Tyco MJC Series Manual

Series MJC Multiple Jet Controls
DN20, DN25, DN40, and DN50, 12 bar
BSPT Inlet & Outlets Threads
IMPORTANT
Refer to Technical Data Sheet
TFP2300 for warnings pertaining to
regulatory and health information.
Always refer to Technical Data
Sheet TFP700 for the "INSTALLER
WARNING" that provides cautions
with respect to handling and instal-
lation of sprinkler systems and com-
ponents. Improper handling and
installation can permanently damage
a sprinkler system or its compo-
nents and cause the sprinkler to fail
to operate in a fire situation or cause
it to operate prematurely.
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General
Description
The TYCO Series MJC Multiple Jet
Controls are control valves with self-
contained heat actuating units. Avail-
able in DN20 through DN50 pipe sizes,
they are designed for use as the system
control valve for fire protection systems
of limited size, where the MJCs are
located within the protected area. Upon
operation, the MJCs permit a flow of
extinguishing medium (usually water)
through open spray devices, such
as nozzles or non-automatic (open)
sprinklers.
The MJCs are typically used as an aux-
iliary deluge valve to control the flow of
Page 1 of 8
water to specific areas within a larger
wet pipe, dry pipe, or deluge system.
As such, they can be used with supply
piping from either a wet pipe system,
see Figure 1, or a dry pipe or deluge
system, see Figure 2.
In all cases, waterflow alarms are pro-
vided by the main automatic control
valve supplying the MJCs, for example,
alarm valves, dry pipe valves, or deluge
valves.
For smaller design areas, the MJCs
serve as an individual heat activation
point and control valve, see Figures 1A
and 2A. For larger design areas, the
MJCs can be set up to provide multiple
heat activation points, while still pro-
viding water flow through all discharge
points with the activation of only one
MJC, see Figures 1B and 2B. In this
example, water flows through the non-
operated MJC from outlet to outlet as
shown in Figure 8.
Features
• Available in four pipe sizes
• Fully automatic using proven frangi-
ble glass bulb as the heat detection
medium
• Installed upright (heat sensitive bulb
at top) for water supplies from either
a dry pipe or deluge system or pen-
dent (heat sensitive bulb at bottom)
for a water supply from a wet system
• Defined areas of protection to pro-
vide total coverage of specific zones
• DN25, DN40, and DN50 provided
with protective guard
NOTICE
The TYCO Series MJC Multiple Jet
Controls described herein must be
installed and maintained in compliance
with this document, as well as with the
applicable standards recognized by
the Approval agency, in addition to
the standards of any authorities having
jurisdiction. Failure to do so may impair
the performance of these devices.
The owner is responsible for main-
taining their fire protection system
and devices in proper operating con-
dition. Contact the installing contrac-
tor or product manufacturer with any
questions.
JUNE 2023
Worldwide
www.tyco-fire.com
Contacts
Technical
Data
Approvals
LPCB Approved
See Tables A, B, C, and D
Working Pressure Range
1,4 to 12,0 bar
Temperature Ratings
See Tables A, B, C, and D
Pressure Loss
See Graphs A and B
Construction
The TYCO Series MJC Multiple Jet Controls
are manufactured from cast iron, leaded gun
metal, copper, brass, nickle silver, and glass,
see Figures 3, 4, 5, and 6
Design
Criteria
Ambient Temperature
For normally wet pipe systems, do not
install TYCO Series MJC Multiple Jet
Controls in areas that are subject to
freezing.
Water Supply
Water should be free of particles and/
or site debris. Do not use sea or brack-
ish water.
Piping Arrangements
A "wet supply line" is typically being
supplied from an alarm valve, see
Figure 1, and the "dry supply line" is
typically being supplied from either
a dry pipe valve or deluge valve, see
Figure 2. Waterflow alarms, system
pressure gauges, and flow test capabil-
ity are therefore provided by the alarm,
dry pipe, or deluge valve.
TFP1346