FORM 155.32-ICOM2.EN.UL
SECTION 7 – MAINTENANCE
ISSUE DATE:1/10/2018
JOHNSON CONTROLS
141
Table 38 -
Maintenance and Inspection
NOTE:
*If water quality analysis indicates necessity.
TASK
CONTENTS
FREQUENCY
SCOPE
Disassembly inspection
and cleaning of vacuum
pump
Disassemble, inspect, and clean the vacuum pump to maintain
optimal capacity.
4 years
S
Replacement of gaskets
of airtight parts
Replace the gaskets of the airtight parts to maintain the
airtightness of the absorption chiller-heater.
4 years
S
Inspection of chilled /hot
water box and
replacement of packing
Open the waterbox cover and check the inside paint for damage,
and check the inside of the tubes for scales.
every 2 years
S
Inspection of cooling
waterbox and
replacement of gasket
yearly
S
Repair of paint (or epoxy
paint) of inside wall of
chilled/hot water and
cooling waterboxes
Repaint the inside wall of the waterboxes.
Chilled/hot 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
Addition of surface active
agent
Since surface active agent is minimally discharged out of the
machine each time purging is performed, a new agent must be
added. If too much surface active agent is added, however, it will
have the opposite effect. Add approximately 700 cc per year.
yearly
S
Filtration and refining of
solution
As the inside of the chiller-heater 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.
5-6 years
S
Check of operation of
various safety relays
Check the operation of the safety relays.
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.
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.
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.
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 the valves and passing through the
valve sheets.
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).
S
Check and adjust
combustion
Measure the concentration of O2 and CO. Adjust it if necessary to
ensure suitable and efficient combustion.Collect the combustion
data. Check the data collected during the commissioning.
S
