ZENNER MULTIDATA WR3 - Manual (Page 7)

7
Installation heat calculator
ZENNER recommends to mount the calculator
on the wall. Do not mount the device at the pipe
or attach it directly on the flow sensor.
The mounting adapter at the backside of the cal-
culator can be used for rail mounting or for wall
mounting.
For wall mounting detach the adapter and turn it
180°, attach with at least two screws to the wall
and clip the calculator on it.
For rail mounting lift the adapter a little bit, place
the calculator on the rail and push the adapter
back until it locks.
Connection sensors
The mounting of the temperature sensors should
be done symmetrical with direct immersion.
If immersion sleeves are used they have to be
checked for conformity to MID and have to be
marked accordingly.
The installation of immersion sleeves has to be
done according to DIN EN 1434-2.
■
The sensor cables are marked with colors (red
= supply, blue = return).
■
Do not buckle, extend or shorten the wires!
■
Do only use paired sensors with the same se-
rial number on it.
■
At 2-wire systems the cable length of the tem-
perature sensor for supply and return should
not exceed 2.5 m for PT100, 12.5 m for PT500
and 20.0 m for PT1000.
■
At 4-wire systems the maximum cable length
is 20 m.
■
Consider EN 1434-2 regarding the diameter of
the wires.
■
Supply and return sensors must be inserted
into the immersion sleeves completely.
■
Installation points in the flow sensor can be
used for symmetrical installation of the tem-
perature sensors.
■
Seal temperature sensor after installation to
prevent unauthorized demounting (seals in-
cluded).
■
Do not wrap or install wires along hot pipes.
Switch 2-/4-wire
Calculators equipped with 4-wire measuring sys-
tem can be switched to 2-wire with the switch on
the top left side of the connection board.
Switch to the left for 2-wire, switch position on the
right for 4-wire measurement.
Connection flow sensor
The total length of the wire between flow sensor
and calculator should not exceed 10 m.
With mechanical flow sensors the connection
order is optional. Mind the polarity at electronic
flow sensors.
Rail mounting Wall mounting