7
START-UP AND OPERATION
LW415 Electronic Water Level Control Module
When the power is activated, the solenoid-operated water
fill valve will open, filling the evaporating chamber. Filling
will continue until water reaches level A (figure 8-1), at
which time the fill valve will close. To ensure that a water
seal is created in the field-installed water seal, disconnect
probe plug and cable from probe rod assembly (located
on the top of the tank), allowing the fill valve to re-
energize and overfill humidifier tank. This process will
take only seconds; probe plug and cable must then be
reconnected. A call for humidity will then energize the
heating element.
Water Refill
During operation, when the water line drops below level B
the fill valve opens, and remains open until the water line
returns to level A (figure 8-1).
Heater Protection
Should the water line ever drop below level C, the heaters
are de-energized and remain OFF until the water line has
been restored to level C. This feature provides heater
protection in the event of a low-water condition.
Drain/Flush Feature
This control module contains an integral electronic timer
which tracks the humidifying time of the unit. When this
accumulated time reaches what has been set in the
timer, the drain/flush cycle is activated.
Upon activation, the following sequence occurs:
1.
The drain valve opens and begins to drain surface
water and minerals from the evaporating chamber.
2.
When the height of the water drops to the “REFILL”
level, the fill valve opens.
3.
The drain and fill valves remain open for ten more
minutes, flushing the chamber.
4.
The drain valve then closes, the chamber refills, and
the fill valve closes. The timer resets and the unit
resumes normal operation.
The electronic timer comes factory-set for drainage after
40 hours of operation. Alternate settings of 20 hours and
80 hours are available. See wiring diagram(s) attached to
unit for timer board location and instructions for changing
the timer setting.
Start-up and Checkout Procedures
After the system has been properly installed and con-
nected to both electrical and water supplies, it may then
be started.
Mounting
Check mounting to see that the unit is level and securely
supported before filling with water. Refer to page 6 for
mounting hole locations.
Piping
Verify that all piping connections have been completed as
recommended and that water pressure is available. Refer
to page 5.
Electrical
Verify that all wiring connections have been made in
accordance with all governing codes and the enclosed
wiring diagram. Refer to page 5.
Caution: Only qualified personnel should
perform start-up procedure.
A simple three-probe conductivity sensor cycles a
solenoid-operated water fill valve to maintain the proper
water levels.
The CRU
®
V humidifier is available with either the standard
LW 415 Electronic Water Level Control Module or the
optional VAPOR-LOGIC
®
3
microprocessor control system.
If your system is equipped with the VAPOR-LOGIC
3
system, see the
VAPOR-LOGIC
3
Operations and Mainte-
nance Manual for more information. Then continue
reading this manual beginning at the maintenance section
on page 9.
OM-211-2
Figure 8-1: Electronic
Probe Control for
Maintaining Proper
Water Level (CRUV
®
)
A
B
C
