View Full Version : Cellar trip
Went out to a cellar , condensing unit stopped.......
Had tripped on head pressure control.......
Was a standard NRS Cellar , running on R407C
Tripped at 300psi
When I looked at the fins..........it had a thick coat of fur.......was absolutely disgusting.
Then I noticed all the dog food. Dogs had the run of the place. Dog hairs got sucked up into the coil.....I think they slept directly under the condensing unit
I washed it down. blew off.......got the coil cleared. Fortunately a water hose was right beside it.
Got some dog hairs into my mouth............Yurghhhhhhhh
Ran unit up............down to a nice 250psi in a 30C ambient
old gas bottle
19-07-2006, 04:54 PM
was it a blocked haired condensing terrier ???
Jus Walker
19-07-2006, 09:35 PM
Had that problem loads of times. Went to one pub to find that fault. Landlord told me he didnt have a dog!!! But I just laughed!
He wasn't allowed Pets in the pub! lol.
slingblade
20-07-2006, 09:58 AM
300psi is to low for 407c hp switch.
300psi is to low for 407c hp switch.
Bearing in mind that day the outside ambient was hovering around the 35C mark, I thought it was a bit low as well.
I did not change the setting as didnt want to fiddle with what the installation engineer had set it up as.
As after the clean it hovered around 250/260 psi, I was content and left it at that.
What should the HP be set at Sling.........for my future reference
Thx
slingblade
20-07-2006, 09:00 PM
90% of blow off valve setting is a general rule of thumb for hp. an nrs cellar cooler will not have one obviously. i would say that r22 hp is around 350 psig in my experience and as such 407 should be a bit higher. i would get a comparator and look into it further with regards to temp/pressures, but ive had a long day. im sure one of the book worms here will have all the relevant correct ashrae info or some such thing but 350-375 psig suits me.
frank
20-07-2006, 09:15 PM
but 350-375 psig suits me.
I'd agree with that :)
slingblade
20-07-2006, 09:21 PM
I'd agree with that :)
Whooohoooo. i got one right.:D
frank
20-07-2006, 09:23 PM
Steady on now :D
wambat
20-07-2006, 09:44 PM
Whooohoooo. i got one right.:D
Outstanding work :D
micha1
20-07-2006, 09:58 PM
Back in the early 80's when all pubs had dogs, this was normal. now we live in this sterile dump.:rolleyes:
When I got to the pub, the landlord went upstairs and locked the dogs in one of the upstairs rooms.
Access to the condenser unit was on the first floor on a balcony.
Each time I went up the stair, or came down to pick up some kit, the dogs growled.
I kept having fears that "what if" the door inadvertently opened.......I would have a pack of rottweilers destroy this one long served , talented, humurous fridgy.......in one snarly snap of jaws.
My blood pressure rocketed............Im sure
Boy or boy, was I glad to be out of that god forsaken place........:D :D
Now..........if it were cats......................mmmmmm
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