PDA

View Full Version : Carlyle/Carrier 5H66 breakdown of valves



maskinmester
19-04-2011, 08:21 PM
Hi.
After multible breakdown of suction/pressure valves in my 5H66 compressor, im asking you fine people for help.

Equipment:
Air condition unit
Carlyle 5H66 394
Refrigerant R404A
Oil: Bitzer BSE32
Speed 1770rpm(maximum rated by carlyle 1750rpm)
Suction pressure: 4,8bar
Discharge pressure: 17,5 bar
Oil pressure: 10 bar
Temperature refrigerant after evaporator 11 degreese celsius.

After multible breakdowns of valve plates i found clogged oil return pipe.
This is the oil return check valve that drain oil from sylinder compartment back to crankcase. Probably building up oil in cylinder compartment, causing oil in cylinder.

Because of earlier breakdown its natural to find debrees and clogging of oil pipe.
But on a new compressor i dont understand why.

This compressor was installed in january after same problems on past compressors.

Installed pressure gauge to crankcase, 4,8bar. following same pressure as suction pressure.

So my question is:
Why is this compressor giving me trouble?

liquid trap suction line checked for oil, none
Condenser checked for oil, none.

Pardon my english
Best regards
mm

Magoo
20-04-2011, 01:23 AM
Hi discharge temps, 5H66 requires an oil cooler, is an oil cooler fitted?.

maskinmester
20-04-2011, 01:45 AM
Hi.
Oil cooler is fitted to compressor. Discharge temp. monitored by thermostat switch..

mm

Magoo
20-04-2011, 02:13 AM
Has system always operated on R404A, or has system been converted from say R22. , check valve plate clearances for 404, problem still sounds like high discharge gas temps, if smashing valve plates. Have you contacted Carrier regarding the problem.

maskinmester
20-04-2011, 01:06 PM
System has been converted from R22.
But found in old history for this compressor that this problem also was happening when running with R22.
Temperature discharge pipe 75 celsius.
Temperature crankcase 57 celsius.
Suction pipe refrigerant 15 celsius
Measured with laser heat tracer.
Not 100% load, probably about 50%- 66%. This is normal load for this system.
mm

maskinmester
20-04-2011, 04:41 PM
Correction previous post.
Temperature crankcase 54 celsius.
Suction pipe refrigerant 15 celsius
Measured with laser heat tracer.
Not 100% load, probably about 66%- 83%. This is normal load for this system.
mm

maskinmester
20-04-2011, 08:20 PM
You are correct Magoo...
Oil temp to high. High discharge temp.
Inspected valves and liners. The characteristic blue color of heat found on top of liner and discharge valve bracket.
Increased cooling.
But my worn out pistons creating a lot of heat.
New parts on order, hope they receive soon.
Thanks
mm

Magoo
21-04-2011, 12:38 AM
Running compressor part loaded will aggrivate problem, with gas regenerating in cylinders. The discharge gas temp will be very high at the actual valve plate. You may have to look at some sort of suction gas cooling, with a liquid injector into line, when part loaded.
If problem existed earlier when on R22, definitly needs suction cooling added. A head cooling fan may also help remove heat from cylinder heads. The oil in crankcase should be around +40 > 45'C.