Coil Circuit Vent; Adjustment And Safety Devices; Draining Off The Water From The Heater; Domestic Hot Water Expansion Tank - Baxi COMBI LUNA DUO-TEC+ 1.28 GA Ergänzende Betriebsanleitung Für Den Installateur

When filling the system for the first time it is necessary to bleed off any air in the coil and boiler circuit. To do this it is ne-
cessary to operate the boiler alternately in domestic hot water and central heating mode with the burner turned off (follow
the instructions given in the boiler manual).

7. ADJUSTMENT AND SAFETY DEVICES

The appliance has been designed in full compliance with all the reference standards and in particular, in addition to what
is described in the relevant paragraph, the boiler is equipped with:
• Pressure relief valve (domestic water circuit)
This device is set to 8 bar and is used for the domestic hot water circuit.
Connect the safety valve to a drain trap.
Using it as a means of draining the domestic hot water circuit is strictly prohibited.

8. DRAINING OFF THE WATER FROM THE HEATER

The heater can be drained using the cock on the bottom of the heater that is accessible by removing the bottom front
panel retained by magnets:
• Remove one of the two side panels and shut off the boiler's cold water inlet cock;
• Open a hot water tap located as near as possible to the boiler;
• Fit one end of a hose over the union on the cock and connect the other end to a drain;
• Loosen the valve screw slowly.
Draining through the safety valve of the domestic hot water circuit is strictly prohibited

9. DOMESTIC HOT WATER EXPANSION TANK

(only read this section if supplied separately)
The DHW expansion vessel should be mounted if:
• the pressure of the water supply or lifting system is such as to require the installation of a pressure reducer (pressure
higher than 4 bar)
• a non-return valve is fitted to the water supply line
• the water supply network is insufficient for the expansion of the water contained in the storage boiler and it is necessary
to use the DHW expansion vessel;
To eliminate this trouble it is necessary to install an expansion tank on the domestic hot water circuit.
A domestic hot water expansion tank is available as an accessory.
To install the accessory, proceed as follows:
• Remove the lower front panel (retained by magnets);
• Drain the heater as described in §8;
• Position the expansion tank on the front recess formed in the insulation and secure it to the front crosspiece with the
two self-tapping screws;
• Remove the heater drain cock and fit the Tee connection;
• Connect the hose and the cock to the Tee connection.
Refer to the instructions supplied with the accessory too.
SUPPLEMENTARY INSTRUCTIONS
FOR THE INSTALLER

6. COIL CIRCUIT VENT

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