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9 8 Water meter installation
For information on the water meter installation, please
refer to the manufactures manual. Pay attention to the
installation position, flow direction and the calming section.
Basic rule: The water meter should have 10 nominal diam-
eters of straight pipe ahead of the meter and 5 nominal
straight pipe diameters after to ensure proper flow through
the meter.
Figure 31: Water meter installation
D
10×D
BERNT LORENTZ GmbH & Co. KG Kroegerskoppel 7, 24558 Henstedt-Ulzburg, Germany, Tel. +49 (0) 4193 7548 - 0, Fax - 29, www.lorentz.de
All specifi cations and information are given with good intent, errors are possible and products may be subject to change without notice. Pictures may
differ from actual products depending on local market requirements and regulations.
9 9 Automatic control for full-tank shutoff
We recommend the use of a float switch or other means
to prevent overflow of your tank. This will stop the pump
when the tank is full, then reset when the level drops. This
conserves ground water, prevents overflow, and eliminates
unnecessary pump wear. PSk controllers allow the use of
small diameter signal cable to a remote float switch, even if
the tank is a long distance away.
Float switch requirements:
(1) A switch must be used, not wet electrodes.
(2) The preferred system requires a float switch to OPEN
contact on rise to turn the pump OFF. This is called
"normally closed" (N.C.).
Float switch cable requirements:
(3) Two wires are needed.
(4) Minimum wire size 1 mm² [AWG 18]. This is good for a
distance as far as 600 m [2,000'].
(5) The cable must be suitable for its environment.
(6) If it must run a long distance, use twisted-pair shielded
cable to reduce the chance of damage from lightning-
induced surges.
Figure 32: Float switch scheme
sealed
cable clamp
cable
weight
5×D
Grounding shielded float switch cable – If you
use shielded cable, connect the shield to ground AT THE
CONTROLLER ONLY. DO NOT ground the shield at the float
switch. This will reduce surges induced by nearby lightning.
Operation of the float switch system – When the
water level is high, the float switch will stop the pump.
The TANK-FULL indicator on the controller will light up.
When the water level drops, the float switch will signal the
controller. The indicator light will go out, and the pump will
restart if sufficient power is available.
Wiring to the controller – The float switch must be
connected to the controller via plug at slot B7, cf. chapter
"8.4.4 Cable entries and external sockets" on page 14.
Manual remote control switch – The float switch circuit
can be used with a manual switch to turn the pump on and
off from a distance. Use any simple on/off switch available
from an electronic supply, electrical supply, or hardware
store (it only carries low voltage, very low current).
position pump off
pumping
range
position pump on
27
Sun. Water.
Life.
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