JOHNSON CONTROLS
81
SECTION 5 - COMMISSIONING
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
5
Chiller-Heater
Chilled/Hot Water
Pump
Sequential
Operation
AND
Air Conditioner
Cooling Water Pump
Cooling Tower
Sequential
Operation
AND
Interlock
Sequential
Operation
(2)
(3)
Sequential
Operation
Interlock
Other interlocks, including earthquake sensor, abnormal room temperature sensor, etc
NOTES:
1. Implement sequential operation of the chilled/hot water pump and the cooling water pump from the chiller-heater.
2. If there is only one air conditioner, secure interlock for the air conditioner operation (the part indicated by broken lines).
3. Implement sequential operation in such a way that when the chilled/hot water pump stops, the cooling water stops too.
4. If the chilled/hot and cooling water system is on a
common system,
it is necessary to install the isolation valve on the
chilled/hot water and cooling water inlet pipe entering the chiller, and interlock these isolation valves with the chiller control
panel. It is mandatory for safe and reliable operation of the chiller, and prevents potential crystallization of lithium bromide
solution and freezing of the evaporator tubes.
FIGURE 29 -
DIRECT FIRE SEQUENTIAL OPERATION FLOWCHART
NOTE:
Verify that the air conditioner has stopped after the chiller-heater dilution operation is com-
pleted. Otherwise, the chiller-heater may become damaged due to freezing of the chilled
water and/or crystallization of the solution.
FIGURE 30 -
STOPPING ABSORPTION CHILLER-HEATER DIRECT FIRE FLOWCHART
Stop chiller-heater
AND
Chiller-Heater
dilution operation
begins
Chiller-heater dilution
operation completed
Stop
air conditioning
system
Completed
Chilled/hot water pump
and air conditioner stop
Not completed
