Start-Up Checklist - Carrier 50JZ024 Installation, Start-Up And Service Instructions Manual

SYMPTOM
Suction pressure too low
Compressor runs but outdoor fan does not
IFM does not run
IFM operation is intermittent
IFM—Indoor Fan Motor
I. PRELIMINARY INFORMATION
Model No...............................................................................................................................................................................................................
Serial No. ...............................................................................................................................................................................................................
Date ........................................................................................................................................................................................................................
Technician..............................................................................................................................................................................................................
II. PRE-START-UP
___ Verify that all packing materials have been removed from unit
___ Remove all shipping holddown bolts and brackets per installation instructions
___ Verify that condensate connection is installed per installation instructions
___ Check all electrical connections and terminals for tightness
___ Check that indoor (evaporator) air filter is clean and in place
___ Verify that unit installation is level
___ Check fan wheel and propeller for location in housing and setscrew tightness
III. START-UP
Supply Voltage: L1-L2 __________ L2-L3 _________ L3-L1 __________
Compressor Amps: L1 __________ L2 _________ L3 __________
Indoor Fan Amps: __________
AIR TEMPERATURE
Outdoor-Air Temperature: __________ DB
Return-Air Temperature: __________ DB __________ WB
Heat Pump Supply Air: __________
Electric Heater Supply Air: __________
REFRIGERANT PRESSURES AND TEMPERATURES
Refrigerant Suction __________ psig
Refrigerant Discharge __________ psig
Suction Line Temp*__________
Discharge Line Temp†__________
Liquid Line Temp‡__________
___ Verify refrigerant charge using charging tables
___ Verify 3-phase scroll compressor is rotating in correct direction.
* Measured at suction inlet to compressor.
† Measured at discharge outlet from compressor.
‡ Measured at liquid line leaving condenser.
Troubleshooting Chart (cont'd)
CAUSE
(Cool) Dirty air filter
(Heat) Outdoor coil frosted
Low refrigerant charge
Metering device or low side restricted
(Cool) Insufficient coil airflow
(Cool) Temperature too low in conditioned area
(Cool) Outdoor ambient below 40°F
Filter-drier restricted
NC (normally closed) contacts on defrost board
open
Blower wheel not secured to shaft
Insufficient voltage at motor
Power connectors not properly sealed
Water dripping into motor
Connectors not firmly sealed

START-UP CHECKLIST

(REMOVE AND STORE IN JOB FILE)
25
REMEDY
Replace filter
Move timer on control board to 30 minutes be-
tween defrost cycles
Check for leaks, repair and recharge
Remove source of restriction
Increase air quantity
Check filter—replace if necessary
Reset thermostat
Install low-ambient kit
Replace
Check condition of relay on board
Replace if necessary
Properly tighten blower wheel to shaft.
Determine cause and correct
Connectors should snap easily; do not force
Verify proper drip loops in connector wires
Gently pull wires individually to be sure they are
crimped into the housing