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INTRODUCTION
On-site pre-installation preparations
The following items should be set up on site before the installation of the filtration system.
Electricity connection
The BackFlush controller is supplied in either of two versions:
•
100-240v AC input - powered by an external 100-240v AC to 12v DC power supply.
Requires mains electricity supply - 100-240v AC ~, 50/60 Hz 0.4 A Max.
Ensure that suitable electrical power supply is available in the vicinity of the BackFlush controller
A readily accessible circuit breaker, rated according to the BackFlush controller's total rated power for
peak demand, certified as a branch circuit over current protector, compliant with the national code and
requirements. Grounding connection: ≤ 10 Ω.
•
6v DC input - powered by 4 x 1.5v D-size alkaline batteries (not supplied).
Does not require mains electricity supply.
NOTE
If the filtration system was not ordered with a BackFlush controller and is intended to be connected
to an existing irrigation system controller, see the irrigation controller user manual for instructions.
Concrete slab construction
The sand filtration system will weigh anywhere
from 250 kg up to a few tons. The system
foundation must take into consideration the total
weight of the system when filled with sand and
water.
The media filtration system should be installed on
a concrete slab, at least 10 cm thick, with proper
reinforcement and anchored to the ground.
The dimensions given in the table on the right are
the external filtration system dimensions and not
the concrete slab dimensions
The minimum slab dimensions should allow a
sufficient margin around the filtration system for
service and maintenance.
The slab should have a slight grade to allow for
water run-off, but not so great that the manifold
does not bolt together easily.
The soil all around the slab should be compacted
to prevent erosion.
Straight-line filtration systems*
20" tanks
2
3
4
5
24" tanks
2
3
4
409/120/132
5
489/120/132
*For other filtration system configurations,
contact your local Netafim™ representative.
**Filled with sand and water
DOUBLE-CHAMBER INSTALLATION MANUAL 5
SANDSTORM
™
External filtration system
dimensions
(length/width/height)
cm
inch
209/120/132
82/47/52
269/120/132
106/47/52
329/120/132
130/47/52
389/120/132
153/47/52
249/120/132
98/47/52
329/120/132
130/47/52
161/47/52
193/47/52
Total system
weight**
kg
lbs
500
1102
750
1653
1000
2205
1250
2756
720
1587
1080
2381
1440
3175
1800
3968
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