31
CRUV INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
OPERATION
AUTOMATIC DRAIN AND FLUSH (TAP/SOFTENED WATER)
The LW series controller employs an electronic timer that tracks the humidifying
time of the unit. The controller activates a drain/fl ush cycle when a
predetermined humidifying time has elapsed (factory default is 40 hours), and
the following sequence occurs:
1. Drain valve opens, draining mineral laden water from tank.
2. Draining continues until a predetermined time has elapsed (factory default
is 10 minutes).
3. Flushing occurs during the last 10% of drain period.
TEST CYCLING DRAIN/FLUSH (TAP/SOFTENED WATER)
The dip switches on the control board can be used to test the drain/fl ush cycle
as follows:
1. Slide dip switches 1, 2, and 3 to OFF position, which
is self test mode.
2. Set humidistat high, so call for humidity remains for at
least 15 minutes.
The following sequence occurs:
a) Drain valve opens after about two minutes, and
water level drops.
b) When water level drops below middle probe (see
Figure 3-1), fi ll valve opens.
c) Fill valve and drain valve remain open for drain/
fl ush period, then drain valve closes.
d) Water level rises to top probe, and fi ll valve closes.
3. When drain/flush test cycle is complete, return dip
switches 1, 2, and 3 to desired operating mode (see
Table 31-1). Failure to do so will result in a drain/flush
cycle every two minutes.
Table 31-1:
Autodrain settings
Switch
Drain time
Interval
time
1
2
3
Self test
Off
Off
Off
10 min.
2 min.
Disabled
On
Off
Off
-
-
Option
Off
On
Off
10 min.
20 hours
Option
On
On
Off
30 min.
20 hours
Factory
settings
Off
Off
On
10 min.
40 hours
Option
On
Off
On
30 min.
40 hours
Option
Off
On
On
10 min.
80 hours
Option
On
On
On
30 min.
80 hours
End-of-season drain
The end-of-season drain option drains the
tank after 72 hours of no call for humidity
to minimize microbial growth inside the
humidifi er. When there is a call for humidity,
the tank fi lls and the unit runs when the
operating level is reached.
LW series controller dip switches
Drain/fl ush intervals of 20 hours and 80
hours are available (factory default is 40
hours) and can be set via dip switches on
the control board (see Figure 32-1). See the
wiring diagram(s) attached to the unit for board
location and instructions for changing the dip
switch settings, and see Table 31-1.
Start-up and operation: LW series controller
