Questions tagged [hvac]

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

Filter by
Sorted by
Tagged with
2
votes
0answers
35 views

How to wire Aprilaire 600a to older furnace

I need help wiring an Aprilaire 600a humidifier yo my older oil furnace (from 1998). I thought I had followed the wiring instructions properly, but the digital humidistat is giving me an error code (...
1
vote
0answers
26 views

Furnace sometimes does not start

I have a 5 year old Broan furnace model M7RL 072A AW downflow condensing gas furnace. Here's the furnace startup sequence: pump runs ignitor glows hear the click of the gas valve opening fires up ...
0
votes
2answers
26 views

A/C compressor connection to the house not sealed anymore. How do I fix it?

The A/C compressor that sits outside our home had a sealed connection to the house (pretty new, 3 years old), and it seems a "gasket" was created with silicone. However, the soil underneath the ...
0
votes
1answer
59 views

Intermittent sewage smell from air ducts

My home is two stories, 5100 sq feet, and was built in 1990. I have a septic system, radon mitigation, and central forced air. This has gone on for two winters now, but not before that. The second ...
0
votes
0answers
30 views

I changed my thermostat and now my outside unit won’t turn on

I have a trane heat pump and A/C unit outside and a trane unit inside. I had to replace my thermostat because the one I had, didn’t have emergency heat option on it. I turned off the breaker and ...
1
vote
1answer
116 views

Low Voltage C-Wire at Thermostat

Looking to install an ecobee thermostat and decided to measure my common wire before unhooking anything. I tested the R, C wires and see they are only reading 14v, whereas R,Y, and R,W are reading 28v....
1
vote
1answer
309 views

Air conditioner locating c wire on old unit

Hi guys I'm trying to figure out I'm using a dual heat and cool thermostat so i decided to get myself a smart thermostat and want to connect both thermostats into 1 but I'm having trouble location the ...
1
vote
1answer
135 views

Just put calcium carbonate rocks in my condensate water pump or buy a whole condensate kit?

Can I just put some calcium carbonate rocks in my Beckett water pump (see photo of pump, below) to neutralize the HVAC condensate, or do I have to spring for a whole assembly, like this (The refills ...
0
votes
1answer
52 views

how to test to see if a humidistat temperature sensor is working

I have an April Air 600 humidistat with an outside temperature sensor. What is the procedure to test a temperature sensor to see if it is working.
1
vote
1answer
19 views

Does manual operation of a Taco 570 series zone valve operate the boiler?

I have a home with multiple zones with the valves mentioned in the question. The documentation (http://www.taco-hvac.com/uploads/FileLibrary/100-3.pdf) isn't clear about whether contact 3 is ...
2
votes
1answer
74 views

Wiring HVAC for smart thermostat

I'd like to install a smart thermostat in place of my old mercury coil thermostat. The old thermostat controls both heat and AC - it uses only 4 wires, the new clearly requires 5. Wiring to the ...
0
votes
0answers
32 views

Nest Thermostats: Balancing temperatures between zones

So, I'm wondering if there's a way that I can program my Nest thermostats to help moderate temperature disparities between my first and second floors. Here's the situation: I have forced air from a ...
3
votes
1answer
321 views

No C Wire Nest Thermostat

I just installed a nest thermostat. The previous thermostat did not have a C wire attached. It G, RC, (RH Jumper), Y and W. When I hooked up the nest thermostat it was short cycling the blower fan ...
1
vote
1answer
127 views

Is a pulse width modulating thermostat compatible with a W2 auxillary heating (Nest compatibility question)

I have the wiring configuration for a RHEEM thermostat Pictured Below. On it, there is a "V" wiring connection which according to the manufacturer is for "Pulsed width modulation" type heating. On the ...
7
votes
1answer
576 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 ...
0
votes
1answer
42 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 ...
1
vote
0answers
38 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 ...
0
votes
0answers
126 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 ...
2
votes
2answers
72 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 ...
0
votes
0answers
24 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 ...
1
vote
0answers
44 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 ...
0
votes
1answer
16 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 ...
1
vote
2answers
57 views

How large should a return HVAC duct be relative to the size of the supply?

I have a 4 ton American Standard electric forced air furnace (with no A/C - just heat) with a single speed blower motor, circa 2006. My supply main trunk is 12"x20". The return side of the system ...
0
votes
1answer
59 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 ...
2
votes
0answers
18 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 ...
0
votes
2answers
42 views

Gas Forced Hot Air seems to be blowing extremely hot air

Gas forced hot air. The floor registers are hot to the touch after 6 minutes heat running, if left hand on register would burn quickly. Don't remember it being this hot before.
2
votes
2answers
69 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 ...
1
vote
1answer
33 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 ...
1
vote
1answer
39 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 ...
2
votes
1answer
87 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'...
0
votes
1answer
87 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 ...
0
votes
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 ...
0
votes
2answers
200 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 ...
0
votes
0answers
20 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 ...
2
votes
2answers
261 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 ...
1
vote
1answer
538 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 ...
0
votes
0answers
61 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 ...
0
votes
0answers
92 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 ...
1
vote
2answers
71 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 ...
0
votes
3answers
168 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 ...
0
votes
0answers
43 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 ...
1
vote
2answers
218 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'...
0
votes
0answers
11 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 ...
0
votes
0answers
19 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 ...
0
votes
4answers
109 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 ...
0
votes
0answers
58 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 ...
0
votes
0answers
41 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 ...
0
votes
2answers
156 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 ...
0
votes
1answer
53 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 ...
1
vote
1answer
283 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 ...

1
4 5
6
7 8
42