DriSteem Vapor-logic 4 User Manual

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Probe system
Humidifiers with tap/softened fill water use conductivity probes
to measure and control the water level for optimum operating
efficiency. Water conductivity must be at least 30 µS/cm for the
probe system to operate. The three-probe system is monitored by
the Vapor-logic4
board, which performs all the necessary logic and
timing functions to provide total water level control and safety
shutdown.
Vapor-logic4
automatically maintains the water level between the
top and middle probes (see Figure 55-1). When the water level falls
below the middle probe, the fill valve opens until the water level
rises to the top probe. Water must remain in contact with the probe
surface for three seconds for Vapor-logic4
to determine that the
water is at the probe’s level.
Conversely, water must stay out of contact with the probe surface
for three seconds for Vapor-logic4
to determine that the water
is below the probe’s level. This three-second delay ensures that
turbulence does not cause an incorrect level reading.
Each time the fill valve energizes, the Vapor-logic4
system tests
the probe system. If the signal from the probe assembly begins to
deteriorate, the “Clean probes” message appears in the Messages
Log. Once the probe system reaches its maximum usable life,
the humidifier shuts down and the “Faulty water probe” alarm
appears.
An adjustable skim time allows for an extended skim period
(0 to 120 seconds) to reduce mineral accumulation. When
skimming, the fill valve remains energized after the water level
reaches the top probe for the amount of time specified by the skim
duration. The skim duration is adjustable in one-second intervals
through the Setup menu.
If the water level falls below the low-water cutoff probe, heating
outputs are disabled; this provides low-water protection for the
heating outputs.
See “Chloride corrosion” Caution at right.
Figure 55-1:
Water level control for tap/softened
water humidifier
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Operation
Humidifiers using tap or softened water
control water levels electronically using a
three-rod probe. The controller responds
with the above actions when the water
level reaches each rod.
VLC-OM-030
Fill valve opens when
water level is below this
probe.
Low-water cutoff. Power
to heaters is cut if water
level drops below this
probe.
Fill valve closes when water
level rises to this probe.
mc_030910_1335
XT humidifiers do not use conductivity probes
for water level control. See “Electrode steam
humidifiers” on Page 57.
CAUTION
Chloride corrosion
Damage caused by chloride corrosion is
not covered by your DRI-STEEM warranty.
Chloride corrosion can result from a
variety of causes, including, but not
limited to
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DriSteem Vapor-logic 4 Specifications

General

Brand	DriSteem
Model	Vapor-logic 4
Category	Controller
Language	English