Carel MC Serie Manual Del Usuario página 42

7 Air pressure variations
at the cabinet output.
8 Air pressure insufficient
to carry the water flow.
9 The air flow is present
but there is no water flow
or its pressure is too low
although the 'water' LED
indicator on the AD4 is ON.
10 No water to the nozzles.
11 The pressure is too high
and difficult to control.
12 Low water absorption in
the duct: the water inlet
zone is wet.
13 'Rain' effect in ambient
applications.
a) People feel wet all around; a good absorption of the
b) The floor gets wet.
14 The nozzles drip while
the unit is OFF.
The humidification system
has few atomizing heads
and/or there is not enough
space between them.
C1: The output air pressure
is too low.
C2: ON/OFF version only:
the mechanic pressure
switch at the end of the
air line does not accept
pressure values higher
than 1.3bar (the "water"
LED indicator on the AD4
card is ON).
C3: Proportional version only:
disconnected or faulty
pressure probe.
C1: Electrovalve on the water
line not powered (see point 8).
C2: Pressure regulator set at min. S2: See page 21 above.
C3: Clogged pressure regulator S3: Clean the pressure reducer (it is not necessary
(the water does not flow).
C4: Clogged electrovalve.
C5: The output N.O. valve
remains always open:
outlet water loss.
The atomizing nozzles have
been placed at considerable
height and you have not taken
into account the pressure
drop when setting water
pressure.
C1: Impurities compromising
the normal activity of the
pressure regulator.
C2: The output water line
is closed.
C1: Water speed too high with S1: Check the unit's data in relation to the application
respect to the distance
among the nozzles, the
cold coil (or drop separator)
and in relation to the
temperature and humidity
of the treated air.
C2: Incorrect nozzles position. S2: Replace the atomizing nozzles so as to optimize
The atomized water cones
cross each other or they hit
and condense on the opposite
surface of the duct.
There are no optimum temper. Close the water line (turn the screw on the back part
and humidity conditions to ensure of the nozzle),
atomized water (due to the
incorrect position and/or
setting of the nozzles).
C1: The nozzle always houses
some water coming from
the higher water line.
C2: The drying cycle is too
short.
Close gently the air line at the cabinet outlet by means
of the ball valve. Pressure to the heads should not
be set below 2.1bar.
S1: Check the value of the inlet and outlet air pressure
and the air pressure regulator.
S2: Turn the screw on the pressure switch so as to
enable the setting procedure.
S3: Check that tension between terminals Ic and G0 on
the AD4 card is >1Vdc.
S1: See point 8. Check that power to the line is 24Vac.
to remove it from the water line).
S4: Remove the electrovalve and clean it.
S5: Be sure that the valve is not clogged and that the
line is powered.
Increase pressure (see pages 22/23).
S1: See point 9, solution S3.
S2: Charge/Open the water line.
requirements (see section 4 above). Look at the
psychrometric diagram to be sure that your installation
has been correctly rated. You can reduce capacity
of each single atomizing nozzle by adjusting the screw
on the back part of the nozzle. If possible, reduce the
speed of the fans and increase or set a pre-heating cycle.
the outcome.
then adjust again the nozzle spray patt.s.
S1: It is advisable to lower the water line (place it below
the atomizing nozzle).
S2: Increase the time-interval of the cleaning cycle
(potentiometer P3) until the drops stop (the "mist"
effect must disappear).
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Cod. +030221742 rel. 2.2 – 16.06.2005