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Figure 12
Combi general installation scheme
2.3. HYDRAULIC INSTALLATION RULES
2.3.1. Radiator and DHW Installations
Radiator ad ground heating installation should be constructed in accordance
with legistation in force technical specifications and heat loss calculation.
Radiator type and amount and ground heating installation pipe amount
should comply with the heat loss calculation.
• Radiator installation should be designed as resisting to at least 6 bars.
• If the city grid pressure is higher than 6,5 bars, pressure reducer must be
installed.
• It is recommended to construct the radiator installation as double line and
without using bends and joints as much as possible.
• Strainer filter must be installed in radiator return and tap water (city grid)
input line.
• For example; as the radiator cycle's 8 litres expansion (24 kW) tank
can support maximum (80 °C in radiator system) 140 litre and (55.C in
ground heating system) 170 litre installation water expansion, additional
expansion tank should be used for larger installation volumes. 170 litre
installation water expansion, additional expansion tank should be used for
larger installation volumes.
• If the room thermostat and thermostatic radiator valve shall be used
together; thermostatic valve should not be installed in radiators in the
place where room thermostat is available!
• Cross connection must be made for efficient functioning in radiators
longer than 1,5 m.
• Covers should be used for radiator and hot tap water wall passages and
fixed with wall clamps for preventing slopes in expansions due to heating.
• Combi can function under minimum 0,5 bar tap water pressure and that
corresponds to a very low flow rate and therefore, it shall not possible to
adjust the requested tap water temperature. For this reason, tap water
line should be installed at shortest distance with pipe having at least ½”
internal diameter and by using bends as low as possible. At least 1 bar
pressurized grid input water should be supplied for acquiring the comfort
requested in the hot tap water. Hydrophore should be used if required.
• Prior to filling the radiator installation, it must be flushed and all wastes
must be cleaned!
Warning: In order to prevent invalidity of device warranty prior to
making combi connections, clean residues likely to be occurred in
main heat exchangers (pipes, heater assembly, etc.) via dissolvent
or equal substances, otherwise they will negatively affect functioning of the
combi. In order to prevent lime scales in the radiator installation and therefore
faulty operation of installation, follow rules envisaged by standards regarding
domestic tap water and radiator installations.
Warning: It is recommended to install a Anti-Lime Kit for preventing
occurrence of lime scales at places where water hardness is higher
than 25 French degree in order to protect service life and efficiency
of the hot tap water heat exchanger.
2.3.2. Filling/Emptying Radiator Installation
Ensure that the pressure reaches to 1-1,5 bar in the Manometer indicated with
G symbol by rotating the Fill Tap counter clockwise that is indicated with
F symbol in Lower Figure 7 for filling the closed circuit radiator installation
after installation of the and close the Filling Tap by rotating clockwise and
discharge air of radiators via air discharge valves.
Combi safety valve discharge should be connected to a discharge funnel.
Otherwise, safety valve shall be activated and manufacturer shall not be
responsible due to water discharge to the place of device.
Discharging the Condensation Water
For discharging the condensation water produced by the device, it should
be connected to waste water grid via at least Ø 24 mm pipes resistant to
acidic condensation waters. Connection of the device with waste water grid
should be made as preventing frost of the liquid contained in the connection
installation. Prior to starting the device, ensure that the condensation
water is correctly discharged; then verify that the siphon is filled through
condensation at first start (parag. 2.2.10). Also, instructions in force, national
and local arrangements should be taken into consideration for discharge of
waste waters.
Heating Return (cold)
City water line
Heating
Flow
(hot)
Condensation
water outlet
