RainWater Harvesting RWH-FL01 User manual

RWH-FL01 Float Switch www.RainWaterHarvesting.co.uk ©2010 1
FLOAT SWITCH
Product ID: RWH-FL01
INSTALLATION INSTRUCTIONS
The float switch can be wired either to turn a pump off or to turn a pump on. Identify
your application first, before proceeding to connecting the wiring. Correct connection of a
float switch does require electrical knowledge and expertise.
E) SECURING AND ADJUSTING THE FLOAT SWITCH
The float switch must be mounted in the tank or water source so that it can rise or fall
with the water level and turns off or on at the correct level. Before fitting, tip the float
switch up and down, listening to the gravity switch moving inside the body, in order to
satisfy yourself of the angle at which the switch moves. Secure the cable some distance
from the float switch by one of two methods:
i) If a bulkhead or downpipe is available in the water source, secure the float switch
cable to it with a nylon tie wrap or similar. Only drill a hole in the bulkhead or downpipe
for the tie wrap if drilling does not compromise the water tightness of the tank.
The diagrams show this mounting
method, with float switch cable
attached to a 4 inch downpipe in
a storage tank by nylon cable tie
or similar. On the left, float switch
is free to float in the presence of
water and has turned a pump ON
or OFF depending on wiring. On
the right, float switch can flip to
the other electrical position (OFF
or ON) as the water level drops to “empty”
ii) If no such solid mount is available, the cylindrical counter weight (supplied with
the float switch) can be used as an anchor, below which the float switch cable flexes.
Peel the plastic ring off
the counterweight and
place the ring round the
float switch cable below
the weight. Thread the
cable through the weight
so it hangs on the ring.
Secure the cable in the
right position at the top of
the tank securely but making sure that the insulation of the cable will not rub and break
(risk of short circuit).
iii) In either mounting method i or ii, adjust a) the position of the tie wrap or
counterweight anchor and b) the length the cable after this point so that the float switch
turns the appliance on or off at the correct water levels.

RWH-FL01 Float Switch www.RainWaterHarvesting.co.uk ©2010 2
A) WIRING Pump turns OFF when float rises
This use of the float switch is
typically
i) keeping a header tank full
by pumping from a storage tank
ii) filling a storage tank, or
backing up its rainwater supply,
from a well, bore-hole, stream or
spring, or
iii) mains backup (in this case
the float switch can be used to
control a solenoid valve admitting
mains water to a rainwater storage
tank when rain runs out).
Wiring: if connecting a 230 Volts
AC pump to turn OFF when the
float rises, refer to the figure
(right) and proceed as follows:
a) identify the black lead from
the float switch and connect it to
the N (neutral) pin of the three pin mains plug,
b) identify the blue lead from the float switch and connect it via a waterproof
connector to the N (neutral) pin of the pump,
c) Identify the brown lead from the float switch, which will not be used, and ensure
it is well insulated in a dry place, and
d) Connect the L (live or lead) pin of the three pin mains plug to the L pin of the
pump. If the pump’s cable is not identified by N or L then the polarity is not important.
B) WIRING Pump turns ON when float rises
This use of the float switch is
typically
i)to prevent a tank from
overflowing
ii) to run a scavenge pump
when all water must be pumped
out, or
iii) to protect a pump from dry
running
Wiring: if connecting a 230 Volts
AC pump to turn ON when the float
rises, refer to the figure (right) and
proceed as follows:
a) identify the black lead from
the float switch and connect it to
the N (neutral) pin of the three pin
mains plug,
b) identify the brown lead
from the float switch and connect it
via a waterproof connector to the N (neutral) pin of the pump,
c) identify the blue lead from the float switch, which will not be used, and ensure it
is well insulated in a dry place, and
d) Connect the L (live or lead) pin of the three pin mains plug to the L pin of the
pump. If the pump’s cable is not identified by N or L then the polarity is not important.
L
N
230 Volts AC
Mains Plug
Pump
Float switch
Damp resistant
connector
Pump turns ON when float rises
Bluelead
insulated
E
LN
230 Volts AC
Mains Plug
Pump
Float switch
Damp resistant
connector
Pump turns OFF when float rises
Brown lead
insulated
E

RWH-FL01 Float Switch www.RainWaterHarvesting.co.uk ©2010 3
WIRING C) One pump turns OFF when float rises and another pump turns on
There are some specialist applications where the float switch can control two pumps. For
example, one pump could be permanently pumping from one tank, and when this first
tank is empty a second pump starts pumping from another source. Apply the detail of the
two basic functions A and B above.
WIRING D) General information and warnings applicable to all functions
i) The float switch cable can carry 230 Volts AC or other voltages at DC (direct
current)
ii) In the case of 230 Volts AC applications, ensure that there is no risk of the wire
fraying and insulation breaking down. Ensure that connections are secure, dry and well
insulated from short circuit and from contact with a maintenance person.
iii) Do not connect the earth pin of the mains plug to any lead of the float switch.
Only the earth lead of the pump (or solenoid valve or other appliance) should be
connected to the earth pin of the mains plug.
iv)The pump or appliance must be earthedas showed by the yellow and green
striped cables in the wiring diagrams above.
F) TECHNICAL DATA
Rated voltage 125 to 250 volts AC or up to 24 volts DC
Maximum current 16 amps
Frequency 50-60 Hz
Maximum operating temperature 50°C
Protection Grade IP68 hermetically-sealed
G) WARRANTY STATEMENT
In the case of manufacturing faults, the product will be repaired or replaced free of
charge within one year from purchase, but no liability can be assumed by the
manufacturer for damage caused to any other appliance or person as a result of such
fault. The warranty does not apply to any defects caused by misuse, improper storage,
incorrect installation or other lack of diligence and care by the client. The standard
warrantyterms of RainWater Harvesting Limited are applicable and they can be viewed
at www.RainWaterHarvesting.co.uk.
This float switch Product ID: RWH-FL01 is manufactured outside the European Union for,
and imported by, RainWater Harvesting Limited of Peterborough UK.
These instructions and images are the property of RainWater Harvesting Limited ©2010
and all rights are reserved. The information is provided for the benefit of our clients and
no reproduction is permitted without our agreement in writing.
Distributed by RainWater Harvesting Limited,
Unit A, Harrier Park, Southgate Way, Orton Southgate,
Peterborough PE2 6YQ
Phone [phone] -Fax [phone]
Email [email protected]
Web site www.RainWaterHarvesting.co.uk
Float Switch instructions Jan2010 MB
RWH064 float_switch_instructions.pdf V2