Dehumidifier for the whole home installation bungalow [Dehumidifier for the Whole Home Installed]

Considerations of adding a DH1200 dehumidifier to the home. A three bedroom, semi detached post war bungalow with conservatory. Suffering humidity problems mostly in winter.
Dehumidifier easily added to a home to solve condensation issued such as dampness, window condensation and mould. A DIY dehumidifier installation.
Issues with condensation, mould in wardrobes and general heavy feeling to the air. Only one occupant who is hyper sensitive to sound. Therefore, a timer was added so the dehumidifier would only work outside of normal sleeping hours. Usually this would not be needed.
220V supply 50 Hz , auto power reset in case of power supply interruption. “3-hole” technology commercial desiccant dehumidifier; water removal 12 litres maximum extraction. Operating range from -20°C up 40°C maximum room temperature for continuous drying applications, with 124 m3/hr air volume capacity (124 m3/hr - Process / 20m3/hr - exhaust air flow). Highly efficient, very quiet fan operation and yet low energy consumption in use for large moisture extraction capacity. 52dB Process air in 125mm - Process air out 125mm - Exhaust air 40mm
EPD50 / DH1200 LOCATING IN AN ATTIC
A popular location for the EPD50 / DH1200 is in the attic or in a void in the attic, crawl space or basement.
1, Exhaust the wet air through a duct to an overhang eaves through soffit boards. It is also possible to put the exhaust duct through the gable end of the home. In both instances a suitable vent cover should be used to prevent animals entering the duct and help prevent any wind blowing back into the exhaust. Ensure the exhaust is on a slight decline or insulate the exhaust if not insulated .
2, Push dry air to several points whether bedrooms or bathrooms with ducting. These are usually the worst affected rooms such as spare bedroom or bathroom. Use Y-connectors to increase the number of outlets. Blowing dry air into these rooms may feel draughty only if the air stream is in contact with human skin. Outlet grills should avoid these areas and be position in corners for instance.
3, Damp air from the home can be taken from one central point. Usually, this is on the landing area at the top of the stairs. Moisture in the home will migrate upwards from the lower floor/s. The convection current in the home means damp air rises. Drying homes on one floor may need additional fans to circulate the air or more than one dehumidifier if a larger home. Separate consideration is needed for basements, crawl spaces, attics, conservatories and garages.
4, Leave doors slightly ajar to promote air flow around the rooms
5, A humidistat is built into the EPD50 / DH1200. However, when ducting is fitted to the dehumidifier, it may be necessary to use an external humidistat such as EPHUM24DF which fits in seconds. This humidistat can be placed ideally on the top of the stairs or next to the home heating controls for more accurate monitoring of the air and improves dehumidifier reaction time if that is key.
6, The filter of the dehumidifier will need to be cleaned periodically. To avoid having to go into the attic or ceiling void to clean the filter, consider adding a suitable filter grill to the inlet that includes a dust filter built in. These can then be periodically cleaned rather than the air filter on the dehumidifier itself. That filter can be removed provided they are of comparable filter material which is reticulated foam.
7, On longer duct runs, consider using wider than prescribed to increase air flow to maintain the level of airflow. See below.
8, A power supply to the dehumidifier should be from the mains supply. Although, the maximum power consumption is only 500-550 Watts, power should not be taken from the any lighting circuit. Consult a qualified electrician.
9, Set the RH (Relative Humidity) control to a low (10%) for typically 2-3 weeks. It will work continuously. After the humidity in the home is under control, increase the RH level to a higher level that is right for your home typically 60-65%. In that way the dehumidifier will switch on when needed. Times can be added but we do not recommend. Read More
10, Remember to periodically clean the inlet grill filter

[@yutianabroad]

I am very interested in this product. Where can I buy it in Ireland? Can it control humidity in different zones? Because I need to set an individual vent in each bedroom. Also, who do I need to reach out for with the installation? Thanks!

[@MrMarketboy]

How much does a system like this cost to supply and install?

[@uptwisting]

I have an incredibly similar situation in a tiny bungalow, with four rooms coming off the hallway (five if you count the room off the lounge), including an (currently) unheated kitchen. I am very concerned about the humidity in the home, which on the baby monitor shows 88%! Though mould is only in the unheated room (kitchen).
This system seems quite appropriate for me, especially as I'm struggling with condensation in the kitchen and I was going to install an extractor fan but this may sort everything out. My only concern is where to install the dry push vents and whether you reduce the size of the push air vent, or should it be 5" duct, as condensation issues are really only limited to the winter and windows?

[@johnwilliamson9335]

Super interesting video and product. One thing that confuses me is that the exhaust outlet length looks to be way over the 1000mm specified in the DH1200 user manual. Is this acceptable because it is going downhill and gravity will take affect or is there another explanation?

[@johnwilliamson9335]

Would also be interested to know what the floor square meterage was for this bungalow fed by a single unit?

[@EcorProBVUithoorn]

That is a great question. The ducting was straight and smooth and there was adequate air flow in this case. The issue generally comes the bends in the ducts causing resistance so its quoted as a rule of thumb. We could have used wider ducting to reduce the back pressure on the exhaust also for longer runs or even left the duct off completely.
That may sound odd but the attic space had a very good air flow from outside so any moisture transported to the attic space would have been naturally vented away at the soffit vents. In that scenario you get the most efficient drying system with zero resistance on the exhaust vent.

[@EcorProBVUithoorn]

There is no hard and fast rules on this. Factors of proximity to water (general humidity), number of occupants etc need to be considered. A big source of water in this instance was the cooking (only an internal carbon fitter on the cooker rather than vent to he outside) and the bathroom extractor that was only on for a very short time when the light was on in the bathroom.
That meant the cooking and bathing moisture was locked into the home and could not escape easily. Also there were large windows acting effectively as large dehumidifiers but made them unsightly with a lot of condensation forming. The bedroom windows were not the only cool surface. The back of the home had a conservatory between bathroom and kitchen that attracted the water.
Overall the home benefitted from a less "heavy" feeling and felt "warmer". The condensation on windows did appear when there were overnight guests in the home in winter and that was simply due to more water being present in the air.
The overall size of the bungalow was around 140 sqm but if more occupant were in the home a larger or second unit would need to be considered perhaps for the conservatory area alone.

[@johnwilliamson9335]

@@EcorProBVUithoorn Thanks for the reply. Installed this 2 days ago in a very old damp house. Really looking forward to see the humidity data. Left it on lowest humidity setting and will return in a week to see the results

[@Randomz1985]

@@johnwilliamson9335did you find that it works well?

[@kmain0]

do people just tie this into the existing HVAC system using the existing duct work?

[@EcorProBVUithoorn]

Because fan speeds probably don't match i.e. the air flow from HVAC is probably much greater than the. DryFan unit so the HVAC is restricted lowering performance.. however they could run in parallel. Care would need to be taken that was no back pressure.