Manual - Solar hot water systems 0020009607_02
56
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.
N
4
N
4
2
4
4
3
3
3
3
3
2
2
2
2
1
1
L
2
1
L
1
1
1
1
3
C
B
E
E
E
E
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
5
9
6
L
N
E
Room thermostat
Fig. 5.38 Connection of room thermostats from third-party
manufacturers if the external wiring box is used
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 filling.
Expansion vessel admission pressure
During the start-up, the gas side admission pressure p
v
of the expansion vessel must be adjusted to the
equipment height whilst disconnected. The static
pressure p
stat
corresponds, to a certain extent, to the
static height h between the collector array and the
expansion vessel.
10 m static height correspond to approx. 1 bar.
p
v
= p
stat
= h x 0.1
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.
8
6a 6b
15
14
13
12
1
2
5
3
20
19
10
9
21
11
Fig. 6.1 Start-up of the total system
Flushing and filling the solar circuit and subjecting it to
a hydraulic pressure test
Flushing is performed from the solar pump unit to the
cylinder via the collector. This is how to do it:
• Open the fill/vent valve (
1
) and connect the filling
pump to the fill/vent valve (
1
).
• Place the three-way ball valve (
15
) into flush position.
• Connect the drain hose of the Vaillant filling pump or a
similar hose with filter (
9
) to the fill/drain valve (
12
).
Put the other end into the solar fluid container (
10
).
• Pump in solar fluid from the container by the filling
pump (
19
) via the fill/drain valve (
1
), so that the solar
fluid from fill/drain valve (
12
) is filtered and flows back
into the container.
• To flush and filter the solar circuit, pump circularly for
10 minutes. Monitor the filter and clean it if necessary.
5 Installation
6 Start-up
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