SECTION 4 – SYSTEM INSTALLATION
UL EX3830 ULC EX3830
PagE 4-20 REV. 06 2014-NOV-10
KITCHEN KNIGHT II Restaurant Fire Suppression Manual
Fusible Link Detector Installation
The Model EN-MCU3 Enclosure can support a fusible link
detection system. The Model EN-S Enclosure cannot support
a fusible link detection system and must be used in conjunction
with the Model EN-MCU3 Enclosure or a Model MCH3/ECH3/
NMCH3 Control Head.
after mounting the enclosure, the fusible link line can be
installed. The first step to installing the fusible link line is to install
the detector brackets. These brackets must be installed in the
plenum area of the ventilation hood over all protected appliances
and in each duct. See Section 3 – System Design for detector
placement guidelines. Connect the fusible link brackets together
using 1/2 in. EMT conduit and the conduit connectors supplied
in the detector kit (Model FLK-1/1a). PYRO-CHEM KITCHEN
KNIgHT II corner pulleys must be used whenever a change in
conduit direction is necessary. The conduit is connected to the
enclosure through a top knockout.
See “Fusible Link Detector Installation” section (Pages 4-4 –
4-7) for fusible link installation guidelines. Before attaching the
stainless steel cable to the fusible link line ratchet wheel, it must
be run below the fusible link line pulley in the enclosure. See
Figure 4-33.
FIGURE 4-33
002947PC
Setting the Model EN-MCU3
after the last link in the series is connected, the cable should be
fed through the conduit back to the Model EN-MCU3. It must be
fed under the fusible link line pulley and through the hole in the
fusible link ratchet wheel. The line must then be crimped, and
the crimp positioned inside the ratchet wheel.
NOTICE
Crimps must always be used in conjunc-
tion with two cable lengths. Loops are the
accepted method of connecting the cable to
mechanical components.
The crimp must
never be used on a single cable.
Exception:
Single cable crimp allowed in detection and
gas valve ratchet wheel using Stop Sleeve
(Part No. 26317) (Packages of 10: Part No.
24919).
The fusible link line can now be put into a set position by
tensioning the fusible link line. This is accomplished by using
a 1/2 in. hex wrench on the fusible link line ratchet wheel. The
ratchet wheel will be ratcheted in a clockwise direction until the
spring plate is parallel to the top of the enclosure. The fusible
link line is now in a set position.
Note:
Tension must be set on fusible link detection line before
control head can be set.
Once the fusible link line is set, the Model EN-MCU3 Enclosure
can be placed in the set position. To set the Model EN-MCU3,
the slide plate is moved from right to left, ensuring the bolt
extending from the cam arm is in the slot provided in the slide
plate. Continue moving the slide plate to the left until the latching
arm is in the locked position. Insert the pull pin into the hole in
the slide plate above the latching arm. This will lock the control
mechanism in the set position, eliminating accidental actuation
during the rest of the installation procedure. See Figure 4-33.
Remote Pull Station Installation
The Model RPS-M Remote Mechanical Pull Station is used
for remote manual actuation of the Model EN-MCU3 It is to
be located near an exit in the path of egress from the hazard.
Height and location of pull station should be determined in
accordance with the authority Having Jurisdiction.
The Pull Station is connected to the Model EN-MCU3 using 1/16
in. (1.6 mm) diameter stainless steel cable. The cable enters the
Model EN-MCU3 through a knockout in the top of the enclosure.
See Figure 4-33.
See “Remote Pull Station Installation” section (Pages 4-8 – 4-9)
for remote pull station installation guidelines.
Gas Shut-off Valve Installation
The Model EN-MCU3 can be used to operate a mechanical
gas shut-off valve. This valve is located in the fuel gas supply
line to the cooking appliance(s). The valve body has an arrow
which indicates direction of gas flow through the valve. The gas
shut-off valve is spring loaded and requires five pounds of force
to hold it open. This force is supplied by a 1/16 in. diameter
(1.6 mm) stainless steel cable that is connected to the Model
EN-MCU3.
See “gas Shut-off Valve Installation” section (Page 4-11 – 4-12)
for gas valve shut-off installation guidelines.
after the valve is installed in the gas line, 1/2 in. conduit must be
run from the top center knockout of the gas valve box to the top
or bottom knockout in the enclosure. See Figure 4-32. a PYRO-
CHEM KITCHEN KNIgHT II corner pulley is used wherever a
change in conduit direction is required.
Remove the gas valve cover and thread the stainless steel cable
through the conduit back to the Model EN-MCU3. If the cable
enters the enclosure through the bottom knockout, the cable
must be run over the gas valve line pulley (see Figure 4-34).
If the cable enters the enclosure through the top knockout, the
cable must be run under the gas valve line pulley (see Figure
4-35). Thread the cable through the hole in the gas valve ratchet
wheel. The line must then be crimped, and the crimp positioned
inside the center of the ratchet wheel.
