Antifreeze Protection With Glycol Solution; Hydraulic Connection - CIAT aquaciat 2 LD Serie Handbuch

Antifreeze protection with glycol solution

The table and the curves below indicate the minimum percentages to be provided in the installation as a function of the freezing
point.
ATTENTION: the glycol concentration must protect the fluid to at least 5°C below the water outlet temperature expected at the
evaporator in order to permit the correct regulation of the evaporator minimum pressure regulator.
Concentration %
Ethylene glycol
°C
Propylene glycol
°C

Hydraulic connection

The hydraulic connection must be established in accordance
with the diagram supplied with the unit which indicates the
positions and dimensions of the water inlets and outlets at the
exchangers.
The following points must be observed during connection:
- Respect the water inlet and outlet connection directions
indicated on the unit.
- A dimensioning study must be performed in order to respect
the operating conditions (flows and pressure drops). The
diameter of the piping may therefore be different from that
envisaged at the exchanger.
- The piping must not transmit any axial or radial stress or any
vibration to the exchangers.
- The water must be analysed and treated if necessary (you are
recommended to consult a specialist qualified in water
treatment). This analysis will reveal whether the water is
compatible with the various materials with which it comes into
contact in the unit and make it possible to avoid any electrolytic
couple phenomena.
- Pipes 99.9% copper with copper and silver brazing
- Threaded bronze couplings or flat steel flanges depending on
the model of the unit.
- Plate heat exchangers and connections in AISI 316 - 1.4401
stainless steel with copper and silver brazing
0 10 20
0 -3,8 -8,3
0 -2,7 -6,5
Freezing point in C°
35
30 40
-14,5 -23,3
-11,4 -20
- The water circuit should have as few bends and horizontal
sections at different levels as possible.
- Install the stop valves close to the water inlets and outlets in
order to isolate the exchangers.
- Install the manual or automatic air bleeds at the high points of
the circuit(s).
- The manual or automatic air vents mounted on the machine
are not intended to bleed the rest of the hydraulic circuit.
(I)LDC - (I)LDH - Whether or not the machine and pump are
stopped or operating, make sure that a pressure of one bar is
always available at the suction side of the pump.
- Install the drainage connectors at all the low points of the
circuit(s).
- Insulate the cold pipes (after testing to ensure they are
watertight) in order to reduce heat loss, to prevent condensates
and to avoid damage due to frost.
- Install heating resistors on all channels liable to be exposed
to frost.
- The mechanisms necessary for filling and draining the heat
transfer fluid must be provided by the installer.
- To ensure that the pressure of the heat transfer circuit
remains lower than the intended working pressure, do not
introduce any static or dynamic pressure into the circuit.
50 60
-36,8 -53
-33,3 -50,5
Freezing point in C°