CRAC Maintenance Checklist.pdf

Monthly Inspections CRAC Units

Assembly / component Maintenance task Monthly

Humidifier Check for contamination and correct functionality. Check correct operation. x

Fan Check smoothness of fan operation x Check motor bearing for noises x

Cooling circuit Check smoothness of compressor operation x Check pipes for traces of oil (leaks) x

Heat exchanger Check pumped cold water heat exchanger for contamination on the lamella x

Condensate transfer pump Check filter, container and float-actuator switch for contamination x Condensate discharge Unscrew the ball non-return siphon and check for contamination x

Quarterly and Annual Inspections CRAC Units

Assembly / component Maintenance task Quarterly Annual

Fan Check the motor circuit-breaker combination x Air filter Check level of contamination and replace, if necessary x

Check filter and filter support for leaks x Check filter monitoring x

Cooling circuit Measure temperature of the pressure line x Measure temperature of the extraction line; visual check of collar x Measure overheating, undercooling and evaporation/condensation temperature x Check high-pressure and low-pressure switch x Check pressure control of the condenser fan x Check coolant for bubbles in the inspection glass under full load x Examine coolant-carrying parts for traces of oil x Examine coolant-carrying parts for leaks x

Multi-leaf dampers Check that axles are fixed in the servo motors and check for smooth axle movement. Control direction correct? x

Supply and disposal lines Check all flexible connections for leaks x

Clean all condensate discharges, including the siphon x Check functionality of all condensate discharges, including thesiphon x

Clean all trays x Check and clean dirt trap x

Electric heater Safety thermostat on the electric heater: Check functionality x Electric unit/control unit/controller Check all fuses x

Check functionality of guards and relays x Check connection clamps and signal lights x Set limits OK? x

Determine actual temperature and humidity values and comparewith setpoints x Housing Clean inside of unit x

Humidifier

Clean inlet and drainage valves, drainage channel and internal parts; check drainage lines including the siphon, plus all hoses and electrical lines.

x

Check for contamination and correct functionality. If necessary, replace the cylinder and reset the maintenance display.

x

Check functionality and calcification of steam lance and condensate discharge.

x

Fan Clean fan impellor x Check power consumption of the drive motor x

Cooling circuit Measure power consumption of the compressor at the maximum permissible operating pressure x

Check filter dryer for icing and replace, if necessary x Check functionality of expansion valve and injection x