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240VAC ELECTRICAL CONNECTIONS WITH OPTIONAL ELECTRICAL INTERLOCK BOX
Follow the instructions below and the wiring diagram on the previous page to wire your system. Note: All electrical
connections should be made by a qualied electrical contractor. All local, state and national codes must be observed.
Inside the electrical interlock box (at the bottom, toward the center) is a terminal strip. All the peripheral equipment is
wired to this block (with the exception of the air dryer, which should be wired separately for continuous operation). All
possible pre-wiring to the terminal block has been done.
A dedicated 20 AMP circuit should be run from the main electrical panel to the electrical interlock box or from the main
electrical panel into a service disconnect box before wiring to the interlock box.
Terminals 1 & 2: Main Power - 240 VAC, 60 Hz, 2 Amps w/o booster pump, 11 AMP with 1 HP booster pump. Use
minimum #12 AWG. Connect 240 VAC, 20 AMP from the disconnect box or from a dedicated breaker on the main
panel to the 240 VAC terminals 1 (L1) & 2 (L2). Connect the green ground wire to the grounding bar.
Terminal 3: System Neutral - Use minimum #12 AWG. Provide a true neutral lead for this position. A true neutral
runs from this terminal to the neutral bus bar in the main breaker panel. Do not ground this terminal or jumper to the
ground. Note: The unit will not function without true neutral to this location.
Terminal 4: MCI (Motor Control Interlock) - 120 VAC, 60 Hz. Use # 18 AWG. This is an interlock from the main pump
to the ozone system. Run a 120 VAC line from the motor starter relay to this terminal. Should this feature not be
used, simply install a jumper from L1 to this terminal. Note: The unit will not function without a 120 VAC signal to this
location.
Terminals 5 & 6: Oxidation Reduction Potential (ORP) Controller - 120 VAC, 60Hz. Use #18 AWG. This is control
voltage only (120 VAC) from the controller to a relay integrated into the ozone system. These terminals may also be
used to operate the system using a 120V signal from a ow switch or timer. Note:
To override the ORP control signal,
simply turn the ozone switch on the electrical interlock box to the ON position.
Terminals 7 & 8: Booster Pump - 240 VAC, 60 Hz, 8 AMP, 1 HP. Use minimum #14 AWG. Wire from the terminal
strip to the booster pump as indicated. The booster pump will be controlled by the interlock box. If you are using a
pump of over 1 HP, you will need to use a magnetic starter relay with these terminals providing the control voltage to
the magnetic starter relay. In many cases this feature is not be used; the operation of the remaining equipment will
not be affected.
Terminals 9 & 10: Ozone Generator - 240 VAC, 60 Hz, 2 AMP. Hard wire the ozone generator to the terminal strip as
indicated. The ozone generator will be controlled by the electrical interlock box.
Air Dryer: 120 VAC, 60 Hz, 1 AMP. Plug the air dryer into a standard wall outlet 120 VAC, 60 Hz. The air dryer should
remain energized at all times with the exception of long term shutdown for service. The air dryer can be hard wired to
the electrical interlock box utilizing terminals 1 (120V) and 3 (neutral) or can be plugged directly into the convenience
outlet on the bottom of the electrical interlock box if terminals 1 & 2 are NOT timer controlled. If possible, the air dryer
should be plugged in 24 hours prior to system startup in order to pre-dry the desiccant beds.
Using a bonding wire conforming with all local, state and national electrical codes (normally a #8 AWG), ground the compo-
nents to the grounding bar on the electrical interlock box and bond the electrical interlock box to a true earth ground.
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