CyberAiR DX Floor Mounted IOM
4.0
MAINTENANCE
4.1
Periodic General Maintenance
Systematic, periodic general maintenance of the
STULZ CyberAir system is recommended for
optimum performance. General maintenance should
include, but is not limited to the following: replacing
filters and humidifier cylinders, tightening electrical
connections, checking the condensate drain line to
ensure it is free of debris, cleaning the interior of the
unit, inspecting the units’ components visually,
checking level of refrigerant and ensuring no
moisture is in the refrigerant.
Use copies of the Periodic General Maintenance
Checklist in this manual (see Appendix A) to record
periodic general maintenance inspections. For
assistance, contact STULZ Product Support. Ensure
adherence to all safety statements while performing
any type of maintenance.
WARNING
This equipment should be serviced and repaired by a
journeyman or a qualified refrigeration technician
only.
WARNING
This unit employs high voltage equipment with
rotating components. Exercise extreme care to avoid
accidents and ensure proper operation.
Hazardous voltage will still be present inside the
electric box at the motor start protectors and at the
heater and humidifier circuit breakers, even with the
unit turned off at the microprocessor controller. To
isolate the unit for maintenance, turn off power at the
main power disconnect switch. Always disconnect
main power prior to performing any service or repairs.
WARNING
Turn off power to the unit unless you are performing
tests that require power. With power and controls
energized, the unit could begin operating at any time.
To prevent personal injury, stay clear of rotating
components as automatic controls may start them
unexpectedly.
4.1.1 Precision A/C Unit
Check the refrigerant sight glass on a monthly
basis while the unit is running and ensure it is free
of bubbles. Bubbles in the sight glass indicate a
low
refrigerant charge or a clogged filter-drier. Check for
humidity in the refrigerant by viewing the color of the
indicator in the center of the sight glass and
comparing it to the color scale on the outer ring. If
humidity is present, the system must be evacuated
and recharged.
Check the superheat and sub-cooling temperatures
semi-annually and ensure they are within the range
shown in the refrigerant pressure/temperature table
in Section 2.9.6. If necessary, adjust the refrigerant
charge to achieve the correct values. If the
refrigerant level is low, check the system for leaks.
4.1.1.1 Air Filter
The air filter is usually the most neglected item in an
air conditioning system. To maintain efficient
operation, the filter should initially be checked at
least monthly and replaced as required.
NOTE
Conditions of spaces vary and the frequency
of checking air filters should be based on
those conditions.
4.1.1.2 Fans
Periodic checks of the EC fans should include
checking the wiring, fan motor mounts, housing and
impeller wheel. Ensure all electrical connections are
tight. Check that all mounts are secure and the
impeller wheel is tightly mounted. The impeller blades
should be kept free of debris.
4.1.1.3 Drain Pan
To ensure proper drainage, inspect the drain pan
regularly. Make sure the drain pan outlets are always
free of debris and ensure the drain pan does not
leak.
4.1.1.4 Coils
The coil(s) should be inspected semiannually and
cleaned as required following standard coil cleaning
practices. Using a brush, clean the coil fins of all
debris that will inhibit airflow. This can also be done
with compressed air or with a commercial coil
cleaner.
Check for bent or damaged coil fins and repair as
necessary. Check all refrigerant lines and capillaries
for vibration isolation and support as necessary.
Check all piping for signs of leaks.
4.1.1.5 Heat/Reheat
The heat/reheat equipment should be inspected
semi- annually to ensure it is operational. If you have
electric heat/reheat, inspect the heating elements to
ensure they are free of debris.
4-1
