Carrier 23XRV VFD Chiller Soft Start and Ramp Sequence

[joeyf504327]

oh do the cooling towers just evaporate the water to get excess heat out before the water goes into the chiller to be well... chilled?

[hackfreehvac]

@joeyf504327

As the water evaporates it takes heat away form the remaining water.

The loop of water in the cooling towers maintains about 80 degrees which pumps through the chiller condenser to remove the heat form the refrigeration.

[84randomdude]

@joeyf504327 The cooling towers are responsible for keeping the condenser water loop cool. The condenser water loop is the water the circulates through the chiller's condenser barrel to cool the condenser in the chiller. The chilled water circulates through the chiller's chiller/evaporator barrel. The two water loops are separate.

[joeyf504327]

@84randomdude yes i know that as hackfreehvac told me that a while ago, i was just curious as to just what the towers do to cool the water, like where the pumps pump the water to and when the fans run, just more in dept is what i was trying to get at, thanks though

[84randomdude]

@joeyf504327 If you want I can send you a PM explaining how it all works in-depth.

[84randomdude]

Uhh, what kind of building do you have that needs 500 tons of cooling?! Just curious. :)

[hackfreehvac]

@84randomdude

It might be MORE than 500 tons.

The building has a few hundred residential units within the 6 story building (7 stories on one side).

The avg sq ft in teach resi unit is about 1600 or so, like a home.

There is a full service kitchen with about 6 dining rooms. Plus a cafe like area with a dining area.

A floor with ammendaties. A floor with an entertainment area enough for several hundred people to meet.

And all the offices for the managers, etc

10,000+ elec bill for the HVAC

[84randomdude]

@hackfreehvac OH! I thought the building was just for your HVAC Company that you work for. lol!

Thanks for explaining! :-)

[hackfreehvac]

@84randomdude

LOL!

I work at a facility now maintaining what is here in the three buildings.

The main facility uses the chilled water.

I work inside over 90% of the time now too. :-)

The only bad thing is less pay. But it's normal hours and it takes me 15 min to get to work, 15 min to get home each day. That gains me almost 2 hours of personal time back each day from driving to and from my first/last calls as i did in the field.

[AirplaneVideos1]

So do you like Carrier comercial equipment? This one seems very good!

Awesome video man!

[hackfreehvac]

@AirplaneVideos1

It happens to be what we have. It is a sweet unit. About 4 years old maybe.

But it did have to get a new VFD soon after it was installed (before i worked there) and last spring it had to get the float valve fixed (metering device).

It was starving the evap and shutting down.

Both fixed under warranty by Carrier.

The higher end stuff is nice. People tell me the effinity is really cool for resi. But some of their stuff is thin crap compared to old stuff like 50QQ's, etc.

[AirplaneVideos1]

@hackfreehvac Oh ok, I have heard Carrier warranty is good. Infinity is a great system, and the new inverter 25VNA is what they say the highest end unit for residential, but I have not seen it. Base line stuff mostly has always in the 2000+ era has been crap, specially 24ABR's and the older 38CKC's. 50QQ's were insane!

Old Carrier stuff was built like tanks, such as old Rheem and Trane stuff as well. Now Trane is a little cheapy compared to their older stuff, do you agree?

[84randomdude]

@hackfreehvac Like you said a while ago, I too have a preference to Trane equipment. ;-)

[Straycurrent]

Nice equipment. I'm amazed at VFD technology and the fact that it can control such large electrical loads using a relatively small control unit. Does the VFD cool itself with just the ambient air in the mech room, or does it get some cooling help from the chill water loop?

[hackfreehvac]

@Straycurrent

I've only been into that panel once (because the unit is almost always running) and I'd think it is cooled by the refirgerant itself through the heat sink.

There are also some cooling fans.

The major service to this unit is done by Carrier. I fix everything else around it.

The Carrier guy did say they had issues when it was new but went with another "vender" for a better VFD which was installed in this thing under warranty.

It is pretty sweet. And quiet.