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How much ventilation is required for furnace and water heater?

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How much ventilation is required for furnace and water heater? submitted by /u/jboeke
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Freak yeah. Free lunch.

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Freak yeah. Free lunch. submitted by /u/thefish1013hvac
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Always check your voltage! Don’t be an idiot like me :(

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Friday I changed out a compressor in a carrier split system. Got done with everything, charged it up, went to flip the disconnect and boom no power…realized my breaker to the disconnect had tripped. Ohmed our everything I could thinking I had a short to ground. Then I took a glance at the label on the brand new compressor I just put in and it clearly said “208-230 3 phase” and it was a 460v unit. So now I’m back on a Monday with the correct compressor. Learn from my mistake! Don’t trust the factory to get it right for you. Have a good week!

submitted by /u/binkbonkdinkdonk
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Multizone question for pros

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Hey guys. I'm a tech with about 10 years service experience and now I'm behind the counter at a wholesaler. I've got an interesting question from a local tech.

He's installing a multizone on a toy hauler for someone. He wants to have zone 1 permanent install in a trailer and zone 2 detachable in a toy hauler. I need to find a quick coupler that's

  • removable

  • won't limit flow

  • minimal pressure loss

Anyone ever set up anything like that?

submitted by /u/MrFlynnister
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in the summer, houses without air conditioning will not benefit from an ERV dehumidifying the hot humid outdoor air

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Can someone explain this phrase? Took it from vanee.edenenergy.com/hrv-or-erv.php . I plan to install fancoil FVM4x (+heater element 10kw) and also would like to connect Humidifier (aprilaire) and ERV air exchanger. Can ERV and humidifier be installed in separate duct system, or they should push air through furnace fan (in fan mode only for example)

submitted by /u/perlon
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Furnace problem, blower constantly running, no light on control board

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Long story short, when switching on the power to the furnace, the blower motor turns on regardless of thermostat setting. Replaced the control board, same issue, I checked the transformer to the wall and it puts out 24v so I checked the board and it looks like the board isn't sending 120v to the transformer. Checked limit switches and all were showing continuity. Any ideas? Would powering the transformer from the outlet the pump is on to see if the board powers up a bad idea? I'm stumped at this point.

submitted by /u/secretkon87001
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