Bryant EVOLUTION 577D, Руководство по установке

Страница: 33 / 36

33
Table 10— Troubleshooting Chart
SYMPTOM CAUSE REMEDY
Power failure Call power company
Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker
Defective contactor, transformer, control relay, or high--
Replace component
Defective contactor, transformer, control relay, or high
pressure, loss--of--charge or low--pressure switch
Replace component
Insufficient line voltage Determine cause and correct
Compressor and outdoor fan
will not start
Incorrect or faulty wiring Check wiring diagram and rewire correctly
will not start
UI setting too low/too high Reset UI setting
DO NOT bypass this compressor time
Units have a 5--minute time delay
DO NOT bypass this compressor time
delay–wait for 5 minutes until time--delay
relay is de energized relay is de--energized
Faulty wiring or circuit
Loose connections in compressor
Check wiring and repair or replace
Compressor will not start but condenser fan
Compressor motor burned out, seized, or Determine cause
Compressor will not start but condenser fan
runs
internal overload open Replace compressor
runs
Defective run capacitor, overload, or PTC (positive
temperature coefficient) thermistor
Determine cause and replace
Low input voltage (20 percent low) Determine cause and correct
Refrigerant overcharge or undercharge
Recover refrigerant, evacuate system, and re-
charge to capacities shown on rating plate
Defective compressor Replace and determine cause
Compressor cycles (other than normally sat-
Insufficient line voltage Determine cause and correct
Compressor cycles (other than normally sat
isfying) cooling/heating calls
Blocked outdoor coil Determine cause and correct
isfying) cooling/heating calls
Blocked outdoor coil Determine cause and correct
y g) g/ g
Defective run/start capacitor, overload or start relay Determine cause and replace
Faulty outdoor fan motor or capacitor Replace
Restriction in refrigerant system Locate restriction and remove
Dirty air filter Replace filter
Unit undersized for load Decrease load or increase unit size
UI temperature set too low Reset UI setting
Compressor operates continuously Low refrigerant charge Locate leak, repair, and recharge Co p esso ope ates co t uous y
Air in system
Recover refrigerant, evacuate system, and re-
charge
Outdoor coil dirty or restricted Clean coil or remove restriction
Dirty air filter Replace filter
Dirty indoor or outdoor coil Clean coil
Excessive head pressure
Refrigerant overcharged Recover excess refrigerant
Excessive head pressure
Air in system
Recover refrigerant, evacuate system, and re-
charge
Indoor or outdoor air restricted or air short--cycling Determine cause and correct
Head pressure too low
Low refrigerant charge Check for leaks, repair and recharge
Head pressure too low
Restriction in liquid tube Remove restriction
High heat load Check for source and eliminate
Excessive suction pressure Reversing valve hung up or leaking internally Replace valve Excessive suction pressure
Refrigerant overcharged Recover excess refrigerant
Dirty air filter Replace filter
Low refrigerant charge Check for leaks, repair and recharge
Metering device or low side restricted Remove source of restriction
Suction pressure too low Insufficient coil airflow Check filter–replace if necessary Suct o p essu e too o
Temperature too low in conditioned area Reset UI setting
Outdoor ambient below 55
°
F Verify low--ambient cooling enabled in UI
Filter drier restricted Replace
Blower wheel not secured to shaft Properly tighten blower wheel to shaft
IFM does not run Insufficient voltage at motor Determine cause and correct does ot u
Power connectors not properly sealed Connectors should snap easily; do not force
Water dripping into motor Verify proper drip loops in connector wires
IFM operation is intermittent
Connectors not firmly sealed
Gently pull wires individually to be sure they are
crimped into the housing
577D