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BERNT LORENTZ GmbH & Co. KG Kroegerskoppel 7, 24558 Henstedt-Ulzburg, Germany, Tel. +49 (0) 4193 7548 - 0, Fax - 29, www.lorentz.de
Errors excepted and possible alterations without prior notice.
If you are not using a float switch, terminals 4
and 5 must be connected. Terminal 3 remains
disconnected.
Operation of the float switch system When the
water level is high, the float switch will stop the pump.
The FULL-TANK OFF 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.
Overriding the float switch You may want to over-
ride the float switch to allow overflow for irrigation
purposes or to test or observe your system. For a N.O.
switch circuit, install a switch to DISCONNECT ONE of
the float switch wires. FOR A N.C. switch circuit, install a
switch to CONNECT the two float switch wires together.
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, electri-
cal supply, or hardware store (it only carries 12 V, very
low current). Wire it according to the illustration above,
for a normally closed float switch.
WIRELESS ALTERNATIVE, using a float valve and
pressure switch It may be feasible to use a FLOAT VALVE
in the water tank (instead of a float switch) for remote
shutoff. This eliminates the need for a cable to the tank
when the tank is a long distance from the pump system.
When the tank fills, the valve shuts, causing pressure to
rise at the pump. A pressure switch is installed at the
wellhead (or at anywhere along the pipe). The pressure
switch is wired to the pump controller, and adjusted to
respond to the rise and fall of pressure. The assembly is
similar to that of a normal pressurizing system. Refer to
section 4.13
CAUTIONS
for the wireless alternative
1. The pump system must be capable of
producing at least 25 PSI (60 ft, 18 m) more
than the full lift pressure. (A conventional
pressure switch may not function reliably
at a lower pressure differential.)
2. If the lift from the pressure switch up to
the tank is to exceed 100 ft vertical (30 m),
the off-pressure may exceed the pressure
ratings for normal components, which is
typically 150 PSI (10 bar).
3. Pressure switch adjustments are critical.
Be sure to observe carefully to verify the
performance.
4. Install a pressure gauge near the pressure
switch, to help you make adjustments.
5. Install a small pressure tank near the
pressure switch. Without it, rapid start/
stop cycling is likely to occur which is very
undesirable. Any captive-air pressure tank
of 2 US-Gal. (8 l) or larger is sufficient.
6. Adjust the pressure tank pre-charge to a
pressure slightly lower than the working
pressure in the pipe. On level ground, the
working pressure may be nearly zero. In
that case, open the water-end of the pres-
sure tank to the atmosphere and let out all
the precharge air. The air bladder must not
collapse all the way.
7. Be sure the tank has a safe way to over-
flow if the float valve leaks, wire breaks,
etc.
8. To prevent slow action of the float valve,
and lots of on/off cycling, we recommend a
quick-acting float valve. Source: Tek Supply,
www.teksupply.com (800) 835-7877, Item
#WR-1300, or search “Hudson Valve”.
WARNING Install an appropriate
pressure relief valve for safety, see
section 4.13
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