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1 vote
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How do I drive an ERV directly from EAC output of a Thermo Pride O6 Furnace?

I used this hobby box, this relay, and thisresitor. The 150 Ohm 1/8 W resistor looked too scary for a 24V circuit, so I used a 5 W resistor. The schematic is from the control box description. Works ...
zzz777's user avatar
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3 votes
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Better Strategy: Add more HVAC Registers or fully insulate walls?

You'll pay for insulation once, you'll pay your heating bill every month, so I'd focus on insulation. The dehumidifier is likely running a lot with low humidity already, and its waste heat is ...
Milwrdfan's user avatar
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1 vote

How to prevent furnace fresh air intake pipe from disconnecting

I agree with HABO that no harm has been done. I have a different take on the right solution, though. Since it's in intake duct, there's no outward pressure. And since it's a top-mounted vertical ...
isherwood's user avatar
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0 votes

How to prevent furnace fresh air intake pipe from disconnecting

A hose clamp might also be sufficient to compress the black collar onto the white pipe. Not necessarily applicable to this case, but for dryer vents, screws intruding into the air flow is a no-go ...
CrazyArm's user avatar
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3 votes
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How to prevent furnace fresh air intake pipe from disconnecting

Assuming that the pipe seats deeply enough in the collar you can secure it with three screws driven in 120° apart through the collar into the pipe. Running the furnace without the pipe connected ...
HABO's user avatar
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1 vote

Extending the exhaust pipe of my furnace

You haven't mentioned exactly which Goodman model you have but instructions are fairly consistent across models and time. I'm referring to instructions for a *MVC96 model. Your plan to extend the flue ...
Greg Hill's user avatar
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2 votes

Should I run my furnace fan constantly to distribute heat and moisture?

If the ducts are in a cold enviroment such as attic or crawl space, having the fan on all the time will circulate cold air throughout the homes interior, causing the heating system to cycle more often....
RAK's user avatar
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6 votes

What's wrong with my furnace blower wiring (only works on AUTO)?

Temporarily connect G to R, if the fan starts the problem is not on the controller board. In that case find the other end of the red cable and connect the red and black wires, if the fan starts now ...
Jasen's user avatar
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1 vote
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Troubleshooting Lennox furnace error code E228 -- failed to calibrate pressure switch

The solution to the problem was simply to replace the pressure switch. It's a dual pressure switch, with a high and low setting. Apparently these are "Costa Rica" switches that tend to fail ...
Rodrigo's user avatar
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2 votes

How can I connect C-wire at 2-wire Boiler side with existing 24v transformer?

The two spare wires can be used as C. You definitely have C, it's one of the terminals on the transformer on the wall. We can't tell which one from the information you've given us. Your Hydrostat ...
jay613's user avatar
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1 vote

Extending the exhaust pipe of my furnace

Yes, that much length on the exterior is a freeze concern. You normally have a fairly short stub through the wall or roof which doesn't allow the steam to cool enough to freeze. An enlarged terminal ...
isherwood's user avatar
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1 vote

Is this the proper way to insulate & vent shed style detached garage roof?

As long as you have substantial venting at both top and bottom (or near them) this should work fine. No, you don't need additional ridge vent--enough scavenging should occur in that small section. Yes,...
isherwood's user avatar
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1 vote

Connecting 10"x3.25" rectangular duct in wall cavity

That duct material is manufactured for S and drive cleats the way you've described but you don't have to use it that way. If you un-fold the drive cleat part, or simply cut the duct all the way around ...
Greg Hill's user avatar
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0 votes

A/C blower does not work after a power surge

Remember that a surge is more likely to have damaged the control electronics rather than the motor ...
keshlam's user avatar
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0 votes
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How can I connect a new thermostat wire to a furnace without terminal screws?

If it's a single zone, just splice the new thermostat's wires into the existing wires, in parallel with the old thermostat. ("Wire OR" -- if either thermostat is calling for heat, heat is on....
keshlam's user avatar
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0 votes
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Would it work to have a pellet furnace with heat pump AC on same duct trunk?

I do not see any reason why this manual A-B switch for the ducts would not work. If return air is fed to both the heat pump AC and the pellet stove, then you're basically toggling one HVAC source or ...
Triplefault's user avatar
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2 votes

Can I reverse polarity of an AC compressor fan motor?

Yes it is possible for that fan motor to run in reverse, and it is a routine failure mode -- but usually not a failure of the motor! That motor is almost certainly a single-phase induction motor. This ...
Greg Hill's user avatar
  • 30.4k
2 votes

Can I reverse polarity of an AC compressor fan motor?

This depends too much on the type of motor for there to be any definitive answer. On a brushed / universal motor, reverse the field and armature relative to each other and the motor will reverse. What ...
Harper - Reinstate Monica's user avatar
1 vote

Connecting Nest thermostat to this power adapter

The lower right (grounded) terminal is the C connection on the 24V side.
Ryan.'s user avatar
  • 31
0 votes

Can I reverse polarity of an AC compressor fan motor?

Yes it is possible Motors may have a reverse switch, and many will run in reverse if they are wired wrong at installation.
Tiger Guy's user avatar
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0 votes

Does the 2’ rule apply to return ducts?

The rule would not apply. The partial vacuum in a return trunk behaves very differently from the pressurized supply trunk.
isherwood's user avatar
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