Maintenance; Trouble-Shooting Guide - VAPORSTREAM VLC Installation Instructions And Maintenance Operations Manual

Cool Down Note
Caution: Insulated and uninsulated tanks will have hot
surfaces. Allow unit to cool before performing any
maintenance. Manually open the drain valve and the fill
valve will be energized. Let the fill water run until the
tank is cooled, then shut off the field-installed supply
water valve.
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VAPORSTREAM Model VLC Only
Using softened water will significantly reduce mineral
build-up in the humidifier. When softened water is not
available, the VAPORSTREAM VLC is designed to deal
with water hardness in one of two ways depending on
the degree of hardness. For light to moderate hardness
(up to 170 mg/l), using the surface water skim time
feature with annual cleaning is recommended. For high
mineral content water (above 170 mg/l), a periodic drain
and flush through the motorized drain valve, in addition
to the surface water skim time feature, is recom-
mended. The frequency of cleaning will depend on
water condition and evaporation load.
The humidifier should be inspected for leaks at least
annually. Also, the current draw of the heaters should
be checked and all safety devices in the control circuit
should be cycled on and off to verify that they are
functioning.
Caution: When performing maintenance on the
VAPORSTREAM Model VLC, always set control
module switch to "STBY" position, place main discon-
nect in "OFF" position, and close manual water shut-off
valve.
Seasonally or as Required
1. Cleaning Tank - Slide the clean-out tray out and
dispose of any loose scale that has collected in the tray.
This should be done before the build-up reaches the
underside of the heating elements.
2. Cleaning Probes - Disconnect the plug and cable
assembly and unscrew the probe holder from the
VAPORSTREAM VLC unit. The scale will easily flake
off from the sensing portion. The sensing portion
(bottom 10 mm) of the probe should be brushed clean
with stainless steel wool.
3. Cleaning Skim Overflow Port - Loosen deposits
with a long tool, such as a screwdriver. Proper skimmer
drainage should be verified by a weekly visual inspec-
tion. Water should drain from skimmer drain pipe after
For trouble-shooting instructions, see the VAPOR-LOGIC
Installation Instructions and Maintenance Operations
Manual.

MAINTENANCE

each fill cycle. (For cleaning piping, disconnect and
flush out. If mineral deposits have restricted the flow,
replace piping.)
Summer Maintenance
After the humidification season, a complete inspection
and cleaning of the heaters, probe control, skimmer
port, and water chamber is recommended. After
cleaning, the unit should remain empty until humidifica-
tion is required.
Adjusting the Surface Skim Bleed-Off Quantity
The skim time determines the quantity of water
skimmed with each fill cycle. The skim time is field
adjustable using the VAPOR-LOGIC
Each time the VAPORSTREAM VLC refills, it fills to an
elevation near the lip of the skim overflow fitting. A
portion of the refill water then flows to drain carrying
most of the minerals left by the previous evaporating
cycle. This reduces the mineral concentration, thereby
reducing the frequency of cleaning needed.
The heated water that flows to drain is a cost of
operation. Cleaning the humidifier is also an operational
cost. Therefore, it is recommended that the user
observe and adjust the skimming quantity. By doing so,
a balance between minimizing mineral build-up and
conserving hot water can be achieved.
VAPORSTREAM
The humidifier should be inspected for leaks at least
annually. Also, the current draw of the heaters should
be checked and all safety devices in the control cabinet
should be cycled on and off to verify that they are
functioning.
Make-up Water Piping
Use cold or hot makeup water. If the water pressure is
above 410 kPa and/or water hammer would be objec-
tionable, a pressure reducing valve or shock arrester
should be installed. Even though the VAPORSTREAM
VLC has an internal 25 mm air gap, some local codes
may require a vacuum breaker.
Caution: Minimum water supply pressure is 170 kPa.
Cleaning Evaporating Chamber
As long as mineral-free water is used in the
VAPORSTREAM VLDI, no cleaning or flushing of the
evaporating chamber should be necessary.

TROUBLE-SHOOTING GUIDE

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keypad.
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Model VLDI Only
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