Components

ROOFTOP HVAC

COMPONENT

FUNCTION

MAINTENANCE

ELECTRICAL DISCONNECT
  • Provides primary electrical power safety shutoff.
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  • Inspect contacts and loose connections.
  • Check for proper operation.

    • CONDENSER FAN MOTOR
  • Provides energy source for fan.
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  • Perform vibration test.
  • Lubricate bearings.
  • Examine motor mount resiliency.
  • Check motor insulation resistance.

    • MOTOR STARTER
  • Controls on/off operation of motor.
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  • Inspect starter coils and contacts.
  • Tighten all electrical connections.
  • Check operating current, voltage and heater size.

    • CONDENSER FAN
  • Circulates air through condenser coil
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  • Check fan wheel and clean dirt accumulation.
  • Lubricate bearings and check for end play, excessive bearing temp and wear.
  • Check condition of drive couplings and belts.
  • Adjust as required.
  • Check for corrosion and wear.

    • CONDENSER COIL
  • Converts refrigerant from high temp/high pressure gas to low temp/high pressure liquid.
  • Provides efficient heat transfer.
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  • Clean finned surfaces.
  • Check for damage or leaks.
  • Straighten bent fins.

    • REFRIGERATION CONTROL PANEL
  • Provides safety interlocks and controls for compressor operation.
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  • Sequence test all controls.
  • Calibrate and clean controllers and safety controls.
  • Check setpoint of controls and limits.

    • REFRIGERATION COMPRESSOR
  • Prepares refrigerant to be condensed and reused at the evaporator.
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  • Check crankcase heater operation.
  • Check refrigerant charge.
  • Check for refrigerant and oil leaks.
  • Check oil level and condition.
  • Perform acid test.
  • Observe bearing and operating surface temperatures.
  • Measure vibration.

    • ZONE CONTROL ACTUATORS
  • Operates zone dampers on demand from space control.
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  • Inspect, clean and calibrate.
  • Adjust linkage as necessary.

    • COOLING COIL
  • Provides cooling for space being served.
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  • Inspect and clean as required.
  • Check condition of finned surfaces and straighten if bent.
  • Check for corrosion and leaks.

    • FILTER SECTION
  • Provides source of clean air for unit.
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  • Replace media as required.

    • FRESH AIR DAMPER
  • Provides source of outside air.
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  • Check for unrestricted and proper operation and close-off.
  • Lubricate bearings as required.

    • RETURN AIR DAMPER
  • Provides source of recirculated air from the building.
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  • Check for unrestricted and proper operation and close-off.
  • Lubricate bearings as required.

    • EXHAUST AIR DAMPER
  • Provides outlet for exhausted air from building.
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  • Check for unrestricted and proper operation and close-off.
  • Lubricate bearings as required.

    • RETURN AIR FAN
  • Circulates return air from building.
    		•
  • Lubricate bearings and check for end play, excessive bearing temp. and wear.
  • Check blower and clean dirt accumulation.
  • Check condition of drive couplings and belts.

    • SUPPLY FAN
  • Circulates conditioned air to areas being served by unit.
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  • Check for alignment, balance and security to shaft.
  • Check rotation.

    • RETURN AIR FAN MOTOR
  • Provides energy source for return air fan
    		•
  • Perform vibration test.
  • Lubricate bearings.
  • Check motor isulation resistance.
  • Examine motor mount resiliency.

    • SUPPLY MOTOR
  • Provides energy source for main fan.
    		•
  • Same as above.

    • MOTOR STARTER
  • Controls on/off operation of motor.
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  • Inspect starter coils and contacts.
  • Tighten all electrical connections.
  • Check operating current, voltage and heater size.

    • BURNER SECTION
  • Provides combustion controls, fuel regulating equipment and safety controls for heating section.
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  • Perform combustion and draft tests.
  • Inspect and clean nozzles.
  • Inspect, clean and lube burner fan (gun type burners)
  • Test safety controls.

    • HEATING SECTION
  • Provides heat source for areas being served.
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  • Inspect and clean as required.
  • Check for leaks in echanger.

    • ZONE DAMPERS
  • Provides source for conditioned air being delivered to areas served by unit.
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