York EX Series Installation, Operation & Maintenance Instructions Manual page 146

SECTION 7 – MAINTENANCE
TABLE 26 - MAINTENANCE AND INSPECTION (CONT'D)
TASK
Check of quantity of
solution and refrigerant
Disassembly inspection
and cleaning of solution
pump and refrigerant
pump
Disassembly inspection
and cleaning of vacuum
pump
Replacement of gaskets
of airtight parts
Inspection of chilled /
hot water box and
replacement of packing
Inspection of cooling
waterbox and
replacement of gasket
Repair of paint (or epoxy
paint) of inside wall of
chilled/hot water and
cooling waterboxes
Analysis of solution and
addition of inhibitor
Addition of surface active
agent
Filtration and refining of
solution
C = Customer, S = Johnson Controls Service
146
CONTENTS
The solution is not consumed, but the refrigerant is discharged
little by little each time purging is performed. If the quantity
of the refrigerant becomes insufficient, the condensation
preventive function does not work normally. Accordingly, check
the quantity of the refrigerant periodically.
Sleeve bearings are used for the solution pump and refrigerant
pump, and they are normally lubricated with water solution
of lithium bromide and refrigerant. They are worn gradually,
however. Since excessive wear can cause a pump problem,
disassemble and inspect them periodically. The internal strainer
must be cleaned periodically, too.
Disassemble, inspect, and clean the vacuum pump to maintain
its capacity.
Replace the gaskets of the airtight parts to maintain the
airtightness of the absorption chiller-heater.
Open the waterbox cover periodically, check the inside paint for
damage, and check the inside of the tubes for scales.
Repair the paint of the inside wall periodically.
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.
Since surface active agent is discharged out of the machine
little by little each time purging is performed, new agent must be
added periodically. If too much surface active agent is added,
however, it will have the opposite effect. Add usually 700 cc per
year.
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 periodically.
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
FREQUENCY SCOPE
yearly
(during operation S
at 100%)
2-3 years or
S
8,000 hrs
4 years S
4 years S
every 2 years S
every 1 year S
Chilled/hot water: 2
years
S
Cooling water: \1 year
every 6 months S
1 year S
5-6 years S
JOHNSON CONTROLS