Figure 29 - Direct Fire Sequential Operation Flowchart; Figure 30 - Stopping Absorption Chiller-Heater Direct Fire Flowchart - York EX Series Installation, Operation & Maintenance Instructions Manual

FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
Sequential
Operation
Chilled/Hot Water
Interlock
AND
Sequential
Operation
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
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

Stop
air conditioning
system
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

JOHNSON CONTROLS
Sequential
Operation
Pump
(2)
(3)
AND
Interlock
Other interlocks, including earthquake sensor, abnormal room temperature sensor, etc
common system,
Stop chiller-heater
Air Conditioner
Sequential
Operation
Cooling Water Pump
it is necessary to install the isolation valve on the
Chiller-Heater
dilution operation
begins
Not completed
Chilled/hot water pump
and air conditioner stop
SECTION 5 - COMMISSIONING
Cooling Tower
Completed
Chiller-heater dilution
operation completed
AND
5
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