Manual - Solar hot water systems
32
5.3.5 Bleeding of the solar circuit
Air in the system impairs the efficiency of the solar
system considerably.Install therefore the automatic
Vaillant air separator system (item no. 302 418) in the
return of the solar circuit (see Fig. 5.12) between the
solar circuit and solar pump unit. High temperature
vapour is unlikely in this area.
The Vaillant air separator system works fully auto-
matically and does not need to be subsequently isolated.
Fig. 5.12 Installation position of the automatic air separator
system
The system must be bled whenever it is filled or
subjected to maintenance.Bleeding is performed
constantly by means of the automatic Vaillant air
separator system as long as the solar pump is in
operation.
5.4
Installation of the reheating circuit piping
Copper pipes with a minimum diameter of 22 mm should
be used for the pipes in the reheating circuit between
the Vaillant boiler and the solar cylinder.
Larger pipe diameters may be necessary for relatively
large distances between the boiler and the cylinder.
Since all wall-mounted Vaillant boilers (except
ecoMAX pro with open ventilation) have an installed
circulating pump, it is not necessary to install them.
An appropriate pump must be installed in the reheating
circuit if the solar cylinder is used with a different boiler
in accordance with the GB standard.
´B´ Port
´A´ Port
A
B
1
Fig. 5.13 Motorised 2 port valve
To prevent the uniSTOR from overheating the 2 port
motorised valve supplied with the boiler must be fitted
to the primary flow to the indirect coil.
5.5
Installation of the hot water pipework
• Connect the hot water outlet to the 22 mm hot water
connection of the solar cylinder.
• Lay a further 22 mm pipe to the first T-piece.
A pipe of 15 mm diameter should then be sufficient.
If the pipe is very long or several outlets are supplied,
continue
with another 22 mm pipe.
5.5.1
Hot water thermostatic mixing valve
A hot water thermostatic mixing valve ensures the hot
water from the cylinder is mixed with cold water to a
desired maximum temperature between 30 and 60° C.
• Set the thermostatic mixing valve to the desired
maximum temperature during the solar system
start-up.
This maximum temperature is maintained at the hot
water taps.
H
Danger!
Risk of scalding
Set the thermostat mixer to below 60 °C and
check the temperature at a hot water tap to
ensure effective protection against scalding.
5 Installation
