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
mechanical room entrance. The exterior light will
be provided with a sign that warns personnel
entering the mechanical room of a refrigerant
release and that a SCBA is required to enter. If
applicable to the installation, include an audible
alarm on the exterior of the mechanical room.
Include the electrical design for the alarm system
on the drawings.
As an additional item, ASHRAE 15 states that
open-flame devices (i.e., boilers, etc.) cannot be
installed in the same area as a refrigeration
system, unless either combustion air for the
open-flame device is ducted straight from outside to
the device; or the alarm relay from the detector is
used to automatically shutdown the combustion
process in the event of refrigerant leakage.
Indicate all applicable alarm controls on the
drawings.
Delete the information in the last bracketed
sentences if an EMCS is not applicable to the design.
**************************************************************************
Detector shall be the continuously-operating, halogen-specific type.
Detector shall be appropriate for the refrigerant in use. Detector shall
be specifically designed for area monitoring and shall include [a single
sampling point] [[_____] sampling points] installed where indicated.
Detector design and construction shall be compatible with the temperature,
humidity, barometric pressure and voltage fluctuations of the operating
area. Detector shall have an adjustable sensitivity such that it can
detect refrigerant at or above 3 parts per million (ppm). Detector shall
be supplied factory-calibrated for the appropriate refrigerant(s).
Detector shall be provided with an alarm relay output which energizes when
the detector detects a refrigerant level at or above the TLV-TWA (or
toxicity measurement consistent therewith) for the refrigerant in use. The
detector's relay shall be capable of initiating corresponding alarms and
ventilation system as indicated on the drawings. Detector shall be
provided with a failure relay output that energizes when the monitor
detects a fault in its operation. [Detector shall be compatible with the
facility's energy management and control system (EMCS). The EMCS shall be
capable of generating an electronic log of the refrigerant level in the
operating area, monitoring for detector malfunctions, and monitoring for
any refrigerant alarm conditions.]
SECTION 15700A
Page 45
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