JOHNSON CONTROLS
139
SECTION 7 – MAINTENANCE
FORM 155.30-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
7
TASK
CONTENTS
FREQUENCY
SCOPE
Check continuity of
protective bonding circuit
Check continuity of protective bonding circuit.
Yearly
S
Analysis of quality of
chilled water, cooling
water, and hot water
drain
See
Water Quality Control on page 143
. Control
the quality of chilled water, cooling water, and hot
water within the standard range. Be sure to perform
the first analysis within one month after the test
operation is started.
Every 6 months
C
Check of quantity of
solution and refrigerant
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.
Yearly
(during operation
at 100%)
S
Disassembly inspection
and cleaning of solution
pump and refrigerant
pump
Sliding bearings are used for the solution pump
and refrigerant pump, and they are normally
lubricated with water solution of lithium bromide
and refrigerant. Since excessive wear can cause
a pump problem, disassemble and inspect the
bearings. The internal strainer must also be
cleaned.
20,000 hrs
S
Disassembly inspection
and cleaning of vacuum
pump
Disassemble, inspect, and clean the vacuum pump
to maintain its capacity.
20,000 hrs
S
Replacement of gaskets
of airtight parts
Replace the gaskets of the airtight parts to maintain
the airtightness of the absorption chiller.
Every 24,000 hrs
S
Inspection of chilled
water chamber case and
replacement of packing
Open the water chamber case cover. Check the
inside paint for damage. Check the inside of the
tubes for scales.
Every 2 years
S
Inspection of cooling
water chamber case and
replacement of packing
Yearly
S
Inspection of hot water
chamber case and
replacement of packing
Every 2 years
S
Repair of paint (tar
epoxy paint) of inside
wall of chilled water and
cooling water chamber
cases
Repair the paint of the inside wall.
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 stage of
operation.
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.
5-6 years
S
Check of operation of
various safety relays
Check the operation of the safety relays.
Yearly
S
C = Customer and S = Johnson Controls Service
TABLE 29 -
MAINTENANCE AND INSPECTION (CONT'D)
