Daikin EWWD320, Installation, Operation And Maintenance Manual

Page: 14 / 52

D-EIMWC00908-16EN - 14/52
Water treatment
Before putting the machine into operation, clean the water circuit. Dirt, scale, corrosion residue and other foreign material
can accumulate inside the heat exchanger and reduce its heat exchanging capacity. Pressure drop can increase as well,
thus reducing water flow. Proper water treatment therefore reduces the risk of corrosion, erosion, scaling, etc. The most
appropriate water treatment must be determined locally, according to the type of system and local characteristics of the
process water.
The manufacturer is not responsible for damage to or malfunctioning of equipment caused by failure to treat water or by
improperly treated water.
Figure 3 - Water piping connection for evaporator and condenser
Legend translation
Gauge
Gauge
Flexible connector Flexible connector
Flow switch Flow switch
Thermometer Thermometer
Isolating valve Isolating valve
Pump Pump
Filter Filter
Table 1 - Acceptable water quality limits
pH (25°C)
6,8

8,0
Total Hardness (mg CaCO
3
/ l)

200
Electrical conductivity

S/cm (25°C)

800
Iron (mg Fe / l)

1.0
Chloride ion (mg Cl
-
/ l)

200
Sulphide ion (mg S
2 -
/ l) None
Sulphate ion (mg SO
2
4
-
/ l)

200
Ammonium ion (mg NH
4
+
/ l)

1.0
Alkalinity (mg CaCO
3
/ l)

100
Silica (mg SiO
2
/ l)

50
Evaporator exchangers anti-freeze protection
ATTENTION
Neither the evaporator nor the condenser is self-draining and it has no heater installed. Both heat exchangers
must be protected against freezing