Carrier 48HJ run

Test run of a Carrier 48HJ Five ton packaged heating/cooling rooftop unit we installed as a trainer in the Air Conditioning and Refrigeration Technology class at Mt. San Antonio College just after I hooked up the power and thermostat. My good friend Dave is adding R-22 to the unit.

Category:

Howto & Style

Tags:

• Air
• Conditioner
• Packaged
• Unit
• HVAC
• Mt.Sac
• Freon
• R-22
• Thermostat
• Run

[82dwkamp]

Nice to have units like that running to teach students...however why in the world would you be adding refrigerant to a new pack unit?

[yuandrew]

@82dwkamp

This was actually a used unit that was donated by Southern California Edison (our electric utility) who originally used it as a demonstration unit as well. Dave had ran hoses from the Schrader valves inside the unit through through one of the panels (visible at 21 seconds) so we could hook our gauge manifolds up and take readings without removing the panel but it turned out the high side hose was leaking

(I had to locate and fix the leak later )

[xXxmidgexXx]

Wow! The internal suction fan is power.Are you using that for anything like you house?

[yuandrew]

This is a 5 ton commercial unit that is way too big for the house I'm in but would definitely work well for a mansion provided you have three phase power available. This unit would most likely be used for a small to medium sized office area.

The belt driven indoor fan itself (seen at 38 to 43 seconds) is pretty powerful and some of us have gotten sucked against the return. The supply end, of course, BLOWS!

[DrZarkloff]

Was that a heat recovery unit installed inside?

[yuandrew]

It's a packaged Air Conditioner and Gas Heater. We "installed" these in the HVAC lab area as "trainers" for people attending the Air Conditioning class. You would normally find this on the roof of a building.

We replaced some of the access panels with Lexan so one can see the working parts inside.

[hackfreehvac]

Nice job with the plexi-glass. Well, you picked a Carrier RTU. At least you'll have something that will need some repairs soon. :)

I know those units pretty well myself. Mostly heat pumps here though.