Step 6: Set Days to Regenerate (742 Time-Clock Control Only)
Time & Day
Time & Day
Salt
SU MO TU WE TH FR SA DAYS
Capacity
Hardness
• If using 762 control – proceed to step 6a.
• Set number of days between time-clock regeneration
(regen frequency).
• Default time is 3 days.
• Days can be adjusted from 1/2 (.5) to 99 days.
• To change, press SET to make the “3” flash.
• Use the UP and DOWN buttons to change the number of
days desired.
• Press SET to accept the regen frequency, and advance to
the next cycle.
742 only: Setting days between regeneration
to zero will cause the system to not
regenerate. This setting is used for selecting
regeneration on specific days or to use with a
remote regeneration input.
• To use the 7-day timer option –see Dealer
Installation Manual.
Step 6a: Set Calendar Override (762 Demand Control Only)
Time & Day
Time & Day
Salt
SU MO TU WE TH FR SA DAYS
Capacity
Hardness
• If using 742 control – proceed to step 7.
• Set number of days for calendar override on
demand control.
• “0” days is the default for calendar override.
• Days can be adjusted from 1/2 (.5) to 99 days.
• To change, press SET to make the “0” flash.
• Use the UP and DOWN buttons to change to the number
of days desired. Press SET to accept the regen frequency,
and advance to the next cycle.
Step 7: Amount of Regenerant used per Regeneration
If the installation is a filter, skip to Filter Backwash Time. The
amount of regenerant does not apply.
• Select regenerant amount.
• The default setting is 9 lbs of salt per ft
3
of resin (110
grams/Liter).
• The 255 and 268 valves will follow the high efficiency
settings. SeeTable 1.
Table 1 - High Efficiency Exchange Capacity
Salt lbs/cu ft Exchange
Capacity
grains/cu ft
Salt grams/
liter
Exchange
Capacity
grams/liter
4 18307 60 40.0
5 21160 70 44.5
6 23490 80 48.4
7 25460 90 51.8
8 27167 100 54.9
9 28673 110 57.7
10 30019 120 60.2
11 31238 130 62.6
12 32350 140 64.8
13 33373 150 66.8
14 34320 170 70.4
15 35202 200 75.2
16 36027 230 79.3
17 36802 260 82.9
18 37533 290 86.1
Table 2
To Convert Capacity
in
Into Capacity in Multiply by
kilograms (kg) kilograins (kgr) 15.43
kilograins (kgr) kilograms (kg) 0.0648
moles of CaCO
3
kilograms (kg) 0.10
equivalents of CaCO
3
kilograms (kg) 0.05
• To program the regenerant amount, press SET to enter
the change mode. The 9 (lbs/ft
3
) default will begin to
flash. Use UP and DOWN to scroll through the available
settings. Press SET to enter the amount.
Filter Backwash Time (Filter Mode Only)
Time & Day
Time & Day
Backwash Time
SU MO TU WE TH FR SA DAYS
Capacity
Hardness
If the system is set up as a filter, the regenerant amount
is unnecessary. The controller deactivates the regenerant
amount setting, and changes to an adjustable backwash time
in minutes.
• Press SET to change the time.
• The default time of 14 minutes will begin to flash.
• Use UP and DOWN to select the appropriate backwash
time for the media type and amount used. The controller
can use 0 to 99 minutes for backwash.
• Press SET again to enter that time.
SYSTEM START UP CONTINUED
AUTOTROL 742/762 Control 255 & Performa Series Valves (263, 268, 268FA) Service Manual • 17
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