Jeff Montalvo shows us a commonly missed issue on Trane Voyager gas package units, how to get to it and what to watch for.
–Bryan
Category: All Videos
I was talking about dry contacts with one of my techs and he was looking at me like I had three heads and one of them was on fire.
So I figured it would be good to cover the difference…
Basically “dry” contacts is a switch that has no shared power source or supply integral to the control. A common example would be the contacts in a compressor contactor. The contactor has a 24v coil (in residential) but the power supply through the contacts doesn’t have any connection to the coil.
We see wet contacts every day when we connect a residential thermostat. A thermostat uses the same voltage/power source to power the control that it passed to the contacts from the “R” terminal.
This is especially important to differentiate when working on commercial equipment that may have different and varied control. The Danfoss ERC 213 shown above is an example where the compressor (terminals 1 & 2) may be of a different voltage than the wet contacts on 5&6 which must be 120V.
Here is a video where I describe this in more detail –
— Bryan
Recovery, Installation, Brazing, Evacuation and charging of a pool heater with a shorted compressor. Featuring Sam Behncke.
–Bryan
HVAC school shows the right way to splice control cable and sensor wires in mission critical applications like market refrigeration. Featuring Alan Yanik.
–Bryan
ou just bring the heat…we got the rest covered! Everything you need for that fix, in one easy to carry kit!! Your day just got a whole lot easier… The kit comes in two varieties, includes your choice of Sil Sol 5% (Silver Phosphorus Brazing Rods) or Sil Sol 15% (Silver Phosphorus Brazing Rods). It also includes, what we like to call, “The Game Changer”.
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–Bryan
HVAC school welcomes Bert to show how to clean an evap in place with Viper.
Refrigeration Technologies: www.refrigtech.com
–Bryan
HVAC school reviews how defrost works and how to test it in Carrier and Trane systems. Featuring Jesse Claerbout and Bill Frisbie. Hosted by Bryan Orr.
–Bryan
HVAC school reviews the components of the basic heat pump and how they all work. Featuring Jesse Claerbout and Bryan Orr.
–Bryan
During an HVAC school training class something strange started happening with the COR thermostat on the wall that was worth sharing. The temperature kept rising for apparently no reason. Featuring Bryan Orr.
–Bryan
HVAC school introduces the anatomy of electrocution, arc flash and an intro to PPE and lockout/tagout. Featuring Bryan Orr.
–Bryan
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