Questions tagged [hvac]

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

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1answer
982 views

How can I add a C-wire to a Venstar T5800 thermostat?

I am trying to replace my existing thermostat. My old thermostat has: Rh, W (coming from the heating unit). Rc, Y, G (coming from the AC unit). On the Venstar T5800, I can map as follows: Rh+Rc -...
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1answer
329 views

Why is there a 1/2-inch hole drilled in my heater exhaust?

I have a Carrier high efficiency furnace which uses 2-inch PVC pipes to pull in combustion air from outside and exhaust the combustion gasses back outside (through a concentric vent, but that's not ...
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2answers
433 views

A/C freezing lines

Issue: evaporator/suction line freezing up in A/C mode. Actions: Replaced fan motor and evaporator coil (no air coming thru old one/beat up petty bad). Relevant Information: Refrigerant Type: R???...
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1answer
168 views

How can I protect an exposed refrigerant pipe outdoors?

I have approx.12 ft. of copper pipe carrying freon laying on top of the ground. Best way to protect it without cutting in two & loosing all freon? (Not enough slack to bury.)
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2answers
157 views

Is my whole-house humidifier installed and working as expected?

I have a Honeywell whole house humidifier model HE240. Its installed on the warm air supply. I thought this would put the humid air into the warm air stream. Instead its blowing air to the cold air ...
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0answers
35 views

Very Old thermostat with TR wires

I want to buy a new smart thermostat, but am confused on the old wiring. I have single zone 120year old gas boiler (converted from coal, then oil, now gas). No cooling. The old honeywell thermostat is ...
2
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2answers
71 views

What steps should I take to prepare for using a thermal camera?

I plan on renting a thermal camera to detect heat loss (e.g., missing insulation, leaks in HVAC) and water damage. Outside temperatures are getting down to freezing at night but are mid-40s during the ...
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0answers
43 views

Seal old ductboard from inside with duct mastic?

For the next few days, I have what appears to be an opportunity to easily and cheaply make a small improvement to the overall airtightness (or nearly complete lack thereof) of my house's 40 year old ...
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1answer
270 views

C Wire placement in HVAC?

I'm installing a new thermostat and the previous one did not have a C wire connected. Tracing in back to the HVAC, I can't see a C output connection? Based on the wiring diagram (and reading other ...
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0answers
18 views

Honeywell Y8150A1017 Ventilation System

We recently bought a house in North Carolina and the HVAC system has HONEYWELL Y8150A1017 fresh air ventilation system which seems to call for fresh air exchange quite often. In the winter, the air ...
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1answer
28 views

How does one properly seal a celling vent of a forced air hvac system?

In a room that may have had some kind of condensation on the past, how should one go about sealing the area around the vent hole in the ceiling, specifically to reduce the likelihood of returning ...
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0answers
25 views

Suggestions on where to relocate a wall register I'm enclosing in a closet? (with labeled floor plan attached). Thank you!

I'm looking for some suggestions on where to relocate the HVAC wall register (shown in red), as I am planning to enclose it in a closet. It comes from 3x7 rectangular duct into the 2x4 wall and rests ...
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1answer
15 views

What is the proper replacement igniter for my York furnace?

I replaced one of these before on another unit but the part number was printed on the igniter. This one is not so, being ignorant to HVAC I just want to make sure I get the appropriate part. York ...
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1answer
280 views

How to handle unattached ground wires in boiler fusebox/control panel (sub-panel?)?

I don't have enough of an understanding of HVAC to know if the pictured boiler fuse box is considered a control panel or a sub-panel - but some wiring issues there lead me to needing to understand ...
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5answers
15k views

Why would said gas furnace keep shutting off?

Seems that I have a gas furnace that is having some sort of heat/air sensing issue. Basically it shuts off after running for a minute or two. But if I remove the top plate of the furnace itself it ...
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1answer
37 views

Furnace Troubleshooting- Inconsistent Error Codes

My American Standard furnace ("Standard" Model, year 2003, 12 or 13 SEER) gave an Error Code 2 when first turned on- "External lockout, retries or recycles exceeded." (4 fail to ignite cycles ...
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1answer
29 views

Can’t find breaker for AC unit

I have 2 AC units and I’m installing Ecobee thermostats. The upstairs unit is on the main panel and I was able to turn it off and install the thermostat. I turned off the main breaker and the ...
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1answer
311 views

Should I put a surge protector on the 110v to my Trane furnace

I just had to swap out the fan control module for my Trane furnace. The service person said it might have failed due to spikes on the 110v line. There were downed power lines in the area within the ...
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1answer
68 views

Why the noises in the new furnace?

A company installed a new HVAC system 2 weeks ago. The furnace model was new: 58TNOA110C21–20. I initially ordered 58CVA110-20 but they said it will be out of market soon in August. So they installed ...
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1answer
259 views

How should I jumper the transformer to use a thermostat with my heat pump?

I am hooking up an aftermarket blower motor on my Trane XL 1400 AC/heat pump. I have a black, blue, red & white wires coming out of the new motor. I am bypassing the circuit board so I am ...
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2answers
100 views

How can I best connect this metal gas flue pipe to the old asbestos cement chimney pipe?

The asbestos cement pipe here can't be changed, but how can I make a robust fix for this junction to the a heater flue pipe? The gas utility is suggesting flue tape, but that's crazy. Tape won't ...
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0answers
16 views

Water not circulating through baseboards

2 zone (1 radiant floor, 1 baseboards) hot water heating system. Radiant floor (t’d off main feed) seems to be working fine. None of the baseboard loops are hot, and the pipe was hot before the ...
2
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1answer
46 views

Mini Split HVAC System Size for a 1700 Sq Ft basement,,,

I have a 1700 sq ft basement on Long Island, NY. It is a less than 1 year old condo with a finished basement. The initial gas heating was supposed to be a separate HVAC zone, but with only one zone ...
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2answers
56 views

Theory: How do thermostats without a “C” common wire get powered?

My simple question is: When a thermostat has four wires: white, red, green, and yellow, the red is for 24V (AC?) and the white/green/yellow are for heat/fan/cooling. The role of the thermostat is to ...
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1answer
197 views

Oil furnace fan won't shut off when “heat” plug is connected to control board

I was changing my thermostat and I attempted to make the swap live without turning power off. When I connected new thermostat, the fan kept running. Ruled out bad thermostat and wire short by ...
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1answer
380 views

Thermostat C Wire (Possibly Unconnected)

I purchased a Honeywell RTH6500 Wifi Thermostat, which requires a C wire. My old thermostat showed a connected blue C wire. However, it was battery-powered. If I removed the battery, the thermostat ...
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1answer
281 views

Connect Wifi Thermostat to Goodman GMP050-3?

I'm trying to connect up a wifi thermostat to Goodman furnace, specifically the GMP050-3. I've done some reading on this but I'm still not quite sure how to go about it. Specifically, I'm not sure ...
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1answer
31 views

Should whole house humidifier be draining when heater/fan is off?

I have an Aprilaire 700 whole house humidifier with a manual mode humidistat on the return. I noticed that the unit was draining water even when the heater/fan was off. Is this expected? I just hear ...
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2answers
2k views

What size start capacitor should I buy for my refrigerator compressor?

What size (in horsepower) 3-in-1 start capacitor should i buy for my fridge compressor? I have an LG LRSC26922TT from 2003. The compressor isnt staying on due to (i think the PTC hooked to the ...
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1answer
56 views

Trane Furnace Fan Works, But Heater Won't Run

As stated, my heat isn't coming on. When this started: Everything has been all fine and dandy all winter. The other day I ran the fan only for a few hours without the heat. After this, my heat ...
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3answers
517 views

How do I bleed a noisy radiant heat system?

I have a gas fueled (converted from oil just a few years ago) boiler in my basement with an integrated tank-less water heating system for the showers/taps/etc. The output is three zones as shown in ...
2
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1answer
562 views

New Thermostat installed but compressor comes on immediately

I have a new Insteon Thermostat that I'm using to replace my prior Honeywell t-stat. This is installed to a relatively new HVAC system (both AC and Heat) that DOES have a "c" wire. I've attached the ...
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1answer
23 views

Furnace shutoff switch outlet only hot when furnace is running

I have an old Aprilaire 700 powered by the 110v outlet on the side of my furnace. I recently replaced the old humidistat with a newer Aprilaire 60 Digital. This humidistat comes with the blower ...
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2answers
58 views

Ruud furnace keeps blowing 24 VAC 2 Amp fuse within 12 hours

Help! 20 year old Ruud 90 Plus condensing gas furnace with JCI G961DAJ-2401 controller keeps blowing its 24V AC 2 Amp fuse. I tightened the wires, nothing looks wrong. I measured the current for each ...
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1answer
6k views

How do I connect a WiFi thermostat to my furnace's primary control?

I would like to install a Honeywell WiFi controlled thermostat to connect to a Honeywell R7184U primary control. My question concerns the "C" wire. The R7184 has the terminals labeled 1, 2, 3 and 4 ...
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1answer
77 views

How to retrofit existing kitchen exhaust fan

I'm remodeling a kitchen that is circa 1940's. In the kitchen is an exhaust fan that sits inside a 3.25x10 duct. I would like to keep an exhaust fan in this location and re-use the existing duct, ...
2
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1answer
113 views

Another “How do I add ”c" wire to boiler for Nest

I have tried searching this forum and others, but I could not find anyone with a situation like mine. I thought it better to ask here, rather than damage something. I have a Lennox wall mounted ...
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1answer
147 views

Which terminal should I connect it to for a “C” wire on an american standard AM4A0A30

I'm trying to connect a 3rd gen Nest thermostat. I have a 2 zoned heat and 1 zone AC. The zone with this thermostat has a boiler wired Rw, W1 and HVAC wired Rc, G, Y1. It's summer so I'm only using ...
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1answer
28 views

3-zone HVAC (HZ432) one zone's a/c stops working when hot in afternoon

I have a 3-zone HVAC. All 3 zones a/c worked fine until recently. Now, in the morning, before it gets too hot, all zones still work fine. But in the afternoon, when it gets hot, the a/c to zone 2 ...
3
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2answers
99 views

Thermostat White-Rodgers 1F82-261 switches to stage 2 heat for no apparent reason

I am running a central heat system that uses a heat pump as stage 1 and a gas furnace as stage 2. The thermostat used is the White-Rodgers 1F82-261 which supports 2 stages of heat. When using regular ...
1
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1answer
68 views

Connecting Common Wire to Control Board

I have a heat pump and want to add a thermostat that requires a common wire. I have read through many threads that show how to add a wire but I already have a few extra in the bundle so its not so ...
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2answers
36k views

Connecting condensate pump to sewer

My AC condensate pump currently pumps through a vinyl tube directly outside my house. However, I just replaced my broken home humidifier and realized that the previous one never had its drain properly ...
2
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1answer
86 views

Mini-split HVAC in new build?

Next few weeks I will be in the process of getting quotes for mini-split HVAC system. Curious, if anyone has gone ductless and if so, how is that working out? The house will be a a two story build(...
2
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1answer
37 views

Help with a Nest E install on a old HVAC system

Hello I am trying to replace this thermostat with a Nest E but this has proven more complicated than I thought: I plugged all the cables to the nest adapter and figured that the blue wire which wasn'...
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1answer
35 views

Can I remove this HVAC damper?

Is is possible to remove this damper? It looks like there are special kind of screws about an inch above but I'm not sure how those would come out. If I can't be remove could it be cut out? I have an ...
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1answer
29 views

Window air condition location placement question

1800 sqft + basement On main floor 2 window air conditioners 19k btu combined Upstairs 1 5k btu air condition There is 3 bedrooms upstairs, does it make sense to jist pit all the ac units upstairs ...
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0answers
30 views

Continuous fan doesn't work

I built my house in 2004 builder installed a Bryant 90+ 350mav048100fgka. From what I remember, when you selected fan to ON it was a lower blower speed. My wiring diagram identifies BFANR with a red ...
1
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1answer
117 views

Thermostat wiring orange and blue wires

I am changing thermostat but I see that I have both an orange and a blue wire in use coming from the zone board. I found the c wire hooked up at the zone board but not on the old t-stat. I assume I ...
4
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2answers
313 views

AC contactor 1 pole or 2?

I wanted to title this: Outside unit running, but thermostat is off but I'm 99% sure its the contactor unless someone here says otherwise. Thus my real question: which contactor should I buy? I typed ...
2
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1answer
335 views

Ecobee Smart Thermostat- Using Room Sensor as primary control

This is ultimately a fairly simple question about the Ecobee3 thermostat and the wireless room sensor functionality, but I'll explain my situation first. Twin home, 2 stories + finished below grade ...

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