Daikin EWAQ-E, Installation, Operation And Maintenance Manual

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Figure 5 - Water piping connection for evaporator
1. Pressure Gauge
2. Flexible connector
3. Flow switch
4. Temperature probe
5. Isolation Valve
6. Pump
7. Filter
Figure 6 - Water piping connection for heat recovery exchangers
1. Pressure Gauge
2. Flexible connector
3. Temperature probe
4. Isolation Valve
5. Pump
6. Filter
Water treatment
Before putting the unit into operation, clean the water circuit.
Dirt, scales, corrosion debrits and 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
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.
Table 1 - Acceptable water quality limits
pH (25°C)
6,8
÷
8,0
Total Hardness (mg CaCO
3
/ l)
<
200
Electrical conductivity
µ
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