Servicing; Hydraulic Checks; Maintenance Of The Dhw Tank (Duo Models); Emptying The Hot Water Tank - Fujitsu WATERSTAGE WOYG160LJL Maintenance Document

Servicing

Before any maintenance operation,
ensure that the general power supply is switched off .
►

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: 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.
►
Maintenance of the DHW tank
(Duo models)
Maintenance of the tank must be undertaken once a year
(The frequency may vary according to water hardness).

▼ 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).

▼ 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.
- Reconnect the ACI.
- Replace the cowl on the electrical backup.
- 96 -
Close
5
1
fi g. 5 - Draining the hydraulic unit and/or hot water tank
►

Checking the outdoor unit

- 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.
• Checking the refrigeration circuit :
- If the amount of refrigerant in the system exceeds
2kg (models > 10kW), the refrigeration circuit must be
checked annually by an approved engineer (they must
have a certifi cate of competence for the handling of
refrigerants).
- Check there are no leaks (connections, valves...).
►

Checking the electrical circuit

- Check connections and possible tightening.
- Check the cables condition and electronic boards.
- ACI light: In normal operation, the light fl ashes.
Waterstage / Maintenance Manual / 2105 - EN
6
Open
4 3
2