Start-Up 6; Flushing And Filling The Solar Circuit - Vaillant Solar hot water System Manual

Alternatively to the Vaillant VRT 30 room thermostat,
you can also connect devices from third-party
manufacturers.
• Connect the room thermostat as illustrated in Fig. 5.38.
Room thermostat
ACL Drayton Digistat 2, 3, 4
ACL Drayton RTS 1, 2
Danfoss Randall RX-1
Danfoss Randall RMT 230
Danfoss Randall RET 230
Tower SS
Honeywell T6360
Horstmann HRT 1
Siemens-Landys & Staefa RAD 1
Sunvic TLX 2000 series
Fig. 5.38 Connection of room thermostats from third-party
manufacturers if the external wiring box is used
Manual - Solar hot water systems
5 9 6 L N E
3 1
N 3 L
3 2 C B
4 2 1
N 3 L
4 2 1 E
2 3 1
4 2 1 E
2 1 E
4 1 3
E
6 Start-up
You must adhere to the following procedure for the
start-up of the total system:
• Flush and fill the solar circuit with solar fluid (refer to
Section 6.1).
• Set the flow rate and pump (refer to Section 6.2).
• Set the flow rate on the controller
(refer to Section 6.3).
• Fill the hot water secondary circuit
(refer to Section 6.4).
• Set the hot water thermostatic mixing valve (refer to
Section 6.5.)
• Fill the reheating circuit (refer to Section 6.6).
Use only Vaillant solar fluid (item no. 302 429) for
pressure tests and for flushing and filling the solar
circuit.
6.1

Flushing and filling the solar circuit

Vaillant recommends using the Vaillant filling pump to
flush and fill the solar circuit. Observe the operating
manual when using the Vaillant filling pump. It is not
permitted to use manual pumps for
Expansion vessel admission pressure
During the start-up, the gas side admission pressure p
of the expansion vessel must be adjusted to the
equipment height whilst disconnected. The static
pressure p corresponds, to a certain extent, to the
stat
static height h between the collector array and the
expansion vessel.
10 m static height correspond to approx. 1 bar.
p = p
v
h Note!
A deviation from the optimum admission or
filling pressure always results in a reduction of
the expansion vessel's effective volume. This
can cause operational malfunctions.
Installation 5

Start-up 6

filling.
= h x 0.1
stat
v
51