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4.
Check each refrigerant sight glass for air bubbles
or moisture indication. Bubbles in the refrigerant
indicate either low refrigerant charge or
excessive pressure drop in the liquid line. If the
sight glass indicates that there is a refrigeration
problem, have the unit serviced as soon as
possible.
Once a Month
Repeat items 1 through 4 listed above and continue
with the following.
5.
With the main disconnect shut off and locked
out, check the condition of electrical connections
at all contactors, starters and controls. Check for
loose or frayed wires.
6.
Check the incoming voltage to make sure it is
within 10% of the design voltage for the chiller.
7.
Check the amp draws to each leg of the
compressor(s) to confirm that it is drawing the
proper current.
8.
Check the system superheat and sub-cooling.
Normal superheat is approximately 10°F;
however, it may be high but not more than 15°F.
Normal sub-cooling ranges from 10°F to 20°F.
Once Every Three Months
Repeat items 1 through 8 listed above and continue
with the following.
9.
Check the evaporator Y-strainer and clean if
necessary. The Y-strainer is located between the
return connection and the evaporator. This may
require more frequent cleaning if contaminants
can easily get into the system.
Once a Year
Repeat items 1 through 9 listed above and continue
with the following.
10.
(Water-Cooled Condenser Chillers Only) Check
the condition of the condenser water for algae,
scale, or other contamination. If needed, rod out
the tubes and back flush condensers before
reconnecting pipes.
11.
(Remote Air-Cooled Condenser Chillers Only)
Check the condition of the air coils of the
remote condensers for dirt and debris. If the
coils are dirty or clogged, use a compressed air
source to blow the contaminants out of the air
coil. To clean, rinse thoroughly with water. Mild
detergent can be used to remove smoke and or
grease stains.
12.
Have a qualified refrigeration technician inspect
the operation of the entire unit to ensure
everything is operating properly.