Daikin EWAD-D-S Series Installation, Operation And Maintenance Manual page 16

11. In the event that glycol is added to the water system as
anti-freeze protection, pay attention to the fact that suction
pressure will be lower, the unit's performance will be lower
and water pressure drops will be greater. All unit-protection
Water treatment
Before putting the unit into operation, clean the water circuit.
Dirt, scales, corrosion debrits and other other 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
pH (25°C)
Electrical conductivity S/cm (25°C)
-
Chloride ion (mg Cl / l)
Sulphate ion (mg SO
Alkalinity (mg CaCO
3
Figure 5 - Water piping connection for evaporator
1. Pressure Gauge
2. Flexible connector
3. Flow switch
4. Temperature probe
Figure 6 - Water piping connection for heat recovery exchangers
1. Pressure Gauge
2. Flexible connector
3. Temperature probe
Table 1 - Acceptable water quality limits
6,88,0
800
200
2 - 200
/ l)
4
100
/ l)
systems, such as anti-freeze, and low-pressure protection
will need to be readjusted.
12. Before insulating water piping, check that there are no
leaks.
5. Isolation Valve
6. Pump
7. Filter
4. Isolation Valve
5. Pump
6. Filter
the risk of corrosion, erosion, scaling, etc. The most
appropriate water treatment must be determined locally,
according to the type of system and water characteristics.
The manufacturer is not responsible for damage to or
malfunctioning of equipment caused by failure to treat water or
by improperly treated water.
Total Hardness (mg CaCO
Iron (mg Fe / l)
2 -
Sulphide ion (mg S / l)
Ammonium ion (mg NH
Silica (mg SiO / l)
2
D-EIMAC00208-16EU - 16/192
 200
/ l)
3
 1.0
None
+  1.0
/ l)
4
 50