![background image](http://html.mh-extra.com/html/carrier/weatherexpert-48n2/weatherexpert-48n2_controls-start-up-operation-service-and-troubleshooting_2561505259.webp)
CL-3
Start-Up Checklist for 48/50N-Series Packaged Rooftop
(Remove and use for Job File)
I. Project Information
Job Name __________________________________________________________________________________________________
Address ____________________________________________________________________________________________________
City ___________________________________________________________ State ____________________ Zip ______________
Installing Contractor Name ___________________________________________________ Phone ___________________________
Equipment tag / Mark for ______________________________________________________________________________________
Sales Office _________________________________________________________________________________________________
Prestart-up Performed by (Name) _______________________________________________ Phone __________________________
Unit Model (18 Chars) ____________________________________________ Serial (10 Chars) ____________________________
Design Information
II. Start-Up
Electrical
(All readings to be taken at full load
Compressor Motor Current (amps):
Condenser Fan Motor Current (amps):
Supply Airflow
(CFM)
External Static
Pressure (ESP)
Return Air Temperature (RAT)
Supply Air
Temperature
Condenser
Entering Air
Temperature
Dry Bulb (DB)
Wet Bulb (WB)
Supply Voltage
L1-L2 ______________ L2-L3 _______________ L3-L1 ___________
Check Voltage Imbalance
Average Voltage = (L1-L2 + L2-L3 + L3-Ll)/3
Maximum Deviation from Average Voltage = _______________
Voltage Imbalance = _______________% (max. deviation/average voltage) x 100
Voltage imbalance less than 2%.
Yes
No
(Do not start unit if voltage imbalance is greater than 2%.
Contact local utility for assistance.)
Compressor A1
L1___________
L2 ___________
L3 ___________
Compressor A2
L1___________
L2 ___________
L3 ___________
Compressor A3
L1___________
L2 ___________
L3 ___________
Compressor A4
L1___________
L2 ___________
L3 ___________
Compressor B1
L1___________
L2 ___________
L3 ___________
Compressor B2
L1___________
L2 ___________
L3 ___________
Compressor B3
L1___________
L2 ___________
L3 ___________
Compressor B4
L1___________
L2 ___________
L3 ___________
Supply Fan Amps (measured) L1___________
L2 ___________
L3 ___________
ComfortLink ___________
Exhaust Fan Amps
L1___________
L2 ___________
L3 ___________
ComfortLink ___________
Fan amp readings must be taken with a true RMS meter for accuracy
Fan amp reading must be taken with the fan running at 60 Hz.
Outdoor Fan Motor 1
L1___________
L2 ___________
L3 ___________
OFM 2
L1___________
L2 ___________
L3 ___________
OFM 3
L1___________
L2 ___________
L3 ___________
OFM 4
L1___________
L2 ___________
L3 ___________
OFM 5
L1___________
L2 ___________
L3 ___________
OFM 6
L1___________
L2 ___________
L3 ___________
Summary of Contents for WeatherExpert 48N2
Page 135: ...135 Fig 18 48 50N Typical Power Schematic Nominal 075 Ton Unit Shown ...
Page 136: ...136 Fig 19 48 50N Typical Power Schematic Nominal Ton 90 150 Units Shown ...
Page 137: ...137 Fig 20 48 50N Main Base Board Input Output Connections ...
Page 138: ...138 Fig 21 48 50N RXB EXB CEM Input Output Connections a48 9307 ...
Page 139: ...139 Fig 22 48 50N EXV SCB Input Output Connections a48 9308 ...
Page 140: ...140 Fig 23 48N Typical Modulating Gas Heat Unit Control Wiring ...
Page 141: ...141 Fig 24 50N Typical Electric Heat Unit Control Wiring ...
Page 144: ...144 Fig 27 48N Typical Gas Heat Section Wiring Nominal Ton 120 to 150 Units ...
Page 145: ...145 Fig 28 48 50N Typical Power Component Control Wiring 460 v ...
Page 146: ...146 Fig 29 48 50N Component Control Wiring 575 v Nominal Ton 075 to 150 Units ...
Page 147: ...147 Fig 30 48 50N Component Arrangement Power Box ...
Page 148: ...148 Fig 31 48 50N Component Arrangement Control Box ...
Page 240: ...240 APPENDIX D VFD INFORMATION CONT Fig G VFD Bypass Wiring Diagram WHEN USED ...