SECTION 6 – OPERATION
FORM 155.32-ICOM2.EN.UL
ISSUE DATE:1/10/2018
116
JOHNSON CONTROLS
OPERATION MODE CHANGEOVER
Changeover to Cooling Mode for Chiller with Evaporator Heating
1.
Press and hold the Operation Mode
Cooling
button on the Setting screen for 15 sec-
onds (See
2. Press the Cool or Heat Simultaneous OFF button on the Setting screen. (See
)
3. Press the RHW only operation
OFF
button (if applicable) on the Setting screen.
4. Set each cooling or heating changeover valve to cooling mode. See
for information.
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 circulation 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.
10. While the chiller-heater is stopping, purge the purging tank, see
Purge Non-condensable Gas from the Purge Tank on page 128
11. While the chiller-heater is stopping, purge the absorber, see
12. Operate the chiller-heater.
13. Purge the absorber again.
14. Press the Purge Mode Auto button on the Setting screen. See
Purge Non-condensable Gas from the Purge Tank on page 128
Changeover to Heating Mode for Chillers with Evaporator Heating
1. Select the appropriate method to treat the cooling water in the absorber and Condens-
er tubes during the heating operation period. See
Storage Method of the Cooling Wa-
ter During Heating Operation Period on page 153
2. Press and hold the Operation Mode
Heating
button on the Setting screen for 15 sec-
onds.
3. Press the Cool or Heat Simultaneous
OFF
button (if applicable) on the Setting screen.
4. Press the RHW only operation
OFF
button (if applicable) on the Setting screen.
5. Set each cooling or heating changeover valve to Heating mode. See
.
6. While the chiller-heater is stopping, purge the purge tank. Use the procedure shown
in
Manual Method to Purge Non-CONDensable Gas Directly from Absorber on page
.
7. Close all of the manual valves in the purge line (V10, V11, V12, V13, V14, V15, and
V16).
8. Press the Purge Mode
Manual
button on the Setting screen.
CAUTION: Do NOT operate the cooling water pump without operating the chilled/hot
water pump to prevent the freezing of chilled/hot water.
CAUTION: If the operation mode (Cooling or Heating) is changed periodically, clean
each heat transfer tube with a nylon brush during this step.
