Thermodynamic Defrosting Cycle; Periodic Maintenance - BWT 100M Montage- Und Bedienungsanleitung

7.7

Thermodynamic defrosting cycle

As the air passes over the evaporator fins, the water it contains condenses out in fine droplets (see paragraph I page
27).
If the ambient air is cold, these droplets could freeze and so would no longer be able to drain by gravity to
the bottom of the machine.
The frost would then slowly accumulate on the fins, creating an insulating later that would prevent
heat calories transferring from the air to the heat transfer fluid.
The heat pumps is fitted with a device that automatically detects the excessive accumulation of frost, and
triggers defrosting by cycle inversion (see paragraph I for more information).
The defrosting phase lasts for a few minutes. The heat pump then reverts to normal operation and another
defrosting phase may be triggered if necessary.
An audible click (movement of the 4-way valve) accompanies the start and end of the cycle inversion.
Nota bene:
• The more humid the air, the faster the frost will accumulate.
• Traces of residual frost may persist, however repeated defrosting cycles should not cause these
patches to grow bigger.
• Thermodynamic defrosting only runs correctly at an ambient temperature down to -7°C. Below
this temperature the machine should be switched off.
• While the weather is cold and wet, the heat pump could engage in successive defrosting cycles. The
time dedicated to defrosting is time taken from heating the pool, thus the calorific power delivered by the
machine is reduceed.
• The speed and efficiency of the defrosting phase are directly dependant on the pool water temperature.
7.8

Periodic maintenance

1.
Check regularly that dirt has not accumulated on the evaporator (pollen, earth, grass cuttings,
insects, etc.)
Clean it if necessary:
• stop and disconnect the machine,
• rinse it down gently with water (do not use a high pressure hose, this could damage the fins)
• use a soft brush to clean between the fins
2.
Depending on how quickly dirt builds up on the evaporator, have the floor of the machine cleaned regularly
by a professional to prevent obstruction or blocking of the condensate flow.
3.
Check periodically that the impeller blades are not dirty or damaged.
4.
Have the pressure of the heat transfer fluid and the electrical connections checked annually by a
professional.
5.
Clean the cabinet housing the machine
Clean the casing using soapy water and a soft cloth. Never use abrasive products or organic solvants.
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2020/11 - Indice de révision : I - Code : 33340 CHAUFFAGE & DÉSHUMIDIFICATION