Instructions on commissioning, maintenance, and troubleshooting for auroSTOR 0020111119_02
29
6.3
Pipes for the primary heating circuit
Make sure that the pipes in the primary heating circuit
between the gas-fired wall-hung boiler and cylinder are
as short as possible. Use copper piping with a minimum
diameter of 22 mm.
A heating pump is installed in all Vaillant gas-fired wall-
hung boilers (apart from the ecoMAX pro with open ven-
tilation). If you are using the cylinder with another gas-
fired wall-hung boiler as per GB standards, you may have
to install a suitable heating pump in the primary heating
circuit.
Installing the two port motorised valve
1
Fig. 6.3 Two port motorised valve
The two port motorised valve prevents the cylinder from
overheating.
>
Install the two port motorised valve (
1
) supplied with the
cylinder in the flow line (
A
¬
Fig. 3.1
) of the gas-fired
wall-hung boiler.
>
Note the direction of flow, which is marked with arrows.
i
You can install the 2-way motorised valve verti-
cally or horizontally. If you install the 2-way
motorised valve horizontally, you must install
the valve with the valve head facing upwards
(
¬ fig. 6.3
).
6.4
Installing hot water pipes
>
Connect the hot water piping to the 22 mm hot water
draw off of the cylinder.
>
Lay the 22 mm piping up to the first T-piece.
The required diameter of subsequent pipes depends
on the system design.
Connecting up the secondary circulation line
The cylinder has a connection with a 15 mm diameter
for a secondary circulation line.
>
Connect a WRAS-approved circulation pump which has a
non-return valve with the secondary return.
>
Establish the connection to the secondary circulation
line.
i
If a secondary circulation line is used, an addi-
tional expansion vessel may be required in
some circumstances.
i
If you are not using the secondary return,
this must be properly closed off with the cap
included in delivery.
6.5
Hot water thermostat mixer
1
2
AB
B
A
Fig. 6.4 Hot water thermostat mixer
Key
1 Thermostat
mixer
2 Non Return Valve
A Hot
water
B Cold
water
AB Mixed water
In a solar heating system, a hot water thermostat mixer
must be installed as scald protection. The hot water
thermostat mixer mixes the hot water from the cylinder
with cold water to produce water with a maximum tem-
perature of between 30 and 60 ºC as required.
The hot water thermostat mixer must be provided by the
customer.
Installation 6