NDE Pool MASTER PLUS NDE-08-DCP User And Service Manual page 10

3.3 Distance from your swimming pool
The heat pump is normally installed within a perimeter area extending 7.5 m from the
swimming pool. The greater the distance from the pool, the greater the heat loss in the pipes.
As the pipes are mostly underground, the heat loss is low for distances up to 30 m (15 m from
and to the pump; 30 m in total) unless the ground is wet or the groundwater level is high. A
rough estimate of the heat loss per 30 m is 0.6 kWh (2,000 BTU) for every 5 ºC difference
between the water temperature in the pool and the temperature of the soil surrounding the
pipe. This increases the operating time by 3% to 5%.
3.4 Check-valve installation
Note: If automatic dosing equipment for chlorine and acidity (pH) is used, it is essential to
protect the heat pump against excessively high chemical concentrations which may corrode
the heat exchanger. For this reason, equipment of this sort must always be fitted in the piping
on the downstream side of the heat pump, and it is recommended to install a check-valve to
prevent reverse flow in the absence of water circulation.
Damage to the heat pump caused by failure to observe this instruction is not covered by the
warranty.
3.5 Typical arrangement
Note: This arrangement is only an illustrative example.
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