Manual master DHA 250 (page 9 of 91) (All languages)

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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 dehumidier

should then operate free blowing

– the reg.– air ow 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 ow 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

dehumidier.

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 dehumidier 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 ows adjusted, the

dehumidier will then operate automatically by means of

the internal control– and safety functions – controlled by

an external hygrostat.

► 7. MAINTENANCE

The DHA dehumidiers 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 lter should be replaced at least every 2 months

if stationary installed. At renting the dust level might

be high and the lter 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 dehumidier is operating at

an optimum. We nevertheless recommend some peri-

odic verication of the entire dehumidier, 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 dehumidier should start operating. Adjust again

for the desired humidity.

IF THE DESIRED HUMIDITY IS NOT OB-

TAINED:

► The problem can be the dehumidier – 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 airow. 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 dehumidier, 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 dehumidier is

removed, the two PTC heaters are accessible for repla-

cing.

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master DHA 250 Manual

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