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The water quality must be in accordance with the specifications listed the table below
DAE Water quality requirements
Ph (25 °C)
Electrical conductivity [μS/cm] (25°C)
Chloride ion [mg Cl- / l]
Sulphate ion [mg SO42- / l]
Alkalinity [mg CaCO3 / l]
Total Hardness [mg CaCO3 / l]
Iron [mg Fe / l]
Ammonium ion [mg NH4+ / l]
Silica [mg SiO2 / l]
Chlorine molecular (mg Cl2/l)
1: HP = Heat pump;
2: CO = Cooling only
The water pressure should not exceed the maximum working pressure of 10 bar.
Provide adequate safeguards in the water circuit to make sure that the water pressure will never
exceed the maximum allowable working pressure.
5.7
Evaporator and recovery exchangers anti-freeze protection
All BPHE are supplied with a thermostatically controlled anti-freeze electrical resistance, which provides adequate anti-
freeze protection at temperatures as low as -18°C.
However, unless the heat exchangers are completely empty and cleaned with anti-freeze solution, additional methods
should also be used against freezing.
The following protection methods must be considered when designing the system as a whole:
−
continuous water flow circulation inside piping and exchangers;
−
addition of an appropriate amount of glycol inside the water circuit or, as alternative, an additional heat insulation and
heating of exposed piping (internal and external to the unit);
−
if the unit does not work during the winter season, emptying and cleaning of the heat exchanger.
It is the responsibility of the installer and/or of local maintenance personnel to ensure that described anti -freeze
methods are used. Make sure that appropriate anti-freeze protection is always maintained. Failing to follow the
instructions above could result in unit damage.
Damage caused by freezing is excluded from the warranty, therefore Daikin Applied Europe S.p.A
declines all responsibility
D-EIMWC01008-16_03EN - 20/35
Table 1 - Acceptable water quality limits
Shell&tube+
BPHE
Flooded
7.5 – 9.0
6.8 ÷ 8.4
< 800
< 500
< 70 (HP
< 150
< 300 (CO
< 100
< 100
< 100
< 200
< 200
75 ÷ 150
< 1
< 0.2
< 1
< 0.5
< 50
NO
< 5
< 0.5
1
);
2
)
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