JOHNSON CONTROLS
144
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
SECTION 7 – MAINTENANCE
11. Re-connect the electrical wiring of the solution
pump.
12. Press the Forced Dilution
ON
button. The solu-
tion pump starts.
13. Press the Control Valve Mode
Manual
button.
14. Set the Valve Position Setting to 30 - 40%. For
detailed information on how to change the set-
Change Numeric Values on page 92
.
15. Observe the liquid level in the absorber.
16. When the liquid level in the absorber drops, press
the Forced Dilution
OFF
button.
17. Repeat steps 12 through 16 three - four times. If
the liquid level in the absorber does not go down,
the crystals have melted.
18. Let the solution pump operate independently for
about 30 minutes. Constantly observe the liquid
level in the absorber while the solution pump op-
erates.
19. After about 30 minutes, stop the solution pump.
20. Press the Refrigerant Pump
Auto
button.
21. Return the valve cap. There is an O-ring between
the cap and valve. When fitting the cap, make
sure that the O-ring is set normally.
PRECAUTIONS FOR DECRYSTALLIZATION
•
Cycle the chilled or hot and cooling water pumps
off and on during the melting process.
•
Remove any sensors that are sensitive to heat be-
fore you start the melting operation. The tempera-
ture of the chilled or hot and cooling water that
remains in the absorption chiller-heater may rise
to about 70°C.
•
When you start the chiller-heater after melting the
crystals, discharge the chilled/hot water and cool-
ing water first. If that water is left in the machine,
the paint on the inside walls may be peeled off.
MAINTENANCE ITEMS
Maintenance and inspection items along with standard
inspection periods are shown in the next table. For de-
tails, contact your local Johnson Controls Service Cen-
ter.
Inspection frequency may be adjusted according to the
actual operating conditions.
