Kidde Technologies SR2033 Manual

OPERATION & MAINTENANCE MANUAL
FOR
NFI 40FT CNG BUSES AT
BC TRANSIT
(SR2033, SR2087 & SR2156)
Manual No: 181922
Revision B: Oct 25, 2017
PROPRIETARY NOTICE
THIS DOCUMENT IS THE PROPERTY OF UTC AEROSPACE SYSTEMS. YOU MAY NOT POSSESS, USE, COPY OR DISCLOSE THIS
DOCUMENT OR ANY INFORMATION IN IT, FOR ANY PURPOSE, INCLUDING WITHOUT LIMITATION, TO DESIGN, MANUFACTURE OR
REPAIR PARTS, OR OBTAIN ANY GOVERNMENT APPROVAL TO DO SO, WITHOUT UTC AEROSPCE SYSTEMS’ EXPRESS WRITTEN
PERMISSION. NEITHER RECEIPT NOR POSSESSION OF THIS DOCUMENT ALONE, FROM ANY SOURCE, CONSTITUTES SUCH
PERMISSION. POSSESSION, USE, COPYING OR DISCLOSURE BY ANYONE WITHOUT UTC AEROSPACE SYSTEMS’ EXPRESS
WRITTEN PERMISSION IS NOT AUTHORIZED AND MAY RESULT IN CRIMINAL AND/OR CIVIL LIABILITY.
EAR NOTICE
SUBJECT TO THE EAR, ECCN [EAR99].
THIS INFORMATION IS SUBJECT TO THE EXPORT CONTROL LAWS OF THE UNITED STATES, SPECIFICALLY INCLUDING THE
EXPORT ADMINISTRATION REGULATIONS (EAR), 15 C.F.R. PART 730 ET. SEQ. TRANSFER, RETRANSFER, OR DISCLOSURE OF THIS
DATA BY ANY MEANS TO A NON-U.S. PERSON (INDIVIDUAL OR COMPANY), WHETHER IN THE UNITED STATES OR ABROAD,
WITHOUT ANY REQUIRED EXPORT LICENSE OR OTHER APPROVAL FROM THE U.S GOVERNMENT IS PROHIBITED, INCLUDING
WITHOUT LIMITATION ANY DIVERSION TO A MILITARY END USER OR USE IN A MILITARY END USE APPLICATION.

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TableofContents
INTRODUCTION..................................................................................................................................................3
BLOCKDIAGRAM...............................................................................................................................................3
SYSTEMOPERATION..........................................................................................................................................4
NORMALCONDITION................................................................................................................................................4
FIRESCENARIO..........................................................................................................................................................4
GASTRACELEAK(20%LEL)SCENARIO........................................................................................................................4
GASSIGNIFICANTLEAK(50%LEL)SCENARIO.............................................................................................................5
SYSTEMFAULTSCENARIO.........................................................................................................................................5
COMPONENTDESCRIPTION................................................................................................................................5
PROTECTIONPANEL(413484‐1345)..........................................................................................................................5
MANUALACTIVATIONSWITCH(421317)..................................................................................................................7
SPOTTHERMALDETECTOR(420419‐350).................................................................................................................8
GASLEAKDETECTOR(420473‐2050).........................................................................................................................9
END‐OF‐LINEDEVICE(420241)................................................................................................................................10
DISTRIBUTIONBLOCK(420588).................................................................................................................................10
NOZZLE(474946)....................................................................................................................................................10
ELECTRICALINTERCONNECTIONS...........................................................................................................................11
SYSTEMRESET..................................................................................................................................................12
FIRE:........................................................................................................................................................................12
TRACEGASLEAK:.....................................................................................................................................................13
SIGNIFICANTGASLEAK:..........................................................................................................................................13
PERIODICMAINTENANCE..................................................................................................................................14
PRE‐TRIP..................................................................................................................................................................14
EVERY3000MILESORMONTHLY(WHICHEVEROCCURSFIRST)......................................................................................14
EVERY18000MILESORSEMI‐ANNUALLY(WHICHEVEROCCURSFIRST)..........................................................................15
EVERYSIXYEARS......................................................................................................................................................15
EVERYTWELVEYEARS.............................................................................................................................................15
ADDITIONALINSPECTIONS......................................................................................................................................15
TROUBLESHOOTINGGUIDE...............................................................................................................................16
REPLACEMENTPARTSLIST................................................................................................................................20
CONTACTINFORMATION..................................................................................................................................21
REVISIONHISTORY............................................................................................................................................21


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INTRODUCTION
This manual describes the operation and maintenance of the Kidde Automatic Fire Detection
and Suppression System (AFSS) and Gas Leak Detection System (GDS) as installed on the
NFI 40ft CNG buses at BC Transit.
The AFSS system is of a 1 Zone, 1 Shot type configuration. The fire detection system provides
fire detection coverage for the engine compartment and consist of:
Three (3) spot thermal detectors in the engine compartment
The suppression system provides extinguisher coverage for the engine compartment and
consist of:
A single fire extinguisher
A four (4) nozzle distribution system
The GDS provides gas leak detection coverage for vehicle. Four (4) gas detectors are installed:
Two (2) in the roof tank area
One (1) in the area above the CNG fill
One (1) in the engine compartment
BLOCK DIAGRAM
A system block diagram is shown in Figure 1.
FIGURE 1 – SYSTEM BLOCK DIAGRAM

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SYSTEM OPERATION
The state of the system is constantly monitored and is displayed to the driver via the protection
panel. The system provides visual and audial indicators to the driver when the state of the
system changes.
NORMAL CONDITION
During normal operating conditions (appropriate system power applied and no fault conditions
present), the protection panel’s system “OK” indicator is illuminated solid green.
FIRE SCENARIO
When a fire sensor detects a fire in the engine compartment, the Protection Panel’s FIRE
ALARM and the DELAY ENGINE STOP indicators illuminate, an audio alarm sounds, and the
HVAC shuts down immediately. Fifteen (15) seconds later the engine automatically shuts down
and the fire extinguisher automatically discharges.
Engine shutdown and extinguisher discharge may be delayed an additional fifteen (15) seconds
by depressing the Protection Panel’s DELAY ENGINE STOP indicator/switch.
The Manual Activation Switch may be activated to immediately discharge the Fire Extinguisher
and shutdown the engine and HVAC.
The system must be reset and the extinguisher removed and replaced in accordance with the
System Reset portion of this manual.
WARNING! THE ENGINE WILL STOP 15 SECONDS AFTER THE FIRE ALARM STARTS.
THE OPERATOR MUST BE PREPARED TO BRING THE VEHICLE TO A SAFE
STOP AS SOON AS THE ALARM SOUNDS. STEERING MAY BECOME
DIFFICULT AFTER ENGINE SHUTDOWN. IF MORE TIME IS REQUIRED, THE
“DELAY ENGINE STOP” SWITCH MAY BE PRESSED AND RELEASED FOR
AN ADDITIONAL 15 SECOND DELAY.
WARNING! THE EXTINGUISHER DISCHARGE MAY CAUSE AN OBSCURING CLOUD
BEHIND AND NEAR THE VEHICLE.
GAS TRACE LEAK (20% LEL) SCENARIO
When a gas sensor detects a trace leak, the Protection Panel’s GAS LEAK indicator illuminates
(blinking).
The system will reset itself and indications will clear when the gas dissipates below the trace
leak threshold.

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GAS SIGNIFICANT LEAK (50% LEL) SCENARIO
When a gas sensor detects a significant leak, the Protection Panel’s GAS LEAK indicator
illuminates (steady-on) and an audio alarm sounds. The gas LEAK indicator and the audible
alarm warnings will stay on until the TEST/RESET button on the Protection Panel is pressed.
The status indicator on the individual Gas Leak Detector that detected the significant gas leak
will remain illuminated solid red until the system is reset in accordance with system reset portion
of this manual.
SYSTEM FAULT SCENARIO
The Protection Panel continuously monitors system integrity and displays the status via the
SYSTEM OK, FIRE TROUBLE, and GAS TROUBLE indicators. Refer to the Component
Description, Protection Panel portion of this manual for the operational description of the
indicators.
COMPONENT DESCRIPTION
PROTECTION PANEL (413484-1345)
The protection panel is located in the driver’s area and displays the current system status. The
Protection panel comprises the following:
SYSTEM OK indicator
oIlluminates solid green when appropriate power is applied to the system and no
trouble conditions exists
oIlluminates blinking green when power is low (under 22VDC)
oOff when power is insufficient
oOff when TROUBLE indicator is illuminated
FIRE TROUBLE indicator
Illuminates blinking yellow when a fault exists in the fire detection and suppression
circuits
Fire ALARM indicator
oIlluminates solid red when a fire is detected
oIlluminates blinking red when the MANUAL DISCHARGE switch is activated
Gas TROUBLE indicator
Illuminates solid yellow when a fault exists in the gas detection circuit
Gas ALARM indicator
oIlluminates blinking red when trace gas is detected (greater than 20%, but less than
50%)
oIlluminates solid red when significant gas is detected (greater than 50%)
Audible alarm
oIntermittent sound indicates fault condition when SYSTEM OK indicator is
extinguished
oIntermittent sound indicates low power condition when SYSTEM OK indicator is
blinking
oContinuous sound indicates fire alarm, manual discharge, or significant gas alarm

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ALARM SILENCE switch
oUse to silence the audible alarm
TEST/RESET switch with DELAY ENGINE STOP indicator
During normal “System OK” state:
oAllows testing of indicators and audible alarm during standby operation
During Fire Event:
oIlluminates solid red when fire event is detected
oIlluminates blinking red when pressed and released for a 15 second additional delay.
oReturns to solid red illumination after additional time delay had elapsed
oTurns off when the shutdown signal has been activated
oResets protection panel when pressed and released after a fire event or significant
gas leak
Early warning signal output
Engine shutdown signal output
Manual activation switch signal input
Operating Temperature Range -40⁰F to 158⁰F (-40⁰C to 70⁰C)
Quiescent Current 50mA (Nominal) @ 24V
Operating Voltage 9 to 32Vdc
FIGURE 2 - PROTECTION PANEL

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MANUAL ACTIVATION SWITCH (421317)
The Manual Activation Switch allows immediate system activation (extinguisher discharge and
engine shutdown) by the vehicle operator at any time. Activation of the switch is accomplished
by twisting and pulling the tamper seal (not shown) to remove, lifting the cover and pressing the
red “FIRE” button for more than half a second. After the Manual Activation Switch has been
activated, the Protection Panel’s FIRE ALARM indicator will blink until power has been cycled to
the system.
FIGURE 3 – MANUAL ACTIVATION SWITCH
(Depicted without Tamper Seal)

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SPOT THERMAL DETECTOR (420419-350)
Spot Thermal detectors are point thermal switches which work by contact closure to initiate an
alarm when the temperature of the area surrounding the detector exceeds its pre-set alarm
temperature. The detectors reset themselves automatically once the temperature falls below the
pre-set alarm temperature.
Operating Temperature Range -40⁰F to 257⁰F (-40⁰C to 125⁰C)
Quiescent Current 0mA (Nominal) @ 24V
Operating Voltage 9 to 32Vdc
Alarm Temperature 280°F (Blue bodied sensor)
350°F (Red bodied sensor)
450°F (Green bodied sensor)
Response Time Within 60 seconds of exposure
to flame
FIGURE 4 – SPOT THERMAL DETECTOR

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GAS LEAK DETECTOR (420473-2050)
The PM-MDS Gas Leak Detector utilizes a temperature compensated metal-oxide sensing
element to detect combustible gases including CNG and LNG. The detector contains two
preset detection thresholds:
Trace alarm (20% LEL of Methane)
Significant alarm (50% LEL of Methane)
The PM-MDS Gas Leak Detector contains a Bi-colored status LED which indicates:
Status LED Indication
Solid Green Sensor operational
Flashing Red Trace Gas level detected (between 20% and 50% LEL)
Solid Red Significant Gas level detected (50% LEL or higher)
Flashing Red/Green Sensor Fault
No LED Sensor without power
NOTE: The status LED illuminates blinking green for the first 30 seconds after
power-up.
After a significant gas leak is detected, power to the detector must be cycled to reset the status
LED.
CAUTION! CARE SHOULD BE TAKEN WHEN CLEANING THE COMPARTMENTS WHICH
HOUSE GAS LEAK DETECTORS; AVOID EXPOSURE TO SILICONES OR
SOLVENTS AND AVOID DIRECTLY HITTING WITH HIGH-PRESSURE STEAM
CLEANING OR PRESSURE WASHING SPRAY.
The gas sensing element inside the detector is a consumable item with a limited service life
dependent on environmental conditions. The sensing element is field replaceable and is
included in the Combustible Gas Detector Rebuild Kit (P/N 420483).
Operating Temperature Range -40⁰F to 185⁰F (-40⁰C to 85⁰C)
Quiescent Current 40mA
Operating Voltage 9 to 32Vdc
Response Time Within 90 seconds of exposure
to alarm level concentration
Field Calibration Not Required
FIGURE 5 - PM-MDS GAS LEAK DETECTOR

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END-OF-LINE DEVICE (420241)
The End-of-Line device is required for supervision of the fire and gas detection circuits. It
consists of a resistor installed into a connector and is environmentally sealed with potting
compound. The End-of-Line device is installed on the last detector in each series of detectors.
FIGURE 6 – END-OF-LINE DEVICE
DISTRIBUTION BLOCK (420588)
The distribution block is a manifold that is used as part of the distribution system to direct the
flow of dry chemical fire extinguishing agent from the extinguisher to individual nozzles.
The distribution block is constructed of plated steel and contains an integral mounting flange. It
has one ¾” NPT female inlet port and four ½” NPT female outlet ports.
FIGURE 7 – DISTRIBUTION BLOCK
NOZZLE (474946)
This nozzle is constructed of plated steel and contains a 45° steel cone, causing the nozzle to
disperse a cone shaped spray of dry chemical. The nozzle has a silicone rubber protective cap
that is blown off by the dry chemical discharge.
FIGURE 8 – NOZZLE