© Munters AB, 2020 8
2
Precautions
CAUTION
Protection provided by the equipment can be impaired if the equipment is used
in a manner not specified by the manufacturer!
CAUTION
There is a risk of explosion if the lithium battery is replaced with an incorrect
type. Replace the battery using the same type and manufacturer only.
•
Grounding
•
Filtering
•
Checking the Battery Level
•
Frequency Inverters
2.1
Grounding
•
Always connect temperature and sensor shields to earth ground.
Avoid mixing
high voltage wiring with sensor and low voltage wiring
.
•
Keep the controller as far as possible from heavy contactor boxes and other
sources of electrical interference
.
•
Do not connect communication wire shields, which go from one house to another
at both ends. Connect them at one end only. Connection at both ends can cause
ground loop currents to flow, which reduce reliability
.
•
The COM connection for communications is not the shield wire. The COM, RX and
TX wires must connect to each other at all controllers
.
2.2
Filtering
If this installation includes a power inverter to drive variable speed fans, install an EMI filter
in front of the inverter, according to the specifications provided by the inverter
manufacturer. Refer to the inverter documentation.
2.3
Checking the Battery Level
Check the battery once a year. The output must be 2.7 volts (minimum). Authorized
personnel only must replace the battery if the output is below the minimum required level
or every five years.
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