Physical/ Chemical Properties Of Pool Water; Minimising Heat Loss; Siting And Installation - BWT M.P.I. 100M Notice D'installation Et Conseils D'utilisation

2.3

Physical/ chemical properties of pool water

Never start up the heat pump in winter if the pool water temperature has been allowed to fall to 5°C or below (do not
use the heat pump as a means to prevent the formation of ice on the surface of the pool).
Pool water treatment products currently available on the market are compatible with the materials used to manufacture
the heat pumps, it being assumed that the pool water's physical and chemical properties comply with the following
recommendations:
pH between 7 and 7.4
total hardness (TH) less than 190ppm
cyanuric acid content (stabiliser) less than 80 ppm
Concentration of free chlorine: 1.0 to 1.5 ppm
Concentration of free bromine: 1.0 to 1.5 ppm
These properties must be checked at the beginning of the season before allowing water to circulate through the heat
pump, and then at regular intervals throughout the season.
Caution:
Shock treatment (super chlorination) of the pool water: should it be necessary to carry out a shock treatment of the
pool water, isolate the hydraulic circuit (isolating valves) on which the heat pump is mounted before beginning to
increase the concentration of disinfectant, and wait until the concentration of disinfectant returns to normal levels
before re-opening these valves.
2.4

Minimising heat loss:

During the initial heating phase at the beginning of the season, cover the pool with an isothermal cover to limit heat
loss through water evaporation and thermal transfer between the pool water and the overlying air.
To render this phase as short as possible, the heat pump (and hence the filtration system) should be allowed to run
24 hours a day. After the initial heating phase, the pool should be left covered with an isothermal cover while the pool
is not in use, especially when the ambient temperature is cool (night, etc.).
3.

SITING AND INSTALLATION

BWT heat pumps must be installed outside at a distance of at least 3.5m from the pool in order to comply with the
standard C 15-100.
We recommend that the heat pump be installed on a support on the ground next to the pool plant room. The installation
site should meet the following criteria:
• easy accessibility around the machine to facilitate maintenance and cleaning;
• the heat pump is not directly exposed to prevailing winds, this is to limit splashing of the machine with water
in the event of precipitation. If necessary, install deflectors to protect the machine against this phenomenon
taking care not to obstruct the circulation of air into or out of the heat pump (minimum distances, see page
33).
BWT heat pumps draw ambient air in through the evaporator and expel air out through the fan grill(s).
The nominal air flow rates are as follows:
M.P.I.-100M
Number of fans
Ait flow rate m³/h *
32/96
2020/11 - Indice de révision : I - Code : 33340
M.P.I.-160M M.P.I.-190M
1 1
2100 3300
M.P.I.-190T M.P.I.-240M
2 2 2
6000
M.P.I.-240T M.P.I.-320T
2 2
6000 8400
CHAUFFAGE & DÉSHUMIDIFICATION
M.P.I.-380T
2
8400