SECTION 3 – SYSTEM DESIGN
UL EX3830 ULC EX3830
2014-NOV-10 REV. 06 PagE 3-7
KITCHEN KNIGHT II Restaurant Fire Suppression Manual
NOZZLE COVERAGE AND PLACEMENT (Continued)
Appliance Protection (Continued)
2a. High-Proximity Backshelf Protection
– When using the
2L nozzle for range protection with high-proximity back-
shelf, the maximum length of burners being protected must
not exceed 28 in. (711 mm) and the maximum area of the
burners must not exceed 336 in.2 (21677 mm2). The back-
shelf must be a minimum of 18 in. (458 mm) above the top
of the range and may overhang the burner by a maximum
of 11 in. (279 mm).
Note:
although most shelves exceed 11 in. (279 mm) in
overall depth, make sure the shelf does not exceed 11 in.
(279 mm) overhang of the burner.
Nozzle must be located on the front edge of the front burner
and aimed at a point 10 in. (254 mm) forward from the
back edge of the back burner on the front-to-rear center-
line. Nozzle must be mounted 24 in. to 35 in. (610 mm to
889 mm) above the hazard surface. See Figure 3-12.
18 IN.
(457 mm)
MIN.
24-35 IN.
(610-889 mm)
MaX. 28 IN.
(711 mm)
FRONT TO REaR
CENTERLINE
SHELF CaN OVERHaNg BURNER(S)
a MaXIMUM OF 11 IN. (279 mm)
HIgH PROXIMITY BaCK SHELF PROTECTION WITH THE 2L NOzzLE.
aREa OF PROTECTION PER NOzzLE: MaX. LENgTH OF BURNER
gRaTES 28 IN. (711 mm) aND MaX. aREa OF BURNER gRaTES
NOT TO EXCEED 336 IN. (21677 mm)
10 IN. (254 mm)
FROM BaCK
BURNER
006845
FIGuRE 3-12
3. Larger Burner Range
(784 in.
2
(50580 mm
2
) maximum,
28 in. (711 mm) longest side maximum)
One nozzle is available for large range protection: High
proximity.
The Model 2L Nozzle (Part No. 551027) is used for high
proximity large range protection. This nozzle is a two flow
nozzle.
when using high proximity protection, the range
cannot be under a backshelf.
This nozzle must be located
34 in. to 48 in. (864 mm to 1219 mm) above the cooking
surface, and aimed directly down within the mounting
area, based on the hazard size, as described in the Nozzle
Positioning Chart. See Figure 3-13.
006411
2L
R
L
W
48 IN.
(1219 mm)
34 IN.
(864 mm)
FIGuRE 3-13
Example:
a four burner range has a hazard size of 20 in.
(508 mm) in length and 27 in. (685 mm) in width. Follow
down the Range Length in Table 3-4: Nozzle Positioning
until you come to 20 in. (508 mm). Continue down this
column until the correct width appears in the width column.
When the width of 27 in. (685 mm) is reached, read across
to the radius column to determine the size of radius allowed,
for positioning of the nozzle, from the hazard area center-
line. In this example, the correct radius is 3 in. (76 mm). The
nozzle can be aimed straight down anywhere within a 3 in.
(76 mm) radius of the hazard area centerline.
TABLE 3-4: NOZZLE POSITIONING
Range
Range
Length - L
width – w
Radius – R
in. (mm)
in. (mm)
in. (mm)
18
(457)
18
(457)
7 1/8
(180)
18
(457)
19
(482)
6 3/4
(171)
18
(457)
20
(508)
6 3/8
(161)
18 (457)
21 (533)
6
(152)
18
(457)
22
(558)
5 5/8
(142)
18
(457)
23
(584)
5 1/4
(133)
18
(457)
24
(609)
4 3/4
(120)
18
(457)
25
(635)
4 3/8
(111)
18 (457)
26 (660)
4
(101)
18
(457)
27
(685)
3 5/8
(92)
18
(457)
28
(711)
3 1/8
(79)
