Results 1 to 6 of 6
-
20-08-2008, 05:47 PM #1
MHI FDCA400HKXRE4 Tech Info Please
Hey Guys,
Wondering whether anyone can help at all, one of our engineers called today with a fault on a mitsubishi heavy industries vrf saying the unit keeps going out on lp. After asking the engineer the usual questions he cant seem to find a leak although he says there are traces of oil around the suc/dis pipes on the condenser. I'm wondering whether anybody has any technical details on the above unit at all as the commissioning data is not present with the unit and i'm unsure of additional charge weights. Unit has a standard charge weight of 17kg R410A.
I've already done a search on here and couldnt find anything and have also tried 3dair's site and heronridge and mhi's site, does anyone have any other suggestions.
Many thanks in advance.
Lee
-
20-08-2008, 07:06 PM #2
- Join Date
- Sep 2007
- Location
- Split Croatia
- Age
- 57
- Posts
- 6,151
- Blog Entries
- 6
- Rep Power
- 36
First you need to find total amont of refrigerant:
Originally Posted by from manual
After that, find leak or leaks (or maybe you could find leak with good electronic detector before evacuation) and repair. Make pressure test for tightness with nitrogen, at least 12 and preferably 24 hours, with noting ambient temperature at beginning and at end of test. Variation in nitrogen pressure should be 0,1bar/K.Last edited by nike123; 20-08-2008 at 07:19 PM.
-
20-08-2008, 11:06 PM #3
Re: MHI FDCA400HKXRE4 Tech Info Please
Hey Nike123,
Thanks for the tech sheet its just what i've been looking for. Have passed instruction to the engineer to recover & weigh out what refrigerant is left within the system, pressurise with OFN and check cond/bs/evaps and all accessable brazed/flared joints for leaks. The only thing we were struggling with was whether any additional charge needed to be added to the system as the commissioning data has not been filled in on the condenser and no data had been left with the client.
Many thanks yet again.
Lee
-
20-08-2008, 11:12 PM #4
Re: MHI FDCA400HKXRE4 Tech Info Please
Before that, check you haven't got a problem with the sensor.
Turn the system off and check the standing pressure on your gauges. Then if any of the remotes are the RCE1 version of wired remote
press the check button
press the set button until you get "data loading"
scroll through to item 25 LP sensor using up/down buttons above check button
the reading will be in MPa so times by 10 for bar.
Sensor reading should be close to the reading on the gauges if not faulty sensor or board.
Also as this is a 3 pipe unit chech that all the indoor units cool in test cooling or heat in test heating as the problem could be in bs boxes or the relay boxes. if you dont get either cooling nor heating then check the expansion valve.
If all else fails try the 3d/hrp tech support on 01359272211 as they will at least be able to give you tech info.
Brit
-
23-08-2008, 10:03 AM #5
Re: MHI FDCA400HKXRE4 Tech Info Please
Guys,
Many thanks for all of your help, managed to find a leak on the first cassette in line on the suction flare, plenty of oil all over the ceiling and god knows how the engineer missed it lol. the system had lost 4.5kgs r410a, fixed leak, pt 650psi for 24hrs vac'd down to 30cfm and recharged 17kgs standard and an additional 10kgs and system is now running sweet. think i'll take him down to specsavers on tuesday lol.
Thanks again for all of your help yet again and hope you all have a good bh weekend.
Lee
-
23-08-2008, 11:00 PM #6
Re: MHI FDCA400HKXRE4 Tech Info Please
Thanks for the update Lee and glad to read that the problem has been resolved.
Brian - Newton Abbot, Devon, UK
Retired March 2015
Similar Threads
-
Need Info on C-R170H5B compressor
By Raadster in forum Air ConditioningReplies: 3Last Post: 08-07-2008, 03:56 AM -
Need info on the shaft seal system for scotsman
By The MG Pony in forum CommercialReplies: 4Last Post: 17-03-2008, 02:02 AM -
fujitsu tech info
By Krups in forum Air ConditioningReplies: 11Last Post: 01-12-2005, 07:41 PM -
Fuji electric tech info
By Mickvee in forum Air ConditioningReplies: 5Last Post: 04-07-2005, 07:07 PM -
Tech info or direction to for data Mitsubishi RR120 220/240v rotary compressor
By eskimo2 in forum Technical SpeculationsReplies: 4Last Post: 04-01-2005, 04:04 AM