JOHNSON CONTROLS
25
SECTION 2 - PRE-STARTUP AND SYSTEM OPERATING PROCEDURES
FORM 160.67-O2
ISSUE DATE: 10/9/2020
2
is achieved, the sealing water flow may be further re-
duced. Gradually close the throttling valve until either
a loss of vacuum (at the gauge on the pump inlet pip-
ing below the check valve) is experienced or the pump
trips on low sealing water flow. This is the minimum
setting and the valve should be opened slightly from
this position to obtain the best vacuum. Failure to ob-
tain the design vacuum may be due to excessive air
infiltration. Check flanged connections for leaks. After
testing, return the pump to the AUTOMATIC mode.
Test the operation of the Standby Pump
the same previously described. If the
chiller is equipped with an optional
standby pump, in the automatic mode, the
vacuum pumps will be switched-over (at
each Chiller start) to share operational
time. If the lead pump fails to start or fails
while the chiller is operating, toggle to
standby pump will be done automatically.
If both pumps fail, the chiller will be not
be allowed to start and will shutdown if
operating.
The lead vacuum pump will be started
automatically after the fty second pre-
lube. The vacuum pump will be stopped
automatically at shutdown when the
vacuum breaker solenoid is de-energized.
PREPARE THE STEAM CONDENSER
ATMOSPHERIC RELIEF VALVE
Check the steam condenser atmospheric relief valve to
ensure that the manual opening device is disabled. The
discharge of this valve must be piped to a safe location,
outdoors.
The relief valve hand wheel must be ro-
tated fully counter-clockwise to prevent
the valve from being manually lifted o
its seat.
Open the valve supplying sealing water to the atmo-
spheric relief valve enough to obtain a trickle flow out
the overflow line. This will ensure that atmospheric re-
lief valve sealing water is present to the proper level in
the valve.
PREPARE THE CHILLED AND CONDENSER
WATER PIPING AND PUMPS
Ensure that the pump motor starters and any automatic
isolation valves located in the inlet/outlet piping are
operable.
Before the initial operation of the pumps,
both water circuits should be thoroughly
vented of all air at the high points. Failure
to do so will result in pass bae damage.
PREPARE THE PRESSURE POWERED PUMP
If the chiller is supplied with a Pressure Powered Pump
to remove condensate from the Turbine casing (Ex-
haust end), open the valve in the Motive Pressure Line
to the pump.
VERIFY ALL USER DEFINED SETPOINTS
Using the checklist in the YST Start-up checklist Form
160.67-CL1, ensure that all setpoints are correct for the
equipment supplied on the chiller and expected operat-
ing conditions. Refer to the YST OptiView™ Control
Center Operation Manual Form 160.67-O1 for a de-
tailed explanation of all setpoints.
PRE-STARTUP PROCEDURES – AFTER
SHORT TERM SHUTDOWN
A short term shutdown is defined as overnight or
several days where the turbine has been allowed to
cool down but the system remains in a ‘READY TO
START” condition. During this shutdown period, all
manual valves with the exception of the steam sup-
ply valves, the atmospheric relief valve sealing water
supply, and the turbine steam ring drain valve would
remain in their original operating positions. The oil
heater and motor protector disconnect switches in the
Power Panel would remain in the “ON” position. The
turbine steam ring drain valve (if NOT supplied w/
steam ring drain solenoid) should have been opened
after the previous shutdown to remove any conden-
sate as the turbine cooled down. Prior to starting the
chiller, some routine checks are required to be certain
plant conditions that would affect the chillers operation
have not changed since the last operation. The follow-
ing procedures must be performed prior to starting the
chiller:
1. Check the status and availability of all utilities;
electric, water, instrument air, and steam. Check
that a minimum of 80 PSIG pneumatic control
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