What is the Defrost Cycle?

During winter months several heat pumps should go through a “defrost cycle” procedure. Often this has not been explained correctly before install, which results in lots of confusion that the heat-pump is not functioning.

What’s a defrost cycle is?
In heating mode a heat pump extracts heat from the outdoor air and transfers it inside your premises to warm it. When the ambient temperature exterior gets quite cold (close to 0°C or under) the moisture in the air freezes on the out-door unit’s heat-exchanger as the fan blows the air across it. A defrost cycle is merely the method automatically fixing this and recognising that ice begun or has shaped to form.

Why does my device have to do a cycle?
Any ice building on the outside heat exchanger reduces the air flow across it, that will effect the efficiency, occasionally reducing it dramatically. In extreme cases this can also result in harm to the outdoor unit.

How do you tell if my unit is in a cycle?
Indoors you’ll find the unit will stop heating system, the indoor fan will halt and according to the version there will generally be some kind of visual indicator like a light on the unit (usually the “run” light) will blink continuously. Outside, the outdoor fan will even have quit and the compressor will likely be running.

How frequently will my device go into defrost mode?
There certainly are a number of factors that affect how often a unit will go directly into defrost mode. Some of these include:

  • The outside temperature and humidity
  • The quantity of heating load the the machine is attempting to produce
  • The status of the warmth pump system.

There are created into the computer management of the unit that restrict how commonly defrosting can happen. After establishing before completing its defrost, normally a unit should run for a minimum of around 3-5 minutes. From there defrosts should happen no more frequently than about every 35 minutes.

Once my device is defrosting extended will it take?
Either of two variables can deliver the the machine out of a cycle. Primarily, if the detectors on the outdoor unit detect that it’s heat exchanger temperature has grown enough, defrosting will stop. Secondly, if the detectors don’t discontinue it ahead, the most time a unit will be in cycle is around 10 minutes.

It’s vital not to discontinue the unit before the defrost cycle has ended, because in the event the device is re-started soon afterward it might result in harm to itself and will run quite inefficiently.

My device is defrosting often / not providing heat – What could be wrong?
A deficiency of heat, or regular defrosting could be caused by several factors.

In the event the unit has worked like this because it was initially installed (first chilly snap), you may be working it wrong or it can be under-sized for the space it’s attempting to warm. You should talk your documentation to make certain the unit are operating right. If this doesn’t repair the problem you ought to talk your installer or a different heat-pump installer that is reputable. They can help one to ensure correct operation, and right sizing.

If the the system is undersized for the room it’s not flawed. The duty for right sizing the unit initially rests with the installing firm – they will need to redress the situation if the unit is too little.

A recently produced difficulty might be an indicator of a fault or care required. It is possible to perform some basic care yourself by ensuring that your outdoor unit is clear of foliage, and cleaning the filters in your indoor unit and also the heat exchanger just isn’t blocked. When it doesn’t redress the problem you ought to talk another reputable heat pump installer or your installer.

Is there any way I could help to reduce defrosting?
There definitely is. Keep your device well preserved (as above) and ensure you’re operating it accurately. This may assist a good deal.

Needless to say the less load you place on the the machine the less often it will need to defrost in chilly conditions. Ultimately long-lasting fixes for example installing insulation in ceilings, walls and under floors may reduce your heating requirement (and ultimately save you money). More immediately, keeping doors closed and curtains drawn will also help cut back your heat needed.