Table 27: Maintenance and inspection
Task Contents Frequency Scope
Repair of paint (epoxy paint) of
inside wall of chilled water and
cooling water chamber cases
Repair the paint of the inside wall periodically.
Chilled water: 2 years
Cooling water: 1 year
S
Analysis of solution and
addition of inhibitor
The concentration of the inhibitor must be kept
proper to prevent corrosion of inside parts. Analyze
the solution to detect leakage in the early period.
Every 6 months S
Filtration and refining of
solution
As the inside of the chiller is corroded, corrosion
particles are increased. Particles accumulated
on the heat exchange tube surfaces lower the
heat exchange rate, that is, the performance.
Accordingly, filter the solution periodically.
5-6 years S
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)
Yearly S
Cleaning of tubes with brush
or water jet (Evaporator)
Every 2 years S
Cleaning of tubes with brush
or water jet (Generator)
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 periodically.
Every 4 years S
Chemical cleaning of tubes
(Absorber, condenser)
Every 2 years* S
Chemical cleaning of tubes
(Evaporator)
Every 4 years* S
Chemical cleaning of tubes
(Generator)
Since hard scales sticking to the tubes cannot be
removed with a brush or water jet, remove them
chemically, depending on the condition.
Every 8 years* S
Check for slight leakage
Vacuum and airtightness must be maintained
to ensure the reliability and performance of the
absorption chiller. 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)
Every 4 years S
Eddy current test on tubes
(Evaporator)
Every 6 years S
Eddy current test on tubes
(Generator)
Check the inside of the tubes for corrosion caused
by bad quality chilled water, cooling water, and
steam periodically.
Every 4 years or
10,000 hours
S
Check steam condensate
control valve seat
Check the steam condensate control valve seat for
leaks while the chiller is stopping
Yearly S
Note:
1. C = Customer and S = Johnson Controls Service
2. Note: *If water quality analysis indicates necessity.
Refrigerant pump manual stop
The refrigerant pump can be stopped manually for maintenance purposes. It can be stopped even
while the chiller operates.
1. Navigate to the Control Panel Setting screen.
2. Press the Refrigerant Pump Stop button.
YHAU-C Single Effect Steam-Fired Absorption Chiller154
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