EN - 7
NLC_A COD: 1606.4037360_00
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.
SYSTEM DRAINING
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
possible solutions:
1. Completely drain the water
from the
appliance.
2. Operation with glycol water
, with a glycol
percentage chosen on the basis of the
minimum external temperature envisaged.
3. Use of heaters.
In this case the heaters must always be
powered for the entire winter period (machine
in standby).
NLC 0750 A
1
2
2
5
6
7
7
8
8
9
10
11
12
13
3
3
4
Water Tank
3
7.
MAIN HYDRAULIC CIRCUITS
COMPONENTS SUPPLIED AS STANDARD
1 Plate heat exchanger
2 Water temperature sensor (IN/OUT)
3 Air drain valve
10 Water drain cock
RECOMMENDED / OBLIGATORY COMPONENTS (NOT SUPPLIED) THAT ARE THE RESPONSIBILITY OF THE
INSTALLER
3 Air drain valve
4 Pump
5 Safety valve (obligatory)
6 Water filter (obligatory)
7 Anti-vibration joints
8 Pressure gauge
9 Flow switch (obligatory)
10 Water drain cock
11 Expansion tank
12 Electric heater
13 Shut-off valve
WARNING
Obligatory components (NOT SUPPLIED)
that are the responsibility of the installer
• WATER FILTER
The
water filter
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
at least the diameter of
the units fittings.
• FLOW SWITCH
The
flow switch
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
calibrated
at 50% of the nominal capacity
Aermec will not be responsible for any
damage to the heat exchanger if there is no
water filter and flow switch
Vers.
U.M.
750
Minimum water content
A
l/kW
4
Minimum water content for process applications or operation with low outdoor temperatures and low load.
Outlet water temperature adjustment. Design ∆t less than 5°C / 41°F.
A
l/kW
8
Minimum water content
A
gal/ton
3,19
Minimum water content for process applications or operation with low outdoor temperatures and low load.
Outlet water temperature adjustment. Design ∆t less than 5°C / 41°F.
A
gal/ton
6,39
Water features
System: Chiller with plate heat exchanger
PH
7,5-9
Electric conductivity
100-500μS/cm
Total hardness
4,5-8,5 dH
Temperature
< 65°C
< 149°F
Oxygen content
< 0,1 ppm
Max. glycol amount
0,5
Phosphates (PO4)
< 2ppm
Manganese (Mn)
< 0,05 ppm
Iron (Fe)
< 0,3 ppm
Alkalinity (HCO3)
70 - 300 ppm
Chloride ions (Cl-)
< 50 ppm
Sulphate ions (SO4)
< 50 ppm
Sulphide ion (S)
none
Ammonium ions (NH4)
none
Silica (SiO2)
< 30ppm
NLC 0750 A
