Carrier 50UA-UH 135 - Maintenance Levels and Procedures; Level 1 Maintenance; Level 2 Maintenance; Level 3 (or higher) Maintenance

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See note in chapter 15.5. Simple procedures, can be carried
out by the user on a weekly basis:
s 6ISUALINSPECTIONFOROILTRACESSIGNOFAREFRIGERANTLEAK
s #OILCLEANINGSEECHAPTER@)NDOOROUTDOORCOILS
level 1’,
s #HECKFORREMOVEDPROTECTIONDEVICESANDBADLY
CLOSEDDOORSCOVERS
s #HECKTHEUNITALARMREPORTWHENTHEUNITDOESNOTWORK
(see report in the
Touch Pilot control manual),
s 'ENERALVISUALINSPECTIONFORANYSIGNSOFDETERIORATION
s 6ERIFYTHECHARGEINTHESIGHTGLASS
s #HECKTHATTHETEMPERATUREDIFFERENCEBETWEENTHE
heat exchanger inlet and outlet is correct.
s 6ERIFYTHEUNITOPERATINGPARAMETERSATFULLLOAD
against the ones found during start-up.
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3EENOTEINCHAPTER4HISLEVELREQUIRESSPECIlCKNOW
HOWINTHEELECTRICALHYDRONICANDMECHANICALlELDS)TIS
possible that these skills are available locally: existence of a
maintenance service, industrial site, specialised subcontractor.
The frequency of this maintenance level can be monthly or
ANNUALLYDEPENDINGONTHEVERIlCATIONTYPE
In these conditions, the following maintenance operations
are recommended.
Carry out all level 1 operations, then:
Electrical checks
s !TLEASTONCEAYEARTIGHTENTHEPOWERCIRCUITELECTRICAL
connections (see table with tightening torques).
s #HECKANDRETIGHTENALLCONTROLCOMMANDCONNECTIONS
if required (see table with tightening torques).
s 2EMOVETHEDUSTANDCLEANTHEINTERIOROFTHECONTROL
boxes, if required.
s #HECKTHESTATUSOFTHEFUSESCONTACTORSDISCONNECT
switches and capacitors.
s 2EPLACETHEFUSESEVERYYEARSOREVERYHOURS
(age-hardening).
s #HECKTHEPRESENCEANDTHECONDITIONOFTHEELECTRICAL
protection devices.
s #HECKTHECORRECTOPERATIONOFALLHEATERS
s #HECKTHATNOWATERHASPENETRATEDINTOTHECONTROL
box.
Mechanical checks
s #HECKTHETIGHTENINGOFTHEFANTOWERFANCOMPRESSOR
ANDCONTROLBOXlXINGBOLTS
s &ANBEARINGSSHOULDBELUBRICATEDEVERYSIXMONTHS
&ORHIGHERTEMPERATURESANDORINCREASED
contamination, the lubrication interval should be
adjusted as required.
'REASE1UANTITY0RESSGREASEINTOBEARINGUNTILFRESH
grease is escaping.
Refrigerant circuit
s &ULLYCLEANTHECONDENSERSWITHALOWPRESSUREJETAND
a bio-degradable cleaner (counter-current cleaning -
SEECHAPTER@)NDOOROUTDOORCOILSLEVEL
s #HECKTHEUNITOPERATINGPARAMETERSATFULL
load and compare them with previous values.
s 6ERIFYTHETIGHTENINGOFTHEBULBWITHCAPILLARYTUBEOF
the thermostatic expansion valve. The bulb is best
MOUNTEDINAPOSITIONCORRESPONDINGTOO@CLOCKOR
O@CLOCK
s #ARRYOUTANOILCONTAMINATIONTEST2EPLACETHEOILIF
necessary. Carrier ERCD reference: 7754024.
s #HECKTHEOPERATIONOFTHEHIGHPRESSURESWITCHES
Replace them if there is a fault.
s #HECKTHEFOULINGOFTHElLTERDRIERINCOOLINGMODE
Replace it if necessary.
s +EEPANDMAINTAINAMAINTENANCESHEETATTACHEDTO
each HVAC unit.
All these operations require strict observation of adequate
safety measures: individual protection garments, compliance
with all industry regulations, compliance with applicable
local regulations and using common sense.
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See note in chapter 15.5. The maintenance at this level
REQUIRESSPECIlCSKILLSAPPROVALTOOLSANDKNOWHOWAND
only the manufacturer, his representative or authorised
agent are permitted to carry out these operations. These
maintenance operations concern for example:
s !MAJORCOMPONENTREPLACEMENTCOMPRESSORCOILS
s !NYINTERVENTIONONTHEREFRIGERANTCIRCUITHANDLING
refrigerant),
s #HANGINGOFPARAMETERSSETATTHEFACTORYAPPLICATION
change),
s 2EMOVALORDISMANTLINGOFTHE(6!#UNIT
s !NYINTERVENTIONDUETOAMISSEDESTABLISHEDMAINTE
nance operation,
s !NYINTERVENTIONCOVEREDBYTHEWARRANTY
s ONETOTWOLEAKCHECKSPERYEARWITHACERTIlEDLEAK
DETECTORANDCARRIEDOUTBYAQUALIlEDPERSON
To reduce waste, the refrigerant and the oil must be trans-
ferred in accordance with applicable regulations, using
methods that limit refrigerant leaks and pressure drops
and with materials that are suitable for the products.
Any detected leaks must be repaired immediately.
The compressor oil that is recovered during maintenance
contains refrigerant and must be treated accordingly.
Refrigerant under pressure must not be purged to the open
air.
If a refrigerant circuit is opened, plug all openings, if the
operation takes up to one day, or for longer periods charge
the circuit with nitrogen.
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