which the equipment will be subjected. Coordinate
this temperature with manufacturers to assure
available equipment.
A cooling tower bypass line and modulating control
valve should be evaluated and incorporated into a
design which requires chiller operation in ambient
temperatures less than 13 degrees C (55 degree F).
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Chiller shall be provided with the following adjustable operating controls
as a minimum.
a.
Leaving chilled water temperature control
b.
Adjustable timer or automated controls to prevent a compressor
from short cycling
c.
Automatic lead/lag controls (adjustable) for multi-compressor units
d.
Load limiting
e.
System capacity control to adjust the unit capacity in accordance
with the system load and the programmable setpoints. Controls
shall automatically re-cycle the chiller on power interruption.
f.
Startup and head pressure controls to allow system operation at
all ambient temperatures down to [_____] degrees C F
g.
[Fan sequencing for air-cooled condenser]
2.6.4.2
Monitoring Capabilities
During normal operations, the control system shall be capable of monitoring
and displaying the following operating parameters. Access and operation of
display shall not require opening or removing any panels or doors.
a.
Entering and leaving chilled water temperatures
b.
Self diagnostic
c.
Operation status
d.
Operating hours
e.
Number of starts
f.
Compressor status (on or off)
g.
Refrigerant discharge and suction pressures
h.
Oil pressure
i.
[Condenser water entering and leaving temperatures]
j.
[Number of purge cycles over the last 7 days]
SECTION 15620A
Page 25
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