Operation &
Maintenance Manual
Pump
RW-R
20/28
Edition 1
HSC
02-W51
782-007-GB
Water present:
-
low resistance between terminals 1 and 7
(300-500 Ohm)
-
terminals 2 and 4 open
-
terminals 3 and 4 closed
9.2 Thermoswitches
When your pump is equipped with thermoswitches,
a “T” is stamped at position 24 on the dataplate.
(see appendix 1). A copy of your dataplate is on page 2.
For connection values see par. 5.4.
9.3 Thermistors
In stead of thermoswitches, the pump can be equipped
with thermistors (on special request).
This will be marked with a “U” on the dataplate at
position 24 .
Normally the resistance is about 200-500 Ohm.
When the switch-off temperature is reached the resist-
ance will be between 1650-4000 Ohm.
The maximum voltage is 7.5V.
A thermistor is not a circuit breaker but a
resistance.
9.4
Cable protection
When chemical or mechanical protection for the
cable is needed a tube can be fitted around the
cable (Fig. 9.2 pos 1).
This is a flexible stainless steel tube (1) connected to a
special cable entry (Fig.9.2 pos 2).
When your pump is equipped with a cable protection, a
“3” is stamped on the dataplate at position 24. See
appendix 1
9.5
Special oil
Upon request the oil housing can be filled with
a special oil. If so, a label on the pump shows which
kind of oil is used.
Fig. 9.2
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