Nibe Climate Master RGED Series, Руководство по установке

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N. DIAGNOSTICS
N.1. Diagnostics Chart
N.1.1.Cooling Diagnostics Chart
WARNING
!
DISCONNECT ALL POWER TO UNIT BEFORE SERVICING. CONTACTOR MAY BREAK ONLY ONE SIDE. FAILURE
TO SHUT OFF POWER CAN CAUSE ELECTRICAL SHOCK RESULTING IN PERSONAL INJURY OR DEATH.
SYMPTOM POSSIBLE CAUSE REMEDY
Unit will not run
• Power off or loose electrical connection
• Thermostat out of calibration-set too high
• Defective contactor
• Blown fuses
• Transformer defective
• High pressure control open (if provided)
• Interconnecting low voltage wiring damaged • Check for correct voltage at compressor contactor in control box
• Reset
• Check for 24 volts at contactor coil - replace if contacts are open
• Replace fuses
• Check wiring-replace transformer
• Reset-also see high head pressure remedy-
• Replace thermostat wiring"
Condenser fan runs, compressor
doesn’t
• Run capacitor defective (single phase only)
• Loose connection
• Compressor stuck, grounded or open motor winding
open internal overload.
• Low voltage condition
• Replace
• Check for correct voltage at compressor - check & tighten all
connections
• Wait at least 2 hours for overload to reset. If still open, replace the
compressor.
At compressor terminals, voltage must be within 10% of rating
plate volts when unit is operating."
Insufficient cooling
• Improperly sized unit
• Improper airflow
• Incorrect refrigerant charge
• Air, non-condensibles or moisture in system
• Incorrect voltage
• Recalculate load
• Check - should be approximately 400 CFM [188.78 L/s] per ton.
• Charge per procedure attached to unit service panel.
• Recover refrigerant, evacuate & recharge, add filter drier
• At compressor terminals, voltage must be within 10% of rating
plate volts when unit is operating."
Compressor short cycles
• Incorrect voltage
• Defective overload protector
• Refrigerant undercharge
• At compressor terminals, voltage must be ± 10% of nameplate
marking when unit is operating.
• Replace - check for correct voltage
• Add refrigerant
Registers sweat
• Low evaporator airflow
• Room thermostat set too low • Increase speed of blower or reduce restriction - replace air filter
• Raise thermostat set point
High head-low vapor pressures
• Restriction in liquid line, expansion device or filter drier
• Flow check piston size too small
• Incorrect capillary tubes • Remove or replace defective component
• Change to correct size piston
• Change coil assembly
High head-high or normal vapor
pressure - Cooling mode
• Dirty condenser coil
• Refrigerant overcharge
• Condenser fan not running
• Air or non-condensibles in system • Clean coil
• Correct system charge
• Repair or replace
• Recover refrigerant, evacuate & recharge
High head-high or normal vapor
pressure - Heating mode
• Low air flow - condenser coil
• Refrigerant overcharge
• Air or non-condensibles in system
• Dirty condenser coil • Check filters - correct to speed
• Correct system charge
• Recover refrigerant, evacuate & recharge
• Check filter - clean coil
Low head-high vapor pressures • Defective Compressor valves • Replace compressor
Low vapor - cool compressor - iced
evaporator coil
• Low evaporator airflow
• Operating below 65°F outdoors
• Moisture in system
• Liquid line limiting refrigerant flow • Increase speed of blower or reduce restriction - replace air filter
• Add Low Ambient Kit
• Recover refrigerant - evacuate & recharge - add filter drier
• Replace drier
High vapor pressure
• Excessive load
• Defective compressor • Recheck load calculation
• Replace
Fluctuating head & vapor pressures
• Severe overcharge
• Air or non-condensibles in system • Adjust refrigerant charge
• Recover refrigerant, evacuate & recharge
Gurgle or pulsing noise at expansion
device or liquid line
• Air or non-condensibles in system • Recover refrigerant, evacuate & recharge