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Thread: Carrier xarios 500
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22-04-2014, 10:04 PM #1
Carrier xarios 500
Got a box running as a freezer on standby only, road compressor blanked off.
When on defrost suction pressure is 2.6 bar but intermittently it rises to 8 bar and cuts out on hp2 switch
Any ideas what could cause this ?
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23-04-2014, 12:41 AM #2
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23-04-2014, 03:27 AM #3
Re: Carrier xarios 500
What's your discharge pressure running?
2.6 bar is the cpr setting. If the xarios 500 is the same as the NA 50x there is a bypass circuit around the CPR. When the discharge pressure rises above 27.5 bar HP4 will close, closing the bypass circuit and brings the CPR back into the system and should lower the discharge pressure as well as the suction.
HP2 switch should cycle the fans on and open the condenser inlet solenoid at about 22 bar at 30 bar HP3 will trip and shut the unit down.
Is the charge weight correct?
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23-04-2014, 07:34 AM #4
Re: Carrier xarios 500
Condenser fan runs and cycles on pressure switch, new motor fitted 2 months ago .there is no by pass valve near CPR only a liquid injection valve
On defrost when operating correctly head pressure sits around 11bar and suction 2.6 bar, when fault occurs head pressure rises to approx 21 bar and suction climbs quickly to 8 bar and above, unit trips pressure switch dropping pressure does this 2 or 3 times during defrost until it terminates defrost on temp and not time
Fitted new standby compressor last week ,changed drier vacc end out overnight and new charge of gas weighed in,unit cools fine
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23-04-2014, 08:40 PM #5
Re: Carrier xarios 500
Why did you change compressor,maybe some **** gone into system,time to strip down upstream from compressor delivery
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23-04-2014, 09:07 PM #6
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24-04-2014, 04:49 AM #7
Re: Carrier xarios 500
Condenser valve leaking will not trip any switches only low heating capacity, hot gas valve leaking would be a problem, oil separators usually will fill up with dirt and not let oil back to compressor it's a must change when road comp fails, never heard of one letting hp back into suction... If used only on stby i would remove injection valve from circuit. Do you have 8 bar on suction after stopping or during operation?
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24-04-2014, 07:35 AM #8
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25-04-2014, 04:32 AM #9
Re: Carrier xarios 500
More likely it's the CPR. Put unit on heat and try changing the cpr settings, measure vap inlet and outlet press , see if messing with the cpr changes anything on suction side.
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04-05-2014, 10:04 PM #10
Re: Carrier xarios 500
Fitted new CPR and repair kits to solenoid valves,Unit has been fine for a week now and all ok
Thanks for all the help