Maintenance Of The Installation; Hydraulic Checks; Maintenance Of The Dhw Tank; Outdoor Unit Checks - Fujitsu Waterstage Split Comfort 5 Series Installation Manual

Maintenance of the installation

Before performing any maintenance, make sure that all power supplies have been
cut off .
Stored energy: after cutting off the power supplies,
wait for 10 minutes before accessing the internal parts of the equipment.
►

Hydraulic checks

If frequent refi lls are required it is absolutely
essential that you check for any leaks. If
refi lling and a pressure reset are necessary,
check what type of fl uid was used initially.
Recommended fi lling pressure: between 1 and 2 bar
(the exact fi lling pressure is determined by the water
pressure in the installation).
Periodically,
- Check the expansion circuit pressure (pre-infl ation of
1 bar) and the correct operation of the safety valve.
- Check the safety valve on the cold water supply inlet.
Make it operate as advised by the manufacturer.
The safety valve must be operated regularly to remove
scale deposits and verify that it is not blocked.
- Check the shut-off .
- Check the correct operation of the distribution valve.
►

Maintenance of the DHW tank

Maintenance on the tank must be carried out annually
(frequency may vary according to water hardness).
▼ Emptying the hot water tank
- Remove the front panel from the hydraulic unit.
- Close the cold water inlet into the tank.
- Connect a pipe on the drain valve of the water tank
drain valve (ref. 1) for discharging water to the sewer.
The discharge pipe must be kept open in the open air.
- Open a hot water tap and open the water tank drain
valve (ref. 1).
▼ Descaling
- Empty the water tank.
- Remove the cowl from the electrical backup (ref. 2).
- Disconnect the electrical backup.
- Disconnect the ACI.
- Remove the electrical backup (ref. 3).
- Descale the exchanger to maintain performance.
- Remove any scale deposits that may have accumulated
in the tank. It is best to leave any scale sticking to the
sides of the tank: this forms a protective layer.
- Gently remove any scale deposits on the thermowell.
Do not use any metal objects or chemical or abrasive
products.
- Replace the electrical backup's gasket (ref. 4) each
time it is dismantled.
- Reinstall the electrical backup and tighten alternate
nuts in rotation.
- Reconnect the electrical backup.
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Fermeture
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fi g. 52 - Emptying the hydraulic unit and/or Domestic hot
water tank
- Reconnect the ACI.
- Replace the cowl on the electrical backup.
►

Outdoor unit checks

- Remove any dust from the exchanger, if necessary,
while making sure not to damage the blades.
- Straighten the blades using a comb.
- Check that there is nothing blocking the air fl ow.
- Check the fan.
- Verify that condensate drain is not obstructed.
▼ Refrigeration circuit checks
- Check there are no leaks (connections, valves...).
►

Electrical circuit checks

- Check the connections and re-tighten if necessary.
- Check the state of the cables and plates.
- ACI light: During normal operation, this light fl ashes.
Waterstage Split Comfort DHW Serie / INSTALLATION / 2125 - EN
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