FRC RTU 1 Operating Instructions Manual
REMOTE THROTTLE
FOR CUMMINS CELECT and CELECT+
ENGINES SERIES M11, N14, L10
MODEL : RTU 1
OPERATING INSTRUCTIONS
IDLE
REV1297NB RTU1.P65
PRESETPRESET
PRESET
PRESETPRESET
INCREASE
FRC
s
12001200
1200
12001200
s
SETTING
DECREASE
RTU
FIRE RESEARCH CORP. 26 Southern Blvd., Nesconset, NY11767
TEL ( 516 ) 724-8888 FAX ( 516 ) 360-9727
TOLL FREE 1-800-645-0074
Page 1
RTU
Remote Throttle
Introduction:
The R TU is a state of the art electronic remote throttle designed for fire apparatus
equipped with the Cummins CELECT and CELECT+ electronic engine control
system. This includes the M11, N14 and L10 series engines. The RTU is connected
to the CELECT or CELECT+ through the J1922 data link via a twisted pair cable.
This arrangement allowes the MP ( master processor ) of the R TU to communicate
with the ECM (electronic control module) of the engine constantly . The RTU can be
used to vary the engine speed through use of the "INCREASE" and "DECREASE"
pushbuttons. A "PRESET" switch allows an operator to quicly bring the engine RPM
to a predetermined value with one press of a button.
An optional high idle kit (PRO-38H) may be purchased that plugs directly into the
R TU that allows engine RPM to be brought to a preselected RPM value through a
toggle switch. Wiring for this option can be found in Fig 7 of this manual.
REV1297NB RTU1.P65
Page 2
MECHANICAL INSTALLATION
Before proceeding with any installation, please check to make sure you have the folÂlowing components. STOP and call the factory if any components are missing. ComÂponents supplied are as follows :
1) Throttle controller
2) Extension cable for power
3) Extension cable for J1922 data link
MECHANICAL - installing the display module
The control module can be mounted anywhere on the pump panel. The display module
has a square flange with overall dimensions of 4.25"X4.25". A cutout hole of 3.75" in
diameter is required to fit the cylindrical can of the module into the panel. Insert the
Throttle controller into the cutout hole and locate the four bolt holes. The holes are for
10-32 screws and are set up on a 3.5" bolt square at the four corners of the flange.
REV1297NB RTU1.P65
(Some units are longer)
Page 3
ELECTRICAL INSTALLATION
Wiring for the RTU 1 system is very simple. Refer to fig 1 below. All extension cables are
supplied with unique connectors that simplify the interconnections. See fig 2 for cables.
1) Use the extension cable supplied, provide 12VDC and ground to the electronic
module on the wire labeled POWER on the back of the module. Leave the white wire
disconnected until step 3.
2) Connect the cable for the J1922 data link. The J1922 datalink is a data wire consisting
of two wires leading from connector A of the ECM. On more recent Cummins ECMs
(CELECT+),
pin 5 on connector A of the ECM is the positive (+) (wire #020) and should
be connected to the R TU's red DATA J1922 wire. Pin 23 is the negative (-) (wire #021)
and should be connected to the R TU's black DATA J1922 wire. The cable used is a
shielded twisted pair cable.
NOTE:
If you have an older Cummins CELECT engine, there may be a 2 pin Packard connector
for the J1922 data link located near the CELECT ECM by the bulkhead. Check that the
positive (+) wire comes from pin 10 on the A connector. The negative (-) comes from pin
20 on the A connector.)
3) The R TU will not be active until you provide 12V to the white wire. This connection
should be wired through the pump engaged interlock and the parking brake for safety . In
this manner, the RTU will not receive an "active" signal until these conditions are met.
4) If HIGH IDLE option was
CONTROL MODULE
ordered, refer to Figure 7 for
wiring instructions.
REV1297NB RTU1.P65
RED = 12 VDC
BLACK = GND
WHITE = Interlock.
12VDC signal required
FIG 1.
1
CELECT
ECM
RTU 1
2
Page 4
Power cable
1
J1922 data link cable
2
High Idle cable
3
3
HIGH
IDLE
Refer to Figure 7
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