Carrier 50UA-UH 135 - Start-Up Procedures; Preliminary Checks for Start-Up; Actual Unit Start-Up and Defrost Cycle

s 4HEGIVENWIRELENGTHLIMITSTHEVOLTAGEDROPTO
(length L in metres - see table below).
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2
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36 1 x6 PVCCu 65
50 1 x10 PVCCu 80
66 1 x16 PVCCu 95
84 1 x25 PVCCu 115
104 1 x35 PVCCu 130
123 1 x50 PVCCu 160
155 1 x70 PVCCu 175
192 1 x95 PVCCu 195
235 1 x120 PVCCu 160
285 1 x150 PVCCu 175
350 1 x185 PVCCu 195
 - Full load current, A
Power and control cable entry
&ORTHECABLEENTRYREFERTOTHECERTIlEDDIMENSIONAL
drawing for the unit.
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Refer to the Touch Pilot#ONTROLS)/-ANDTHECERTIlED
WIRINGDIAGRAMSUPPLIEDWITHTHEUNITFORTHElELDCONTROL
wiring of the following features:
s 2EMOTEONOFFSWITCH
s $EMANDLIMITEXTERNALSWITCH
s 2EMOTESETPOINT
s !LARMALERTANDOPERATIONREPORT
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ATTENTION: After the unit has been commissioned, the
power supply must only be disconnected for quick mainte-
NANCEOPERATIONSONEDAYMAXIMUM&ORLONGERMAINTE
nance operations or when the unit is taken out of service
the power supply must be maintained to ensure supply to
the heaters (compressor oil crankcase heaters for unit frost
protection).
After all possible options have been connected, the trans-
former ensures the availability of a usable 24 VA or 1 A
power reserve for the control circuit on site.
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Never be tempted to start the rooftop unit without reading
fully, and understanding, the operating instructions and
without having carried out the following pre-start checks:
s %NSURETHATALLELECTRICALCONNECTIONSAREPROPERLY
tightened.
s %NSURETHATTHEUNITISLEVELANDWELLSUPPORTED
s #HECKTHECONDITIONOFTHEDUCTWORKINCASEDAMAGE
has occurred during installation.
s 4HEAIRlLTERSHOULDBECLEANANDINPLACE
s !LLTHEPANELSSHOULDBElTTEDANDlRMLYSECUREDWITH
the corresponding screws.
s -AKESURETHATTHEREISSUFlCIENTSPACEFORSERVICING
and maintenance purposes.
s #HECKTHEDRAINCONNECTIONS
s %NSURETHATTHEREARENOREFRIGERANTLEAKS
s #ONlRMTHATTHEELECTRICALPOWERSOURCEAGREESWITH
the unit nameplate rating.
s -AKESURETHATCOMPRESSORSmOATFREELYONTHERUBBER
isolators.
WARNING: The compressors are mounted on vibration
isolators. Do not loosen or remove the support mounting
bolts.
s #HECKIFTHEPHASEROTATIONISINTHERIGHTORDERFOR
supply air fan, outdoor air fan and compressors.
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IMPORTANT:
s #OMMISSIONINGANDSTARTUPOFTHEUNITMUSTBE
SUPERVISEDBYAQUALIlEDREFRIGERATIONENGINEER
s 3TARTUPANDOPERATINGTESTSMUSTBECARRIEDOUTWITH
ATHERMALLOADAPPLIEDANDTHECORRECTAIRmOWRATE
circulating through the indoor coil.
s !LLSETPOINTADJUSTMENTSANDCONTROLTESTSMUSTBE
carried out before the unit is started up.
s 0LEASEREFERTOTHETouch Pilot control manual.
The unit should be started up in Local ON mode.
Ensure that all safety devices are SATISlEDespecially the
high pressure switches.
Actual start-up should only be done under the supervision
OFAQUALIlEDREFRIGERATIONMECHANIC
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7HENTHEOUTDOORTEMPERATUREISSUFlCIENTLYLOWAND
depending on the atmospheric humidity, the water condens-
ing on the outdoor coil freezes and this impedes correct air
mOWANDHEATEXCHANGERATE)TISNECESSARYTOREMOVETHE
ice by melting it. This will be done by changing over the
reversing valve on the solenoid coil. This reverses the system
cycle and injects hot gas into the outdoor heat exchanger.
Defrost will be completed when the outdoor coil reaches
the defrost temperature setpoint or after a predetermined
period of time from the start of the cycle.
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