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SECTION 6 – OPERATION
OPERATION MODE CHANGEOVER
Changeover to Cooling Mode
1. Press and hold the Operation Mode Cooling but-
ton on the Setting screen for 15 seconds. See Fig-
ure 42 on page 114.
2. Press the Cool or Heat Simultaneous OFF button
on the Setting screen See Figure 42 on page 114.
3. Press the RHW only operation OFF button (if ap-
plicable) on the Setting screen.
4. Set each cooling or heating changeover valve to
cooling mode. See Table 25 on page 112 for in-
formation.
5. Verify the cooling water piping system is filled
with water.
6. Verify that the tapped air is vented.
7. Open (or close) each valve in the cooling water
piping system to ensure the cooling water circula-
tion in the system.
8. Manually operate the cooling water pump and
cooling tower fan.
9. Verify these can be operated and the cooling water
is circulated.
Do NOT operate the cooling water pump
without operating the chilled/hot water
pump to prevent the freezing of chilled/
hot water.
10. While the chiller-heater is stopping, purge the
purging tank, See Manual Method to Purge Non-
Condensable Gas from the Purge Tank on page
134 .
11. While the chiller-heater is stopping, purge the
absorber, See Manual Method to Purge Non-
Condensable Gas Directly from Absorber on page
134
12. Operate the chiller-heater.
13. Purge the absorber again. See Manual Method to
Purge Non-Condensable Gas Directly from Ab-
sorber on page 134.
14. Press the Purge Mode Auto button on the Setting
screen. See Automatic Method to Purge Non-con-
densable Gas from the Purge Tank on page 135.
124
Changeover to Heating Mode
1. Select the appropriate method to treat the cooling
water in the absorber and condenser tubes during
the heating operation period. See Storage Method
of the Cooling Water During Heating Operation
Period on page 157.
If the operation mode (Cooling or Heat-
ing) is changed periodically, clean each
heat transfer tube with a nylon brush
during this step.
2. Press and hold the Operation Mode Heating but-
ton on the Setting screen for 15 seconds. See Fig-
ure 42 on page 114.
3. Press the Cool or Heat Simultaneous OFF but-
ton on the Setting screen. See Figure 42 on page
114.
4. Press the RHW only operation OFF button (if ap-
plicable) on the Setting screen.
5. Set each cooling or heating changeover valve to
Heating mode. See Table 25 on page 112.
6. While the chiller-heater is stopping, purge the
purge tank. Use the procedure shown in Manual
Method to Purge Non-Condensable Gas from the
Purge Tank on page 134 .
7. Close all of the manual valves in the purge line
(V10, V11, V12, V13, V14, V15, and V16).
8. Press the Purge Mode Auto button on the Setting
screen.
Use Simultaneous Residential Hot Water
Supply Mode (Option)
In this mode, residential hot water is supplied through
the auxiliary heat exchanger (option) while chilled wa-
ter or hot water is supplied through the evaporator.
1. Check that the correct Operation Mode button
(Cooling or Heating) is pressed on the Setting
screen. See Figure 42 on page 114.
If you need to change the operation mode,
remember to press and hold the button for
15 seconds.
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
JOHNSON CONTROLS
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