Figure 38 - Steam Sequential Operation Flowchart; Figure 39 - Stopping Absorption Chiller Steam Flowchart - York YHAU-CW Manual

FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
Sequential
Operation
Chilled water pump
Interlock
AND
Sequential
operation
Other interlocks, including earthquake sensor, abnormal room temperature sensor or other relevant sensors.
NOTES:
1. Be sure to implement sequential operation of the chilled water pump and the cooling water pump from the chiller.
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 water pump stops, the cooling water also stops.
4. If the chilled and cooling water system is the common system, you must install the isolation valve on the chilled water and cooling water
inlet pipe entering the chiller, and interlock these isolation valves with the chiller control panel. This is imperative for safe and reliable opera-
tion of the chiller as well as to prevent potential crystallization of lithium bromide solution and freezing of the evaporator tubes.

FIGURE 38 - STEAM SEQUENTIAL OPERATION FLOWCHART

Stop the air
conditioning system
NOTE: Verify that the air conditioner has stopped after the chiller
dilution operation is complete. Otherwise, the chiller may
become damaged due to freezing of the chilled water and/
or crystallization of the solution.
Close the steam supply main valve and steam drain manual
valve once the unit has stopped.

FIGURE 39 - STOPPING ABSORPTION CHILLER STEAM FLOWCHART

JOHNSON CONTROLS
Sequential
Operation
Air conditioner
(2)
(3)
Cooling water pump
AND
Interlock
Stop the absorption
chiller
SECTION 5 - COMMISSIONING
Sequential
operation
Chiller dilution
Completed
operation begins
Chiller dilution
operation completed
Not completed
AND
Air conditioner and
chilled water pump stop
5
Cooling tower
97