CyberOne EC DX IOM Manual
4.0
MAINTENANCE
4.1
Periodic General Maintenance
Systematic, periodic general maintenance of the CyberOne
EC unit is required for optimum system 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 belt tension,
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.
WARNINGS
This equipment should be serviced and repaired by
a journeyman or a qualified refrigeration technician
only.
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
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.
Turn off power to the unit unless you are performing
tests that require power. With power and controls
energized, the unit could begin operating
automatically at any time. To prevent personal
injury, stay clear of rotating components as
automatic controls may start them unexpectedly.
Always recover all refrigerant prior to any system
repairs, failure to do so may result in system over
pressurization and rupture.
4.1.1
CyberOne EC DX 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 2.8.8.1.
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 be checked at least monthly and replaced as required.
Conditions of spaces vary and air filters should be checked
based on those conditions.
4.1.1.2
EC Fan
Periodic checks of the EC fan system 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
Inspect the drain pan on a monthly basis to ensure proper
drainage. Ensure the drain pan outlet is always free of debris
and the drain pan does not leak.
4.1.1.4
Coils
Coil(s) should be inspected semi-annually 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.
4.1.1.6
Humidifier
4.1.1.7
The steam cylinder has a limited lifetime and
must be replaced periodically. Because water conditions and
humidifier usage rates vary greatly, it is difficult to
establish intervals for
32
