EN - 9
NLC
NLC_HA/HE cod: 4037315_01
WARNING
The selection and installation of the components
outside the appliance is assigned, due to his
competence, to the installer who will have to
operate according to the rules of good practice
and in compliance with the regulations in force in
the country of destination.
The hydraulic piping for connection to the
appliance must be properly scaled for the actual
water flow rate required by the system when
operating. The water flow rate to the heat
exchanger must always be constant.
Clean the system carefully before connecting the
unit. This is done in order to eliminate possible
residues such as welding spatter, waste, rust
or any other impurity from the pipes. These
substances could deposit inside and cause the
appliance to malfunction. The connection pipes
must be properly supported so as not to burden
the appliance with their weight.
If the system is shut down during the winter, the
water in the heat exchanger could freeze, causing
irreparable damage to the exchanger itself.
To avoid the risk of freezing, there are three pos
-
sible solutions:
from the appli
-
ance.
, with a glycol per
-
centage chosen on the basis of the minimum
external temperature envisaged.
In this case the heaters must always be pow-
ered for the entire winter period (machine in
standby).
NLC_H 0280 ÷ 1250
1
2
2
5
6 7
7
8
8
9
10
11
12
13
3
Accumulo
Water Tank
4
4
1 Plate heat exchanger
2 Water temperature sensor (IN/OUT)
3 Air drain valve (standard for size NLC0550-1250)
4 Safety valve (standard for size NLC0550-1250)
3 Air drain valve (only for size NLC0280-0350)
4 Safety valve (only for size NLC0280-0350)
5 Pump
6 Water filter (obligatory)
7 Anti-vibration joints
8 Pressure gauge
9 Flow switch (obligatory)
10 Expansion tank
11 Loading group
12 Electric heater
13 Shut-off valve
WARNING
The allows any impurities in
the hydraulic circuits to be blocked and
eliminated; impurities that could reach the
heat exchanger and damage it.
It is ‘ OBLIGATORY to install the water filter
(not supplied) at a maximum of 1 m from the
cooling water inlet fitting.
The filter must have
The has the task of making sure
that water is circulating in the unit.
If this is not the case, it shuts down the unit.
The unit does not start if the flow switch is not
wired to the panel and should be
Characteriscs of the water
System: Chiller with plate heat exchanger
PH 7.5-9
Electrical conducvity 100-500μS/cm
Total hardness 4.5-8.5 dH
External air < 65°C
Oxygen content < 0.1 ppm
Maximum glycol content 0.5
Phosphates (PO4) < 2ppm
Manganese (Mn) < 0.05 ppm
Iron (Fe) < 0.3 ppm
Alkalinity (HCO3) 70 - 300 ppm
Chlorine ions (Cl-) < 50 ppm
Sulphate ions (SO4) < 50 ppm
Sulphide ion (S) none
Ammonium ions (NH4) none
Silica (SiO2) < 30ppm
Vers. U.M. 280 300 330 350 550 600 650 675 750 800 900 1000 1100 1250
Minimum water content
HA l/kW 4 4 4 4 4 4 4 4 4 4 4 4 4 4
Minimum water content for process applicaons or operaon with low outdoor temperatures and low
load.
Outlet water temperature adjustment. Design ∆t less than 5°C.
HA l/kW 8 8 8 8 8 8 8 8 8 8 8 8 8 8
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