Page
：
2 of 7
Document No.U025417
Date
：
Jan/11/2019
TECHNICAL DATA
Approvals:
c
UL
us
Listed
Sprinkler Identification Number (SIN):
SS8421
Maximum Working Pressure:
175psi (12.1bar)
Discharge Coefficient (Nominal K-Factor):
K=4.9 GPM/psi
1/2
(70.6 LPM/bar
1/2
)
Temperature Rating:
162
℉
/72
℃
Sprinkler
140
℉
/60
℃
Cover Plate
Vertical Adjustment:
3/8 inch (9.0 mm)
Cover Plate Finishes:
Standard Finishes-
White, Ivory, Beige, Brown, Black, Nickel,
Wood Grain
Custom Finishes-
Custom Color and custom pattern cover
plates are available on special order. Contact
a Senju Sprinkler representative with any
custom orders.
Please see chart on Page 7 for more detail.
Physical Characteristics:
Ref. Figure 1
OPERATION
In case of fire, the solder component that holds together the Cover Plate and the Retainer melts and as a result the Cover Plate
is released. The two Heat Collectors are exposed and when sufficient heat from the fire is recorded,
internal components of the
sprinkler to fall apart. This leads to the dropping of the Deflector into its operating position, allowing the water flow to be
distributed on the affected by fire area. (Ref. Figure 2)
FIGURE 2. OPERATION PROCESS
DESIGN CRITERIA
The herein stated rules for use and installation of Model CN-RES are provided by the manufacturer and must be strictly
implemented for safe and full results.
FIGURE 1. Model CN-RES K=4.9
Sprinkler Operation
Normal Condition
Cover Plate Operation
Water Discharge
NPT
1
2
Year of Manufacture
Country Origin
Temperature Rating
Listing Mark
Marking
ID Number (SIN)
6 Wrench Slots
2-
3
8
" (60mm)
7
6
5
2
3
1
4
1-
3
8
" (35mm)
COMPONENTS (MATERIALS) :
3- Deflector (Phosphorus Bronze)
2- Frame (Bronze)
1- Body (Copper Alloy)
5- Fusible Metal (Solder)
6- Heat Collector (Copper)
7- Cover Plate Assembly
4- Gasket (PTFE)
