3
3.1 ELECTRICAL CONTROLS
SWITCHES
ISO 1
Isolator
Function
Switches mains power to the unit
S1
Selector switch
Label: MAN - BACK FLUSH - AUTO
Function
Selects between the following operations:
MAN
- Manual operation of the pump. Press the "START" button
(PB2) to energise the pump; release PB2 and the pump will stop.
BACKFLUSH
- with the valves in the correct position, press the
"START" button (PB2) to pump clean water into the vessel, in the
reverse direction to normal filtration.
AUTO
- the unit will run automatically, with the pump being con-
trolled via the float switches in the wash tank for normal filtration
PUSH BUTTONS
PB1
Push button - RED, latching
Label: STOP
Function
When pressed, PB1 will disable the pump control circuit
PB2
Push button - GREEN
Label: START
Function
When pressed, PB2 will start the pump running when the S1 switch
is in the Manual and Backflush positions.
LAMPS
LP1
Lamp - CLEAR
Label: MAINS ON
Function
When lit, LP1 signifies that the mains power is on.
LP2
Lamp - RED
Label: HIGH PRESSURE
Function
When lit, LP2 signifies that the pressure within the vessel or pipe-
work is too high.
4. OPERATION
The S500 is fitted with safety pressure switches (PS1, 2 & 3) which will stop the
pump running and illuminate a lamp LP2 "High Pressure" if any blockages occur
during the normal filtration and backwash cycles. Pressure setting is 5 bar (70 psi).
4.1 NORMAL FILTRATION
For normal filtration, firstly check the valves are in the correct position:
Valve 1 - Open
Valve 2 - Open
Valve 3 - Open
Valve 4 - Closed
Valve 5 - Closed
Valve 6 - Open
Valve 7 - Closed
Switch on the isolator the "Mains On" lamp will be illuminated and set the selector
switch Si to the "Auto" position. Reset the "Stop" button PB1.
When the wash tank is used and enough contaminated water collected to activate
the high float switch the pump motor will switch on and pump the contaminated
water through the system.
4.2 BACKWASH
A pressure reading of 10 psi on gauge 1 dictates the necessity to backwash. Alter
the position of the following valves:
Valve 3 - Closed
Valve 4 - Open
Valve 5 - Open
Valve 6 - Closed
Arrange for a drum to collect the slurry that will escape from the backwash outlet
during this operation. Backwashing should last for 5 minutes.
NOTE: DO NOT ALLOW THE WATER LEVEL IN THE WASHTANK TO FALL BELOW
THE LOW LEVEL FLOATSWITCH. DO NOT ALLOW THE PUMP TO RUN DRY
To discharge exhausted carbon, determined when pressure gauge 2 reads 10 psi
and after a backwash has been done. Close valves 4, 5 and 6 and open valve 7.
Start the unit running, clean water from the wash tank will be pumped into the car-
bon filter. The exhausted carbon will discharge from valve 7 in a form of a slurry.
Collect the carbon slurry in a perforated container allowing the water to drain away
leaving the contaminated carbon for safe disposal.
