York YD A, Operating & Maintenance, Page: 20 / 52

JOHNSON CONTROLS
20
FORM 160.69-O2
ISSUE DATE: 9/30/2020
SECTION 1 – DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION
FIGURE 2 – CHILLER OPERATION FLOW CHART - (CONT'D)
LD10492
2 Compressors Running
(from Page 3)
Electro-Mechanical Starter
Chiller Fault Stop
(manual or auto restart)
Stop both compressors
simultaneously
Chiller Fault
Condition
Post Lube Run time
both compr oil pumps
Energize Oil Heater
1 Compressor Running
(from Page 1 or 4)
Chiller Fault
Condition
Post Lube Run time
lead compr oil pump
Energize Oil Heater
System Standby
Close compressor vanes
and close discharge
valves
Stop Lead (both)
compressor
Close compressor vanes
and close discharge
valves
YD Dual Compressor Chiller