ISSPRO R4023-24VDC - Manual

ISSPRO, INC. 2515 N.E. Riverside Way, Portland OR 97211
Telephone: (503) 288-4488 Š Toll Free: (800) 888-8065
FAX: (503) 249-2999
Form No. IS051 - (10/31/00 Rev. B) Page 1 of 5
Engine Shutdown Installation Instructions
R4020, R4020-24VDC (Complete Kit with 30 second delay control box)
R4021, R4021-24VDC (Complete kit with zero delay control box)
R4022, R4022-24VDC (Control box only with 30 second delay, used in R4020 kit)
R4023, R4023-24VDC (Control box only with zero delay, used in R4021 kit)
Please read completely before beginning your installation!
When voltage is referred to in the directions it means either 12 volts
or 24 volts DC, depending on the unit you have purchased
Systems and Shutdown in General
There are two different types of shutdown systems that can be purchased for engine protection.
Failsafe Systems
These ISSPRO Electronic Engine Protection Systems are NOT of this type. A failsafe system will cause engine shutdown
should any part of the shutdown system fail (i.e. broken wires, faulty sensors, malfunctioning control box, etc.) While this
is desirable, especially for unattended engines, it is costly to implement and can also inconvenience operations if there is
actually nothing wrong with the engine operation. However, a regularly tested and inspected non-failsafe system, such as
provided by ISSPRO, will give reliable security for your engine for many years.
Non-Failsafe Protection Systems
ISSPRO Electronic engine Protection Systems are of this type. They have been well designed to provide the maximum in
engine protection at a reasonable price. (i.e. There is no protection against failure in the wiring or sensors, connected to
the ISSPRO control box.
How They Operate
R4020 and R4022 with 30 second delay:
When ignition is turned on, the control box is powered by the vehicle electrical system. When the engine is started, the
alarm will be on until sufficient oil pressure is built up to overcome the oil pressure switch. After normal operating
conditions have been established, should an engine fault occur, such as low water level, low oil pressure, high water
temperature, etc., the alarm will sound immediately. If the fault condition continues for longer than 30 seconds, the
control box activates and shuts down the engine. At any time, the unit can be reset by turning the ignition off and then
back on again.
R4021 and R4023 with Zero Delay for Stationary Engines:
After ignition on, there is a 15 second period before the shutdown system is active to enable the engine to build oil
pressure. Any time after the 15 second period has passed, if a fault is detected or present, the shutdown device relay will
activate immediately. If oil pressure does not build up quickly enough, the ignition can be switched off to reset the unit,
and then on again to begin another 15 second period. Other times are available, contact ISSPRO for standard options.
Begin Installation:
Mount the control box in a protected area away from heat sources, water or splash areas. On trucks, the preferred area is
in the cab under the dash. The control unit does not have to be grounded. It should be securely fastened using the
mounting tabs provided on the control unit.
Low Water Level Probe Installation:
1. TOP TANK RADIATORS: Locate a point on the side of the tank away from the hose connections, but near the
center of the tank, and ¾” above the core. (Fig. 1A) (The probe may also be mounted at the centered top of the tank,
providing the bottom of the probe reaches sufficiently into the water. Be sure that the probe does not touch the top of
the core, when fully inserted.) (See Fig. 1B)