Olimpia splendid OS-CEBCH36EI, Instructions For Installation, Use And Maintenance Manual, Page: 49 / 88

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ENGLISH
2.5.2 Hydraulic circuit (fig. 19)
The hydraulic diagram in fig. 19 shows the main parts of the internal unit and a typical hydraulic circuit.
1 System water return
2 Safety valve (3 bar)
3 Pressure gauge
4 System water return temperature probe T1
5 Plate heat exchanger
6 System water flow temperature probe T2
7 Flow switch
8 Expansion vessel
9 Electrical heater elements collector
10 Automatic air breather
11 Circulation pump
12 3-way diverter valve (integrated on board the machine in version 3W)
13 System water outlet
14 Water outlet for domestic water storage
15 Mesh water filter
16 Refrigerant pipe connections
17 Domestic heater temperature probe T3
18 Domestic hot water return circuit
19 Flow diverter with flow meter
20 DHW circuit compressor
21 Thermostatic valve
22 Compressor flow temperature probe T5
23 DHW circuit high temperature water outlet temperature probe T6
24 DHW Circulation pump
25 Non return valves
26 DHW circuit evaporator outlet temperature probe T7
A Internal unit
B External unit
C System (fan coils, radiators or radiant panels/floors)
D Domestic water storage
E Thermal solar panels
Fit a sieve filter with 0.4 mm mesh to the water return pipes from the system and from the DHW tank.
2.6 SYSTEM WATER REFERENCE VALUES
• pH: 6.5 to 7.8
• Electric conductivity: between 250 and 800 µS/cm
• Total hardness: between 5 and 20 °F
• Total iron: below 0.2 ppm
• Manganese: below 0.05 ppm
• Chlorides: below 250 ppm
• Sulphur ions: absent
• Ammonium ions: absent
If the total hardness is above 20°F or some of the make-up water reference values are not within the indicated limits, contact our
pre-sales service to determine the treatments to be used.
Bore or groundwater not from the water supply system should always be carefully analysed and if necessary treated with appropriate
systems. If installing a softener, in addition to following the manufacturer’s guidelines adjust the hardness of the outlet water to
no lower than 5°F (also run pH and salinity tests) and check the concentration of chlorides at outlet after regeneration of resins.
In the case of possible freezing, empty the system and introduce an antifreeze liquid in a proportion that is appropriate for the
minimum temperatures that can be reached.
Solutions of water and ethylene glycol used as heat-transfer liquids in place of water cause a reduction in the performance of the
unit. Add a maximum of 35% of ethylene glycol (protection equivalent to as low as -20°C) to the water.
2.7 HYDRAULIC SYSTEM FILLING
Once the hydraulic connections are complete, the system must be filled. At the same time, the air inside the pipes and appliance
must be bled through the air breathers on the circuit and appliance.
Initially, with the water circuit empty, the machine must not be connected to the power supply.
Only in the final phases of filling the hydraulic circuit can the machine be powered and the circulation pump started.
It is advisable to temporarily force the circulation pump for 15 minutes.
If an external auxiliary pump is used, this must also be started solely in the final circuit filling phases.
The system operating pressure must not exceed 1.5 BAR with the pump off.
In any case, to test for system leaks raise the test pressure (maximum pressure 3 bar), then discharge it to reach the operating
pressure.
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