Griddle Protection 1W (1-Flow) Nozzle – Low Proximity
Application
15 in. to 20 in. (381 mm to 508 mm) above the cooking surface.
The low proximity 1-flow nozzle application for the protection of
griddles requires the 1W nozzle.
The nozzle is stamped with 1W indicating that this is a one-flow
nozzle and must be counted as one flow number.
When using the 1W nozzle for low proximity griddle protection
with our without obstruction, the maximum length of the cooking
surface to be protected must not exceed 26 in. (660 mm). The
nozzle must be centered at one end of the maximum 26 in.
(660 mm) length, aimed along a centerline to a point 20 in. (508
mm) from the end of the length, protecting a maximum width of
20.5 in. (520 mm).
The 1W nozzle tip must be positioned at or below the obstruc
-
tion, if present. The protected area begins at the point straight
down from the nozzle tip. The nozzle can be positioned above
the edge of the hazard area to be protected. See Figure 4-51
and 4-52.
Note:
If the hazard area exceeds the single nozzle coverage
listed above, additional nozzles will be required. The additional
nozzle can be positioned in front at high proximity or at the side
at low proximity.
FIGURE 4-51
FIGURE 4-52
Chain Broiler Protection
The following listed protection guidelines can be applied to any
manufacturer’s chain broilers, if the chain broiler meets the
specified parameters. Chain broilers utilizing catalytic converters
can be protected from overhead using model specific protec
-
tion identified in the “Specific Application by Model” section in
System Design. Or, they can be protected with standard 1N
nozzle horizontal chain broiler protection with the nozzles posi
-
tioned at either end of the chain broiler openings. Refer to the
“Horizontal Chain Broiler Protection” section for specific design
information.
Horizontal Chain Broiler Protection
The R-102 system can use two 1N nozzles for horizontal chain
broiler protection. The nozzle is stamped 1N, indicating that
this is a one-flow nozzle and must be counted as one flow
number (total of two flow numbers for each chain broiler being
protected).
Two 1N nozzles are always needed for chain broiler protec
-
tion when the hazard area to be protected does not meet the
“Overhead Broiler Protection” requirements. The maximum
internal size of the broiler is 43 x 31 in. (1092 mm x 787 mm).
The nozzles must be positioned at each end of the enclosed
cooking chamber 1 to 3 in. (25 mm to 76 mm) above the surface
of the chain and a maximum distance of 4 in. (101 mm) away
from the broiler opening. The nozzles may be mounted at either
corner as long as they are at opposite ends of the chain broiler
and positioned to discharge diagonally across the top of the
chain. See Figure 4-53 and 4-54.
000245
FIGURE 4-53
15 – 20 IN.
(381 – 508
mm
)
20 IN.
(508
mm
)
007924
AIM
POINT
26 IN.
(660
mm
)
20 IN.
(508
mm
)
20.5 IN.
(520 mm)
007926
AIM POINT
PROTECTED AREA
1 – 3 IN.
(25 – 76 mm)
000246
SECTION 4 – SYSTEM DESIGN
UL EX3470 ULC EX3470
2014-SEP-01 REV. 11 PAGE 4-21
R-102 Restaurant Fire Suppression Manual
