York EX Series Installation, Operation & Maintenance Instructions Manual page 147

FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
TABLE 26 - MAINTENANCE AND INSPECTION (CONT'D)
TASK
Check of operation of
Check the operation of the safety relays periodically.
various safety relays
Cleaning of tubes
with brush or water jet
If foreign matter sticks to the inside of the tubes of the chiller-
(Absorber, condenser)
heater, refrigerating performance is lowered and the tubes
become corroded. Accordingly, remove slime, soft scales, and
Cleaning of tubes
other foreign matter from the inside of the tubes periodically.
with brush or water jet
(Evaporator)
Chemical cleaning
of tubes (Absorber,
Since hard scales sticking to the tubes cannot be removed with
condenser)
a brush or water jet, remove them chemically, depending on the
condition.
Chemical cleaning of
tubes (Evaporator)
Vacuum and airtightness must be maintained to ensure the
reliability and performance of the absorption chiller-heater.
Check for slight leakage Accordingly, recommend that the machine should be checked
for slight leakage with a special vacuum and airtightness
diagnostic device periodically.
Eddy current test
on tubes (Absorber,
Check the inside of the tubes for corrosion caused by bad
condenser)
quality chilled/hot water, and cooling water periodically.
Eddy current test on
tubes (Evaporator)
Check for leakage of pilot
Check for leakage to outside and passing through the valve
solenoid valves and gas
sheets periodically.
shut-off valves.
Check the operation of the ignition system, air damper, fuel gas
Check operation of
damper, capacity control motors, burner fan, and protect relay
combustion system
(burner controller) periodically.
• Measure the concentration of O
Check and adjust
combustion • Collect the combustion data. Check the data collected during
C = Customer, S = Johnson Controls Service
NOTE: *If water quality analysis indicates necessity.
JOHNSON CONTROLS
CONTENTS
to ensure suitable and efficient combustion.
the commissioning.
and CO. Adjust it if necessary
2
SECTION 7 – MAINTENANCE
FREQUENCY SCOPE
S
yearly
S
S
every 2 years*
S
every 4 years* S
every 2 years S
every 4 years or
S
10,000 hours
every 6 years S
S
S
every 6 months
S
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