SECTION 4 – SYSTEM DESIGN
UL EX3470 ULC EX3470
PAGE 4-60 REV. 11 2014-SEP-01
R-102 Restaurant Fire Suppression Manual
OVERLAPPING NOZZLE COVERAGE (Continued)
Overlapping Appliance Nozzle and Hazard Zone Locations
– Group Protection (Continued)
2. When obstructions are located adjacent to appliance(s)
protected by overlapping nozzles, the overlapping appliance
nozzle spacing must start with the appliance(s) adjacent to
the obstruction. See Figure 4-118.
FIGURE 4-118
001713
3. When an appliance requires dedicated protection with a
protected area intended for overlapping appliance nozzle
protection, the group protection option will be required for
appliances on either side of the appliances using dedicated
protection. Group protection using overlapping appliance
nozzles must begin with the protected appliance(s) adjacent
to the dedicated appliance protected. An overlapping appli
-
ance nozzle(s) must be positioned within 11.5 in. (292 mm)
of the edge(s) of the appliance hazard surface area(s) adja
-
cent to the dedicated nozzle protection. See Figure 4-119.
FIGURE 4-119
001756
4. On protected appliances, all hazard surfaces located in a
group must be within 40-45 in. (1016-1143 mm) from the
nozzle(s). Once that dimension is exceeded, a new group
must be started. See Figure 4-120.
Note:
The supply pipe feeding nozzle groups is to be at the
same elevation. Adjust height for each group only by varying
lengths of nozzle drops.
FIGURE 4-120
007539
Detection Requirements For Overlapping Appliance
Protection
When utilizing overlapping appliance protection, fusible link
detectors must be installed on a maximum of 2 ft (0.6 m) centers,
starting with detectors located in (under) the duct opening(s).
Starting from the detector under the duct opening, add detectors
on 2 ft (0.6 m) maximum spacing until the complete length of the
plenum area is covered, from one end to the other. The location
of the last detector on each end of the plenum must not exceed
2 ft (0.6 m) from end of plenum.
Note:
Standard detector placement can also be utilized when
using overlapping protection. However, the overlapping detector
option cannot be used when utilizing standard R-102 protection.
Refer to Pages 4-71 – 4-73 for detector placement.
11.5 IN.
(292 mm)
MAX.
OUTSIDE
EDGE OF
COOKING
HAZARD
11.5 IN.
(292 mm)
MAX.
OBSTRUCTION
25.5 IN.
(647 mm)
MAX.
25.5 IN.
(647 mm)
MAX.
25.5 IN.
(647 mm)
MAX.
25.5 IN.
(647 mm)
MAX.
HAZARD AREA
245
260
260
260
245
Note:
On continuous appliance protection, start and end with 245
nozzles and 260 nozzle(s) in the middle.
11.5 IN.
(292 mm)
MAX.
EDGE
OF
COOKING
HAZARD
EDGE OF COOKING
HAZARD
EDGE
OF
COOKING
HAZARD
11.5 IN.
(292 mm)
MAX.
DEDICATED NOZZLE
APPLIANCE
25.5 IN.
(647 mm)
MAX.
25.5 IN.
(647 mm)
MAX.
11.5 IN. (292 mm)
MAXIMUM
25.5 IN.
(647 mm)
MAX.
11.5 IN.
(292 mm) MAX.
Note:
On group appliance protection, start and end of EACH zone
group must be protected with a 245 nozzle.
GROUP “A”
NOZZLES
NOZZLES
11.5 IN. (292 mm)
MAXIMUM
GROUP “B”
45 IN.
(1143 mm)
END OF
ZONE
Note:
On group appliance protection, start and end of EACH zone
group must be protected with a 245 nozzle.
END OF
ZONE
40 IN.
(1016 mm)
45 IN.
(1143 mm)
40 IN.
(1016 mm)
Summary of Contents for R-102
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