JOHNSON CONTROLS
61
SECTION 5 - COMMISSIONING
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
5
Chiller-Heater
Chilled / Hot Water
Pump
Sequential
Operation
AND
Cooling Water
Pump
Sequential Operation
AND
Interlock
(2)
Sequential
Operation
Interlock
Other interlock device and equipment (Earthquake sensor, gas leak detector, ventilation fan, and other relevant interlock equipment.
NOTES:
1. Create the sequential operation system as shown so that the chilled / hot water pump, cooling water pump, and cooling tower can be started
or stopped automatically with an operation command signal from the chiller-heater control panel.
2. If only one air conditioner is used for this system, connect the operation interlock (answerback) signal from the air conditioner to the chiller-
heater control panel to prevent the chiller-heater from operating without the air conditioner (indicated by broken lines).
3. Create the sequential operation system so that the cooling water pump is automatically stopped when the chilled / hot water pump is
stopped.
4. During heating operation, these devices and equipment do not need to be used.
5. If the chilled / hot water and cooling water system is the common system, it is required to install the isolation valve
on the chilled/hot water and cooling water inlet pipe before the chiller, and interlock these isolation valves with the
chiller control panel. This is mandatory for safe and reliable operation of the chiller and to prevent potential crystallization
of lithium bromide solution and freezing of the evaporator tubes.
FIGURE 24 -
SEQUENTIAL OPERATION FLOWCHART
Air Conditioner
(4)
Sequential Operation
Cooling Tower
(4)
Gas Engine
Interlock (Answerback)
Other Sequential Operation device and equipment (example: ventilation fan)
FIGURE 25 -
SHUTDOWN EXHAUST GAS CHILLER-HEATER FLOWCHART
Stop chiller - heater
AND
Dilution
Stop air conditioning
system
Completed
Chilled / hot water pump
stop
Not completed
Air conditioner stops
NOTE:
Create sequential operation system as shown above to allow the air conditioner to keep operating during the dilution cycle,
so that it can be stopped automatically after the completion of the dilution cycle. Otherwise, the chiller-heater could be
damaged due to freezing of the chilled water or crystallization of the LiBr solution.