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2 regenerating iron filters - model 942, 3 backwashing filter - model 942f – Watts Autotrol Magnum (CV+ Series) User Manual

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Figure 5.10 Regeneration Complete

It is important to note that the numbers on the Salt Dial
represent “MINUTES” of water refill time. To determine
the total pounds of salt that will be used for a
regeneration, it is necessary to know the refill control
that is used in the conditioner. The refill control
determines the flow rate of water into the salt tank
during the refill cycle. Refer to the Salt Use Table 5.8 to
determine the total pounds of salt used per
regeneration for the various size tanks.

5.2.2 Regenerating Iron Filters - Model 942

Filter medias used in the water treatment industry
generally require only a periodic backwashing with
water to maintain their filtering efficiencies. These type
of filters would use the 942F control described in the
next section. Manganese greensand media, typically
used for iron removal, requires regular regeneration
with an oxidizing chemical, potassium permanganate
(KMNO

4

) similar to the regeneration of a water softener

with salt. This application requires the use of the Model
942 control.

Common Settings
Setting the Time of Day, Days of Regeneration, and the
initiation of a Manual Regeneration are as previously
described in this section.

Adjusting The Regenerant Setting - Model 942
Refer back to the previous heading in this section
Adjusting the Salt Setting - Model 942. Setting the
number of “MINUTES” of refill time determines the
amount of regenerant chemical used per regeneration.
Refer to the Regenerant Use Table 5.9 for the proper
setting based on tank size and the number of cubic feet
of media used.

NOTE: Only two sizes of refill flow controls are
recommended when the Magnum Cv Series control
valve is used in a manganese greensand filter system.
The Magnum control valve must be ordered with the
proper size refill flow control or changed in the field.
The incorrect refill flow control could underfill or overfill
the regenerant tank resulting in a system malfunction.

5.2.3 Backwashing Filter - Model 942F

Adjusting the Backwash Setting
The Backwash Dial (Figure 5.11) controls the backwash
time. With the Indicator Knob in the BACKWASH
COMPLETE position, rotate the Backwash Dial
counterclockwise at least one full turn to cancel out the
current setting. A light clicking sound will be replaced
by a heavier clicking sound when the previous setting
is cancelled. Once the heavier clicking is heard, the
new setting may be set by rotating the Backwash Dial
to the desired setting. The numbers on the Backwash
Dial represent “MINUTES” of backwash time.

Figure 5.11 Backwash Complete

Table 5.6 Cycle Times for 942 Control

Cycle

Time (Minutes)

Backwash

17

Brine/Slow Rinse

95

Purge

9

Refill

2 to 24

Salt Dial

Indicator Knob

Table 5.7 Cycle Times for 942F Control

Cycle

Time (Minutes)

Backwash

8 - 30

Purge

9

Backwash Dial