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JOHNSON CONTROLS
140
FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
SECTION 7 – MAINTENANCE
TASK CONTENTS FREQUENCY SCOPE
Measurement of
insulation resistance of
electric devices
Measure the insulation resistance of the main circuit and motors
(solution pump, refrigerant pump) mainly to check for lowering
of insulation. When measuring the insulation resistance, be sure
to disconnect the wires of the temperature controller, and other
related controls.
Yearly
S
Check of terminals for
looseness
Check each terminal in the control panel for looseness.
S
Check of operation of
control panel
Check the operation of the control panel to prevent troubles
caused by malfunction of the control panel.
S
Check capacity of purge
unit
See Purge Procedure on page 132 . Check the capacity of the
purge unit.
Monthly S
Check of leakage through
purge solenoid valves
By measuring vacuum down speed, check for leakage through
purge solenoid valves.
Yearly
S
Overhaul check of purge
solenoid valves
Perform overhaul of purge solenoid valves. S
Check of airtightness
Measure the quantity of non-condensable gas discharged from
the vacuum pump.
Every 2-3 months S
Check continuity of
protective bonding circuit
Check continuity of protective bonding circuit. Yearly S
Analysis of quality of
chilled water, cooling
water, and steam drain
Reliable water treatment companies are available in most
larger cities to supply a water treating process which will greatly
reduce the corrosive and scale forming properties of almost any
type of water. Be sure to request the first analysis within one
month after the test operation is started.
Every 2-3 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
Sleeve 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.
2-3 years or
10,000 hrs
S
Disassembly inspection
and cleaning of vacuum
pump
Disassemble, inspect, and clean the vacuum pump to maintain
its 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.
4 years S
Inspection of chilled
water box and
replacement of packing Open the waterbox cover, 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
Every 1 year S
Inspection of the steam
box and replacement of
gasket
• Open the steam box.
• Check the tube plate and the expanded sections of the tubes
for abnormal thinning.
Every 3 years S
C = Customer, S = Johnson Controls Service
TABLE 28 - MAINTENANCE AND INSPECTION (CONT'D)