Specifications

4
HECD–65 & HECD–130 Installation & Operations Manual
Low Pressure Limit Switch:2. This switch is
located in the oxygen sensor enclosure located
on the upper rear interior wall and connected
to oxygen supply tubing. If pressure in the
oxygen feed gas line drops below 2 psig the
switch opens initiating a system shutdown and
displaying a fault message on the interface
panel.
Vacuum Switch:3. The switches are located on
the flow panel and connected to the gage port
on the Vacuum Regulator. If the vacuum in the
ozone supply line falls below 1 psig (2 in.Hg)
or above 3.4 psig (7 in.Hg) the switch will open
initiating a system shutdown and displaying a
fault message on the interface panel.
NOTE: The injection point (venturi) that
receives ozone from the generator must be
drawing at least 15% greater flow (scfh) than
the feed gas rate of the ozone generator.
A slight vacuum will be developed in the
ozone generator due to this flow differential.
Transformer Temperature Limit Switch:4.
This limit switch is located on the high voltage
transformer(s). If the case temperature of the
transformer rises above 150°F (66°C) the
switch will open initiating system shut-down
and displaying a fault message on the interface
panel.
Coolant Temperature Limit Switch:5. This limit
switch(s) is located on the water jacket(s) of
the ozone module(s). If coolant temperature
rises above the 110°F (43°C) setpoint of the
switch it opens initiating system shutdown and
displaying a fault message on the interface
panel.
Door Interlock Switch:6. Attached on the
right side of the enclosure door opening, this
switch will shut down the H.V. power circuit
immediately, if the door is opened, and initiate a
system shut-down. A fault message is displayed
on the interface panel.
External Interlock:7. This circuitry functions as
other safety interlock switches but is designed
for field wiring to external control devices.
Terminals for field wiring are located on the
DIN rail next to the input power circuit breaker.
Circuit requires a dry contact to switch 24 VDC
@10mA as supplied by the Generator’s internal
supply. See instructions 4-0950-01 for details.
Coolant Flow Sensor:8. This device is located
on the flow panel and supplies the PLC with a
pulse output proportional in frequency to the
coolant flow rate. If coolant flow drops below .5
GPM the PLC initiates system shutdown and
displays a fault message on the interface panel.
Oxygen Concentration Sensor:9. This device
is located in the oxygen stream inside the
oxygen sensor enclosure and supplies the PLC
with an analog signal proportional to oxygen
concentration rate. If oxygen concentration falls
below 80% the PLC initiates system shutdown
and displays a fault message on the interface
panel.
Ambient Air Temperature Limit Switch:10.
This limit switch is located on the lower right
hand corner of the enclosure. If the ambient
air temperature rises above 100°F (37°C) the
switch will open initiating system shutdown and
displaying a fault message on the interface
panel.
3C. High Voltage Power Supply
CAUTION: LETHAL VOLTAGES ARE PRESENT.
NEVER BYPASS SAFETY INTERLOCKS.
Power Inverter:1. This device is mounted
within the control unit and supplies a regulated
frequency (factory set) controlled AC Pulse
Train to the primary windings of the High
Voltage Transformer(s). Power delivered to the
HV circuit is modulated by the PLC with input
from the OIP (This input is designed as Ozone
Power Level).
High Voltage Transformer(s):2. Steps voltage
supplied by the inverter up to the necessary
level for ozone production. Primary connections
are located against side wall of the enclosure.
High Voltage terminal (secondary) is located
facing into the main enclosure.
High Voltage Cable(s):3. Delivers the output
of the H.V. transformer to the module H.V.
housing. The cable assemblies are fitted spark
plug style terminals to mate with terminals on
the transformer and H.V. housing insulator plate
on the module.
3D. Corona Discharge (CD) Modules
CD Water Jacket:1. The water jacket consists of
a stainless steel outer tube and 7 small inner
tubes (ground tubes) with a plate on each
end sealing the heat exchanger and providing
connection points for air, ozone and cooling
water. Gaskets provide a seal on each end to
the high voltage housing on top and the end
cap on bottom.
High Voltage Cold Cathode Electrodes:2.
Each generator module contains 7 gas filled
electrodes.
High Voltage Housing:3. Consists of a
specialized ceramic head bonded to a glass