Questions tagged [hvac]

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

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2
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1answer
46 views

Effective Blower Speed

Looking to build a DIY conveyor belt powered by a furnace blower motor that I have kicking around using a series of pulleys to significantly step down the speed. My 3 speed Century DL1076 has an rpm ...
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1answer
199 views

How to accurately measure CFM with Digital Anemometer and Duct

We bought a digital anemometer to check the CFM of various fans we have on hand. My husband designed and 3D Printed this duct that securely mounts fans on to the anemometer for accurate readings, ...
0
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1answer
38 views

In a multi-zone mini-split setup, how do you heat heat rooms without an evaporator?

I recently asked for recommendations for multi-zone heating in a small home (intended for college students). The responses overwhelmingly recommended multi-zone mini split systems. I fully agree, my ...
6
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3answers
259 views

Why don't HVAC service people want to use outdoor temperature sensors to increase efficiency?

Here in central Virginia, most houses use heat pumps with electric auxiliary heat. I have inquired with several different contractors about installing outdoor thermostats on my units to 1) disable ...
1
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2answers
231 views

Plaster Walls Cracking above air vents

My house was built in the 1950's and have plaster walls. I am in the process of repainting and have noticed that the plaster above the baseboard air vents has cracked above almost every vent in the ...
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0answers
22 views

wiring up new air mover

I have a central air system and my squirrel cage fan inside the house started humming and then stopped. I figured it was the capacitor but I found a whole new fan for just a little more. Im having ...
1
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1answer
246 views

Sticky black liquid coming from Furnace / AC Unit

I have this sticky black liquid slowly leaking from my gas furnace / ac unit. I called an HVAC repairman and he wasn’t sure what it was. He said he thinks it’s an old drip pan made of tar (not sure ...
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0answers
28 views

Can i use my A/C with the front panel/lid just a little bit open?

Using my AC with the front panel/lid just a little bit open prevents it from doing a horrendous sound. Is it ok to use it like that? Thanks!
1
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3answers
65 views

How can I seal up this gap on top to make it smellproof

As you can see, at the top of my door there's an open panel with fixed glass panes attached to allow airflow through. How should I best seal that giant gap up so that I can install air-conditioning in ...
2
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1answer
134 views

Brand new AC unit makes whooshing sound and air “chokes”

My brand new AC recently started making a whooshing noise. It sounds kind of like a sudden gust of wind, but it repeats every few seconds. Another way I can think of to describe it: imagine a PC ...
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2answers
62 views

Should range hood ducting be installed before cabinetry?

When should I install range hood ducting? I am putting in new cabinets. The kitchen has never been vented outside before. The duct work needs to be installed above the cabinets. What needs to be done ...
0
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1answer
28 views

Air Conditioning Thermostat Wiring

A set of three air-conditioners cool a storage building in an American sub-tropical environment. There is no heat: AC only. Cooling is signaled by switching the RED (24V) to: Yellow wire (cooling ...
2
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1answer
36 views

Question about adding an HVAC circuit

So am I reading this right? I can use a 30 amp breaker and fused disconnect and thus us a 10ga wire to build this circuit?
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1answer
65 views

What kind and size of AC do I need for an enclosed garage workshop?

I am building a workshop / equipment room (computer workbench, hosting servers and network equipment) in my garage. The room will be fully insulated 8'x 12'. Since I'm running some heat producing ...
3
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1answer
67 views

Range hood impeller slipping on rotor shaft

My range hood has a motor with an impeller on it. The impeller is attached to the rotor shaft by a nut that threads onto the impeller's... bushing I guess it's called, which is slotted, so that as the ...
0
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2answers
55 views

How can I improve recovery time of my hot water baseboard system?

I've just purchased a 15-year old house heated with a gas boiler and multiple baseboard zones controlled with zone valves. The house is built to be energy efficient, and I have no doubt that there'...
1
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3answers
205 views

Will an AC compressor work upside down?

If an AC system is designed to keep liquid refrigerant out of the compressor, will the compressor be ok if installed upside down? It should only be dealing with gaseous refrigerant, but I don't know ...
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1answer
50 views

Forced Hot Air temp out of vents seems too hot

Vents close to heater the temp is up to 130 F. Others further away are less than 100. 130 F just seems so hot that the metal register would burn your hand if you left it touching. The heater has to ...
1
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1answer
216 views

Rth5160d1003 New Thermostat wiring from Older 7 Wire Setup o & b wires?

I need help with wiring up the new thermostat. I have a Gas furnace heat with heat pump. Goodman Units. The old thermostat G=GREEN C=BLUE Y=YELLOW R=RED O=ORANGE b=BLACK E=WHITE. The new thermostat ...
2
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1answer
52 views

Hot water heating recommendation

I'm looking for a recommendation on the best course to update our hot water heating system.Some background: When we moved into our upstate NY, 2200 sq. ft. home five years ago, the home was heated ...
0
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1answer
81 views

How much does it cost to move a furnace from the attic down to the first floor? [closed]

I have a one story slab home and when I moved in two years ago I had to replace the whole unit. I wasn't even thinking about having them put the unit on the first floor. There is a closet(which is a ...
4
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2answers
1k views

Ok to reduce size of return vent grill?

In my living room I had two metal return vents which are both 14 x 12 = 168 square inches, not including the vent slats which are narrow. As part of a renovation one of those vents is being replaced ...
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0answers
23 views

Had a slow leak into bathroom ceiling/wall but humidity was low and controlled in that area for 2 weeks. What is mold Risk?

Installed a new furnace humidifier to replace a non-working(probably never used) vintage humidifier 14 days ago in a new place I bought. Confirmed a small gap let a slow drip from condensation that ...
1
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1answer
50 views

Why does my new furnace vibrate and smell like burnt oil?

I just had a new Furnace installed (Goodman GCES960804CN) along with an evap coil (CE48D44210L004) and AC condenser (GSX140481) on Jan. 9th 2020 by professionals. Everything is new equipment and the ...
0
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1answer
27 views

Extend AC hose and install an additional fan

I have an AC in my dorm which works great. During summer I connect the AC via a fitting to the window to cool the room. Due to restructuring of my chamber I want to move the AC in one of the corners ...
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0answers
25 views

Attic Fan coil short cycles in heat mode

My attic fan coil unit (MBX-HW) fan will short cycle in heat mode. On for 20sec off for 20sec. Worked fine in cool mode last Summer. Replaced the filter, thermostat replaced 2 years ago. The heat ...
1
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1answer
86 views

One Furnace, Dual Zones — Install Sensi on each?

Just bought a new (<6 years old) house and it's two stories, but only has a single furnace in the attic and a single condenser outside. However, there are two thermostats that work (semi) ...
4
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1answer
462 views

What is this component wired into a bench grinder motor?

I'm refurbishing an old Black & Decker 6" bench grinder. It's got a power cord, an On/Off switch, and an A/C motor. The motor doesn't energize, even with a manual start, and I'd like to check the ...
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0answers
11 views

Heating system cycling

My heating system is power cycling because the heat exhaust temperature sensor is tripping. When I turn the intake gas valve closed a bit, the system will stay on for longer but it's still does some ...
0
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0answers
32 views

Keep Purging Heat Every Two Weeks

I have a three zone hydronic heating system. For some reason this year I have had to purge my system every 2-3 weeks because I keep getting air in the pipes. I know this because I hear water start to ...
1
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2answers
966 views

One of two Nest Thermostats won't run Fan Only, fan runs with heat though

We've got two Nest Learning Thermostats (3rd Gen) running two separate heating and cooling units in an office. They both work fine for heating and cooling, with one exception: one unit will not turn ...
0
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3answers
453 views

(SOLVED) What is a whining, high pitch sound coming from my furnace when heat kicks in

EDIT: SOLVED. IT WAS THE FLEX CONNECTOR. THANKS EVERYONE. My gas furnace makes a high-pitched whining sound when the burners turn on (when I can see fire). A repair man came and told me it may be that ...
0
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1answer
29 views

Amana furnace discharge vent seems clogged

My furnace starts out very slowly trying to put out hot air maybe 2 to 3 hours. I think maybe my discharge vent may be clogged but its on a slippery roof and about 30 foot of PVC so how would I clean ...
0
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1answer
139 views

Where should my humidistat on my whole house humidifier be located

I have a Trion cm200 installed on my air handler up in the attic of my house. Toward the end of 2018 I had an entire electric system installed in my house (duct work, air handler and outside ...
7
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5answers
3k views

Does a thermostat need to be connected to the fuse box? My builder says no?

I just purchased a home, and was in the process of replacing the thermostats with Nests. I flipped off all the circuits in the fuse box, and the thermostat on the first floor powered off. However, the ...
2
votes
4answers
350 views

Considerations for installing a high efficiency furnace in my attic?

I live in Upstate NY and in the winter it gets below 0° F. I currently have baseboard water heating throughout my home. Prior to this I believe there was a gravity furnace which supplied the house ...
0
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1answer
28 views

Tempstar 2 stage furnace restarting every 7 minutes - not going into high

I have a tempstar 9MPT model based furnace. Also sold under a number of other brands - comfort air, etc. It is a two stage heating with a PSC motor high efficiency furnace. After about 7 minutes of ...
2
votes
3answers
79 views

Re-route HVAC around basement window?

Working on my basement and this part of the HVAC covers the corner of that window. Can it be re-routed or reconfigured to fit around the window better? It connects to the kitchen upstairs.
0
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2answers
58 views

What should I do with the airflow in a sealed off conditioned crawlspace

First and foremost thanks ahead of time for everyone's help :) I am in the process of finishing my basement and had some questions/concerns about "what to do with the air" in my crawlspace. ...
1
vote
1answer
26 views

HVAC Furnace - Adding C Wire to Older Wiring Style

Hello! Trying to add a smart thermostat to an old system (currently running a mercury thermostat on it). There is an extra wire (orange) which you can see both inside the thermostat and also in the ...
1
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0answers
73 views

Thermostats with or without variable temperature differential (swing)

I am looking at replacing my thermostat, and don't really need or want one with geosync. I am thinking of the honeywell RTH9585wf. Currently I have a lux that is not wifi but programmable. It ...
2
votes
2answers
83 views

Tempstar (ICP) furnace short cycle (runs 10 -15 minutes) then repeats

I have a tempstar (ICP) furnace put in when the house builder built the house. Model is N9MPD075F12A2. Installed late 2009. This problem only happens with the furnace not the AC. When calling for ...
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2answers
41 views

HVAC Preventative Maintenance

Is it necessary to add bleach or vinegar monthly to HVAC line when system is not in use, mainly when air conditioning and heat are not necessary.
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0answers
23 views

AC compressor runs with heat on. NOT a heat pump

My AC compressor recently started running whenever the heat kicks on. It is not a heat pump. The compressor is a Nordyne fs3ba-036ka. I haven't done anything to the system aside from changing filters ...
2
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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 (...
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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
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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
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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
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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
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1answer
114 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....

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