User's Manual

Installation
P/N 81-CO2MAN-001 4-35 September 2013
4-4.9 Pneumatic Heat Actuated Detection (HAD) System Components
4-4.9.1 HAD
HADs (Figure 4-28) are to be installed in an anticipated path of convective heat flow from the
fire and spaced at a maximum on-center distance of 20 feet (15 feet-10 inches for FM
applications) for ceiling heights up to 12 feet. Consult NFPA 72 for reduction in spacing for
ceiling heights greater than 12 feet, and for spacing guidelines when different ceiling
configurations are encountered. Ensure that no HAD is mounted at a location where normal
process conditions can cause temperature increases to occur at rates faster than 20
o
F per
minute.
The pneumatic heat actuated detector (HAD) is attached to a mounting bracket for ease of
installation in industrial applications. Depending upon the size of the area being protected, the
number of HADs used can range from a minimum of 1 to a maximum of 15. When up to 5 HADs
are required, they are parallel branched by means of tee connections from a common tubing
line, and the tubing is connected directly to the control head. When more than 5 HADs are
required, they are evenly distributed on separate tubing lines and the individual tubing lines
are connected directly to the control heads. Therefore, for 15 HADs, three (3) control heads
should be installed.
CAUTION
Pneumatic detectors shall be installed on the ceiling and not on the underside
of beams. Refer to the approved installation drawings for quantity and location
of detectors.