Connecting; The Heating Circuit Hydraulically; General; Rinsing Out The Installation - Fujitsu AOYA18LALL Installation And Operating Manual

Heat pump air/water split single service
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Heat pump, Split, single service



the heating circuit hydraulically


The connection must comply with good trade
practice according to local building regulations.
The heating circulating pump is built into the
hydraulic module.
Connect the central heating pipes to the hydraulic
module, complying with the direction of circulation.
The diameter of the pipes between the hydraulic
module and the heating collector must be at least 1
inch (24x36mm).
Calculate the diameter of the pipes according to the
flow rates and the lengths of the hydraulic systems.
Use union connectors to facilitate removing the
hydraulic module.
Preferentially use connection hoses to avoid
transmitting noise and vibrations to the building.
Connect the drains from the drain valve and the
safety valve to the main sewer system.
R e m i n d e r : S e a l e v e r y t h i n g w h e n f i t t i n g i n
accordance with prevailing trade practice for
plumbing work:
- Use suitable seals (fibre seals, o-rings).
- Use Teflon tape or hemp.
- Use sealing paste (synthetic depending on the
The use of glycol is not necessary.
If you are using a glycol/water mix, provide for an
annual check on the quantity of glycol.
In certain installations, the presence of different
metals can cause corrosion problems; the formation
of metal particles and sludge in the hydraulic circuit
is then seen.
In this case, it is advisable to use a corrosion inhibitor
in the proportions indicated by its manufacturer.
It is also necessary to ensure that the treated water
does not become aggressive.
Figure 25 - Release of the
circulation pump
Installation and operating manual "1350-EN"
Before connecting the hydraulic module to the
installation, rinse out the heating system correctly to
e l i m i n a t e a n y pa r t i c l e s t h a t m a y a ff e c t t h e
appliance's correct operation.
Do not use solvents or aromatic hydrocarbons
(petrol, paraffin, etc.).
In the case of an old installation, provide a sufficiently
large decanting pot with a drain on the return from
the boiler and at the lowest point in the system in
order to collect and remove the impurities.
Add an alkaline product to the water and a
Rinse the installation several times before filling it
Check the pipe fixings, the tightness of the
connectors and the stability of the hydraulic module.
Check the direction in which the water is circulating
and that all the valves open.
Proceed to fill the installation.
Do not operate the circulating pump while filling.
Open all the drain valves in the installation and the
bleed valve for the hydraulic module to remove the
air contained in the conduits.
Close the drain and bleed valves and add water until
the pressure in the hydraulic circuit reaches 1.5 bar.
If the pressure is lower than 0,5 bar, the Heat Pump
stops and posts error 369.
Check that the hydraulic circuit has been purged
Check that there are no leaks and that the circulating
pumps are not seized (if need be, release them).
After the "Start-up" stage (see p. 30), once the
machine has started, purge the hydraulic module
again (2 litres of water).
S 5
S 6
S 8
S 10
S 13
S 16
Figure 26 - Recommended
circulation speed (for radiator)

Rinsing out the installation

Filling and purging the installation

Figure 27 - (P) Hydraulic
module bleeder valve

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