FORM 155.32-ICOM2.EN.UL
SECTION 7 – MAINTENANCE
ISSUE DATE:1/10/2018
JOHNSON CONTROLS
140
Table 38 -
Maintenance and Inspection
TASK
CONTENTS
FREQUENCY
SCOPE
C = Customer, S = Johnson Controls Service
Recording of operation
data
Collect the operation data (Refer to
Start-up and Pre-Startup
Checklist 155.31-CL1
) and check the data with the data
collected during the factory test.
Weekly
C
Check of liquid level
Abnormal Solution and Refrigerant Levels on page 166
.
Check the liquid level at each part.
Daily
C
Refining of refrigerant
. Refine the refrigerant.
every 2-3 weeks
S
Manual purging from
purging tank
. Manually purge non-
condensable gas from the purging tank.
Since, the machine has an
automatic purge system, perform a
purge once at the beginning of
each season every year OR once
every 2-3 months.
S
Manual purging from
absorber
See
. Manually purge non-
condensable gas from the absorber.
every 2-3 months
S
Replacement of oil in
vacuum pump
Replace the oil in the vacuum pump.
monthly
C
Check of Vacuum Pump
After the replacement of the lubricant oil for the vacuum pump, be
sure to pull the pulley belt and check the smooth motion of the
pulley.
C
Appearance check
Check the outside of the unit for damage (example, leakage for
chilled/hot water and cooling water, rusting, or other noted
damage). Check the solution pump and refrigerant pump for
abnormal sounds and vibration.
C
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 wires
that could interfere with this testing.
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 of capacity of
purge unit
. 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/hot water, and
cooling water
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 minimally
discharged 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 LiBr
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
8,000 hrs
S
