Connecting Pipework - Baxi 2nd Fix Solar Manual

Fig. 15
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2
Fig. 16
Flow Return
Fig. 17
from to
panel panel
1
Flow Return
to from
cylinder cylinder
Fig. 18
Return to hydraulic station
Return from cylinder
Flow to cylinder
16 © Baxi Heating UK 2012
1
4
3
2
3
2
4
To a suitable container
(e.g. Solar fluid discharge vessel
Accessory No. 720294601)
7.0 Installation of hydraulic station
7.7 Installing the safety group
1. Connect the safety group (Fig 15 Item 1) to the connection
on the hydraulic station return isolating valve assembly (Fig 15
Item 3). Ensure that the pre-fitted gasket is securely in place on
the safety group prior to connection.
7.8 Connecting the solar expansion vessel
1. Mount the solar expansion vessel (Fig 16 Item 1) adjacent to
the hydraulic station (Fig 16 Item 2) so that the vessel can be
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connected to the vessel connection of the safety group (Fig 16
Item 3) using the flexible pipe (Fig 16 Item 4) supplied. (Note:
1
Solar expansion vessel, mounting bracket, self sealing connection
and flexible pipe are supplied in the Ancillary Components kit).
2. 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. 16 Item 5).
3. DO NOT replace the solar expansion vessel with either a
potable water expansion vessel or boiler sealed system vessel.
4. The charge pressure of the solar expansion vessel must be
adjusted (when the fluid circuit is empty or de-pressurised) to a
pressure equal to the static head + 0.4 bar, or a minimum of 1.2
bar. (NOTE: the static head is the height difference between the
highest point in the pipework (collector) and the hydraulic
station in metres x 0.1 bar. The charge pressure should not
normally exceed 1.9 bar - see also Section 7.4.
7.9

Connecting pipework

1. Connect the flow and return pipes to the pump station via
compression fittings (Fig 17 Item 1). Fittings are for 22mm o/dia
pipe. Support the hydraulic assembly when tightening
connections.
2. Installing a drain valve
It is recommended to install a device for draining the solar
heating system (tee piece with drain valve, Fig. 18) into the flow
and return at the lowest point in the solar heating system. The
drain and its rubber seal must be suitable for solar applications.
3. Connecting the solar cylinder
For detailed installation instructions refer to the
installation instructions supplied with the solar cylinder.