Connecting Pipework - Baxi Solarflo Installation Manual

Fig. 16
3
2
Fig. 17
2
Flow Return
Fig. 18
from to
panel panel
1
Flow Return
to from
cylinder cylinder
Fig. 19
Return to hydraulic station
Return from cylinder
Flow to cylinder
18 Solarflo - Solar Thermal Domestic Hot Water System
1
4
3
3
2
4
9.0 Installation of hydraulic station
9.7 Installing the safety group
Connect the safety group (Fig 16 Item 1) with the gasket
(Fig 16 Item 2) enclosed to the connection on the
hydraulic station return isolating valve assembly (Fig 16
Item 3).
9.8 Connecting the solar expansion vessel
Mount the solar expansion vessel (Fig 17 Item 1) adjacent
to the hydraulic station (Fig 17 Item 2) so that the vessel
5
can be connected to the vessel connection of the safety
group (Fig 17 Item 3) using the flexible pipe (Fig 17 Item
1
4) supplied. (Note: Solar expansion vessel, mounting
bracket, self sealing connection and flexible pipe are
supplied in the Ancillary Components kit).The vessel
must be mounted as shown (connection to top) and
securely supported using the wall bracket supplied.The
self sealing vessel connection should be screwed onto
the vessel connection before connecting the flexible pipe
(Fig. 17 Item 5).
DO NOT replace the solar expansion vessel with either
a potable water expansion vessel or boiler sealed system
vessel.
The charge pressure at the solar expansion vessel should
be adjusted such that when not under load the charge
pressure is 0.4 bar above the static system head (the
height of the top of the collector panels above the
hydraulic station). A one metre head represents 0.1 bar.
However, the charge pressure should be at least 1.2 bar.
The maximum static system head is 15m (1.5 bar).
9.9

Connecting pipework

Connect the flow and return pipes to the collectors and
to the cylinder via compression fittings (Fig 18 Item 1).
Fittings are for 22mm o/dia pipe. Support the hydraulic
assembly when tightening connections.
Run a pipe (Fig 18 Item 2) from the exit opening in the
pressure relief valve (Fig 18 Item 3) to a suitable
container (Fig 18 Item 4) and secure it.
9.9.1 Installing a drain valve
Install a device for draining the solar heating system
(tee piece with drain valve, Fig. 19) into the flow and
return at the lowest point in the solar heating system.
9.9.2 Connecting the solar cylinder
For detailed installation instructions refer to the
installation instructions supplied with the solar cylinder.