Questions tagged [hvac]

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

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85 views

Where to connect a C wire for my smart thermostat

I am trying to connect the c wire but I'm at a crossroads of sorts. I have a dual zone so there are 2 thermostat wires come into what looks like a relay box ( see pictures) I have located the ...
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19 views

Heat Pump System

I have a heat pump system that was installed in 2006. I recently purchased the house. The filters were changed and checked prior to my purchase in March 2019. The system seems to be doing ghost runs ...
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2answers
36 views

wiring furnace blower to turn on when make up air damper is powered to open

I have a make up air damper that is opened to supply make up air to the system return air duct when the kitchen range hood is operating. There is a pressure sensor in the range hood vent duct that ...
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1answer
73 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 ...
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0answers
29 views

Zoned 2 stage heat pump system, aux heat not engaging

Homeowner here...I have a 2 stage heat pump split system with the ducting zoned for 2 zones. The units are as follows: Compressor: Goodman GSZC16 heat pump Zone control board: Honeywell HZ322 ...
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78 views

HVAC: Nest - Yet another 'C' wire question

I have a dual transformer system. At the AC/Blower unit, there are 'R_c', 'Y' and 'G' wires; there's 0VAC between the 'Y' and 'G' wires, and each shows 27VAC to the 'R_c' wire. At the boiler, there ...
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2answers
55 views

Do these swamp cooler pads need replacement or cleaned?

I know these pads are at least 4 summers old, but not sure how old exactly. As I was shutting the swamp cooler down for the winter, I saw that they seemed really dirty. The white material flakes of ...
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3answers
70 views

How to install a timer next to thermostat to control/limit the length of time the thermostat operates?

What if you want to put the thermostat pre-set at 74 degrees in a clear wall mount tamper-proof enclosure and install a 6 hour timer next to it so the knuckleheads don’t leave the a/c on when they ...
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0answers
39 views

Hot Surface Ignitor does not glow

I bought Ecobee Lite thermostat last summer and connected it properly to the furnace using C wire. Air conditioner worked without any issues. But no luck with the heat. When the furnace gets the call ...
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2answers
60 views

Can I bury insulated flex duct in blown insulation in the attic?

I've heard mixed information on this. I am replacing all my old ducting with new r6 flex duct. Continuous runs with no leaks. Some recommend suspending it above the blown cellulose insulation, but I'...
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10 views

Purged Air from Heat Zone, Still Hear Rushing Water

I have a three zone hydronic heating system. The radiators do not have bleeders but there is one on the air scoop by the boiler. I heard rushing water in one of the zones so I replaced the auto vent ...
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0answers
18 views

Ecobee installation with a air circulation unit?

I recently had a technician install a new ecobee thermostat, but he disconnected the control board from on top of the furnace. he bypassed the board to install the thermostat. Is there a way to ...
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4answers
104 views

What is this rubber tubing called?

What is this rubber looking elbow here called and where can it be purchased? It's the black part that is fastened to the 3/4" pvc using hose clamps. For some context, this is a condensate drain on an ...
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0answers
15 views

Is it proper to install a ceiling vent for HVAC if it blows on the windows in the “open” position, but not in the “closed” position?

I understand that HVAC vents should be aimed at the windows (ceiling and floor vents) to maintain the target ambient temperature and avoid extremes in a room. In the case of a residence in a humid ...
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0answers
17 views

Boiler leaking from hy-vent with pressure drop

Today was a warm day so I turned off our hot water boiler. About two hours later, I noticed a good amount of water had leaked. I assume it was from the hy-vent because it looked like it had dripped ...
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1answer
26 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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1answer
34 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
50 views

Can an 8" rigid duct be split into two 6“ flex ducts

I'm trying to finish an en-suite bed/bath that currently has a capped 8" rigid duct coming off the main trunk. What is the proper method to supply air to both the bedroom and bathroom? The bedroom is ...
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1answer
40 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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1answer
56 views

I have 5 natural gas appliances in my basement, can I replace just one with a power vented exhaust?

I live in a 3-family house. I have 3 chimneys and want to eventually remove one of them. One of the furnaces in the basement is gravity venting through the chimney to be removed. Now I need to replace ...
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0answers
13 views

PTAC heat troubleshooting

I own a condo with two Islandaire EZ09EBMXH8N10AA PTACs, one of which is acting weird. They have self-contained A/C mechanisms, but the rooms are heated by pumping hot water from the building through ...
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1answer
50 views

is the 24v transformer output ~27v normal?

i found my carrier 58pha090-016 furnace had no flame with the igniter on, and exhaust fan running, etc. it kept trying 3 times then stop. i reset the power switch of the whole system, the same cycle ...
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2answers
47 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
98 views

Can I manually switch off booster fans that are coupled with HVAC blower?

Could not get upstairs in 1900 craftsman bungalow cooled with HVAC system until the contractor inserted a booster fan in each of the two ducts. Fans are coupled to the blower of the HVAC. Now in fall ...
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1answer
35 views

How to add a C wire to an old Lennox attic furnace GS810-105N

I bought a smart thermostat for my house in hopes of cutting some bills a little. I read up on them, I thought, thoroughly and figured I could handle the task. However, upon climbing up in the attic ...
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2answers
28 views

Can I hook up the Glas WiFi Thermostat with oil furnace in basement and central ac in attic

I have an oil furnace in my basement with only 3 wires for the thermostat only 2 being used. I just installed central air in my house but air handler is in the attic with 5 wires for the thermostat 4 ...
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1answer
40 views

Honeywell TH6320R1004 Wireless Thermostat with Two Transformers

I have a Honeywell TH6320R1004 and am trying to set it up to work with a second transformer (just added a Taco ZVC403 to an existing Taco SR503). The second transformer was needed to power the zone ...
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0answers
37 views

Spray foam vs injection in garage ceiling with bedrooms above?

My new home has 2 bedrooms and a bathroom over the garage. Per the builder, there is a R30 insulation (so I guess about 9" batt, but haven't drilled in yet to check). This is clearly not working as ...
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2answers
85 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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1answer
50 views

I need a signal when my furnace fan turns on

I want to install a motorized fresh air damper that opens when my furnace fan comes on. Is there a place where I can pull this signal off of the furnace board? Thanks!
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1answer
49 views

How to light the pilot for an old Gas Heater

We have moved in to a new home (new for us!) and we noticed that there was no heat coming from the base board. I tried to read the instructions on the Gas Heater in the basement and it talks about the ...
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0answers
28 views

New thermostat turns fan off when set to on, never turns off on auto

My oil heat furnace was functioning normally on an old mercury switch thermostat, but I wanted to replace it with a programmable Honeywell 5+2 one. There were Y, W, G, R, and B wires screwed in on the ...
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1answer
45 views

Need help with weird (?) wiring to thermostat and condensate pump

I've searched a lot and can't quite find what how to solve this one. I installed an ecobee smart thermostat, which didn't work with 5 wire connection so I switched to their PEK module with only 4 ...
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3answers
88 views

What could be the sources of humidity that build up in a house in an arid environment? Outside RH: 10%; Inside RH: 40% +

We open our window at night at the temps get down to 70F @20% RH. The temp in the house drops to 75F and the RH is 33%. We close our windows when we go to work. When mid day comes, outside, the ...
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0answers
30 views

I am installing a Honeywell Pro 2000

So, I have the green, white, blue and red wires coming in, but DO NOT have a yellow. There is a brown. I do have both regular gas heat, and AC. What terminal should the brown wire go? And should the ...
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4answers
106 views

AC air feels unnatural

I have a general question concerning air condition systems. Basically to me the air coming out of the AC unit doesn't feel natural. I've experienced different types of AC units, from small to quite ...
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1answer
45 views

Secondary C Terminal on Furnace Circuit Board?

I was trying to install an Ecobee thermostat, and there was no C wire installed. When I went to install the power extender kit, I saw the standard C wire terminal was broken out of the black plastic ...
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0answers
21 views

Lennox G51MP shutting down with Primary/secondary switch fault

I have Lennox G51MP-48c-090-06 ~14yrs old, starting up for first time this season. It is throwing error code: Primary or secondary limit switch open. Unit shows normal operation when powered up and ...
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0answers
20 views

Geothermal system that will not always cycle down at set point

I have a Geothermal HVAC system (no outside unit). Occasionally it will continue to run well past the set point and not cycle off. It may do this once in a week or once in a few weeks. If I turn the ...
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1answer
41 views

Ducted A/C system under powered

I recently replaced carpets with tiles in my apartment, and in the process generated an incredible amount of dust. All this dust was sucked into my A/C ducting, and the filters in the return were ...
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0answers
35 views

The burner on my Lennox G40uh furnace will not ignite

I have a Lennox G40 series furnace and the gas valve will not open. After it does the preliminary start up I get 27V to the gas valve, but only for about half a second. Periodically the LEDs will ...
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1answer
76 views

Where should I connect my C-wire on my old Goodman unit (GMP075-4 rev 13)

I want see if someone help me on hooking up this new Honeywell thermostat with Wifi I just purchased. I have an old ac unit and I only have 3 connections to my circuit board which does not have an ...
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0answers
61 views

No power to isolator switch

I recently moved into a repossessed flat and the electrics were a bit of a mess. Sockets, switches, etc. hanging off walls but it has since all been made safe/good by an electrician. The only thing ...
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1answer
22 views

How should I insulate garage ductwork when no gap exists between ductwork and ceiling?

I currently have uninsulated HVAC ductwork running the width of my garage. There's no gap between the ducts and the plaster ceiling above it. There's also very little clearance between the ducts and ...
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2answers
58 views

Going through condensate pumps every 2-3 years

I am about to buy my 5th condensate pump in 12 years. HE furnace or 2.5T A/C run 10-11 months out of the year here. Humidifier attached but not in use. I have a 7.5' rise, 20' horizontal span, then 8'...
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1answer
26 views

Heater tripping off outside breaker

I have a Payne AC/Heat unit outside my mobile home. When I turn the thermostat to heat, it runs and blows air for about 10 seconds and then trips the outside breaker at the meter... From the meter I ...
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2answers
39 views

Do two-stage compressors offer both two-stage heating *and* cooling?

I received a quote for a two-stage heat pump (model HCH636GKA). I have the following questions: Does a "two-stage heat pump" imply a two-stage compressor? Does a two-stage compressor guarantee two-...
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2answers
62 views

Insulating a Wall Against Unconditioned Attic Space

I'm looking for help in insulating my 1950s San Diego house. A second story was added in the 70s and a gas furnace + A/C was added about 10 years ago in the unconditioned space above the downstairs ...
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0answers
23 views

Eliminate Humidistat

I have an old Honeywell H8808 humidistat and a Pro 1 model T721 thermostat and the problem is that when the humidistat is turned down far enough to kick the system on it will come down to set ...
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0answers
31 views

Installing HVAC return in mold-infested room

We're in the process of reducting our house for a central HVAC system. We have an insulated "cold room" in the basement that had an outbreak of green mold in the past, probably from an old fridge but ...