Specifications

3
HECD–65 & HECD–130 Installation & Operations Manual
3B. System Interlocks & Sensors
Water Back-flow Detection Unit:1. Unit is
plumbed into the ozone outlet line. Any water
reaching this point is trapped and collected.
When water is detected in the unit the PLC is
signaled causing an immediate shutdown of the
high voltage circuitry and the output solenoid
valve. A fault message is displayed on the
interface panel. The air preparation system
remains running for an additional 30 seconds
to overcome any trapped vacuum. The fault
condition remains until the operator has drained
water from the ozone plumbing. After ensuring
that all water has been removed from the unit
the fault can be cleared and the system may be
restarted normally.
NOTE: Water back-flow protection/fault
conditions occur when water back-flow
prevention devices have failed. Prior to re-
starting the generator, any solenoid valves,
check valves or other protective devices
must be replaced or serviced.
NOTE: The ozone gas supply line must
have a back flow prevention device (such
as a check valve) installed between the
ozone generator and the point of injection
to prevent water from backing up into the
generator system.
Electrical Connection: Connect input power 5.
and ground to the main circuit breaker and
din rail terminal located on the inside of the
field connection panel (See Figure 1). Power
requirements for each generator are listed in
the specifications label on the inside of the
cabinet door.
Final Inspection: Before starting up the ozone 6.
generator system check that all mechanical
connections are leak proof and that electrical
connections are shielded and well insulated.
Visually inspect the inside of the generator
cabinet for loose wires or connections. Remove
all debris from enclosure interior and around
installation.
SECTION 3 System Overview
3A. Control System Components
Operator Interface Panel (OIP):1. Located
in the upper right-hand exterior surface of
the enclosure. This 4 line LCD display with
function buttons (as described below) provides
operational data as well as system control.
Indicator LED’s along with test messages
inform the operator of functional conditions of
the unit.
Programmable Logic Controller (PLC):2.
Mounted within the control unit. The controller
and operating software have been designed
to control and report all generator functions.
Safety interlocks ensure proper activation/shut-
down sequences of system functions and are
reported through the OIP. Analog IO is analyzed
and also reported through the OIP. External
interlocks are tied into the controller as well.
DC Power supply:3. Mounted within the Control
Unit. Supplies 24 VDC power to control system
components. All relay coils, solenoids, sensors
and safety interlocks are powered from this DC
source.
Power Relays:4. Two relays mounted
within the control unit provide 240 Vac to
the air compressors, blower and oxygen
concentrator(s). These are controlled by the
PLC and provide a green LED indicator when
activated.
Figure 2: Injector Assembly
Figure 1: Generator Connectors
Breaker
Remote Stop
4-20 mA
Remote Pause
External Control
Wires Strain Relief