9
INSTALLATION PROCEDURES –
Electrical
CHAPTER 5
The SC27P ozone generation system is designed to
hard wire to the main power source with specific input
voltage requirements. All possible pre-wiring has been
completed at the factory. Logic Schematics have been
provided in the Appendix-Section C.
• 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 ozone generator to a true earth ground.
Use solid copper bonding wire (usually #8 AWG) from the copper-bonding lug located on the bottom of the
ozone generator to the grounding point.
Step 2:
Main Power:
Wire main power to the Electrical Hook-up Box located on
the left side of the SC27P with specified input voltage, either 120VAC
60Hz (L1-Black and Neutral-White) or 220VAC 50Hz (L1-Red and
L2/Neutral-Black), single phase (1
ø
). Using #12 AWG, wire L1 main
power to terminal #1. Using #12 AWG, wire a system neutral to terminal #4. Using #12 AWG, wire a system
ground to terminal #6. See Figure 5-1 for Electrical Hook-up Box Terminal Strip Diagram. See Appendix-
Section A for Electrical Terminal Strip location.
Step 3:
MCI (Motor Control Interlock) Power:
The MCI is a fused factory-wired interlock, which may be used to
energize or de-energize the SC27P with other electrical component(s) via an input signal. If the MCI is used,
remove the factory-wired jumper between L1, terminal #1 and the MCI, terminal #2, of the Electrical Hook-up
Box Terminal Strip. Using #18 AWG, wire a 120VAC power signal (1 amp max) for a 120VAC 60Hz system
or a 220VAC power signal (1amp max) for a 220VAC 50Hz system to the top of the MCI, terminal #2. If so
required, a MCI Neutral may also be wired, using a #18 AWG wire to terminal #5. See Figure 5-1 for
Electrical Hook-up Box Terminal Strip Diagram. See Appendix-Section A for Electrical Terminal Strip
location.
Note: The SC27P will not function without an input signal to the MCI, terminal #2.
Step 4:
External Contactor Signal:
The SC27P is equipped with an external contactor output signal. The output
voltage will be 120VAC (2 amp max) for a 120VAC 60Hz system or 220VAC (2 amp max) for a 220VAC
50Hz system. Using a #18 AWG, wire from the External Contactor, terminal #3 of the Electrical Hook-up Box
Terminal Strip, to the coil side of a contactor. If so required, an External Contactor Neutral may also be wired,
using a #18 AWG wire from the Auxiliary Neutral, terminal #5 to the coil side of the contactor. See Figure 5-1
for Electrical Hook-up Box Terminal Strip Diagram. See Appendix-Section A for Electrical Terminal Strip
location.
Step 5:
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 accept 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
“External Loop” LED and turn off the “Ozone Output” LED(s) located on the control panel of the system (see
Appendix-Section A)
.
Note: When the external loop has lost continuity main power to the ozone
generator will remain “ON” giving power to the rest of the systems components.
When continuity is
present through the external loop, ozone output will continue. This continuity will effectively turn “OFF” the
“External Loop” LED and will again illuminate the “Ozone Output” LED(s).
The external loop is located on the left side of the system, positions #9 and #10 on the terminal block (see
Appendix - Section A), and can be interfaced to any control device, i.e., pressure switch, vacuum switch, flow
switch, float switch, ORP controller, PPM controller, or timer. 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 5-2, “External Loop Electrical Interface”).
Step 6:
Ozone Output Control:
The SC27P ozone generator is equipped with two options for controlling the ozone
output. The first option is a Manual 0-100% Ozone Output Control and the second is a Remote 4-20mA
Control signal. See Appendix-Section A for the location of the manual ozone output control knob and remote
4-20mA control leads (orange and purple). An LED located on the systems control panel indicates the ozone
Power Consumption
Input
Voltage
120VAC
60Hz
220VAC
50Hz
SC27P
9 amps
4.5 amps
