Electrical
(continued)
9
avoid over-ozonation.
The ozone generator 4-20mA control leads of the HDO3 system have been pre-wired at the
factory to the dissolved ozone monitor/controller. The negative (-) input signal to the Purple wire of the ozone
generator and the positive (+) input signal to the Orange wire of the ozone generator.
Note: The dissolved ozone
monitor/controller has been pre-programmed at the factory to 20mA or 100% ozone output. Either re-
programming the dissolved ozone monitor/controller or removing the 3-position 4-20mA control connector
from the HDO3 ozone generator can override this function.
Step 4:
Dissolved Ozone Monitor/Controller –
The HDO3 series systems are equipped with an integral dissolved
ozone monitor/controller. This monitor/controller is equipped with alarm relays that can be used to interlock
other devices based on dissolved ozone levels. Main power and the 4-20mA control interface to the ozone
generator have been pre-wired at the factory. The unit has also been pre-programmed at the factory to supply a
constant 20mA (100%) ozone output signal to the ozone generator. The dissolved ozone monitor/controller
must be re-programmed for any other desired setting. See the dissolved ozone monitor/controller manual for
function and electrical hook-ups.
External Loop Electrical Interface
Figure 5-1
120 VAC Signal
L1
Power from ORP, PPM,
pump or timer
N
120V
Coil
Interface Relay
External Loop
240 VAC Signal
L1
Power from ORP, PPM,
pump or timer
L2
240V
Coil
Interface Relay
External Loop
