SECTION 4 – SYSTEM DESIGN
UL EX3470 ULC EX3470
2014-SEP-01 REV. 11 PAGE 4-59
R-102 Restaurant Fire Suppression Manual
OVERLAPPING NOZZLE COVERAGE (Continued)
4. The overlapping appliance nozzles must be located 0 in. to
12 in. (0 mm to 304 mm) forward of the centerline or aimline
of the selected hazard zone. See Figure 4-115.
FIGURE 4-115
007537
TABLE 4-2
Overlapping System Piping Limitations
Max.
Total
3/8 in.
Max.
Max.
System
Flow
Pipe
No. of Elevation Cartridge
Size
Numbers Length
Elbows
Rise
Size
3 Gallon
6
75 ft
25
10 ft
LT-30-R
(11.4 L)
(22.9 m)
(3.0 m)
6 Gallon
12
75 ft
25
10 ft
Double
(22.7 L)
(22.9 m)
(3.0 m) Tank/
Manifolded
LT-A-
101-30*
9 Gallon
18
75 ft
25
10 ft
Double
(34.1 L)
(22.9 m)
(3.0 m) Tank/
LT-A-
101-30*
50 ft (15.2 m) maximum pipe from first to last nozzle.
50 ft (15.2 m) maximum pipe after the split on a split system.
*Use with regulated actuator only.
Overlapping Appliance Nozzle and Hazard Zone Locations
– Group Protection
1. For each group of protected appliances under a common
hood(s), the overlapping nozzles must be located from right
to left so that each end nozzle is located a maximum of
11.5 in. (292 mm) inside the outside edge of the cooking
hazard of each end appliance, and the inside overlapping
nozzles must be located between the two end nozzles at a
maximum spacing of 25.5 in. (647 mm). See Figures 4-116
and 4-117.
FIGURE 4-116
007538
FIGURE 4-117
001720
28 IN.
(711 mm)
ZONE
12 IN.
(304 mm)
40 IN.
(1016 mm)
45 IN.
(1143 mm)
BACK OF ZONE
FRONT
OF ZONE
CENTERLINE OF
HAZARD ZONE
245 OR 260 NOZZLE MUST BE AIMED STRAIGHT
DOWN OR BACK AT CENTERLINE OF HAZARD ZONE
25.5 IN. (647 mm) MAXIMUM
SPACING(S) BETWEEN
OVERLAPPING NOZZLES
11.5 IN.
(292 mm)
MAXIMUM
FROM
EDGE OF
COOKING
HAZARD
11.5 IN.
(292 mm)
MAXIMUM
FROM
EDGE OF
COOKING
HAZARD
FULL HOOD CONTINUOUS APPLIANCE PROTECTION
11.5 IN.
(292 mm)
MAXIMUM
FROM
EDGE OF
COOKING
HAZARD
11.5 IN.
(292 mm)
MAXIMUM
FROM
EDGE OF
COOKING
HAZARD
GROUP APPLIANCE PROTECTION
Note:
On group appliance protection, start and end of EACH zone
group must be protected with a 245 nozzle.
EDGE OF
COOKING
HAZARD
25.5 IN.
(647 mm)
MAXIMUM
25.5 IN. (647 mm)
MAXIMUM
11.5 IN. (292 mm)
MAXIMUM
245
260
245
245 245