FireBird Enviroair 11kW, Installation & Operation Manual

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8.2.5 Water filling
1 Check that a water check valve with a shut-off valve (field
supplied) is connected to the water filling point (water inlet
connection) for filling the space heating hydraulic circuit
(see “8.2 Space heating and DHW”).
2 Make sure all the valves are open (water inlet / outlet
shut-off valves and the rest of valves of the space heating
installation components).
3 Ensure that the air purgers of the unit and installation are
open (turn the unit air purger twice at least).
4 Check that the drain pipes connected to the safety valve
(and to the drain pan in case of installing the “Cooling kit”
accessory) are correctly connected to the general draining
system. The safety valve is later used as an air purging device
during the water filling procedure.
5 Fill the space heating circuit with water until the pressure
displayed on the manometer reaches approximately 1.8 bar.
NOTE
While the system is being filled with water, it is highly
recommended to operate the safety valve manually so as
to help with the air purging procedure.
6 Remove as much air from inside the water circuit as possible
through the air purger and other air vents in the installation
(fan coils, radiators...).
7 Start the air purge procedure test. There are two modes
(Manual or Automatic) which helps in case of installations with
heating and DHW operation:
a. Manual: start and stop the unit manually using the unit
controller (run / stop button) and also using the DSW4pin 2
of the PCB1 (ON: Forced to derive to DHW coil; OFF: Forced
to derive to space heating).
b. Automatic: select the air purge function using the user
controller. When the automatic air purge function is
running, the pump speed and the position of the 3-way
valve (space heating or DHW) are automatically changed:
8 If a little quantity of air is still remaining in the water circuit,
it will be removed by the automatic air purger of the unit
during the first hours of operation. Once the air in the
installation has been removed, a reduction of water pressure
in the circuit is very likely to occur. Therefore, additional
water should be filled until water pressure returns to an
approximate level of 1.8 bar.
NOTE
• The unit is equipped with an automatic air purger (factory
supplied) at the highest location of the unit. Anyway, if
there are higher points in the water installation, air might
be trapped inside water pipes, which could cause system
malfunction. In that case, additional air purgers (field
supplied) should be installed to ensure no air enters into the
water circuit. The air vents should be located at points which
are easily accessible for servicing.
• The water pressure indicated on the unit manometer may
vary depending on the water temperature (the higher
temperature, the higher pressure). Nevertheless, it must
remain above 1 bar in order to prevent air from entering
the circuit.
• Fill in the circuit with tap water. The water in the heating
installation must comply with EN directive 98/83 EC.
Non-sanitary controlled water is not recommended
(for example, water from wells, rivers, lakes, etc.).
• The maximum water pressure is 3 bar (nominal opening
pressure of the safety valve). Provide adequate reduction
pressure device in the water circuit to ensure that the
maximum pressure is NOT exceeded.
• For heating floor system, air should be purged by means
of an external pump and an open circuit to prevent the
formation of air pockets.
• Check carefully for leaks in the water circuit, connections
and circuit elements.