Operation (Semi-Automatic Controller) - Pentair THS Series Installation And User Manual

3.7 Operation (Semi-Automatic Controller)

The diaphragm valve style face piping kits are designed for simple operation and
maintenance. Backwashing is accomplished by turning a single knob to actuate the
diaphragm valves. The automatic controller can be set up to backwash automatically
dependant on certain chosen parameters, as well manually if required (refer to automatic
controller manual for more information). The systems backwash one tank at a time, and in
the case of the dual tank systems, each tank is backwashed with clean, filtered water.
The following section will explain briefly how to set the multiport pressure, when to
backwash the tanks, how the controllers work, how to initiate a backwash cycle, and how to
address maintenance issues.
Setting the Multiport Pressure
The multiport pressure is crucial to the operation of both the automatic and semi-
automatic controllers. The pressure of the water supplied is what actuates the
valves in the system. For the valves to actuate properly there must be 35-40 psi of
water pressure supplied to the controller. Both controller kits come with a regulator
to adjust the pressure of the supplied water. For the semi-automatic controller kit,
the regulator can be located by following the tube from the back of the multiport
pressure gauge. For the automatic controller kit, the regulator is located on the top
right side of the multiport valve enclosure, next to the multiport pressure gauge.
The regulator can be adjusted by turning the top knob (with the slot) with a flathead
screw driver. Turning the knob clockwise increases the pressure and counter
clockwise decreases pressure. Adjust the regulator until the multiport pressure
gauge reads between 35 psi and 40 psi.
When to Backwash
Backwashing is the process which is used to clean the filter tanks. There are many
ways to determine when to backwash the filters as explained in the Tank
Owner's/Operator's Manual, however, the method that is most commonly used with
the semi-automatic and automatic controllers offered is the pressure differential
method (see Section 4.1 of the tank manual). Both types of controllers offer
gauges to monitor influent and effluent pressures to make determining when to
backwash easy.
Semi-Automatic Controller Operation
Controller Overview
Diaphragm Valve Face Piping Kit Installation Manual
5/31/12
Pg. 43 of 52
Rev. F