JOHNSON CONTROLS
140
FORM 155.30-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
SECTION 7 – MAINTENANCE
TASK CONTENTS FREQUENCY SCOPE
Cleaning of tubes
with brush or water jet
(Absorber, condenser)
If foreign matter sticks to the inside of the tubes of
the chiller, refrigerating performance is lowered and
the tubes become corroded. Accordingly, remove
slime, soft scales, and other foreign matter from the
inside of the tubes.
Yearly S
Cleaning of tubes
with brush or water jet
(Evaporator)
Every 2 years S
Cleaning of tubes
with brush or water jet
(Generator)
Every 2 years S
Chemical cleaning
of tubes (Absorber,
condenser)
Since hard scales sticking to the tubes cannot be
removed with a brush or water jet, remove them
chemically, depending on the condition.
Every 2 years* S
Chemical cleaning of
tubes (Evaporator)
Every 4 years* S
Chemical cleaning of
tubes (Generator)
Every 4 years* S
Check for slight leakage
Vacuum and airtightness must be maintained
to ensure the reliability and performance of the
absorption chiller. Accordingly, the machine should
be checked for slight leakage with a special
vacuum and airtightness diagnostic device.
Every 2 years S
Eddy current test
on tubes (Absorber,
condenser)
Check the inside of the tubes for corrosion caused
by bad quality chilled water, cooling water, and hot
water.
Every 4 years S
Eddy current test on
tubes (Evaporator)
Every 8 years S
Eddy current test on
tubes (Generator)
Every 8 years S
C = Customer and S = Johnson Controls Service
NOTE: *If water quality analysis indicates necessity.
TABLE 29 - MAINTENANCE AND INSPECTION (CONT'D)
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