Carrier WeatherExpert 48N2 Controls, Start-Up, Operation, Service, And Troubleshooting page 258

Verify routing and installation of field control wiring per installation instructions
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Verify proper connection of optional CCN or BACnet wiring per installation instructions
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(Temporarily disconnect this wiring for start-up; reconnect once unit is started)
Verify proper installation of plenum rated pneumatic pressure tubing to building pressure and supply fan static pressure transducers
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per installation instructions
Verify that all pencil-type thermistors are fully inserted into corresponding wells
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Check gas piping for leaks (48N only) and correct as needed
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Verify installation of combustion air inlet hoods and flue outlets per installation instructions
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Verify installation of supply air thermistors per installation instructions (units with modulating gas, SCR electric or hydronic
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heat only)
Verify that return-air filters and outdoor-air filters are in place and clean
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Verify that unit is level within specified installation tolerances
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Verify that fan wheels and propellers are properly positioned in the fan housing/orifice, and that all fan set screws are tight
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Verify that fan bearing hold-down bolts and bearing race set screws are tight
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Verify that fan sheaves are aligned and belts are properly tensioned
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Verify that optional suction, discharge, and liquid service valves on each circuit are open
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Verify that compressor crankcase heaters have been energized and functioning for 24 hours. (Caution: heaters will be hot to the

touch; take precautions to avoid burns.)
Signature __________________________________________________________________ Date ___________________________
CL-2