Lorentz PS200 Instructions For Installation Operation Service page 26

Automatic Control For Full-Tank Shutoff continued
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 indica-
tor 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
override 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.
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 control-
ler, 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 5.12.
26
CAUTIONS for the wireless alternative
1. The pump system must be capable of
producing at least 25 PSI (60 feet, 18m)
more than the full lift pressure. (A conven-
tional 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 vertical feet (30m), 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 perform-
ance.
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 undesir-
able. Any captive-air pressure tank of 2
gallons (8 ltr) 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 pressure tank
to the atmosphere and let out all the pre-
charge air. (The air bladder must not collapse
all the way.)
7. WARNING Install an appropriate pressure
relief valve for safety (see Section 5.12).
8. Be sure the tank has a safe way to overflow
if the float valve leaks, wire breaks, etc.
9. 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".
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 12
volts, very low current). Wire it according to
the illustration above, for a normally closed
float switch.