Installation, user and maintenance manual
– AY Condensing line, AY series
33
Nevertheless, it is advisable to consult the technical specifications of the monoethyle-
ne glycol used. If automatic loading systems are used, a seasonal check of the quantity
of glycol present in the plant is also necessary.
Table 4�2 – Technical data for filling the hydraulic circuit
% of MONOETHYLENE
GLYCOL
10
15
20
25
30
35
40
WATER FREEZING POINT
TEMPERATURE
-3°C
-5°C
-8°C
-12°C
-15°C
-20°C
-25°C
PERCENTAGE OF INCREASE IN
PRESSURE DROPS
--
6%
8%
10%
12%
14%
16%
Percentage of glycol as a function of water freezing temperature (design).
4�7
FILLING THE APPLIANCE’S INTERNAL CIRCUIT
The machine is factory charged to 2 bar with a water/glycol mix which enables the
machine to be safely stored down to -30°C.
The antifreeze function, in order to protect the internal circuit, actuates the dedicated
water circulator so as to keep the water in the circuit at a temperature of more than
-10°C and hence the electrical components at more than -20°C. Make sure that the
machine's internal circuit is always charged with an adequate glycol solution.
Remove the front panel of the appliance to read the internal circuit charging pressure
of the appliance on the external filling pressure gauge (Figure 4.4 Filling the machine's
internal circuit
→
34, detail B).
The optimal pressure value is in the range 1 and 2 bar. If the internal circuit must be
recharged, proceed as follows:
The internal circuit is hermetically sealed. If the circuit is empty (this is a fault), iden-
tify the leak and restore the seal (for example, by replacing defective gaskets) before
proceeding.
You will need: 50-50 glycol solution; volumetric charging pump capable of pressuring
the circuit to 2 bar; hose to connect to the provided D.13 union; provided union.
Remove the front panel.
1.
Open the internal front panel.
2.
Remove the cap closing the filler cap and connect the provided D.13 union (Fi-
3.
gure 4.4 Filling the machine's internal circuit
→
34, detail D).
Connect the volumetric charging pump to the union with a hose.
4.
Open the filler cock (Figure 4.4 Filling the machine's internal circuit
5.
→
34, detail
C), with a flathead screwdriver, and charge the circuit with enough glycol solu-
tion to achieve the specified optimal pressure.
Take care not to allow air to enter the circuit.
Open the cap on the automatic bleed valve on the internal circuit and run the
1.
machine for 3 minutes to bleed the circuit.
If the circuit gurgles during operation, this indicates that air is present in the cir-
2.
cuit; connect a hose to the manual bleed cock on the top of the combustion unit
(Figure 4.4 Filling the machine's internal circuit
→
34, detail A), open the cock by
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