JOHNSON CONTROLS
147
SECTION 7 – MAINTENANCE
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
7
TASK CONTENTS FREQUENCY SCOPE
Check of operation of
various safety relays
Check the operation of the safety relays periodically.
yearly
S
Cleaning of tubes
with brush or water jet
(Absorber, condenser)
If foreign matter sticks to the inside of the tubes of the chiller-
heater, refrigerating performance is lowered and the tubes
become corroded. Accordingly, remove slime, soft scales, and
other foreign matter from the inside of the tubes periodically.
S
Cleaning of tubes
with brush or water jet
(Evaporator)
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.
S
Chemical cleaning of
tubes (Evaporator)
every 4 years* S
Check for slight leakage
Vacuum and airtightness must be maintained to ensure the
reliability and performance of the absorption chiller-heater.
Accordingly, recommend that the machine should be checked
for slight leakage with a special vacuum and airtightness
diagnostic device periodically.
every 2 years S
Eddy current test
on tubes (Absorber,
condenser)
Check the inside of the tubes for corrosion caused by bad
quality chilled/hot water, and cooling water periodically.
every 4 years or
10,000 hours
S
Eddy current test on
tubes (Evaporator)
every 6 years S
Check for leakage of pilot
solenoid valves and gas
shut-off valves.
Check for leakage to outside and passing through the valve
sheets periodically.
every 6 months
S
Check operation of
combustion system
Check the operation of the ignition system, air damper, fuel gas
damper, capacity control motors, burner fan, and protect relay
(burner controller) periodically.
S
Check and adjust
combustion
• Measure the concentration of O
2
and CO. Adjust it if necessary
to ensure suitable and efcient combustion.
• Collect the combustion data. Check the data collected during
the commissioning.
S
C = Customer, S = Johnson Controls Service
NOTE: *If water quality analysis indicates necessity.
TABLE 26 - MAINTENANCE AND INSPECTION (CONT'D)
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