8
INSTALLATION PROCEDURES –
Electrical
CHAPTER 5
The HDO3 Series ozone generation systems are designed to be hard wired to the main power source with the specific
input voltage requirements. All possible pre-wiring has been completed at the factory. Logic schematics have been
provided in the Appendix - Section D.
NOTES:
• All electrical connections should be made by a
licensed, qualified electrician. All local, state and
national codes must be observed.
• Make sure all power is off at the main circuit
breaker before making any electrical connections.
Step 1:
Conforming to all local, state and national electrical codes, ground the HDO3 system to a true earth ground.
Use solid copper bonding wire (usually #8 AWG) from the copper-bonding lug located on the base of the
HDO3 system.
Step 2:
Main Power –
The systems are equipped with a
12AWG 2-pole/3-wire cord 10 foot in length. Wire the
HDO3 system from the main power cord to the main
power source with specified input voltage, either
120VAC 60Hz (L1-Black, Neutral-White and Ground-
Green), 220VAC 50Hz or 220VAC 60Hz (L1-Black,
Neutral/L2-White and Ground-Green), single phase
(1
ø
), +/- 10% of rated voltage.
Step 3:
External Loop:
The external loop is a true dry contact interface.
Note: The term ‘dry contact’ means that
this loop does not supply output nor except input voltages. Warning: Supplying voltage to the external
loop will cause damage to the ozone generator and void warranty.
Under normal operation, the external
loop will effectively interrupt the ozone output when the loop has lost continuity; this will also illuminate the
LED located on the 4-20mA control board inside the HDO3-II and HDO3-III ozone generators and the EXT
LOOP LED on the front cover of the HDO3-I ozone generator (see Appendix-Section A, for location of 4-
20mA board) and turn off the “Ozone Output” LED(s) on the front cover.
Note: When the external loop has
lost continuity main power to the ozone generator will remain “ON” giving power to the cooling fan(s).
When continuity is present through the external loop, ozone output will continue. This continuity will
effectively turn “OFF” the LED of the 4-20mA board and the EXT LOOP LED and will again illuminate the
“Ozone Output” LED(s).
The external loop, a removable two-position plug with a white 18AWG wire located at the bottom panel of the
ozone generator (see Appendix-Section A), can be interfaced to any control device, i.e., pressure switch,
vacuum switch, flow switch, float switch, ORP controller, PPM controller, or timer. To interface a control
device to the external loop, cut the white 18AWG wire in half. Connect the control device to each leg of the
external loop.
Note: External Loop control devices supplied by ClearWater Tech may come equipped
with a two-position male connector ready to be plugged into the female two-position connector mounted
to the chassis of the ozone generator.
If the control device used supplies an output voltage, a single pole
single throw (SPST) normally-open relay may be used to create a dry contact interface (see Figure 5-1,
“External Loop Electrical Interface”).
Note:
Attached to the white 18AWG external loop is a warning,
“THIS CONNECTION IS A DRY CONTACT ONLY, DO NOT APPLY VOLTAGE”.
Step 3:
Ozone Output Control –
The HDO3 Series systems are equipped with two options for controlling the ozone
output, either a manual 0-100% ozone output control or a remote 4-20mA control input signal. See Appendix-
Section A for location.
1.
Manual Ozone Output Control -
Turning the control knob counterclockwise will decrease the ozone output down
to 0%, while turning the knob clockwise will increase the ozone output up to 100%. The “Ozone Output” is indicated
by the LED(s) on the front of the ozone generator, see Appendix-Section A.
2.
Remote 4-20mA Control:
The ozone generator will automatically sense the 4-20mA input signal and override the
setting of the manual ozone output control. Based on the 4-20mA signal, ozone output will increase or decrease,
4mA = 0% ozone output, 20mA = 100% ozone output. The “Ozone Output” is indicated by the LED(s) on the front
of the ozone generator, see Appendix-Section A.
Note: If the remote 4-20mA signal fails or is missing, the system
will default to the manual ozone output setting. Check and adjust the manual ozone output control knob to
HDO3 Series Power Consumption
Input
Voltage
120VAC
60Hz
220VAC
50Hz
240VAC
60Hz
HDO3–I
20 amps
11 amps
10 amps
HDO3– II
20 amps
11 amps
10 amps
HDO3–III
20 amps
11 amps
10 amps
