IOM 1206-7 • TRAILBLAZER
™
MODEL AGZ CHILLERS
96 www.DaikinApplied.com
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General
On initial start-up and periodically during operation, it will
be necessary to perform certain routine service checks.
Among these are checking the liquid line sight glasses, taking
condensing and suction pressure readings, and checking
to see that the unit has normal superheat and subcooling
readings. A recommended maintenance schedule is located at
the end of this section.
Evaporator
The evaporators are brazed plate design. Other than cleaning
and testing, no service work should be required on the
evaporator.
Compressor Maintenance
The scroll compressors are fully hermetic and require no
maintenance other than checking oil level.
Lubrication
No routine lubrication is required on AGZ units. The fan motor
bearings are permanently lubricated and no further lubrication
is required. Excessive fan motor bearing noise is an indication
of a potential bearing failure.
POE type oil is used for compressor lubrication. Further details
are listed in the Unit Service section on
page 100
.
WARNING
POE oil must be handled carefully using proper protective
equipment (gloves, eye protection, etc.) The oil must not come
in contact with certain polymers (e.g. PVC), as it may absorb
moisture from this material. Also, do not use oil or refrigerant
additives in the system.
All-Aluminum Condenser Coils
The condenser coils are an all-aluminum design including the
connections, microchannels, fins (an oven brazing process
brazes the fins to the microchannel flat tube), and headers
(see
“Microchannel Coil Cross Section”)
, which eliminates
the possibility of corrosion normally found between dissimilar
metals of standard coils.
During the condensing process, refrigerant in the coil passes
through the microchannel flat tubes, resulting in higher
efficiency heat transfer from the refrigerant to the airstream. In
the unlikely occurence of a coil leak, contact Daikin Applied to
receive a replacement coil module.
Figure 68: Microchannel Coil Cross Section
Cleaning Microchannel Aluminum Coils
Maintenance consists primarily of the routine removal of dirt
and debris from the outside surface of the fins.
Cleaning ElectroFin® Coated Coils
The following cleaning procedures are recommended as part
of the routine maintenance activities for ElectroFin Coated
Coils. Documented routine cleaning of ElectroFin Coated
Coils is required to maintain warranty coverage. The cleaning
procedure can be downloaded from the ElectroFin web site
www.luvata.com/electrofin, click on Procedures for Cleaning.
WARNING
Prior to cleaning the unit, turn off and lock out the main power
switch to the unit and open all access panels.
Remove Surface Loaded Fibers
Surface loaded fibers or dirt should be removed prior to water
rinse to prevent further restriction of airflow. If unable to back
wash the side of the coil opposite that of the coils entering air
side, then surface loaded fibers or dirt should be removed with
a vacuum cleaner. If a vacuum cleaner is not available, a soft
non-metallic bristle brush may be used. In either case, the tool
should be applied in the direction of the fins. Coil surfaces can
be easily damaged (fin edges bent over) if the tool is applied
across the fins.
NOTE:
Use of a water stream, such as a garden hose,
against a surface loaded coil will drive the fibers and
dirt into the coil. This will make cleaning efforts more
difficult. Surface loaded fibers must be completely
removed prior to using low velocity clean water rinse.
Summary of Contents for AGZ030E
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