DHA 140 - Humidifier Master - Free user manual and instructions

USER MANUAL DHA 140 Master

HEFTE FOR BRUK OG VEDLIKEHOLD

Power supply Power /Ampere consumption * Moisture removal capacity Compressor Refrigerant Working range Water tank capacity Size (WxDxH) N.W.230 V HFC H2OWLH RT 30ºC RH 80%

Power supply Power /Ampere consumption * Moisture removal capacity Compressor Refrigerant Working range Water tank capacity Size (WxDxH) N.W.230 V HFC H2OWLH RT 30ºC RH 80%

Power supply Power /Ampere consumption * Moisture removal capacity Compressor Refrigerant Working range Water tank capacity Size (WxDxH)

The dehumidier removes water from an airow through, and the removed water is carried away from the dehu- midier with the regeneration air (henceforward called reg.–air). Water adsorption and –extraction takes place in an rotor made of water resistant silica gel. The air ows in the dehumidier divides the rotor in two parts : drying part and reg.–part. Two separate air ows goes through the rotor as this: – the main air (moist air inlet) goes through the drying part, and leaves the dehumidier as dry air – the reg.–air is taken from the process air, after passing through two purge sections of the rotor. The air is then heated to app 110°C by the build–in PTC heaters. The warm air then passes through the reg. section of the rotor and removes the adsorbed water (as water vapours). The water vapours and the reg.– air now leaves the dehumidier through the reg.– air outlet. The two air ows are xed and the rotor turns – this gives an automatic process of simultaneous adsorption and water extraction. ► FIG. 1:

5. PTC heating element,

CAPACITY DIAGRAM (FIG. 5). The inlet conditions of the air to be dried, determines how much water the dehumidier will remove. On the capacity diagram shows how much water will be removed per kg process air. Example, DHA360: (shown in the diagram – FIG. 5) – inlet air conditions 20°C, 60 %RH, gives water con- tent 8,7 g/kg – the diagram shows then dry air condition of X= 5,6 g/

– removed per kg air is then: 8,7 – 5.6 = 3,1 g/kg Capacity DHA360 at this condition: Dry air ow is nominal 400 m

/h =(x1,2) = 480 kg/h Capacity, removed water per hour = 480x3.1 = 1488 g/h = 35 kg/24h Capacity for DHA140 and DHA250 to be calculated in the same way, using 120 and 290 m

• /h. The temperature of the dry air is higher than for the inlet air. This is caused by the evaporation heat release and heat gain from the rotor. The temperature is shown to be 33°C. If bigger specic capacity g/kg is needed, this is possible if the process air is reduced to less than nominal. ► 2. APPLICATIONS Dehumidiers in the DHA range is used for dehumidica- tion of ambient air at normal atmospheric pressure. This can be an installation for moisture control in an unheated store room, in a water work building, production room for hygro–scopic materials
• – with the dehumidier in a separate installation. The dehumidier also can be used as a part of a bigger air treatment system. Here the dehumidier often will be placed in a by–pass to the main system. In this case the pressure in the main system will inuence the dehumidier – and your supplier must be contacted, as this can inuence the capacity of the dehumidier. Normally the dehumidier will be placed on the oor, on a table or in a wall bracket (option). It should always be placed horizontal, resting on the four pcs. rubber sup- ports. The air to the dehumidier should be free from solvents or other explosive components, and should be free from pollution from solid particles, oil vapours and exhaust gases from Diesel engines. For air to the dehumidier the following limit values must be respected: – max. humidity p. 100
• %RH – max. Temperature °C – max./min. pressure ambient +/–300Pa The DHA range is for indoor, stationary or temporary installations. Should not be placed in rooms with possibility for free water on the cabinet. CONTENTS p. 35

The dehumidier is prepared for external regulation by a hygrostat. Therefore a special connector for this con- nection is placed in the cabinet front cover (the black connector). The male part of the connector can be delivered as option. The cable for the hygrostat must be connected the male connector, terminals 1,2,PE. If regulation by hygrostat is needed, simply connect the two connector parts and choose pos. ”auto” on the se- lector switch. As hygrostat we recommend our DR10*) - 4512.600. Or our electronic hygrostat DA20 - 4512.601. *) Important: The DR10 hygrostat must be xed onto a wall or si- milar and must not be exposed for condensate or other kind of free liquid. The hygrostat should be approved for 10A. ELECTRIC CONNECTION The dehumidier is connected 230V, 1Ph+N+PE. The dehumidier has a 2m cable with plug for the power supply.

THE INSTALLED ELECTRIC HEATER

The PTC type electric heater is only functioning when air ow through. This is the reason why no thermostats is installed.

IT IS AN UNINSULATED LIVE WIRE. POWER CONSUMPTION & AIRFLOWS. The dehumidier is equipped with PTC heaters. The energy consumption of the PTC–heater is depen- ding of the air passing through. At the nominal air ows for the three models, the Amp for the heater is:

DHA140: 3A, DHA250:6A, DHA360: 8A

The airow and the energy consumption is regulated on the damper delivered in our standard reg.– duct system (option). NOTICE: the energy consumption of the electric hea- ter in the rst seconds is up to 2x nominal value in 5–10 sec. after switching on the heater. Special for DHA360: THE ELECTRONIC TIMER, 10K4 (on delay): The timer has the following function: – PTC heater E1 will be switched on 30 sec. after star- ting–up the dehumidier (on selector switch or by the hygrostat). The dehumidier has two PTC heaters, E1 & E2. Both are the PTC–type, which means that the switch–on Amp is 10A. When starting up the dehumidier, E2 is immediately switched on. When E2 has reached its nominal Amp (app. 5A) E1 is switched on. In this way the switch–on Amp. is reduced compared to starting up both heaters at the same time. ► 4. INSTALLATION The dehumidier should be installed indoors, placed on a wall bracket or some other horizontal basis. It should be placed on the four pcs shock absorbers underneath the cabinet. CONNECTION OF DUCTS/HOSES: The main air to be dried is normally taken from the room and through the main air lter in the back plate. The air intake is common for process air and reg.air. As standard the dehumidier is delivered with lter/lter frame for the common air intake. Reg.–air outlet should be tted with duct or hose, Instal- led draining away from the dehumidier to allow the con- densed water to run free. If this is not possible, a DN4 mm hole should be drilled underneath at the lowest part of the duct. A damper should be installed too for the adjustment of the nominal reg.air ow (reading the Ammeter). Dry air outlet can be connected duct or hose with the same size as the outlet on the cabinet. See dimensions on cabinet, FIG. 2, 3, 4. In general ducts of the same size as placed on the dehu- midier should be used – or bigger. ► 5. COMMISSIONING ELECTRIC Before starting–up the dehumidier, check that all elec- tric connections are made correctly. If this is OK, just connect the plug into the electric switch, and switch on. DHA140: The dehumidier has 2 toggle switches: – the left one: 0/I (start/stop), – the right one: Man/Auto (Auto = hygrostat controlled). DHA250, 360: The selector switch SA1 has 3 positions: – auto = operation controlled by a hygrostat – 0 = switched off – man = continuous operation “Man” means continuous operation. Especially at ”auto” (with connected hygrostat): – If it does not start–up, it can be caused by the hyg- rostat. – If the actual %RH is lower than the set value, the hy- grostat contacts are open. This can be checked like this: – adjust the hygrostat to 20%RH, and the dehumidier should then be operating – adjust the hygrostat to 90%RH, and the dehumidier should stop operating. ► 6. AIR FLOWS. Air ows should be adjusted. The dry air ow should be adjusted for the nominal m

for obtaining data from the capacity diagram. If lower dew points are wanted, you need to adjust the dry air ow to values lower than nominal. HOW TO ADJUST THE AIRFLOWS: – the dry air ow can be adjusted on the optional damper in the dry air outlet. The airow must be measured been

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 dehumidier 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 dehumidier. 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 dehumidier 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 dehumidier will then operate automatically by means of the internal control– and safety functions – controlled by an external hygrostat. ► 7. MAINTENANCE The DHA dehumidiers 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 dehumidier is operating at an optimum. We nevertheless recommend some peri- odic verication of the entire dehumidier, 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

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 dehumidier should start operating. Adjust again for the desired humidity. IF THE DESIRED HUMIDITY IS NOT OB- TAINED: ► The problem can be the dehumidier – 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 airow. 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 dehumidier, 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 dehumidier is removed, the two PTC heaters are accessible for repla- cing.en

REPLACING OF GEARMOTOR, AMMETER,

HOURCOUNTER, SELECTOR SWITCH

Remove the cabinet top cover. Remove the cabinet front cover. All cables to the dehumi- dier (fan, gear motor and heaters) are to be unscrewed by the terminals. Now the cabinet front cover is free to be unscrewed and the components accessible for replacing.

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 fan is now accessible for replacement. DHA250, DHA360: Remove the cabinet top plate. The fan is placed on the fan plate, and can easily be pulled up and out of the ca- binet. Disconnect the electric connection (separate the plug).

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 rotor is now accessible for replacement. DHA250, DHA360: Remove the top plate and pull the fan up and out of the cabinet. Remove the hose by pulling it off the duct connections Remove the two springs on the small shafts by unscre- wing the screws Unscrew the screw in the rotor shaft, remove the washer and the spring. Now the dividing plate with the reg.air connector can be pulled off the shafts, and the rotor is free for replacing too.

REPLACING THE FILTER

For replacing the lter in the air inlet, remove the screws and the net. Now the lter can be taken out and a new one installed.INDICE

3. adsorptions rotor,

DET FÖRMODLIGEN DEN EXTERNA HYGRO-

GB EC DECLARATION OF CONFORMITY

GB EC DECLARATION OF CONFORMITY