6
HUMIDITY ADJUSTMENT.
Adjust potentiometer to the required humidistat setting, Fig. 2. To increase the humidistat set point, rotate the
adjuster anticlockwise and to decrease the humidistat set point rotate the adjuster clockwise.
The MON-MEVH reacts automatically to an increase in %RH above the set point value. If high
humidity is detected, the fan speed increases to medium for 30 minutes. At the end of this period, if
high humidity is still detected, the fan speed increases to high for 15 minutes. At the end of this period,
if the humidity is low, the fan returns to its original low setting, but if still high, the fan reverts back to
medium speed for 30 minutes and so on.
OVER-HEATING PROTECTION
The MON-MEVH motor is fitted with Standard Thermal Overload Protection. This will automatically switch
the fan Off in the event of a fault condition.
If this occurs isolate the MON-MEVH, check for and remove any obstruction, leave for a short time for the
motor to cool before reconnecting. If this recurs, Isolate the MON-MEVH and call a service engineer.
HUMIDITY RESPONSE:
The MON-MEVH reacts automatically to an increase in %RH above the set point value and the manner in
which this triggers will increase airflow depending on the original speed setting, as follows:
Low Speed Setting:
If high humidity is detected, the fan speed increases to medium for 30
minutes. At the end of this period, if high humidity is still detected, the fan
speed increases to high for 15 minutes. At the end of this period, if the
humidity is low, the fan returns to its original low setting, but if still high, the
fan reverts back to medium speed for 30 minutes and so on.
Medium Speed Setting:
If high humidity is detected, the fan speed stays at medium speed for 30
minutes. At the end of this period if high humidity is still detected, the speed
increases to high for 15 minutes and drops back to the original medium
speed setting at the end of this period.
High Speed Setting:
If high humidity is detected there is no speed change. However, at the end of
30 minutes the boost time-out will automatically reset the fan speed back to
low.
In all the automatic humidity operating modes, it is possible to override any humidity cycles in progress and
switch the fan to any other speed. However, if high humidity is still present, the unit will revert back to the
appropriate automatic humidity cycle operation.
Humidity adjustment
Fig. 2
