Home & Commercial Dehumidifiers Direct
    from
    AirControl Systems
    The Dehumidifier Specialist Established 1986

    Andil House, Court Street, Trowbridge, Wiltshire BA14 8BR Telephone: 01225 752494                      

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Dehumidifier Frequently Asked Questions


Many of your questions can be answered by reading our Frequently Asked Questions. For any specific questions please email us and we will endeavor to reply within 24 hours during working hours Mon-Fri 0900-1700.

    Q. Where do I position the dehumidifier?
    Q. Is it easy to move around?
    Q. Do I need to use it in summer?
    Q. The specifications indicate that a dehumidifier can extract 20 liters per day yet the container only holds 4 liters
    Q. What happens if we have a power failure, will the machine turn itself back on?
    Q. I bought a dehumidifier and it runs all the time - why?
    Q. Do dehumidifiers raise the heat in my house?
    Q. I have a second home. What happens if we have a power failure, will the machine turn itself back on?
    Q. Can a dehumidifier cover multiple connected rooms?
    Q. Does it filter the air?
    Q. How quiet will it be?
    Q. Do I need to buy new Air Filters?
    Q. What are decibels?
    Q. Can I have a permanent drain fitted?
    Q. How does the permanent drain work?
    Q. What if the hose becomes blocked?
    Q. Can I wall mount a dehumidifier?
    Q. Does a dehumidifier tell me my exact humidity level?
    Q. I still have condensation on windows though my dehumidifier has stopped - why?
    Q. How long will it take to get my condensation under control?
    Q. What causes condensation?
    Q. I have mould & mildew so will a dehumidifier get rid this?
    Q. What is the difference between a dehumidifier with a compressor and one without?
    Q. Do I need to change or replace the Silica on the desiccant dehumidifiers?
    Q. Is room size important when choosing a dehumidifier?
    Q. Can I dry clothes with a dehumidifier?
    Q. Will just one dehumidifier be sufficient for my home?
    Q. Which dehumidifier do I need for my garage?
    Q. Do I need to leave heating on when operating my dehumidifier?
    Q. Can I run the dehumidifier at night?
    Q. Do I have to leave the dehumidifier running constantly?
    Q. What are the running costs?
    Q. Do all dehumidifiers have a humidity control?
    Q. What is the ideal humidity level for my home?
    Q. How do I measure humidity?
    Q. Why does my dehumidifier freeze up?
    Q. Do all dehumidifiers have a water container?
    Q. Will the dehumidifier switch off when the tank is full?
    Q. When will delivery be?
    Q. Saturday Delivery?
    Q. Do I need so be in to receive the dehumidifier?
    Q. Where do I position the dehumidifier?
    A. Position the dehumidifier centrally in a home either in a hallway or perhaps on the landing. If you have a problem area then move the dehumidifier to that area.

    Q. Is it easy to move around?
    A.
    Generally yes as long as you are fit and able as all dehumidifiers have either a carrying handle (please refer to the particular model for weight and dimensions). Also castors are available for the Ebac 2000 & 6000 series of Dehumidifiers. Daitsu machines have rear recessed rollers.

    Q. Do I need to use it in summer?
    A.
    Generally no advantage unless you have condensation on surfaces. In summer, you may have doors and windows open so there is no advantage in using the dehumidifier.

    Q. The specifications indicate that a dehumidifier can extract 20 liters per day yet the water container only hold 4 liters?
    A. Maximum extraction rates are based on temperatures of either 32 deg C & 90% RH or 30 deg C & 80% RH. In the real world conditions within the UK it reasonable to expect a maximum of around 4 or 5 liters per day as the extract rates decrease with a drop in temperature.

    Q. I bought a dehumidifier and it runs all the time - why?
    A.
    The dehumidifier that you purchased is probably not capable of removing the amount of moisture in this area. If your area needs to have 50 pints of moisture removed from it daily and you have a 40-pint unit, you will never catch up and the machine will run continuously.

    Q. Do dehumidifiers raise the heat in my house?
    A.
    Yes, but this can be either good or bad. The warmer the room, the easier and more efficiently you can remove moisture so the machine will have to work less. Depending on the size of the room, you could raise the temperature by 5-10 degrees particularly if you use a desiccant dehumidifier.

    Q. I have a second home. What happens if we have a power failure, will the machine turn itself back on?
    A.
    That depends on the brand and model that you buy. Most dehumidifiers with manual humidistat controls will turn themselves back on. With the electronic controls, it varies. The Ebac, Mitsubishi and XDry units will turn back on and will continue to remove moisture at the humidity level for which you had set the machine. The Daitsu & Ruby Dry dehumidifiers will not turn back on and needs to have the "on" button pushed, and while it is a quiet and excellent machine, it would not be a good choice for a second home or if you plan to be away from your house for extended periods.

    Q. Can a dehumidifier cover multiple connected rooms?
    A.
    That depends on the total square footage of all the rooms, the configuration of the rooms, and the openness between the rooms. The more open the rooms are to each other (not 3ft doorways), the easier it is. Having ceiling fans in the rooms to move the air would certainly help. If you don’t have ceiling fans you can add small, inexpensive fans in the rooms to help move the air in these satellite rooms into the main area where you have placed the dehumidifier.
    Q. Does it filter the air?
    A.
    All machines have an air filter mainly to protect the machine. However, the Mitsubishi MJ-E16VX has a far superior filtration system that includes a Photo catalytic filter. If you specially want clean air then please look at the Daikin MC707B air purifier
    Q. How quiet will it be?
    A.
    Each make and model may differ in sound levels that are measured in (dBA). The higher the (dBA) the higher the sound level. Remember, an increase in 6(dBA) is a doubling of sound. The Ebac Amazon is particularly quiet along with the Daitsu ADD12 & Daitsu ADD20. The extremely popular Mitsubishi MJ-E16VX is a very smooth running dehumidifier with an almost inaudible compressor.
    Q. Do I need to buy new Air Filters?
    A. You should replace the air filters on Ebac machines every few months. Some general-purpose filters can be Vacuumed or even washed out. Daitsu, Meaco MEA10L, DD122FW, DD122FW “Simple” & Mitsubishi filters can be brushed or washed. The Mitsubishi Photo catalytic filter can be washed a number of times but should be changed every 2 years. The carbon filter on the Ruby Dry must be used at all times and checked once per month. The carbon filter can be washed out but it is recommended that this is replaced annually.
    Q. What are decibels?
    A.
    Q. Can I have a permanent drain fitted?
    A. Yes, permanent drain kits are available for the Ebac range. The XDry & DD12FW come complete with a drain hose. The Ruby Dry requires a ” i.d. hose that we can supply. The Mitsubishi & Daitsu require a 15mm i.d. hose that we can also supply.
    Q. How does the permanent drain work?
    A. The hose connects to a drain point on the dehumidifier and the hose outlet must be lower than the dehumidifier drain point as it is a gravity drain only.
    Q. What if the hose becomes blocked?
    A. On all domestic machines the water would then go back into the integral tank and once full will switch off the dehumidifier.
    Q. Can I wall-mount a dehumidifier?
    A. We do not sell any domestic dehumidifiers that can be wall mounted.
    Q. Does a dehumidifier tell me my exact humidity level?
    A. Only the Mitsubishi MJ-E16VX has a digital readout. Purchasing a Thermo-hygrometer is recommended so you can measure relative humidity and compare it with the setting on your dehumidifier
    Q. I still have condensation on windows though my dehumidifier has stopped - why?
    A.  Either you have the setting on the dehumidifier too high or the dehumidifier is under sized. While a relative humidity level of 50% may be ideal for your home, you may have to lower the level in periods of colder weather and make your dehumidifier work harder. In larger premises you may need more than one dehumidifier
    Q.  How long will it take to get my condensation under control?
    A. This depends on the level of the problem. Generally, you will see an improvement within a few days but do allow 1- 2 weeks to get the problem under control.
    Q. What causes condensation?
    A. In Britain, condensation in houses is mainly a winter problem particularly where warm moist air is generated in living areas and then penetrates to the colder parts of the building.
    The moisture in the air comes from a number of sources within the house. Water vapor is produced in relatively large quantities from normal day to day activities - a 5 person household puts about 10 kg of water into the air every day (without taking into account any heating) - i.e. 
    - breathing (asleep) 0.3 kg
    - breathing (awake) 0.85 kg
    - cooking 3 kg
    - personal washing 1.0 kg
    - washing and drying clothes 5.5 kg
    - heating - especially paraffin and flueless gas heaters. For every litre of paraffin burnt over one litre of moisture vaporizes into air. Every carbon fuel produces some amount of water from combustion.
     * (1 kg of water equates to about 1 litre)
    Moisture can also be drawn from the structure of the building into the internal air; from below the floor or through the walls/ceilings.
    Q. I have mould & mildew so will a dehumidifier get rid this?
    A. Yes, a dehumidifier will help prevent further problems but you must use a mould spore remover to actually kill the spores.
    Q. What is the difference between a dehumidifier with a compressor and one without?
    A. Traditionally dehumidifiers worked on the refrigeration principle where air passed over a cold refrigerated coil and moisture condensed on the coil and drained into a container. The compressorless adsorbent machines such as the Ruby DryXDry & the DD122FW MK3 work on the principle of moist air being drawn into an adsorber that is a slowly rotating disc impregnated with silica. A heating element applies heat to the adsorber that heats the moisture to a high temperature vapor that is immediately released from the absorber and condenses into water that falls into the collection tank. An absorption dehumidifier is more efficient at colder internal temperatures and can often be quieter.
    Q. Do I need to change or replace the Silica on a desiccant dehumidifier?
    A. No, there is nothing to replace unless the desiccant disc is damaged
    Q. Is room size important when choosing a dehumidifier?
    A. Yes and no. What is most important is the amount of water you need to take out of the air. The more water in the air, the larger the capacity you will need. A small room with a lot of moisture may need as much dehumidification as a large room with average moisture content. When in doubt, it's always better to oversize a dehumidifier.
    Q. Can I dry clothes with a dehumidifier?
    A. Yes you can. Ideally place your clothes on a drying rack and place the dehumidifier in the same room and leave on a continuous or Laundry setting. Shut the door to that area and the dehumidifier will take in all moisture. The Mitsubishi, Daitsu, EcoAir Range all have a Laundry setting. The Ruby Dry is also excellent for this purpose. These machines have a high airflow to assist with the drying.
    Q. Will just one dehumidifier be sufficient for my home?
    A. Normally one will be sufficient but in the case of very large houses or where you may have several floors then more than one may be required
    Q. Which dehumidifier do I need for my garage?
    A. Garages are generally unheated so consider the Adsorption dehumidifier such as the Ruby Dry, DD322 Classic or DD322 Simple as these operate in low temperatures without losing extraction capacity. Larger Garages may need more than one machine.
    Very large car storage areas, warehouses etc should consider commercial dehumidifiers.
    Q. Do I need to leave heating on when operating my dehumidifier?
    A. The warmer the air the easier it is to extract moisture. Using a Ruby Dry, XDry or DD122 is ideal if the temperature is generally on the colder side as these machines maintain extraction rates regardless of temperature.
    Q. Can I run the dehumidifier at night?
    A. Yes you can but be aware that there will always be a sound from the machine when it is operating. Choose a quiet dehumidifier if it is to be used near bedrooms. Or use the dehumidifier from early morning until late evening and then turn the machine off. If the machine is in a hall and bedrooms are upstairs then you may not even hear the machine.
    Q. Do I have to leave the dehumidifier running constantly?
    A. All dehumidifiers are fitted with a humidistat that controls the operation of the machine. When the humidity level is satisfied, the dehumidifier will switch off though some machines allows the circulation fan to continue after dehumidification has stopped. Sometimes this can be beneficial to maintain circulation.
    Q. What are the running costs?
    A. It costs around 10-12 pence per hour for 1kW of electricity. On each product we display the wattage so therefore a 300w machine will cost 3-4 pence per hour depending on what you pay for your electricity. With an average dehumidifier it will cost around 3-4 pence per hour if running continuously though adsorption machines will have a higher cost around 5 pence per hour. However, the adsorption machines such as Ruby Dry, XDry and the DD122 will do the job quicker at temperatures below 20 deg C and therefore overall costs may be less than with a conventional dehumidifier.
    Once the house is brought under control the actual running costs will reduce significantly, as the dehumidifier will need to operate less.
    Q. Do all dehumidifiers have a humidity control?
    A. Yes they have. The Ebac 2000 range has auto and manual control. The Ebac 6000 range is fully automatic. The Ruby Dry has a setting of 40/50/60 %RH. The XDry controls levels to around 40-45% or 55-60% depending on setting. The Mitsubishi VX model is adjustable from 50-70% in 5% steps with an accuracy of +/-1%. Daitsu machines can be set to 50, 60 or 70% and are accurate to +/-4%
    Q. What is the ideal humidity level for my home?
    A. Between 40 and 60% so the ideal would be 50%.
    Q. How do I measure humidity?
    A. We supply a desktop digital thermo-hygrometer that displays current temperature and relative humidity.
    Q. Why does my dehumidifier freeze up?
    A. The coils of refrigerated dehumidifiers will ice up but a sensor or timer will stop the compressor and allow the ice to melt either by circulation ambient air or using a method called hot gas defrost that reverses the refrigerant flow to force hot refrigerant vapor through the coil and so the ice melts quickly and the machine start again much quicker Hot Gas Defrost is found on the Mitsubishi Models. Icing up to a certain extent is normal but severe icing up can be due to a shortage of refrigerant, insufficient airflow or a malfunction.
    Q. Do all dehumidifiers have a water container?
    A.Yes, all domestic dehumidifiers have a container that ranges from 3.5 liters to 5.5 liters capacity.
    Q. Will the dehumidifier switch off when the tank is full?
    A. Yes, all tanks are fitted with a float switch so once full they will shut off the compressor or in the case of an absorption machine the heater element will shut off
    Q. When will delivery be?
    A. If you order prior to 1pm on any working day you will receive the machine the following working day. However, deliveries to the Highland & Islands or to Northern Ireland may take 2/3 days. An AM or Saturday delivery is available at extra cost.
    Q. Saturday Delivery?
    A. We can arrange delivery on a Saturday for an additional cost of 16
    Q. Do I need so be in to receive the dehumidifier?
    A. No, as long as you have a safe place where it can left and give us your permission along with leaving a note with your signature for the delivery company. We can also arrange delivery to your workplace if that is more convenient to you.
 

AirControl Systems Andil House, Court Street, Trowbridge, Wiltshire BA14 8BR Telephone: 01225 752494 Fax: 01225 763486

 

Dehumidifier Frequently Asked Questions & Answers