Questions tagged [hvac]

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

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1answer
34 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 ...
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2answers
39 views

Gas heater fan noise

I have a CF653C-H Cozy wall gas heater ..The fan runs fine , except when it shuts down , it clicks 15 to 20 times before stopping . At least I am guessing its the fan, could also be the motor ..But ...
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2answers
265 views

A/C unit cycles on and off during cooling phase

My outside compressor / condenser is cycling on and off, even though the thermostat is calling for A/C. The blower in the house still runs, and the thermostat is working properly. (I opened up the ...
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3answers
53 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
322 views

Converting I+ I- thermostat to 'standard' wiring

I've been replacing my thermostats with the RadioThermostat CT50, which reports to my home-brew home control/alarm system. I have a 3-year old AireEase 4-ton unit in the shop that has a Comfort Sync ...
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1answer
18 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 metal, registrar would burn your hand if you left it touching. Heater has to run over 7 ...
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1answer
52 views

burners out of sequence with blower motor

I have a Bryant furnace plus 90 model #398AAW036060D. I just changed the blower motor. In the last five years I've changed the main board, inducer board, pressure switch, and cleaned the igniter the ...
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2answers
95 views

Fill leakage gaps/holes in AC condenser cabinet?

Is the condenser unit engineered to be optimal with a leaky cabinet? Any reason not to pimp it up, blocking air leaks? While I was troubleshooting my 12+ yo Carrier AC this morning, I vacuumed out ...
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1answer
70 views

A/C blower does not work after a power surge

My outside unit works but my inside unit does nit turn on, its a bryant a/c system. On the unit it says the circuit board is built into the blower motor. The transformer buzzes. Can I replace the ...
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1answer
39 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 ...
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1answer
55 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 ...
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1answer
21 views

Is there a small ductless condenser to fit in A/C sleeve?

I own a 350ft studio co-op unit which currently has an old AC unit and two electric baseboards for heat. I was thinking it would be nice if I had a single high hat in the middle of the room connected ...
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2answers
876 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 ...
4
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1answer
187 views

What is this mysterious filter and purpose?

Behind the regular HVAC air filter and next to the duct, there is a filter area with some rough filter covering an additional smaller duct. Does anyone have any idea what it is and its purpose?
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1answer
746 views

Need help adding a C wire for a wifi thermostat

With the increasing popularity of wifi thermostats I know this question has been asked many times, however I'll ask it again fr my specific situation. How do I add a "C" wire to my existing air ...
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2answers
337 views

Problem with condensation on HVAC ducts inside house

I'm having a pretty serious problem. There is an old sheet metal HVAC duct in my home that is getting condensation that is dripping onto the ceiling of a pantry. This duct is completely internal to ...
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0answers
19 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 ...
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1answer
59 views

Heat pump always turns on with fan!

If I turn my fan on on my thermostats the heat pump turns on with heat or cool setting There is a jumper wired from green to w1(the heat pump) If I move the jumper to r (24v) and g and turn on the ...
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4answers
3k views

Why does my furnace turn off after a few minutes, then re-ignite?

I have a Goodman 80% furnace in my barn dated 1999 it runs for about 5-10 minutes then flame kicks off for about 2 minutes and re-lights. It does not go into lockout mode (keeps cycling this way). ...
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1answer
927 views

Want to add a WIFI thermostat, but no 'C' wire… only 2 wires to each thermo

i have a 5 zone radiant floor, oil fired heating system. Each thermostat only has 2 wires running to it. i have a TACO SR506 switching relay that receives the wires from each thermostat and controls ...
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2answers
4k views

How should I connect my humidifier to HUM terminals?

Had my system replaced last summer. When they hooked up the humidifier, they just went to the transformer output for power. Now anytime humidity is below the set point, the water runs even if the ...
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1answer
20 views

Need some answers to New Gas Furnace and AC Condenser Unit installed recently

i could use some Help to a problem i am having: I just had a new Furnace installed ( Goodman GCES960804CN ) along with ( Evap Coil CE48D44210L004 ) and ( AC Condenser GSX140481 ) on Jan. 9th 2020 ...
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1answer
63 views

Is my furnace limit switch tripping due to a flawed coil installation?

I have two furnaces - one for each floor. One of the furnaces that were replaced within a year keeps blowing cold air randomly. I would reset it by turning the main power switch off/on and then it ...
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0answers
20 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 ...
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1answer
63 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 ...
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1answer
19 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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2answers
206 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
23 views

Furnace burners shut off an hour after running?

Older furance that wasnt holding pressure. Leak was found and gas valve replaced. Gas is on. Fired it up yesterday for the 1st time. The house has been vacant awhile. We had no problem. Came ...
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2answers
45 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. In my ...
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1answer
35 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) ...
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1answer
452 views

How do you block cold air flow from an AC vent without blocking the vent?

From what I've read it seems that it's a bad idea to cover central air conditioning vents. So what can I do to control the cold air coming through one vent without lowering the AC for the rest of the ...
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1answer
697 views

Wiring a C (common) wire to a Triangle Tube Prestige Excellence 110?

Wiring noob here. Can someone give me step-by-step instructions for where and how I should attach a C (common) wire to a Triangle Tube Prestige Excellence 110 boiler for a ecobee3 thermostat? I think ...
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2answers
3k views

Is the transformer bad on my Central Air Conditioner?

Need some help diagnosing a problem. My very old central AC unit isn't working. It's just AC and about a year ago I connected a C-Wire to the air handler when swapping the thermostat for a wifi ...
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1answer
46 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 ...
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1answer
78 views

C Wire in Air Handler

Can someone please help me find where to connect a C wire for my smart thermostat? Here are some pictures with descriptions. It is difficult to get to the 24v connection in the back. My schematic ...
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3answers
78 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 ...
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0answers
9 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 ...
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2answers
132 views

Can I connect my two HVAC systems?

My house has two HVAC systems. One is in the attic and has supply and returns in the ceiling of the second floor. The other is in the basement with supply and returns at the floor of the first floor. ...
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1answer
109 views

High pressure on heat cycle

Newly installed heat pump works on AC all pressures are with in spec but shuts off on high pressure when you go to heat cycle. The pressure goes to 510 and kicks the high pressure switch.
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0answers
29 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 ...
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2answers
54 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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3answers
5k views

What Type of Ducting Should Be Used for a Bathroom Exhaust Fan?

I'm planning on installing a Bathroom exhaust fan (Just a note, the port is 4") and am curious as to what kind of duct should be used. I've heard that the duct should be insulated to prevent water ...
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1answer
13 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 ...
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2answers
2k views

Why might a thermostat refuse to switch from Heat mode to Cool mode?

I have this Honeywell RTHL2410C programmable thermostat and typical Florida electric AC system. Starting this Spring, it has started behaving strangely when switching from Heat to Cool mode. The ...
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2answers
56 views

Adjusting HVAC damper

First summer in this 2 story house and looks like air flow on the second floor is significantly weaker then on the bottom floor. Looked at the HVAC to find the dampener handle and found 1 but it is ...
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1answer
56 views

Insulating built-in air conditioners

My apartment has Frigidaire built-in air conditioner holders. I did not buy a Frigidaire AC unit because the size needed to perfectly fit the holder was unnecessarily large (and expensive). I have a ...
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1answer
36 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 ...
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1answer
18 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
70 views

different sort of ductless, mini-split connection question

I have two small rooms (about 15 feet apart) - one 8 by 10 (8 ft ceiling) and the other 11 by 15 with an 8 ft ceiling that I want to cool with a mini-split system. Both are reasonable well insulated (...
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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 ...