HVAC anymore after trying to switch thermostats?

I bought a new Nest thermostat which is supposed to be compatible but needs a professional installation (advice that should have been heeded by non-professional electrician me). This is to replace an ...
0
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3answers
19k views

Is it normal for the A/C to be dripping from top pvc that's coming from attic?

I thought I remember being told that water should drip (condensation) from the bottom pvc that comes out of the house but it should never drip from the top pvc. I thought he told me that if it ...
0
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2answers
67 views

Aprilaire 700 humidifier not working properly

The fan does not seem to be running. How can I determine what the problem is? I'm not sure if it's the fan, solenoid or the computer board.
0
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1answer
1k views

Can I have a separate thermostat for a wood boiler?

I want to wire a separate thermostat for my outdoor wood boiler so that just the furnace fan will come on without the propane kicking on. This is a Coleman furnace. Is this possible and if so, how ...
0
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1answer
35 views

A/C freezing damaged air handler blower?

While I was moving, I left my front door open for at least two hours. As a result, my coils froze up outside and inside the return and the inside handler. The vents were not putting out any air and it ...
7
votes
6answers
46k views

How often should I run a bleach and water solution through condensate lines?

How often do you need to run a bleach and water solution through the condensate drain lines (of a heat pump) to keep the bacteria away? What are the recommended parts (e.g. 1 part bleach, 10 part ...
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1answer
53 views

Fan runs when in “on” mode, but not when in “auto” mode while in “cool” setting

I have a Rheem RHPL-HM2421JC air handler, a Rheem 1.5 ton heat pump condensing unit, and a comfort control thermostat. The heat and fan worked well over winter. I can also turn the fan mode to "on" ...
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0answers
20 views

Problem with Condensor

Something is wrong with my Lennox HVAC unit. The air handler comes on but the condensor does not. There is no sound. My condensor circuit board is flashing red and green together and at a slow pulse. ...
0
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1answer
47 views

Multiple C wires? [duplicate]

I recently received a wifi enabled thermostat which I thought I could install easily since I saw an unused wire (Blue) which I assumed would be the C wire behind the current thermostat. When I went ...
0
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1answer
184 views

How do I wire a thermostat with an external 24V transformer?

My current wiring has 5 wires, R, Rc, Y, G, and W wires. No C wire. I've added an external 24V transformer and connected one wire to the C connector but don't know what to do with the other. If I ...
0
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2answers
578 views

How to fill / seal in-slab hvac ductwork?

My house is built on a slab. Within the slab are "channels" which act as ducts for the HVAC system. I assume it is partially lined with metal but based on photos from an HVAC-cleaner, it's hard to ...
1
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1answer
116 views

Hvac fan runs and shuts off in a cycle when in heat mode

I have a Heil hvac model. N44336336GKE100, The system works ok when in cool mode but when in heat mode the outside fan runs for 30 sec then shuts off for 20 sec and continually repeats the cycle. I ...
0
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1answer
31 views

HVAC Drain Pipe Broken inside Wall

Can I get to the drain pipe through the drywall inside the house? When attempting to dissemble my exterior drain pipe (lower main pipe), I broke something inside the wall and subsequently there is ...
0
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2answers
48k views

What size breaker and wire do I need for central air conditioning?

I am getting ready to hang drywall in my basement but before I do that, I need to run wire from the main panel upstairs to the future location of the central AC furnace through the basement ceiling ...
1
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1answer
2k views

AC Blower running very slowly

I have a Ducane heat pump. When running in AC Mode, the outdoor fan and compressor kick off just fine. The blower fan seems to kick off as well, though it's not putting out very much air. I can ...
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0answers
18 views

are these hvac wiring correct [on hold]

I have a asx16036 single stage 3 ton amana condenser and a amana capf3636b6 coil. I have a focuspro th6220D honeywell. the bottom picture letters that are blurry are CRWGY
13
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2answers
17k views

Can I run a central air conditioner in the winter?

What happens if you run a central air conditioner when it's below freezing outside? Is this expected to work? I know, it sounds crazy, but that's because you don't live in an overheated New York ...
2
votes
1answer
358 views

Want to add a WIFI thermostat, but no 'C' wire… only 2 wires to each thermo

i have a 5 zone radiant floor, oil fired heating system. Each thermostat only has 2 wires running to it. i have a TACO SR506 switching relay that receives the wires from each thermostat and controls ...
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0answers
13 views

Suggest a Branded HVAC [closed]

I would like to buy a HVAC Please suggest me a branded hvac company form Siemens, [Honeywell], nivocs controls
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2answers
72 views

Run HVAC fan throughout the day for comfort

At my old house, we replaced the HVAC with a high efficiency unit that came with a thermostat that would blow, say, 50% to 70% of the time for air movement to increase comfort level. I'm not sure but ...
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0answers
27 views

HVAC - concern with one condenser vs dual on new home AC system

I would appreciate any advice on pro/con of my situation. I'm not sure how far I want to go contesting it with my builder. Here's the issue: I have a new home under construction and the contract ...
0
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1answer
19 views

What is required to recharge refrigerant in a built in ICE CAP Air conditioner that cannot be moved?

My apartment has a built in air conditioner unit. The brand is ICE CAP and it doesn't look like there is any way to remove it as its built into the cabinet frame that has an external exhaust outside. ...
0
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1answer
42 views

Could recent electrical work cause lights to dim when A/C turns on?

Last week I had an electrician in to put in some new wiring; I also had an HVAC guy come do the annual maintenance on our system. Since then, the lights in our living room flicker whenever the A/C ...
1
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1answer
42 views

Installing an Ecobee3 - Add C Wire with PEK

I have another post with this question (Adding a C wire) but thought I'd clear up any confusion with this new post and I'm adding a diagram also. The diagram shows my current thermostat wiring and not ...
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0answers
11 views

I need to know how many stages is my air conditioning unit

i have an amana asx16036 outside ac unit. inside is a amana capf3636b6 coil. some websites say they are single stage and some say they are two stage with a scroll compressor. can someone help me out?
1
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1answer
145 views

Best Way to Heat a Tri Level Home

I have a tri-level home, which is approximately 1600 sq.ft. Presently I have electric baseboard heat, with a pellet stove on the main level. I am looking to upgrade to a better, more centralized ...
4
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11answers
15k views

Would putting a sprinkler on my roof help cool my home?

Anyone ever put a sprinkler on your roof to help out your A/C on unusually hot days? Just wondering if it helps.
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3answers
39 views

Is it okay to use two 20x20 air filters instead of one 36x20 for my home AC?

I am replacing the air filter for the first time. I came to find out the person before just used two filters that were size 20x20 and overlapped them. The size of the actual duct is 36x20. The 36x20 ...
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1answer
39 views

Aprilaire 560 repair

My Aprilaire 560 humidifier will do a bang click many times before it turns the blower on. I replaced the solenoid valve with a new factory part and it still does the same thing. What next?
2
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0answers
14 views

Trane Weathertron Stat to Honeywell RTH2510

I have a Trane Weathertron thermostat thst I am replacing with a New Honeywell RTH2510. This is a heat pump with auxiliary electric heat. The wires on the Tran thermostat are. R, T, O, G, Y, B, X2 ...
2
votes
4answers
2k views

HVAC system that pulls-in cold air from outside?

My house has an existing forced-air heating system and I'm looking at getting central AC added in a few weeks' time (indeed, I've booked contractors for estimates next week). An AC system would keep ...
0
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1answer
67 views

what is the cause whereby compressor working gets hot and stops, after cooled down picks up

My challenge was that, I have this refrigerator I'm working on and after awhile it is working and then the condenser become hot as the compressor discharges excess heat, which as time goes on ...