83-KRS100-001
September 2002
1
KRS-100 Nitrogen Releasing System
KRS-100 NITROGEN RELEASING SYSTEM
Application, Operation, and Maintenance
of KRS-100 Pneumatic Releasing Device
1-1
SCOPE
This manual is to be used in conjunction with the UL Listed
and Factory Mutual Approved Kidde Industrial Dry Chemi-
cal Instruction Manual (P/N 220423) dated November 1998,
and the Kidde Wet Chemical Instruction Manual (P/N 87-
122000-001) dated February 1997. All other system limita-
tions (control head, detection, manual pull, gas valve, etc.)
must be in accordance with the respective instruction manu-
als.
2-1
GENERAL DESCRIPTION
The KRS-100 releasing device consists of a nitrogen cylin-
der (P/N 83-100004-001) and actuator valve assembly (P/
N 83-100010-001). The nitrogen cylinder is pressurized to
1800 psig (70°F).
The function of the KRS-100 releasing device is to provide
a pressure-operated means for releasing Kidde pre-engi-
neered wet chemical and dry chemical fire-suppression sys-
tems. The KRS-100 utilizes the Kidde pre-engineered
mechanical, pneumatic rate of rise, electric, and tandem
control heads, any of which can be mounted on the KRS-
100 actuator valve assembly.The release is accomplished
using KRS-100 cylinder pressure discharged through cop-
per tubing into pressure-operated actuators (P/N 87-
100012-001 or 87-120042-001) located on Kidde
pre-engineered wet or dry chemical system cylinders. (See
Figure 1 and Figure 2.)
Note:
Pressure Operated Actuators (POA) P/N 87-
100012-001 and System Valve Actuators (SVA) P/
N 87-120042-001 cannot be mixed on any system.
Use only one type on a system.
When pressure from the KRS-100 cylinder is applied, the
piston in the pressure-operated actuator pushes on the
chemical cylinder valve stem.
The piston remains in place (extended) until the pressure
in the copper tubing is bled off and the pressure in each
pressure-operated actuator is released. Pushing down on
the valve core of the pressure-operated actuator releases
this pressure.
Note:
Pressure in the pressure-operated actuator must
be released before removing the actuator from the
agent storage cylinder. (See Figure 1.)
In addition to the pressure-operated actuator, the KRS-100
can also be used to operate pressure-operated switches
(P/Ns 486536 and 486536-010).
A minimum of two and maximum of ten agent storage cyl-
inders can be operated from one KRS-100. Up to 3 pres-
sure-operated switches can be installed on the KRS-100
actuation line.
Multiple KRS-100 releasing units may be used when the
number of agent storage cylinders exceeds the maximum
capacity of one KRS-100 releasing unit. The KRS-100 sys-
tem is fully modular and is expandable to fit any size appli-
cation.
Two or more KRS-100 cylinders may be used when utiliz-
ing two or more different types of detection to cover the
same hazard. An example would be the use of a com-
bination of pneumatic rate-of-rise and fixed-temperature
electric detection in a hazard. In this example a pneumatic
rate of rise control head would be used on one KRS cylin-
der and an electric control head on the other. Operation of
either detection system would release the extinguishing
system by means of the KRS-100 releasing device to which
it is connected. Refer to proper Kidde Instruction Manual
listed in the scope of this addendum (Paragraph 1) for pneu-
matic detection, pneumatic control head, electric detection
and electric control-head installation details. If using a Kidde
control panel refer to the Installation Manual for the control
panel for detection and control installation details.
There are numerous applications where the use of the KRS-
100 simplifies the overall installation of an extinguishing
system. It is often more convenient and economical to in-
stall the extinguishing system cylinders so that each is in
close proximity to the space it protects rather than having
all cylinders mounted together in a bank. Piping is thus kept
to a minimum. Such an arrangement is conveniently imple-
mented by the KRS-100.
Other applications include those where the hazard area is
unsuitable for standard control heads. Here we can use
the KRS-100 cylinder installed outside the unsuitable area
with the actuation tubing run to the extinguishing system
cylinders located within the area.
The KRS-100 is ideally suited to a hazard consisting of
kitchen range hoods on two or more floors, connected to a
common exhaust duct. For this type of hazard each kitchen
hood would be protected with an independent wet or dry
chemical system. The detection for each hood, however,
would be connected to a KRS-100 cylinder on its floor rather
than to the wet or dry chemical system.
The KRS-100s on the various floors would be connected
to each other and to each wet or dry chemical system. A
fire at any hood would thus release all of the systems. In
this way the entire hazard consisting of all the hoods and
the common duct would be protected as required without
the necessity of a complicated common detection system,
