SECTION 4 – SYSTEM DESIGN
UL EX3470 ULC EX3470
PAGE 4-74 REV. 11 2014-SEP-01
R-102 Restaurant Fire Suppression Manual
MECHANICAL GAS VALVE REQUIREMENTS
An ANSUL or ANSUL approved mechanical gas shut-off valve
system can be attached to the R-102 system. The system works
both mechanically and pneumatically by use of an air cylinder
located inside the regulated release assembly. Upon actuation
of the fire suppression system, a pneumatically-operated air
cylinder assembly will mechanically close the gas shut-off valve.
The total length of the cable for each mechanical gas valve must
not exceed 150 ft (45.7 m). The maximum number of pulley
elbows that may be used is 20 for each valve.
One pulley tee is allowed per cable system.
The maximum length of cable from the AUTOMAN to a gas valve
is 150 ft (45.7 m) with a maximum of 20 pulley elbows used per
side of the tee. As the tee is located farther from the AUTOMAN,
the 150 ft (45.7 m) maximum must be observed but as pulley
elbows are placed between the AUTOMAN and the tee, they
must be deducted from the available pulley elbows (20) allowed
on each side.
Example: If 10 pulley elbows are placed between the AUTOMAN
and the pulley tee, the maximum available pulley elbows left for
use on each side of the tee is 10 per side. See Figure 4-144 for
three different examples.
Parts that may be used for installation of a Mechanical Gas
Shut-off Valve are:
Description
Part No.
Gas Valve/Actuator 3/4 in. Assembly (ANSUL)*
55598
Gas Valve/Actuator 1 in. Assembly (ANSUL)*
55601
Gas Valve/Actuator 1 1/4 in. Assembly (ANSUL)* 55604
Gas Valve/Actuator 1 1/2 in. Assembly (ANSUL)* 55607
Gas Valve/Actuator 2 in. Assembly (ANSUL)*
55610
Gas Valve/Actuator 2 1/2 in. Assembly (ASCO)* 25937
Gas Valve/Actuator 3 in. Assembly (ASCO)*
25938
Pulley Elbow
423250
Pulley Elbow
415670
Pulley Tee
427929
1/16 in. Stainless Steel Cable
15821 or
50 ft (15.2 m) or 500 ft (152.4 m) roll
79653
Oval Press-To-Crimp Sleeve
4596
Stop Sleeve (2)
26317
* Assembly includes parts listed below:
Air Cylinder Assembly
15733
Air Cylinder
15521
Tubing Assembly
15529
Copper Tubing, 1/8 in.
15525
Male Elbow
15523
Male Connector
15522
Machine Screw (2)
15421
Hex Nut (2)
15527
Lockwasher (2)
4141
Visual Inspection Seal (2)
197
All valves above are UL listed and approved. They may be
mounted in any position. Pipe threads are type NPT. Ambient
operating temperature range of all valves is 32 °F to 120 °F
(0 °C to 49 °C). The valves are not weatherproof and must
be located indoors in areas approved by the “authority having
jurisdiction.”
ELECTRICAL GAS VALVE REQUIREMENTS
A UL Listed electrically-operated gas shut-off valve can be
attached to the R-102 system to provide an electrical means of
shutting off the gas line at a predetermined point. If an electric
gas shut-off valve is used in the system it must be attached
with both an electric (snap-action) switch and a manual reset
relay. For more information on the types of electric (snap-action)
switches, refer to the Electrical Switch, Field Installation section.
The manual reset relay is reviewed in this section.
All electrical connections should be performed by a QUALIFIED
ELECTRICIAN
and in accordance with authority having
jurisdiction.
The following is a brief explanation of how the R-102 system
operates with an Electric Gas Shut-off Valve attached:
With the regulated release cocked in the ready condition, the
normally closed contacts in the snap-action switch allow current
to flow to the manual reset relay. With the relay coil energized,
normally open contacts in the reset relay close, allowing the
solenoid in the gas valve to be energized.
Once the R-102 system is activated, the normally closed
contacts in the snap-action switch will open, de-energizing the
reset relay. This will, in turn, open the contacts in the relay which
will cause the gas valve to become de-energized and close.
The system must be re-armed and the “push to reset” button on
the reset relay must be operated to reopen the gas valve.
It is important to note that a power failure or an electrical power
interruption will cause the gas valve to close even though the
system was not fired.
In either case, whether in a fired condition or when a power
failure has occurred, the manual reset relay and electric gas
shut-off valve must be reset to resume a normal operating condi
-
tion.
For resetting, refer to the “Recharge and Resetting
Procedures” section in this manual.
Summary of Contents for R-102
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