
AB-7177 
2 
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. 
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 our 
sales representative. Azbil Corporation will not bear any responsibility for the results produced by the operators. 
 
Warnings and Cautions 
WARNING Alerts users that improper handling may cause death or serious injury. 
CAUTION Alerts users that improper handling may cause minor injury or material loss. 
 
Signs 
Alerts users possible hazardous conditions caused by erroneous operation or erroneous use. The symbol inside 
indicates the specific type of danger. 
(For example, the sign on the left warns of the risk of electric shock.) 
Notifies users that specific actions are prohibited to prevent possible danger. The symbol inside graphically 
indicates the prohibited action. 
(For example, the sign on the left notifies that disassembly is prohibited.) 
Instructs users to carry out a specific obligatory action to prevent possible danger. The symbol inside graphically 
indicates the actual action to be carried out. 
(For example, the sign on the left indicates general instructions.) 
 
WARNING 
Before wiring and maintenance, be sure to turn off the power to the product. 
Failure to do so might cause electric shock. 
To control a VAV unit with electric heater, be sure to provide a circuit to prevent temperature rise. 
Failure to do so might cause fire or overheating. 
To control a VAV unit with electric heater, configure the system so that air conditioning unit will not stop when the VAV 
unit is turned off. This allows the electric heater to cool down after it is turned off. 
Failure to do so might cause fire or device damage. 
 
 CAUTION (1/2)
Installation and wiring must be performed by qualified personnel in accordance with all applicable safety standards.
Install and use the product in a location that meets the operating conditions (temperature, humidity, power, vibration, 
shock, mounting direction, atmospheric condition, etc.) as listed in the specifications. 
Failure to do so might cause fire or device failure. 
All wiring must comply with applicable codes and ordinances. 
Make sure all the wires are tightly connected to the corresponding terminals. 
Failure to do so might cause device failure or overheating. 
For wiring, strip each wire insulation as specified in this manual. If the strip length is longer than the specified, the 
stripped part of the wires will be exposed, causing electric shock or short circuit between adjacent terminals. If it is 
shorter, the stripped part will not contact the connector. 
If more than the rated power voltage is applied to the product, replace the product with new one for your safety. 
Failure to do so might cause device failure or overheating. 
Be sure to provide a circuit breaker for the power to the product as the product does not have a power switch. 
Do not test the withstand voltage of the product. 
Doing so might cause accident or device failure.