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8 votes
Accepted

HVAC Thermostat not powering on, blown transformer?

Somehow, the breaker swap put both hots on the same leg of the service From the wiring diagram (and the fact the transformer lacks a 120V input), we can tell that this is a 240V air handler. So, it ...
5 votes
Accepted

AC disconnect auxiliary/service outlet wiring

There is no need for a 120V circuit to be part of a mini-split installation. People often get confused by this because of a clause in Code. That is there to address the needs of the A/C maintainer to ...
5 votes

Can I drill into drywall where HVAC duct lies?

Take off that vent grate and look inside. You should be able to see the depth of the vent boot that connects to the duct and make a reasonable determination of the amount of space you have between ...
  • 2,372
4 votes

Mini Split Leaking

If you want cold, you get drips. That is the reality of how thermodynamics works. Every evaporator (or on heat pumps, reversible condenser/evaporator) must have a drip pan underneath it. That is ...
3 votes
Accepted

Adjust Multi-Speed Carrier Furnace via thermostat as in manual, or need to rewire?

Unfortunately you do not have the "Automatic Fan speed control" However you can still change the Fan speed by charging the Fan Motor wiring. Obviously you would Turn Off the power and verify ...
  • 4,143
3 votes

Can I drill into drywall where HVAC duct lies?

Yeah, you can. Drill for the screw, though, not the anchor. If you hit metal immediately behind the drywall, just mount your camera to that. It will not hurt a thing. There are already many holes ...
  • 108k
2 votes

Can I drill into drywall where HVAC duct lies?

Start by drilling a hole only 1/2 inch deep. Just enough to penetrate the drywall and not more. Now insert a long screw or nail to the depth of your planned anchor. If will feel any resistance then ...
  • 4,143
2 votes
Accepted

Install C wire on dual zone hvac board for Nest - no c wire terminal

Your zone board doesn't use standard North American thermostats Unlike many zone boards out there, yours uses proprietary control heads that communicate with the zone board over a digital data link, ...
2 votes

Why is this HVAC duct not connecting to the return?

To answer the titular question of "why it's this way", either: Perhaps someone stopped work to ask whether or how to connect both 1 and 3 to the trunk and forgot about it. Get out your ...
  • 32.1k
2 votes
Accepted

How to disinfect and clean a condensate water trap

Since it appears to be all plastic, and it's been removed, I'd soak it in a moderately strong solution of chlorine bleach for a day or two, per directions on the bleach, and scrub with a bottle brush ...
2 votes
Accepted

How do I remove a collector box from a rheem furnace

So all it took was a lot of force. Removing the screws was enough and I just needed to pull against the adhesive and it popped right off.
2 votes

can I install an inline check valve on a condensate drain line down pipe?

Yes you can install this as you want but, I am not sure it will work as you expect. Your condensate lines are not under pressure and rely on gravity fall for any water to exit them. Check valves ...
  • 3,712
2 votes

Need a product to change my round HVAC damper and diffusers to square

Easily won't happen here. If you want to waste considerable effort and money on what appears to be a minor aesthetic change, you can do this. It will involve ripping into the ceiling to install round ...
  • 145k
1 vote

Need help identifying CSST manufacturer

If the conversation at InterNACHI is correct, then your CSST is Titeflex brand.
  • 21k
1 vote

New dehumidifier making rhythmic pulsing noise. How to fix?

Perform simple test. Set it on solid ground. Noise still there ? You build a boom box there that amplifies vibrations
  • 4,143
1 vote

120v vs 240v Mini Split Efficiency

Most U.S. utilities do not charge residential customers for poor power factor so there is little incentive for manufacturers of appliances to improve it. E.U. has PF regulations on all electrical ...

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