Daikin GCU compact Series, Installation And Operating Instructions Manual

Page: 57 / 80

9 Service and maintenance
Installation and operating instructions
57
Gas Combi Unit
Floor-standing gas condensing boiler with integrated heat storage
008.1543899_02 – 04/2019 – EN
Fig. 9-7 Filling the heating system and storage tank charging cir-
cuit (shown on the GCU compact 5xx)
1 Filling hose with non-return valve (and pressure gauge)
(20)
)
2 Combined filling and draining valve
3 Heater ballcock - inflow
4 Heater ballcock - return flow
5.1 Valve drive
5.2 Unlocking key of the drive lock
6 Water tap
7 Automatic vent valve
8 Pressure gauge
3UV DHW 3-way distribution valve
3UVB1 3-way mixer valve
1 Connect the filling hose ( Fig. 9-7 , item 1) with the non-return
valve and an external pressure gauge
(20)
(on the building side)
to the fill/drain cock ( Fig. 9-7 , item 2) and secure it against slip-
ping off with a hose clamp.
2 Make sure that the automatic vent valve cap is open ( Fig. 9-8 ,
item A).
Fig. 9-8 Undoing the automatic vent valve cap
A Automatic vent valve cap
3 Open the water tap ( Fig. 9-7 , item 6) on the feed pipe.
4 Open the fill/drain cock ( Fig. 9-7 , item 2) and observe the pres-
sure gauge ( Fig. 9-7 , item 8).
5 Fill the system with water until the pressure gauge shows that
the system target pressure is reached (
system 2 m ,
1 m water column corresponds to 0.1 bar). The overpressure
valve must not actuate.
6 Close the fill/drain cock ( Fig. 9-7 , item 2).
7 Vent the hydraulic block (see Chap. 9.2.7 ).
8 Close the water tap ( Fig. 9-7 , item 6) on the feed pipe.
9 Disconnect the filling hose ( Fig. 9-7 , item 1) with non-return
valve from the fill/drain cock ( Fig. 9-7 , item 2).
9.2.7 Venting the hydraulic block
1 Make sure that the automatic vent valve cap is open ( Fig. 9-8 ,
item A).
Fig. 9-9 Connecting the vent hose
B Manual vent valve
2 Provide the manual vent valve ( Fig. 9-9 , item B) with a hose and
direct it away from the device. Open the valve until water comes
out.
3 Switch on the power supply to the GCU compact.
(20)
if not already installed in the heating system