fi gure 54 - Emptying the hydraulic unit
and/or Domestic hot water tank
7 Maintenance of the installation
Ensure that the general electrical power supply has
been cut off before starting any repair work.
7 .1 Hydraulic checks
"
Warning : If frequent refi lls are required
it is essential that you look for any leaks .
If fi lling and re-pressurization are required,
check what type of fl uid has been used initially.
Recommended fi lling pressure: 1 to 2 bar
(Precise fi lling pressure is determined by the manometric
height of the installation).
Each year,
- Check the expansion vessel pressure (precharge 1 bar)
and the correct functioning of the safety valve.
- Verify the safety unit on the cold water supply inlet.
Make it work as prescribed by the manufacturer.
- Check the shut-off.
- Verify the correct functioning of the distribution valve.
7 .2
Maintenance of the DHW tank
Maintenance of the tank must be undertaken once a year
(The frequency may vary according to water hardness).
7 .2 .1
Emptying the hot water tank
- Remove the facade from the hydraulic unit.
- Close the cold water entry into the tank.
- Open a hot water tap and open the water tank emptying
valve (ref.
1
).
7 .2 .2 Descaling
- Empty the water tank.
- Remove the hood of the electrical back-up (ref.
2
).
- Disconnect the electrical back-up.
- Unplug the ACI.
- Remove the electrical back-up (ref.
3
).
- Remove any limescale deposits that have built up
inside the tank. It is best to let the scale stuck to the
walls of the tank: it forms a protective layer.
- Gently remove any limescale deposit on the glove
fi nger. Do not use any metal objects or chemical or
abrasive products.
- Replace the joint of the electrical back-up (ref.
4
)
each time it is dismantled.
- Replace the electrical back-up and carry out ‘crossed’
locking of the nuts.
- Reconnect the electrical back-up.
- Plug in the ACI.
- Replace the hood of the electrical back-up.
1
5
6
2
4
3
7 .3 Checking the outdoor unit
- Dust off the heat exchanger if necessary, being careful
not to damage the fi ns.
- Straighten the vanes using a comb.
- Check that there is nothing obstructing the passage of air.
- Check the fan.
- Verify that condensate drain is not obstructed.
•
Checking the refrigeration circuit :
- When the refrigerant charge is in excess of 2kg
(>10kW models), it is compulsory to have an approved
after sales service check the refrigeration circuit every
year (with a certifi cate of capacity for the handling of
refrigerants) (see para.
6.2, page 63)
- Check the lack of leak (connections, valves…).
7 .4 Electrical checks
- Check connections and possible tightening.
- Check the cables condition and electronic boards.
- ACI light: In normal operation, the light fl ashes.
Close
Open
Installation and operating manual "1572 - EN"
Heat pump air/water split 2 services alféa excellia duo
- 66 -
