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FAQ

Questions

  1. What is the right unit for my house?
  2. Can I install the ventilation system myself?
  3. What are the benefits of a rotating heat exchanger?
  4. Why should I insulate the waste air duct?
  5. How I should insulate the waste air duct?
  6. What do I have to keep in mind if I also want cooling from my air handling unit?
  7. What kind of regular maintenance does an Enervent unit need?
  8. Can the Enervent unit be attached to a home automation system?
  9. The heat exchanger is very efficient, so is an heating coil needed at all?
  10. Which type of supply air heater is the better choice?
  11. What is the air flow range of Enervent air handling units?
  12. When should I replace my filters?
  13. Can I wash my filters?
  14. Where can I install my Enervent unit?
  15. How much noise does the air handling unit create?
  16. Can I install a cooling coil afterwards?
  17. What is air flow adjustment?
  18. Can the water heating coil freeze?
  19. Should I install dampers in my air ducts?
  20. How long has Ensto Enervent produced air handling equipment?
  21. Should I reduce my air flows when it is cold outside?
  22. Does the rotating heat exchanger return moisture and can my indoor humidity level get too high?

Answers

1. What is the right unit for my house?

We recommend that you let a trained professional choose the right air handling unit for your house.

2. Can I install the ventilation system myself?

We recommend that your ventilation system be installed by a professional. Proper installation requires special tools and know-how.

3. What are the benefits of a rotating heat exchanger?

A rotating heat exchanger has a much higher heat exchanging capability than a traditional plate heat exchanger. This is due to the fact that the rotating heat exchanger has significantly more mass and heat exchanging surface than a traditional heat exchanger. Mass increases the heat storing capability. An investment in a rotating heat exchanger pays itself back quickly as you save on your heating bill.

4. Why should I insulate the waste air duct?

The rotating heat exchanger is very efficient and waste air (air flowing out of the house) can be very cold. This might cause moisture to build on the waste air duct, if the duct runs through a warm area.

5. How I should insulate the waste air duct?

If the waste air duct runs through a warm area, a proper insulation is either A. 80 millimeters of insulation with a water vapor proof outer coating or B. 20 millimeters of closed cell insulation (such as Armaflex) directly on the duct and 50 millimeters of insulation with a water vapor proof outer coating. If the duct runs through a cold area, the insulation should be at least 100 millimeters thick. Please read the installation instructions carefully before installing your ventilation ducts.

6. What do I have to keep in mind if I also want cooling from my air handling unit?

Duct insulation should be well-planned. The ducts can gather moisture and cause problems if not well-insulated.

7. What kind of regular maintenance does an Enervent unit need?

The air filters must be changed according to the change frequency of the filters. The unit itself should also be cleaned periodically with a vacuum cleaner or such.

8. Can the Enervent unit be attached to a home automation system?

Units with the Enervent EDA control can be attached to a LAN or Ethernet network with the FreeWay gateway unit. Units with Enervent EC control can be also be attached to most home automation systems.

9. The heat exchanger is very efficient, so is an heating coil needed at all?

The heat exchanger does not need a pre heater due to its great heat efficiency. Supply air heating after the heat exchanger is needed in some cases depending on the climate conditions where the unit is installed. Usually we recommend a supply air heater, so that supply air is always nice and warm even during the coldest days.

10. Which type of supply air heater is the better choice?

Enervent air handling units have very efficient heat exchangers, so the supply air heater is only needed for the few coldest days. In relatively warm climates, such as in Southern Finland, the water circulated heating coil is usually not the cheapest option due to the high installation costs and low usage annually. The electric supply air heating coil is the better choice in these conditions. Supply air heating is more needed in colder climates and then the water heating coil is generally the better option.

11. What is the air flow range of Enervent air handling units?

The Enervent Family series has units with an air flow from 15 liters/second to 390 liters/second. The Pro series has bigger units, with air flows from 50 l/s to 7000 l/s.

12. When should I replace my filters?

The air filters in your Enervent unit need to be replaced on a regular basis. Panel filters should be changed every four months, bag filters every six months. Keep your air fresh, remember to change your filters!

13. Can I wash my filters?

You can't wash your filters, but you can extend the life of your filters by vacuuming them.

14. Where can I install my Enervent unit?

The Pingvin, Pandion, Pelican and Pegasos units must be installed in a warm space (over +5 °C). The LTR-3, LTR-6 and LTR-7 units can be ordered with an additional insulation with which they can be installed in a cold surrounding.

15. How much noise does the air handling unit create?

A correctly designed and dimensioned air handling unit is quiet.

16. Can I install a cooling coil afterwards?

Yes, just make sure that the supply air duct is insulated according to the insulation specification for cool air.

17. What is air flow adjustment?

The air flow of each air supply valve has to be adjusted to the exact design value. This process requires measuring equipment and it should always be done by a professional.

18. Can the water heating coil freeze?

The control of each Enervent unit with a water heating coil contains freeze protection. Enervent recommends the use of a spring-close air damper in the outside air duct in all units with water-circulated coils.

19. Should I install dampers in my air ducts?

It is always recommendable to use dampers in outside and exhaust air ducts. If there are water-circulated coils in the supply air, it is necessary to use spring-close air dampers in the outside air duct to prevent cold air from entering the unit in power loss situations.

20. How long has Ensto Enervent produced air handling equipment?

Ensto Enervent has been in the business from 1983.

21. Should I reduce my air flows when it is cold outside?

No. You should absolutely run your air handling unit at the same speeds which your air handling installer has recommended through-out the whole year. If you decrease your air flows during cold weather you increase the risk of ice build-up in your air handling unit. This risk in increased during extreme freezing outdoor conditions and with high indoor humidity (extensive shower use and lots of drying laundry).

The condition of your filters is essential to how well your air handling works. Dirty filters obstruct air flow and reduce air flows radically. Please be sure to change your filters regularly. Panel filters should be changed every 3-4 months and bag filters every 6 months. It is also useful to check that your outdoor air grill is clear from snow and tree leafs.

22. Does the rotating heat exchanger return moisture and can my indoor humidity level get too high?

The standard rotating heat exchanger found in all Enervent's product transfers some of the moisture in the exhaust air to the fresh outdoor air only when the outdoor temperature is below freezing. Often this is a desired feature as indoor humidity can be too dry when it's cold outside. When the air flows are properly dimensioned for your house, indoor humidity will not get too high. If the moisture load is high due to extensive shower use or laundry drying, you might want to make sure that the humidity boost feature (standard in ED models, optional for EC models) is activated.

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