59
VAPOR-LOGIC
®
VERSION 6 INSTALLATION AND OPERATION MANUAL
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-logic board, which performs all the necessary
logic and timing functions to provide total water level control and safety
shutdown .
Vapor-logic automatically maintains the water level between the top and
middle probes (see Figure 59-1) . 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-logic 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-logic 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-logic 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 .
Water level control
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
CAUTION
Chloride corrosion
Damage caused by chloride corrosion
is not covered by your DriSteem
warranty .
Chloride corrosion can result from a
variety of causes, including, but not
limited to
• Improper water deionization
processes
• Improper water softening processes
• Humidifier’s supply water
FIGURE 59-1: WATER LEVEL CONTROL
FOR TAP/SOFTENED WATER HUMIDIFIER
