Daikin EWAD-TZ Manual Del Usuario página 16

8. A filter or device that can remove particles from the fluid. The use of a filter extends the life of the evaporator and pump and helps to
keep the water system in a better condition.
9. Evaporator has an electrical resistance with a thermostat that ensures protection against water freezing at ambient temperatures as
low as –25°C.
All the other water piping/devices outside the unit must therefore be protected against freezing.
10. The heat recovery device must be emptied of water during the winter season, unless an ethylene glycol mixture in appropriate
percentage is added to the water circuit.
11. If case of unit substitution, the entire water system must be emptied and cleaned before the new unit is installed. Regular tests and
proper chemical treatment of water are recommended before starting up the new unit.
12. 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 systems, such as anti-freeze,
and low-pressure protection will need to be readjusted.
13. Before insulating water piping, check that there are no leaks.
Figure 7 - Water piping connection for evaporator
Figure 8 - Water piping connection for heat recovery exchangers
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
Table 1 - Acceptable water quality limits
pH (25°C)
Electrical conductivity µS/cm (25°C)
-
Chloride ion (mg Cl
Sulphate ion (mg SO
Alkalinity (mg CaCO
1. Pressure Gauge
2. Flexible connector
3. Flow switch
4. Temperature probe
1. Pressure Gauge
2. Flexible connector
3. Temperature probe
6,8÷8,0
<800
<200
/ l)
2 - <200
/ l)
4
<100
/ l)
3
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-EIMAC00904-14EU - 16/229
< 200
/ l)
3
< 1.0
None
+ < 1.0
/ l)
4
< 50