2.7.7.5
Remote Alarm
During the initiation of a safety shutdown, the 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.
2.7.7.6
Energy Management Control System (EMCS) Interface
The control system shall be capable of communicating all data to a remote
integrated DDC processor through a single shielded cable. The data shall
include as a minimum all system operating conditions, capacity controls,
and safety shutdown conditions. The control system shall also be capable
of receiving at a minimum the following operating commands.
a.
Remote Unit Start/Stop
b.
Remote Chilled Water Reset
c.
Remote Condenser Water Reset
2.8
ACCESSORIES
2.8.1
Refrigerant Leak Detector
**************************************************************************
NOTE: Refrigerant leak detectors will be provided
as required by the "System Application
Requirements" in ASHRAE 15.
When a detector is required, the location will be
indicated on the drawings. Detectors are best
located between the refrigeration system and the
room exhaust. Sampling points from a detector will
be located a maximum of 18 inches above the finished
floor since all commonly-used refrigerants are
heavier than air.
As a rule of thumb, the distance between any
refrigeration system and a refrigerant sampling
point shouldn't exceed 50 feet. In order to meet
the recommended 50 foot distance, a mechanical room
can be provided with either multiple detectors each
with single sampling points or with one detector
that has the capability of monitoring at multiple
sampling points. If multiple sampling points are
required, enter the number in the appropriate blank
below.
Per ASHRAE 15, when a detector senses refrigerant it
must activate an alarm and initiate the room
ventilation system. In regards to alarms, as a
minimum, indicate that the detector will energize a
light on or near the detector as well as a second
light installed on the outside wall next to the
SECTION 15620A
Page 41
Previous Page
