Maintenance of the installation. Fujitsu WGYG140DG6/WOYG112LHT, WGYK160DG9/WOYK140LCTA, WGYK160DG9/WOYK160LCTA

Air to Water Heat Pump (Split integrated DHW type)

11 Maintenance of the installation

Ensure that the general electrical power supply has been cut off before starting any repair work.

11 .1 Hydraulic checks

"

Warning : If frequent refills are required it is essential that you look for any leaks .

If filling and re-pressurization are required, check what type of fluid has been used initially.

Recommended filling pressure: 1 to 2 bar

(Precise filling 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.

11 .2 Maintenance of the DHW tank

Maintenance of the tank must be undertaken once a year

(The frequency may vary according to water hardness).

11 .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

).

11 .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 finger. Do not use any metal objects or chemical or abrasive products.

- Replace the joint of the electrical back-up (ref. each time it is dismantled.

4

)

- 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.

5

1

Close

Open

4

6

3

2

figure 58 - Emptying the hydraulic unit and/or Domestic hot water tank

11 .3 Checking the outdoor unit

- Dust off the heat exchanger if necessary, being careful not to damage the fins.

- 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 refrigerant circuit :

- When the refrigerant charge is in excess of 2kg

(>10kW models), it is compulsory to have an approved after sales service check the refrigerant circuit every year (with a certificate of capacity for the handling of

refrigerants) (see para. 10.2, page 70)

- Check the lack of leak (connections, valves…).

11 .4 Electrical checks

- Check connections and possible tightening.

- Check the cables condition and electronic boards.

- ACI light: In normal operation, the light flashes.

- 74 -

Installation and operating manual "1768 - EN"