Questions tagged [hvac]

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

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1answer
27 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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0answers
22 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, ...
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1answer
351 views

Furnace sometimes fails to ignite, despite extensive replacement of parts

I posted a questions months ago, that it randomly decides to not start. Random as in work for a few hours, a few days, a few weeks....whenever it feels like not working, random. I went and replaced ...
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1answer
30 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 ...
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6answers
5k views

Would solar panels save money with electric baseboard heat?

My house has electric heat, built in 1969. How can I save $. Are solar panels the way to go, or is there something better out there? I'm not sure which way to go . My electric bill is nuts. I have a ...
5
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0answers
73 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 ...
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1answer
39 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 ...
1
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1answer
56 views

Why is my HI HEAT terminal causing blower to run non-stop?

I am trying to troubleshoot what is causing my blower to run non stop (the condenser (outside unit) comes on only when cool is required). There is no issue with cooling the house. I read through all ...
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1answer
73 views

Furnace Short Cycling

My furnace is short-cycling. I've tried the following: replaced the flame sensor Shorted the thermostat heat demand signal Checked the blower capacitor Checked the air intake filter Checked the ...
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2answers
111 views

Why is the second condensation drain on my central air unit active all of a sudden?

The largest of my three central air units in the attic has two drip condensation pipes coming out of the evaporator coil box (not one that had an overflow opening that drips into the overflow pan). It ...
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1answer
36 views

AC Fan/blower not shutting

My AC unit is working just fine and shuts down at/below set temperature. However, the AC fan keeps running all the time even in auto mode. The only way I can shut down the AC fan is to power-down my ...
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1answer
2k views

How can I properly drain heatpump condensate?

I have a heat pump in the attic That drains to the ground outside two floors below. I naively added a hose fitting so I could redirect the water where I wanted it, slightly up hill. This created a ...
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1answer
88 views

Sealing a closet door that has a gas fired water heater in it

Does anyone know how to make a self sealing door? There's a bedroom in my basement, and it has a door in there that allows you access into the HVAC room (which can be entered from another door in ...
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2answers
100 views

TRANE XE70 GAS FURNACE - HSI only works once

My TRANE XE70 Gas Heater ..... HSI will glow hot once and heater works fine but then doesn't work anymore on the Thermostat cycle. I've replaced Flame Sensor and HSI Module. My White-Rodgers Control ...
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1answer
201 views

How to improve heating/AC flow in second floor?

We moved into our house about a year ago and the second floor in my house never get enough heat in winter or cold AC in the summer. Our first floor can be a 72F deg while our upstair stays at nearly ...
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2answers
48 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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1answer
95 views

Why doesn't my home cool down when the air conditioners run?

I have two HVAC systems (2x condenser outside, 2x evap in). I just got them repaired after they started leaking two years ago (have not used it for two years). Both AC's came with the house, and I ...
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1answer
47 views

Replacing A/C thermostat

I think that my mother has a bad thermostat. When the A/C is turned on, the furnace blower works but not the outside unit. However, when I press the contact switch (outside), both the compressor and ...
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1answer
34 views

Blower Motor Heat and Cool Control Board

I’m an electrician by trade but i have a friend who needed his blower motor replaced. The parts store sold him a motor but it only has one hot leg. The control board has a hot for cooling and a hot ...
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2answers
75 views

HVAC AC Capacitor Replacement

I have a Carrier Infinity Series AC Unit (Model #: 24ANA748A0030020 or 24ANA748A00300); its capacitor needs replacement. I live in Chicago; so VAC is 120 x 2. Current Capacitor Specification: ...
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2answers
64 views

Mini Split Condenser wall mount on wood exterior wall

We have a wood-frame house with 2x4 studs and half-inch plywood exterior walls. What is the generally accepted best practices for mounting a 80lb mini split condenser on a wall bracket to this type of ...
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1answer
108 views

Old thermostat to Hive thermostat

My wife decided we needed a smart thermostat... which means I need to install said thermostat... Currently a Bryant Evolution series is mounted. She purchased the Hive with Hub when it was on sale. ...
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1answer
2k views

Add a c-wire to 25+ year old Rheem furnace

I've looked at just about every post on adding a C-wire to power a WiFi thermostat but remain uncertain on how to proceed. The current installation on a Rheem RGAC-080A is two wire as here: XFMR - ...
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0answers
24 views

A/C and furnace [closed]

I am going to have a new gas furnace and A/C installed I have checked and found out that Goodman Equipment is popular in my area. where can I find reviews on this product. Does anyone have experience ...
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1answer
254 views

Can I fix damaged AC line insulation with tape?

The foam insulation around the suction line on my ac has deteriorated, so I covered it completely with tape. Was this an OK thing to do. Am I harming anything? I have not run my AC since I did this.
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0answers
19 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 ...
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2answers
224 views

Installing Nest on Viconics P117 Board

I couldn't find any help on forums or websites if anyone may have tried to install Nest by replacing old Viconics P117 Board and E117 thermostat. I have an Electric Furnace and Heat Pump configuration....
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1answer
22 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 ...
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1answer
56 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 ...
4
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3answers
11k views

Why does the pilot light go out when the furnace is running?

Every time the furnace fires up, it blows out the pilot light. Sometimes it will run a full cycle and blow out when it shuts down, and sometimes it will blow out about a minute into the cycle. We ...
3
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3answers
739 views

Why doesn't AC equipment come with dehumidifier only option?

Every AC unit dehumidifies when cooling is on. I'm just wondering why dehumidification only is not an option, as is in standalone dehumidifiers? E.g. my basement stays pretty cool even in the summer ...
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1answer
52 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 ...
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1answer
87 views

How can I prevent makeup air vents from exhausting conditioned air?

The utility room has two 8-10 inch ducts running to it from the exterior of the home. There are also three fireplaces in the home, and we have noticed that occasionally the house smells like smoke, ...
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0answers
27 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!
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3answers
63 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 ...
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1answer
50 views

a/c condensation line not draining

I have a unit that is installed in the attic and is about 2 years old. For the first year everything was fine and then one day it wouldn’t run. So I hooked up the shopvac and sucked the condensation ...
2
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1answer
55 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 ...
4
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1answer
261 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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1answer
123 views

Which humidistat terminals should I use for my humidifier?

My Carrier furnace does not have a humidifier connection on the control panel. I have two wires from the humidistat. Do I use W-C or R-C connections for a normal operation?
0
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1answer
58 views

C wire in wireless Thermostat Transofrmer question

I have a rheem handler with a 46-23115-02 transformer. I do not have a C-wire connection that I can see. I have a 5 wire cable... so I do have a blue wire available that I can connect as the common ...
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2answers
45 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 ...
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2answers
146 views

Heat pump not working after rain

A couple weeks ago, I had a Goodman 3 ton heat pump split system put in. At 5pm hours today, I was outside near the heat pump and noticed that it was functioning properly. At about 6pm, there was a ...
1
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1answer
81 views

2 Air Filters in Air Conditioning Unit

My air conditioning system has a 2-layered (each 1") filter holder, definitely made for two filters. My idea, to improve the filter life and have the least air flow restriction, is to have the initial ...
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2answers
993 views

How do I know when evaporative/swamp cooler pads should be replaced?

This is my first experience with an evaporative cooler because we just moved into our house. I have no idea how long these pads have been it he cooler. We never noticed any smells come from the cooler ...
0
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1answer
58 views

Second Floor Bedroom Little HVAC

I have one bedroom upstairs 2nd level that virtually gets no air or heat. The other 2 bedrooms have medium force. For the one bedroom in question, checking with your hand, you feel very little and I ...
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1answer
41 views

HVAC Adding a Common

Got a new Honeywell WiFi thermostat and need to add a common. Currently the 3 common wires per the diagram (BL, BK, GY) are wired to one side of the AC Unit. Is there an issue if I piggy back a ...
2
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2answers
7k views

Wifi Thermostat to Reznor Garage Heater. No “C” wire connection on terminal strip

I just had a 75000 btu Reznor UDAP garage heater installed. Can I run a "C" wire for a smart thermostat if I don't have a C connection on the terminal strip? There is a C connection on the circuit ...
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1answer
40 views

Mold at Air Return

I have 2 HVAC units, one for upstairs and one for downstairs. When I went to change my air filter for the downstairs unit I noticed some mold in the return duct. This is a large duct that travels ...
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1answer
19 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 ...
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1answer
78 views

Bad Limit Switch?

My Nest thermostat is not working and it says the red wire is not getting power. The gas company man poked around the furnace and thinks it is a bad limit switch. Question: can a bad limit switch stop ...

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