McQuay MLCV Guía para resolver problemas Pagina 43

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High Suction
Pressure
Excessive Fresh Air Intake
Evaporator Air
Inlet
Temperature
Insufficient Duct Insulation
Defective Compressor Valve
Reduce the fresh air intake
Reinforce the duct insulation
Change or repair the compressor
Low
Overcharged Refrigerant Purge the refrigerant
High Suction Pressure
Low Suction
Pressure
Clogged Air Filter
Evaporator
Air Inlet
Temperature
Evaporator
Air Flow
Restricted Duct
Low Fan Speed
Short Cycling
Faulty Thermostat
Restricted Liquid LIne And
Suction Line
Low Discharge Pressure
Clean the air filter
Remove the restriction
Adjust the fan speed
Remove obstacles to air circulation
Repair or replace if necessary
Restricted
Low
Low Refrigerant Charge Add refrigerant
See "Low Discharge Pressure"
Remove the restriction
Low Suction Pressure
High Discharge
Pressure
Clogged Condenser Coil
Condenser
Air Inlet
Temperature
Condenser
Air Flow
Low Fan Speed
Malfunction Of Fan Cycling
System
Circulating Air Flow
Overcharged Refrigerant
Non-Condensable Gas
High Suction Pressure
Clean the condenser
Check the voltage and get
the right voltage
Check the system and
repair if required
Secure space for required air flow
Purge the refrigerant
Restricted
High
Restricted Liquid Line
Purge the gas
Remove the restriction
See "High Suction Pressure"
High Discharge Pressure
41
Low Discharge Pressure
Low Discharge
Pressure
Malfunction Of Fan Cycling
System
Condenser
Air Flow
Low Refrigerant Charge
Low Ambient Temperature
Check the system and repair
the components if required
Add refrigerant
See the unit working range
Excessive
42
Diagnosis by flow chart (Cooling only)
The following charts are efficient checking procedures for troubleshooting when these fan-coil units
are combined with condensing units with the unit standard wiring. For dual circuited models, perform
the procedures for each circuit.
No Cooling
No Cooling ( Compressor Does Not Start )
No Voltage or Low Voltage
Unit Power
Supply
Evaporator
Fan Motor
Fuse For
Operation
Circuit
Single-Phase
Components Shorted
Connections Loose
Overcurrent
Relay For
Evaporator Fan
High Volage or Low Voltage
Single-Phase
Evaporator Fan
Contactor
Coil Burned
Contact Faulty
Get the right voltage
Repair the power line
Repair or replace the components
Tighten the connections
Get the right voltage
Check the power supply to the
motor : repair when necessary
Faulty Fan Motor
Defective Operation Switch
Change the contactor
Repair the contacts
Repair or change the motor
Repair or replace the switch
Condenser
Fan Motor
Overcurrent
Relay For
Condenser Fan
Condenser Fan
Contactor
Compressor
Contactor
High Voltage or Low Voltage
Single-Phase
Coil Burnt
Contact Faulty
Fan Motor Faulty
Other Electrical Component
Faulty
Coil Burnt
Contact Faulty
Open Compressor Windings
Incorrect Wiring
Get the right voltage
Change the contactor
Change the contacts
Repair or change the motor
Repair or change if necessary
Change the contactor
Repair the contacts
Change the compressor
Correct the wiring
Running
Stop
Tripped
Faulty
Faulty
Faulty
Tripped
Blown
Running
Faulty
Stop
: Faulty : Check : Cause Remedy
Check the power supply to the
motor : repair when necessary
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