Teuco 620 Gebrauchsanweisung Seite 48

EN
CLEANING THE SAND FILTER
The sand filter consists in a bed of micropearl quartz sand.
During operation, organic impurities suspended in the pool water are trapped by the sand medium as the
stream passes through the filter.
The design of the filter guarantees uniform distribution of the water passing through the sand bed,
preventing any tendency to form localized channels that would significantly reduce the filtering capacity
of the medium.
When a new system is started up for the first time,
make a note of the filter pressure gauge reading.
The sand in the filter is cleaned by backwashing:
• when the pressure indicated by the gauge
exceeds the value first recorded (newly installed
system) by 0.5 bar
• whenever pressure reaches 1.5 bar, in any
circumstances .
Set the control panel switch to the "STOP"
position every time the selector lever is
shifted.
Failure to observe this general rule can result
in serious damage to the system and invalidate
the warranty.
• Position the selector valve on "backwash"
and run the pump in "MAN" for 1 minute
approximately. Check the state of the water
by inspecting through the sight glass on the
selector valve .
• Position the selector valve on "rinse" and run the
pump in "MAN" for 30 seconds approximately .
This step serves to resettle the sand bed after
backwashing.
• Return the valve to the "filter" position and
start the pump in "MAN". Backwashing uses a
considerable amount of water from the overflow
tank. If the backwash procedure stops as a
result of there being insufficient water in the
tank, wait a few minutes for the system to make
up the level (solenoid valve opens automatically
to allow water in).
After several years operation, the filtering
action of the sand may become less effective; if
so, have the sand renewed.
When this operation
contact an authorized Teuco service centre.
48
becomes necessary,
620