Master DHA 140, User And Maintenance Book

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measured and adjusted on the damper for the nominal
value.
Free blowing, the capacity in kg/h will increase: If the
demand for very dry air is not needed, the dehumidifier
should then operate free blowing
– the reg.– air flow can be adjusted on the damper in
the reg.–air outlet (option). Start–up with the damper
in the closed position, opening until the Ammeter in -
dicates:
DHA140: 3A, DHA250:6A, DHA360: 8A
Notice: DHA140 has no Ammeter installed and the Amp
must be measured using an Ampere instrument.
IMPORTANT :
Reg.–air flow always has to be controlled. Check the
reg.–duct for allowing free blowing of the reg.–air.
Check that the reg.–air duct is installed draining from the
dehumidifier.
SPECIAL FOR DHA360:
STARTING–UP OF THE HEATERS:
The two heaters E1 & E2 starts up with 10K4 delaying
E1 with 30 seconds.
On the Am–meter this will be indicated like this:
– when the dehumidifier is switched on, the Am.meter
shows 10A in app. 5 sec., and fall down to 5A.
– after 30 sec. E1 is switched on and the Ammeter
show app. 18A for 5 sec., and then it fall down to
8,00A with the reg–air correctly adjusted.
With the electrical settings and air flows adjusted, the
dehumidifier will then operate automatically by means of
the internal control– and safety functions – controlled by
an external hygrostat.
►►
►
7. MAINTENANCE
The DHA dehumidifiers only needs a minimum of main -
tenance. All components are service free, which means
no lubrication or adjustment.
Only three things should be checked under normal ope -
ration:
– air filter should be replaced at least every 2 months
if stationary installed. At renting the dust level might
be high and the filter must be replaced often – and
the cabinet and rotor should be cleaned after each
period,
– the rotation of the rotor should be checked once a
month,
– the power consumption of the electric heater should
be checked often (reading on the Ammeter, Excl.
DHA140)).
Rotation of the rotor can be checked through the dry air
outlet if no duct is connected). The rotor should then turn
clockwise.
If the rotor rotates during operation, and the energy con -
sumption of the electric heater shows nominal Amp, you
can be almost sure that the dehumidifier is operating at
an optimum. We nevertheless recommend some peri -
odic verification of the entire dehumidifier, to see if all
internal functions are OK and checking of gaskets and
moving parts for wear and tear.
This will ensure that the capacity is on its maximum, and
thus won’t waste any energy.
►► ► 8. TROUBLE SHOOTING
IF THE DEHUMIDIFIER DOES NOT START
WHEN ELECTRIC CONNECTED:
► check the external fuse
IF THE DEHUMIDIFIER IS NOT OPERA -
TING IT IS PROBABLY THE EXTERNAL
HYGROSTAT WHICH HAS BROKEN:
► This is a normal situation when the desired humidity
is obtained. To check: adjust the hygrostat for 20%RH,
and the dehumidifier should start operating. Adjust again
for the desired humidity.
IF THE DESIRED HUMIDITY IS NOT OB -
TAINED:
► The problem can be the dehumidifier – or the oth -
er parts in the total installation ( room tightness, hyg -
rostat...). To verify this, check:
– rotation of rotor ?
– the dry air should be 15–20°C warmer than the inlet
main air. If it is cold it could indicate that the rotor is
not turning caused by broken drive belt or the motor
has stopped.
– by hand feel the temperature of the reg. outlet air, and
feel the airflow. The temperature is depending on the
inlet conditions, but should be 40–60°C.
► If the temperature is higher it could indicate that the
rotor is not turning.
► Check the Ammeter reading, must be nominal value:
DHA140: 3A *), DHA250:6A, DHA360: 8A
*) no Ammete
If it is cold and Ammeter shows 0A, the electric heater
might need replacement.
THE UNIT IS TOO NOISY:
► Check whether the unit is sitting on a level surface.
THE UNIT IS LEAKING:
► Make sure the unit is in good shape.
► If you are not using continuous drainage, make sure
the rubber plug (at the bottom of the unit) is in its posi -
tion.
►►
►
9. SERVICE/REPAIR
SAFETY INSTRUCTION
Before opening the dehumidifier, make sure that the
electric power is switched off on the main switch. Pull
the power plug to be sure.
REPLACING THE ELECTRIC HEATERS
DHA140:
Remove the cabinet top cover.
Remove the internal hose for the reg–air outlet.
Release the total internal assembly, and pull it out of the
cabinet.
The PTC heater is now accessible for replacing.
DHA250, DHA360:
When the small cover in the front of the dehumidifier is
removed, the two PTC heaters are accessible for repla -
cing.