Water Connections; Connection To The System; Hydraulic Circuit Content; Protection Against Corrosion - Hitecsa EWNLM 115 Manuel D'utilisation

II.5

WATER CONNECTIONS

II.5.1

CONNECTION TO THE SYSTEM

IMPORTANT!
The layout of the hydraulic system and connection
of the system to the unit must be carried out in
conformity with local and national rules in force.
IMPORTANT!
It is advisable to install intercept valves that isolate
the unit from the rest of the system. It is also
advisable to install elastic connection joints.
Mesh filters with a square section (longest side =
0.8 mm), of a suitable size and pressure drop for the
system, must be installed. Clean the filter from time
to time.
Once the connections to the unit are made, check that none of the
pipes leak, and bleed the air from the system. The water flow rate
through the heat exchanger must not drop below the value
corresponding with the temperature change of 8°C (with both
compressors on where present or 1 compressor).
in the case of models without pump, he pump must be installed with the
pressing delivery towards the water input to the machine.
It is recommended to mount the air bleed valve.
II.5.2

HYDRAULIC CIRCUIT CONTENT

II.5.2.1 Minimum contents of water circuit
The electronic control equipped with the AdaptiveFunction Plus makes
it possible to reduce the amount of water in the system. For proper
operation of the unit, a minimum amount of water must be ensured in
the water system.
Model
Minimum content with
adaptivefunction plus
Model
Minimum content with
adaptivefunction plus
Refer to the maximum power that can be envisioned (also in heating
mode if EWNHM). A specific capacity of 2l/kW. is considered as
indicated in the documentation If the amount of water in the system is
less than the indicated amount, it is necessary to install an additional
storage tank.
II.5.2.2 Maximum contents of water circuit
The P1/P2 units are equipped with an expansion tank and safety valve
that limits the maximum amount of water contained in the system.
Maximum contents
Water
Mixture with ethylene glycol at 10%
Mixture with ethylene glycol at 20%
Mixture with ethylene glycol at 30%
Maximum contents Water
Mixture with ethylene glycol at 10%
Mixture with ethylene glycol at 20%
Mixture with ethylene glycol at 30%
If the water content exceeds the values indicated, an additional
expansion tank must be added.
Expansion tank
Capacity
Pre-loading
Expansion tank maximum pressure
Calibration
115 118 122
l 31,2 37,0 45,7
125 230 240
l 52,7 61,2 83,8
115 118 122
l 243 243 243
l
212 212 212
l
196 196 196
l
182 182 182
l 125 230 240
243 243 243
l
212 212 212
l
196 196 196
l
182 182 182
115÷240
l 7
barg 1
barg 3
barg 3
SECTION II: INSTALLATION AND MAINTENANCE
Model
Expansion tank
Safety valve calibration
Maximum admissible pressure
Water connection dimensions
Load connection dimensions (whole)
Model
Expansion tank
Safety valve calibration
Maximum admissible pressure
Water connection dimensions
Load connection dimensions (whole)
II.5.3

PROTECTION AGAINST CORROSION

Do not use corrosive water containing deposits or debris in the
hydraulic circuits who insist on unity; below is the corrosion range:
pH
SO4--
HCO3-/SO4--
Total hardness
CI-
PO43-
NH3
Fe+++
Mn++
CO
2
H S
2
Temperature
Oxygen content
Alkalinity (HCO
Electrical Conductivity
Nitrate (NO
3
The use of demineralized water containing chlorine or requires the
adoption of specific exchangers (indicated in the documentation where
available). If it is reasonably certain water quality within the table above,
or you are unsure about the presence of different materials that could
cause over time a gradual corrosion of the heat exchanger, it is
necessary to insert an intermediate heat exchanger inspection and in
material suitable to withstand these components or a heat exchanger
sacrificial. In water/water units, pit and aqueduct water must be used in
compliance with the laws in force in the country where the machines are
installed. Regarding the well water, if there is no risk of corrosion and
do not want to use an intermediate heat exchanger is necessary to
insert upstream of the exchanger a self-cleaning
microns.
II.5.3.1 Recommended installation
2
1
1
2
3
4
5
6
35
Hydraulic data
115
l 7
kPa 300
kPa 300
Ø
Ø
125
l 7
kPa 300
kPa 300
Ø
Ø
7.5 ÷ 9.0
< 70 ppm
> 1.0 ppm
4.0 ÷ 8.5
< 50 ppm
< 2.0
< 0.5
< 0.2
< 0.05
< 5
< 50 ppb
< 65
< 0.1 ppm
) 70 ÷ 300 ppm
3
10 ÷ 500 µS/cm
) < 100 ppm
filter with a mesh of 80
1
1
2
1
6
5
4
3
Cock
Water filter (KFA accessory)
Primary system water outlet
Primary system water inlet
Rejection device outlet
Rejection device inlet
118 122
7 7
300 300
300 300
1-½"GM
½"GF
230 240
7 7
300 300
300 300
1-½"GM
½"GF
dH
ppm
ppm
ppm
ppm
ppm
°C