2 AB-6650
Safety Instructions
Please read instructions carefully and use the product as specified in this manual. Be sure to keep this manual near by
for ready reference.
Usage Restrictions
This product is targeted for general air conditioning. Do not use this product in a situation where human life may be
affected. If this product is used in a clean room or a place where reliability or control accuracy is particularly required,
please contact Azbil Corporation’s sales representative. Azbil Corporation will not bear any responsibility for the results
produced by the operators.
WARNING
• DANGER: To prevent the risk of severe or fatal electrical shock, always disconnect power source from the
controller power supply terminals before performing any wiring.
• Before replacing the controller (main unit), disconnect the power supply of the valve and other equipment
connected to the controller. Electrical shock may result.
• Before replacing the 4-electrode sensor, be sure to turn off the controller. Electrical shock may result.
• Do not disassemble the product. Electrical shock and equipment damage may result.
• Make sure all the wires are tightly connected. Fire and smoke due to heat generation of the equipment,
electrical shock, and equipment damage may result.
• Be sure to ground. Improper grounding may cause electrical shock and equipment damage.
• Do not detach the terminal cover except when connecting or disconnecting the wires. Be sure to reattach the
terminal cover after connecting or disconnecting the wires. Before detaching and attaching the terminal
cover, make sure all the wires and terminals are disconnected from the power source.
CAUTION (1/2)
• Installation must be performed by qualified personnel in accordance with all applicable safety standards.
• Installation must be carried out according to the operating conditions specified in this manual to prevent
equipment damages.
• All wiring must comply with local codes of indoor wiring and electric installation rules.
• Use crimp terminals with insulation for electric wires.
• Wire stripping length to be connected to the quick-fit screwless (clamp) terminal block must be 10 mm. If the
wire is stripped longer than 10 mm, the conductor will be exposed causing electrical shock and short-circuit
between adjacent terminals. If shorter, the conductor may not contact the terminal.
• If more than the rated power supply voltage is applied to the controller, controller replacement is required for
safety.
• Do not peel off the label with symbol.
• Lightning protection is required based on regional characteristics and building structure in order to minimize
lightning damage.
• After completing the wiring, be sure to peel off the protective sheet.
• Install the controller under the cooling tower, on a wall under an eave, and other locations unexposed to direct
sunlight and rain.
• For the controller installation, avoid weathered locations, and install the controller inside the rain-proof case if
necessary.
• When temperature control output is set to N.C. for anti-freeze electric heater, temperature control does not
interlock with the electric heater operation. Provide an additional circuit to prevent the heater from heating
when no water is left.
• Install the 4-electrode sensor inside the water tank or in a location (close to the tank) where water flows well.
• For the 4-elecrode sensor installation, do not allow the 4-elctrode sensor to directly contact the inner wall or
bottom of the water tank. Leave approx. 10 cm away from the inner wall and from the bottom.
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