Dynalab A4000D - Manuel (Page 11)

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The following instructions apply to the
A8000 Aquatron water still where the
water feed to the boiler is via the mains
supply, or a header tank.
If the boiler is to be fed with either de-
ionised or pre-treated water, please
follow the instructions on page 15.
1 Before switching on either the
mains electricity or water supply,
identify the control switches and
indicator lights on the front of the
cabinet.
Green Light
When illuminated this shows that
there is mains supply voltage to the
unit. Under no circumstances
should the cabinet end-panel be
removed when this light is
illuminated.
White “On Off” Switch
This is the primary switch for
controlling water and electricity
inside the still. The switch
illuminates when pressed in the ON
position.
Amber Light
When illuminated, this indicates
that the distillate collection
reservoir is full as detected by the
level control.
White “Clean” Switch
This shuts off the heating element
but allows water to flow into the
boiler when the still is being
commissioned or cleaned. When
pressed in the CLEAN position the
switch illuminates.
2 Carefully check the following:–
– the appropriate electricity, water
and drain services have been
provided. If in doubt, consult the
LOCATION & SERVICES section
on page 1.
– the ON/OFF switch on the
control panel is in the OFF
position.
– the CLEAN switch is pressed in
the CLEAN position.
– the Rotaflo stopcock on the
boiler level control WL48 is
closed.
– the Reservoir pressure switch is
fitted to the distillate collection
vessel.
– the dummy shorting plug is
fitted to socket item 8, fig. 4.
3 Switch on the electricity supply –
the green indicator light will
illuminate.
4 Press the ON/OFF switch to the ON
position – the switch will illuminate.
5 Recheck that the CLEAN switch is
in the CLEAN position and
illuminated.
6 Turn on the mains water supply
and using the needle valve item 18,
fig. 4, on the side of the cabinet,
adjust the flow rate to
approximately 2 litres/min.
Check that there are no water leaks
from the hose connections.
7 Observe that the boiler is now
filling with water to cover the
heating elements. When the water
has reached the pre-set level, the
excess will be discharged to drain.
Check that the drain water flows
freely and does not “back-up” into
the level control.
8 Switch the CLEAN button off by
pressing it for a second time – the
switch light goes out.
The heaters will start to warm up
and eventually run at a red glow. If
the flow rate is insufficient, the
heaters will not switch on – this will
require the needle valve to be
opened further. After about 2 to 3
mins. of operation distilled water
will emerge from the outlet pipe,
falling into the collection reservoir.
9 To avoid excessive wastage of
coolant water, make further
adjustments to the needle valve.
Slowly reduce the flowrate until the
flow control switch, item 15,
switches off the heaters – then
increase the flow until the power is
restored.
10 Refit the perspex viewing screen.
11 Safety Cut-Outs
All Aquatron water stills are
protected by the following safety
devices.
Flow Control Switch (item 15)
monitors the flow of coolant water
into the still and shuts off the
heating elements, if the flow is
insufficient.
Thermostat Cut-Out (item 23)
In normal operation the water
within the glass will be at 100°C. In
single fault conditions, i.e. in the
event of water supply failure, the
content will increase to 110°C
where upon a resettable thermostat
will operate. Once switched, the
thermostat has to be manually
reset. This is achieved by
unscrewing the black knob, fig. 4,
item 24, located inside the cabinet
and pressing the reset button.
Reservoir Control (fig. 11)
is positioned on the collection
reservoir and switches off both the
electricity and water supply when
the reservoir is full of distilled
water. The water supply is only shut
off around 7 mins. after the
reservoir is full to allow the heating
element to cool.
It is recommended that the
operation of the flow switch and
reservoir control be checked on a
regular basis.
a) Simulation of Mains Water
Supply Failure
Turn off the mains water supply
at the tap. This should switch of f
the heating element. Turning the
tap on again will switch the
heater on.
b) Simulation of Reservoir Full
Condition
Lower the glass pressure bell
WFB, fig. 11, into the distillate to
a depth of 150mm. This will
switch off the heating element
immediately and the cooling
water after 7 minutes. Raising
the bell will cause both to be r e-
supplied.
12 Switching Off
Push the CLEAN switch to the ON
position. Wait until the residual
heat contained in the heating
elements has dispersed and no
boiling is evident. Turn off water
supply. Push ON/OFF switch to OFF
position. Isolate from mains
electricity supply.
A8000 Operation