JOHNSON CONTROLS
22
FORM 160.67-O2
ISSUE DATE: 10/9/2020
SECTION 2 - PRE-STARTUP AND SYSTEM OPERATING PROCEDURES
ture falls to 4°F (2.2°C) or more below the target, the
heater is turned on. It is turned off when the oil temper-
ature increases to 3°F (1.7°C) above the target value.
If the target value is greater than 160°F (71°C), the tar
get de faults to 160°F (71°C). If the target value is less
than 110°F (43.3°C), it defaults to 110°F (43.3°C).
To prevent over heat ing of the oil in the event of a con-
trol center component fail ure, the oil heat er ther mo
stat (1HTR) is set to open at 180°F (82°C).
CHECK THE OIL LEVEL IN THE
COMPRESSOR OIL RESERVOIR
Proper operating oil level – During operation, the oil
level should fall to the “Operating Range” identified on
the vertical oil level indicator label.
VERIFY THE COMPRESSOR OIL PUMP
OPERATION
Before applying power to the chiller, ensure that the
compressor oil heater protector disconnect switch
(OL1) in the Power Panel is in the “OFF” position.
Close the main three-phase disconnect switch and en-
sure that appropriate power is available at the Power
Panel. Check that the compressor oil reservoir has the
proper oil level and switch the oil heater protector dis-
connect switch (OL1) in the Power Panel to the “ON”
position to energize the oil heater.
The oil heater is automatically controlled
by the control panel at all times during
shutdown and operation of the chiller to
maintain the oil temperature in the oil
reservoir at a target value which is 50°F
above the condenser refrigerant satura-
tion temperature. It is turned on at 4°F
below the target value and o at 3°F above
the target value. To prevent overheating
the oil, the heater has an integral thermo-
stat that opens at 180°F.
While viewing the compressor OIL SUMP SCREEN
on the OptiView™ Control Center, verify that the com-
pressor oil temperature is at least 110°F. Open the main
three-phase disconnect switch and replace the fuses
FU10, FU11, and FU12. Close the main three-phase
disconnect switch and use the MANUAL key to verify
that the oil pump operates properly.
VERIFY THE TURBINE GOVERNOR VALVE
OPERATION
Ensure that the main steam inlet block valve, steam inlet
slow roll bypass valve bypass valve, turbine pneumatic
trip valve, and turbine governor valve are fully closed.
While viewing the ANALOG I/O EXPANSION TEST
SCREEN on the OptiView™ Control Center, manually
adjust the output signal to the governor valve and veri-
fy that the valve strokes fully between 4 and 20 maDC
output signals. The governor valve positioner is fac-
tory calibrated to provide the correct pressure output to
the valve diaphragm with a 4-20 mA DC control signal
from the OptiView™ Control Center. See Section 24 of
Form 160.67-M3 for more information.
Chillers manufactured after December
2006 are NOT designed with separate
steam inlet and slow roll bypass valves.
LD08647
• If the oil level during operation is in the
“Over Full” region of the oil level indi-
cator, oil should be removed from the
oil reservoir, until the oil level is to the
“Operating Range”.
• If the oil level during operation is in
the “Low Oil” region of the oil level
indicator, oil should be added to the
oil reservoir. (See SECTION 4 - OP-
ERATIONAL MAINTENANCE in this
manual.)
A complete oil change may
be required if the oil is dark
or cloudy or an oil analysis
indicates contaminated oil.
Comply with EPA and Local
regulations when removing
or disposing of Refrigeration
System oil!
CHECK THE STATUS OF ALL UTILITIES
Ensure that the correct three-phase power supply is
available at the main disconnect switch in the Power
Panel and that it is properly phased: Phase A-L1, Phase
B-L2, Phase C-L3.
Check that a minimum of 80 PSIG pneumatic control
air supply is available at the filter regulators on the
turbine governor valve and steam condenser. Check
the gauges to ensure that 25 PSIG is available to the
steam condenser level control valve current to pneu-
matic (I/P) transducer. The governor valve positioner
supply air gauge should read 5 PSIG above the actuator
requirement.
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