8 - ATR121 - User manual
Loose screws may occasionally result in fire.
For screw terminals of relays and of power
supply, tighten screws to tightening torque of
0,5 Nm.
Warning!
A malfunction in the Digital Controller
may occasionally make control operations
impossible or prevent alarm outputs, resulting
in property damage. To maintain safety in the
event of malfunction of the Digital Controller,
take appropriate safety measures, such as
installing a monitoring device on a separate line.
Warning!
1.3
Precautions for safe use
Be sure to observe the following precautions to prevent
operation failure, malfunction, or adverse affects on the
performance and functions of the product. Not doing so may
occasionally result in unexpected events. Do not handle the
Digital Controller in ways that exceed the ratings.
• The product is designed for indoor use only. Do not use
or store the product outdoors or in any of the following
places.
- Places directly subject to heat radiated from heating
equipment.
- Places subject to splashing liquid or oil atmosphere.
- Places subject to direct sunlight.
- Places subject to dust or corrosive gas (in particular,
sulfide gas and ammonia gas).
- Places subject to intense temperature change.
- Places subject to icing and condensation.
- Places subject to vibration and large shocks.
• Installing two or more controllers in close proximity
might lead to increased internal temperature and this
might shorten the life cycle of electronic components. It
is strongly recommended to install cooling fans or other
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