13
4.1
Connection diagram
1
Unit
ANT
Anti-vibration joint (recommended)
CV
Check valve
FL
Flow switch (mandatory)
FTR
Mesh filter (mandatory)
MN
Water gauge
MP
Circulating pump
RI
Shut-off ball valve
RIC
Automatic water filling valve
SFA
Automatic air vent (mandatory)
ST
Inertial tank
VE
Expansion vessel
VSI
Safety valve (mandatory)
User side
Source side
Some of the components in the diagram may already be included in the unit with the
hydronic kit. Those not included must be provided by the installer.
Connection pipes must have a suitable diameter and be supported so as not to impose
their weight on the unit.
4.2
Position of connections
The position of the water connections and the inlet and outlet direction is indicated by the labels
on the connections.
4.3
Hydraulic data
4.3.1
Water volume
The machine electronic control, to protect the electrical motor, limits hourly start up of the
compressor.
This operation creates oscillations of the water temperature in the draw-off point, affecting plant
efficiency.
For a correct operation, the water volume must comply with the following formula:
M > 9,45 x k x n/N x (Qf - q)
M = Minimum water content (l);
k = Factor that takes into account the different water temperature value
between the inlet and outlet of the evaporator or condenser;
n = Coefficient of capacity control (n = 1 unit up to 4 compressors; n = 2 units
with more than 4 compressors);
N = N. compressors;
Qf = Cooling capacity and heating capacity (kW);
q = Permanent thermal load in the system (kW), (q = 0 if the value is
unknown).
ΔT
(K)
K
3
1
4
1
5
1
6
1.05
7
1.1
8
1.15
9
1.2
10
1.25
For the process application a 50% higher water content is recommended to stabilize the
outlet temperature (1.5 x M calculated with the previous formulas).
4.3.2
Water features
Water features are important for the proper operation of the machine and for its lifetime.
Extreme water hardness leads to the formation of limestone in exchangers reducing their
performance.
The table shows some water parameters to be observed for proper operation of the machine.
4.
Water
connections
4.1
Connection diagram
4.2
Position of connections
4.3
Hydraulic data
4.4
Connection to the system
4.5
PV3E evaporation control
4.6
PV3C cold start
Content
Concentration mg/l or ppm
Material
AISI 316L
Copper
pH
<6
2
2
6-7.5
2
2
7.5-9
1
1
>9
1
2
Alkalinity
HCO3
- <70
1
2
70-300
1
1
>300
1
2
Sulphate
SO42-
<70
1
1
70-300
1
3
>300
1
3
Alkalinity/Sulphate
HCO3-/SO42-
>1
1
1
<1
1
3
