D-EIMAC00907-16EN - 11/20
Sound protection
When sound levels require special control, great care must be
exercised to isolate the unit from its base by appropriately
applying anti-vibration elements (supplied as an option).
Flexible joints must be installed on the water connections, as
well.
Water piping
Piping must be designed with the lowest number of elbows
and the lowest number of vertical changes of direction. In this
way, installation costs are reduced considerably and system
performance is improved.
The water system must have:
1. Anti-vibration mountings in order to reduce transmission of
vibrations to the structures.
2. Isolating valves to isolate the unit from the water system
during maintenance.
3. Flow switch, in order to protect the chiller must be
protected against freezing by continuous monitoring of the
water flow in the evaporator. In most cases, on-site the
flow switch is set to produce an alarm only when the water
pump switches OFF and the water flow fall to zero. it is
recommended to adjust the flow switch in order to produce
a “Water Loss Alarm” when the water flow reaches 50% of
the nominal value, in this case the evaporator is protected
against the freezing and the flow switch can detect the
water filter clogging.
4.
Manual or automatic air venting device at the system’s
highest point.; drain device at the system’s lowest point.
5. Neither the evaporator nor the heat recovery device must
be positioned at the system’s highest point.
6. A suitable device that can maintain the water system under
pressure (expansion tank, etc.).
7. Water temperature and pressure indicators to assist the
operator during service and maintenance.
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.
The water filter must be installed as close as
possible to the chiller
, as in Figs. 6 and 7. If the water
filter is installed in another part of the water system, the
Installer has to guarantee the cleaning of the water pipes
between the water filter and the evaporator.
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.
Water treatment
Before putting the unit into operation, clean the water circuit.
Any damage due to the presence of foreign bodies or debris in
the evaporator will not be covered by warranty. 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
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
Summary of Contents for EWAD TZ
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