Table of Contents
Advertisement
4. Water
connections
4.1
Connection diagram
4.2
Position of connections
4.3
Hydraulic data
4.4
Connection to the system
4.5
System fill-up
4.6
Desuperheater connection
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)
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.
12
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:
For cooling only version only
M > 9,45 x k x n/N x (Qf – q)
For heat pump version only
M > 9,45 x k x n/N x (Qt – q) + 2,37 x (Qt – 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 = Partition coefficient (n=1 unit up to 4 compressors; n=2 units with more
than 4 compressors);
N = N. compressors;
Qf = Cooling capacity (kW);
Qt = Heating capacity (kW);
q = Permanent thermal load in the system (kW), (q=0 if the value is unknown).
ΔT (K)
3
4
5
6
7
8
9
10
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).
If the water volume in the circuit (V) does not reach what is indicated, installing a new inertial
storage tanks shall be required.
Storage size shall be calculated so that with its volume, added to the water quantity inside the
circuit, the value indicated in the formula is reached.
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.
Content
K
1
1
1
1.05
1.1
1.15
1.2
1.25
Material
Concentration mg/l or ppm
AISI 316L Copper
Advertisement
Table of Contents
