2.6.4.3
Programmable Setpoints
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NOTE: Small sized chillers may not have security
setting capabilities.
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The control system shall be capable of being reprogrammed directly at the
unit. [No parameters shall be capable of being changed without first
entering a security access code.] The programmable setpoints shall include
the following as a minimum.
a.
Leaving Chilled Water Temperature
b.
c.
[Time Clock/Calender Date]
2.6.4.4
Safety Controls with Manual Reset
Chiller shall be provided with the following safety controls which
automatically shutdown the chiller and which require manual reset.
a.
Low chilled water temperature protection
b.
High condenser refrigerant discharge pressure protection
c.
d.
Chilled water flow detection
e.
High motor winding temperature protection
f.
g.
[Motor current overload and phase loss protection]
2.6.4.5
Safety Controls with Automatic Reset
Chiller shall be provided with the following safety controls which
automatically shutdown the chiller and which provide automatic reset.
a.
Over/under voltage protection
b.
Chilled water flow interlock
c.
[Phase reversal protection]
2.6.4.6
Remote Alarm
During the initiation of a safety shutdown, a chiller's control system
shall be capable of activating a remote alarm bell. In coordination with
the chiller, the contractor shall provide an alarm circuit (including
transformer if applicable) and a minimum 100 mm 4 inch diameter alarm bell.
Alarm circuit shall activate bell in the event of machine shutdown due to
the chiller's monitoring of safety controls. The alarm bell shall not
sound for a chiller that uses low-pressure cutout as an operating control.
SECTION 15620A
Page 26