14
2). Determining the Timer Setting
The recommended setting of the Descale
Required light is determined by the
quality of the water supply. Table 2-2
suggests appropriate timer settings.
3). Switches Determine Timer Setting
The Timer Module contains a bank of
miniature switches that determine the
timer setting. The switches can be placed
in either the ON or OFF positions.
Each switch has a specific value. The
total timer setting is the sum of the values
of all of the switches that are in the ON
position. (See Figure 2-9 for switch
values).
The Descale Required Light timer is
preset at the factory with switches 1 and
2 turned ON. Adding the values of these
switches results in a setting of 384 hours
(128+256=384).
4). Procedure to Change Descale Required Light Timer Switch Settings
Read this procedure completely before starting. The Descale Required Light Timer setting
should be changed only by qualified maintenance technicians familiar with electrical safety
procedures.
a) Make sure all power to the unit is OFF.
b) Determine the time you want to set.
c) Locate the timer modules, which are located horizontally in the front, at the right and left of
the electrical drawer.
d) Set the timer switches. It is a good idea to turn them all OFF first then turn ON the desired
switches.
e) Verify that the switches are in the desired position. Replace the electrical drawer cover.
WARNING
Disconnect the electrical power before servicing.
Quality of
Feed Water
Hardness
(grains/gal.)
✳
Timer
Settings
Poor 25
128
hours
Average 15 256
hours
Good 7
384
hours
Very Good
3 or less
512 hours
Suggested Timer Settings
Based on Water Quality/Hardness
✳
17.1 ppm = 1 grain/gal of hardness
Table 2-2
128
256
512
1,024
ON 1 2 3 4
Switch
Values
(
in Hours)
Figure 2-9 Switch Values