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Computer Room HVAC - Scope of Services - Air Conditioning Systems

Annual Service, Major

EVAPORATOR
Visual inspection and check:

  • Amps.
  • Volts.
  • General condition of heaters, relays, and contactors.

Electric reheat should operate under low load conditions or during dehumidification to offset sensible cooling. 

CONDENSER – WATER COOLED
Visual inspection and check:

  • Water regulating valve. 
  • Make sure valve shuts off soon after unit shuts off.  
  • Install high side gauge and check head pressure.  
  • Make sure valve is maintaining pressure as it should, equal to 105°F.

CONDENSER – AIR COOLED
Visual inspection and check:

  • Coil, clean as required. 
  • For refrigerant leaks.  
  • Condition of fins.

Determine the type of low ambient control being utilized, and verify the operation maintains proper head pressure during low ambient operation. Check the secondary fan outdoor temp cut-in, cut-out settings.

Power wash coils: if possible remove any paper, leaves, and debris within four feet of the condensers.

DRY COOLER / GLYCOL CONDENSER
Visual inspection and check:

  • Coil, clean as required.
  • Glycol leaks.  
  • Fan controls and general condition. 
  • Verify glycol freeze point.

If the associated units have the Econo-Cool option the recommend out door fan settings is 50 degrees for a single fan system, 50 and 54 degrees for systems with multiple fans.

HUMIDIFIER SYSTEM INFRARED AND STEAM
Visual inspection and check:

  • If the microprocessor has the function record the run hours. 
  • Make sure all infrared bulbs are in operating condition. 
  • Clean the humidifier pan, as required. 
  • Steam canister condition and operation.
  • Inlet water, drain solenoid, and the water feed line.  
  • If automatic water flush system is used to prevent mineral deposits, check timer operation.

Turn setting above humidity point in room, unit relays or contactors should energize. 

REHEAT AND DEHUMIDIFICATION
Visual inspection and check:

  • Amps.
  • Volts.
  • General condition of heaters, relays, and contactors.

Electric reheat should operate under low load conditions or during dehumidification to offset sensible cooling. 

SEMI-HERMETIC COMPRESSOR
Visual inspection and check:

  • Verify the compressor integrity (perform pump down test). 
  • Use Megometer to determine the condition of the compressor windings. 
  • Oil level by viewing the sight glass should show 1/3 to 1/2 full.
  • Condition of un-loader in head of compressor for refrigerant leaks.
  • Compressor amps with compressor both un-loaded and loaded.
  • Superheat at compressor.

CONTROLS
Visual inspection and check:

  • Micro temperature and sensitivity parameters, and adjust to verify the operation of the reheats and mechanical cooling and Econo-
  • Cooling operation.
  • Operation of the components contactors, and check contacts for pitting and burning.
  • Operation of all relays, and make sure all contacts make or break when voltage is applied to the coil.
  • Ensure microprocessor and solid state control system is functioning properly.  Check alarm and status functions.
  • All electric terminals for tightness with power off (using a voltmeter), and check voltage all units, should be +10% of nameplate.
  • Operation of pressure switch.  
    • Low pressure switch.
    • High pressure switch. 
    • Check relief to make sure setting is higher than high pressure control.  
    • Ensure microprocessor and solid state control system is functioning properly.  Check alarm set points and status functions.

REFRIGERANT – CIRCUIT
Visual inspection and check:

  • System for oil or refrigerant leaks. 
  • Refrigerant sight glass moisture indicator.  
  • Check super heat and record.

Use refrigeration gauges to monitor suction and discharge record pressure.

FAN AND FAN DRIVES
Visual inspection and check:

  • Before lubrication, check bearings for noise and excessive wear, then lubricate fan and motor bearings.  Install grease fittings if not supplied with unit.
  • Motor housing and switches on single phase motor.  
  • Motor housing both for tightness, and tighten to motor base.  
  • Belt condition for tightness, and adjust or replace as needed.
  • Drives and pulleys for tightness and excessive wear.  
  • Alignment of pulleys.

FILTERS

  • Check filters.
  • Replace air filters as required.

Documentation of inspection with recommendations for any corrective action deemed necessary will be provided.

Semi-Annual Service, Minor

EVAPORATOR
Visual inspection and check:

  • Dust and corrosion.
  • Evaporator condition.
  • Refrigerant leaks.
  • Drain lines for obstructions and corrosion.

INTERNAL CONDENSER – GLYCOL / WATER COOLED
Visual inspection and check:

  • Water regulating valve. 
  • Refrigerant leaks at valve bellows. 
  • System pressures. 
  • Make sure regulating valve is maintaining refrigerant pressure within the manufactures specifications.

CONDENSER – AIR COOLED
Visual inspection and check:

  • Coil, clean as required during annual inspection.
  • For refrigerant leaks.  
  • Overall Condition of the coil, refrigerant piping, electrical components, and wiring.

Determine the type of low ambient control being utilized, and verify the operation maintains proper head pressure during low ambient operation. Check the secondary fan outdoor temp cut-in, cut-out settings.

DRY COOLER / GLYCOL CONDENSER
Visual inspection and check:

  • Coil, clean as required.
  • Glycol leaks.  
  • Fan controls. 
  • Verify glycol freeze point.
  • Overall Condition of the condenser, coil, glycol piping, electrical components, and wiring.

If the associated units have the econo-cool option the recommend out door fan settings is 50 degrees for a single fan system, 50 and 54 degrees for systems with multiple fans.

HUMIDIFIER SYSTEM INFRARED AND STEAM
Visual inspection and check:

  • If the microprocessor has the function, complete operation and record the run hours. 
  • Make sure all infrared bulbs are in operating condition. 
  • Clean the humidifier pan, as required. 
  • Steam canister condition and operation.
  • Inlet water, drain solenoid, and the water feed line.  
  • If automatic water flush system is used to prevent mineral deposits, check timer operation
  • Condensate pump operation, clean and flush as required

Turn setting above humidity point in room, unit relays or contactors should energize.

REHEAT AND DEHUMIDIFICATION
Visual inspection and check:

  • Amps.
  • Volts.
  • General condition of heaters, relays, and contactors.

Electric reheat should operate under low load conditions or during dehumidification to offset sensible cooling.   

SEMI-HERMETIC COMPRESSOR
Visual inspection and check:

  • Verify the compressor integrity (pump down test).  Closing liquid line: service valve or suction service valve, run compressor, and pull system into 5” vacuum it should be able to hold the vacuum.
  • Use Mego-Meter to determine the condition of the compressor windings. 
  • Oil level by viewing the sight glass should show 1/3 to 1/2 full.
  • Check the compressor un-loader for refrigerant leaks.
  • Compressor amps with compressor both un-loaded and loaded.
  • Superheat at compressor.

CONTROLS
Visual inspection and check:

  • Micro temperature and sensitivity parameters, and adjust to verify the operation of the reheats and mechanical cooling and econo-cooling operation.
  • Operation of the components contactors, and check contacts for pitting and burning.
  • Operation of all relays, and make sure all contacts make or break when voltage is applied to the coil.
  • Ensure microprocessor and solid state control system is functioning properly.  Check alarm and status functions.
  • All electric terminals for tightness with power off (using a voltmeter), and check voltage all units, should be +10% of nameplate.
  • Operation of pressure switch.  
    • Low pressure switch.
    • High pressure switch. 
    • Check relief to make sure setting is higher than high pressure control. 

REFRIGERANT – CIRCUIT
Visual inspection and check:

  • System for oil or refrigerant leaks. 
  • Refrigerant sight glass moisture indicator. 

Use refrigeration gauges to monitor suction and discharge, and verify superheat and TXV valve are operational.

FAN AND FAN DRIVES
Visual inspection and check:

  • Before lubrication, check bearings for noise and excessive wear, then lubricate fan and motor bearings.  Install grease fittings if not supplied with unit (if applicable).
  • Motor housing and switches on single phase motor.  
  • Motor housing both for tightness, and tighten to motor base.  
  • Belt condition for tightness, and adjust or replace as needed.
  • Drives and pulleys for tightness and excessive wear.  
  • Alignment of pulleys.

FILTERS

  • Replace air filters as required.

Documentation of inspection with recommendations for any corrective action deemed necessary will be provided.

Quarterly Service, Minor

EVAPORATOR
Visual inspection and check:

  • Dust and corrosion.
  • Evaporator condition.
  • Refrigerant leaks.
  • Drain lines for obstructions and corrosion.

INTERNAL CONDENSER – GLYCOL / WATER COOLED
Visual inspection and check:

  • Water regulating valve. 
  • Refrigerant leaks at valve bellows 
  • System pressures.  
  • Make sure regulating valve is maintaining refrigerant pressure within the manufactures specifications. 

CONDENSER – AIR COOLED
Visual inspection and check:

  • Coil, clean as required.
  • For refrigerant leaks.  
  • Overall condition of the coil, refrigerant piping, electrical components, and wiring.

Determine the type of low ambient control being utilized, and verify the operation maintains proper head pressure during low ambient operation. Check the secondary fan outdoor temp cut-in, cut-out settings.

DRY COOLER / GLYCOL CONDENSER
Visual inspection and check:

  • Coil, clean as required.
  • Glycol leaks.  
  • Fan controls. 
  • Verify glycol freeze point.
  • Overall condition of the condenser, coil, glycol piping, electrical components, and wiring.

If the associated units have the econo-cool option the recommend out door fan settings is 50 degrees for a single fan system, 50 and 54 degrees for systems with multiple fans.

HUMIDIFIER SYSTEM INFRARED AND STEAM
Visual inspection and check:

  • If the microprocessor has the function, complete operation and record the run hours. 
  • Make sure all infrared bulbs are in operating condition. 
  • Clean the humidifier pan, as required. 
  • Steam canister condition and operation.
  • Inlet water, drain solenoid, and the water feed line.  
  • If automatic water flush system is used to prevent mineral deposits, check timer operation.
  • Condensate pump operation, clean and flush as required

Turn setting above humidity point in room, unit relays or contactors should energize.

REHEAT AND DEHUMIDIFICATION
Visual inspection and check:

  • Amps.
  • Volts.
  • General condition of heaters, relays, and contactors.

Electric reheat should operate under low load conditions or during dehumidification to offset sensible cooling. 

SEMI-HERMETIC COMPRESSOR
Visual inspection and check:

  • Verify the compressor integrity (pump down test). 
  • Use Mego-Meter to determine the condition of the compressor windings. 
  • Oil level by viewing the sight glass should show 1/3 to 1/2 full.
  • Check the compressor un-loader for refrigerant leaks.
  • Compressor amps with compressor both un-loaded and loaded.
  • Superheat at compressor.

CONTROLS
Visual inspection and check:

  • Micro temperature and sensitivity parameters, and adjust to verify the operation of the reheats and mechanical cooling and econo-cooling operation.
  • Operation of the components contactors, and check contacts for pitting and burning.
  • Operation of all relays, and make sure all contacts make or break when voltage is applied to the coil.
  • Ensure microprocessor and solid state control system is functioning properly.  Check alarm and status functions.
  • All electric terminals for tightness with power off (using a voltmeter), and check voltage all units, should be +10% of nameplate.
  • Operation of pressure switch.  
  • Low pressure switch.
  • High pressure switch. 
  • Check relief to make sure setting is higher than high pressure control. 

REFRIGERANT – CIRCUIT
Visual inspection and check:

  • System for oil or refrigerant leaks. 
  • Refrigerant sight glass moisture indicator. 

Use refrigeration gauges to monitor suction and discharge, and verify superheat and TXV valve are operational.

FAN AND FAN DRIVES
Visual inspection and check:

  • Before lubrication, check bearings for noise and excessive wear, then lubricate fan and motor bearings.  Install grease fittings if not supplied with unit (if applicable).
  • Motor housing and switches on single phase motor.  
  • Motor housing both for tightness, and tighten to motor base.  
  • Belt condition for tightness, and adjust or replace as needed.
  • Drives and pulleys for tightness and excessive wear.  
  • Alignment of pulleys.

FILTERS
Visual inspection and check:

  • Filters
  • Replace air filters as required.

Documentation of inspection with recommendations for any corrective action deemed necessary will be provided.

MonthlyService, Minor

EVAPORATOR
Visual inspection and check:

  • Dust and corrosion.
  • Evaporator condition.
  • Refrigerant leaks.
  • Drain lines for obstructions and corrosion.

INTERNAL CONDENSER – GLYCOL / WATER COOLED
Visual inspection and check:

  • Water regulating valve. 
  • Refrigerant leaks at valve bellows 
  • System pressures.  
  • Make sure regulating valve is maintaining refrigerant pressure within the manufactures specifications.

CONDENSER – AIR COOLED
Visual inspection and check:

  • Coil, clean as required during annual inspection.
  • Inspect for refrigerant leaks.  
  • Overall Condition of the coil, refrigerant piping, electrical components and wiring.

Determine the type of low ambient control being utilized, and verify the operation maintains proper head pressure during low ambient operation. Check the secondary fan outdoor temp cut-in, cut-out settings.

DRY COOLER / GLYCOL CONDENSER
Visual inspection and check:

  • Coil, clean as required.
  • Glycol leaks.  
  • Fan controls. 
  • Verify glycol freeze point.
  • Overall condition of the condenser, coil, glycol piping, electrical components, and wiring.

HUMIDIFIER SYSTEM INFRARED AND STEAM
Visual inspection and check:

  • If the microprocessor has the function, record the run hours. 
  • Make sure all infrared bulbs are in operating condition. 
  • Clean the humidifier pan, as required. 
  • Steam canister condition and operation.
  • Inlet water, drain solenoid, and the water feed line.  
  • If automatic water flush system is used to prevent mineral deposits, check timer operation.
  • Condensate pump operation, clean and flush as required.

REHEAT AND DEHUMIDIFICATION
Visual inspection and check:

  • General condition of heaters, relays, and contactors.

Electric reheat should operate under low load conditions or during dehumidification to offset sensible cooling.   

SEMI-HERMETIC COMPRESSOR
Visual inspection and check:

  • Verify the compressor operation. 
  • Oil level by viewing the sight glass should show 1/3 to 1/2 full.
  • Check the compressor un-loader for refrigerant leaks.
  • Compressor amps with compressor both un-loaded and loaded.

REFRIGERANT – CIRCUIT
Visual inspection and check:

  • System for oil or refrigerant leaks. 
  • Refrigerant sight glass moisture indicator. 

CONTROLS
Visual inspection and check:

  • Micro temperature and sensitivity parameters, and adjust to verify the operation of the reheats and mechanical cooling and Econo-Cooling operation.
  • Operation of the components contactors, and check contacts for pitting and burning.
  • Operation of all relays, and make sure all contacts make or break when voltage is applied to the coil.
  • Ensure microprocessor and solid state control system is functioning properly.  Check alarm and status functions.
  • All electric terminals for tightness with power off (using a voltmeter), and check voltage all units, should be +10% of nameplate.

FAN AND FAN DRIVES
Visual inspection and check:

  • Bearings for noise and excessive wear.
  • Motor. 
  • Belt condition for tightness, and adjust or replace as needed.
  • Drives and pulleys for tightness and excessive wear. 

FILTERS
Visual inspection and check:

  • Air filters.

Documentation of inspection with recommendations for any corrective action deemed necessary will be provided.
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