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Thread: coil cleaning
10-18-2012, 09:51 PM #14New Guest
- Join Date
- Nov 2008
average time is 25 mins each.. ill walk you through it. the owner had to show me this routine three days in a row because honestly i couldn't believe it.. i wonder if he thought i was stupid.. oh well...
1 on the way to the site call customer (sched. maint)
2 arrive and place ladder.
3 pull out hose attach to water source... alot of times this is pretty tricky finding water...
4 take hose and new bright up on roof spray condinser with cleaner
5 open filter panel pull filters out and hit evap with cleaner
6 back-flush condensation drain pan
rinse both coils check belts and get off roof.
25-30 mins regardless of size that's time from leaving last job to finishing current.
now that ive been there for a while its gone up to 26 a day...
we do most accounts 2-5 times a year..
avg cost for a 10 ton carrier weather maker... 150 each cleaning
i make $13.hr
10-19-2012, 11:41 AM #15
10-19-2012, 07:16 PM #16
10-19-2012, 08:43 PM #17
I wouldn't use NuBrite on the condenser coils, either. Unless your business plan is to wash the condenser this year and replace the condenser coil next year. If I walk up to a unit that I can knock the aluminum off the condenser coils just by brushing my finger along it, I know that it will foam up with NuBrite if I hit it with a water hose. Pisses me off when I see someone's destroyed the condenser on a perfectly good chiller with that stuff.
The best method I've found for cleaning condenser coils on commercial units is to use a pressure washer. As long as you're not a dumbass about it, you won't flatten the coil or cause any damage to the unit, and you'll get a condenser as clean as it was when it left the factory.
I did a little experiment one day to test this out. I had two identical Trane RTUs on a mall; condensers were filthy because of a nearby construction site. Anyway, I had city water pressure, two gallons of NuBrite, and a pressure washer. I also had way too many hours to do this thanks to a generous quote. Both these RTUs were R22 machines running around 390 head pressure even in the early morning. I washed one with water only -- head pressure settled out at 350. Washed the other one with NuBrite, rinsed it forever, and the head pressure settled out about 330 PSI. I hit both units with the pressure washer and got the head pressure down to 240 where it was supposed to be, and I had the same results with the pressure washer on another identical Trane RTU at the store next to it a few days later. So I was sold on using the pressure washer after that.
10-19-2012, 08:48 PM #18
Of course, I've found an even better way of cleaning coils, and that's to send an apprentice with a pressure washer to clean 'em whilst I'm on a service call where I can make the company a bit more profit than having a journeyman on a labor-only call washing coils.