MEGAFLO Eco SolaReady, Product Manual

COMMISSIONING

23

17

© Baxi Heating UK 2012

8.0

Commissioning of system

8.1

Air Test

1. An air test may be used on the pipework to detect any gross
leakage prior to flushing and filling with solar heat transfer fluid.
Pressurise the system to a maximum of 1 bar to check for leaks.

2. Ensure that the solar expansion vessel pre-charge pressure
has been set prior to flushing and filling. 

8.2

Flushing and Filling the pipework

1. Before the system is commissioned the pipework must be
flushed to remove any contaminants. 

This must be done using

the solar heat transfer fluid as it will be impossible to fully
drain all parts of the system.

2. Connect the flushing pipes to the fill & drain valve on the
safety group (Fig. 19 Item 1) and to the fill & drain valve on the
flow meter (Fig. 19 Item 2).

3. Open the fill & drain valves.

4. Turn the slot of the adjusting screw (Fig. 19 Item 3) in the
return so the slot is vertical to open the non-return valve.

5. Turn the left hand isolating valve with integral thermometer in
the flow (Fig. 19 Item 4) in the direction indicated by the arrow
(to a 45° position) to open the non-return valve.

6. Ensure that the right hand isolating valve with integral
thermometer in the return (Fig. 19 Item 5) is open indicated by
the dot on the thermometer bezel being at the top.

7. Turn the slot of the flow meter adjusting screw (Fig. 19 Item
6) in the return vertically to open the flow limiter (Fig. 19 Item
7).

8. Flush the solar primary pump by pumping the fluid into the
system via the fill and drain valve on the safety group (Fig. 19
Item 1). 

9. Close right hand isolating valve (dot on thermometer bezel at 
9 o’clock position). Flush solar primary pipework and collector
via the fill and drain valve on the safety group. 

If reusing flushed

fluid ensure this is filtered before re-introducing into the
system.

(see Fig. 20). Use a suitable container of a large enough

volume to collect the fluid.

10. When satisfied that all pipework and component parts have
been thoroughly flushed, the system can be filled.

4

5

3

6

7

Fig. 19

Fig. 20

Fig. 21

Solar fluid

Filling pump

Filter

1

2

1

3

2

45°

Read at top
of float

Commissioning of solar primary system

Air Test
An air test may be used on the solar primary pipework to 
detect any gross leakage prior to flushing and filling with 
solar heat transfer fluid. Pressurise the system to a maximum 
of 1 bar to check for leaks.
Ensure that the solar expansion vessel pre-charge pressure 
has been set prior to flushing and filling.

Flushing and Filling the pipework
Before the system is commissioned the pipework must be 
flushed to remove any contaminants. This must be done 
using the solar heat transfer fluid as it will be impossible to 
fully drain all parts of the system.
 Connect the flushing pipes to the fill & drain valve on the 
safety group (Fig. 19 Item 1) and to the fill & drain valve on 
the flow meter (Fig. 19 Item 2).
Open the fill & drain valves.
Turn the slot of the adjusting screw (Fig. 19 Item 3) in the 
return so the slot is vertical to open the non-return valve.
 Turn the left hand isolating valve with integral thermometer 
in the flow (Fig. 19 Item 4) in the direction indicated by the 
arrow (to a 45° position) to open the non-return valve.
 Ensure that the right hand isolating valve with integral 
thermometer in the return (Fig. 19 Item 5) is open indicated 
by the dot on the thermometer bezel being at the top.
Turn the slot of the flow meter adjusting screw (Fig. 19 Item 
6) in the return vertically to open the flow limiter (Fig. 19 
Item 7).
 Flush the solar primary pump by pumping the fluid into the 
system via the fill and drain valve on the safety group (Fig. 19 
Item 1).
Close right hand isolating valve (dot on thermometer bezel 
at 9 o’clock position). Flush solar primary pipework and 
collector via the fill and drain valve on the safety group. 
If reusing flushed fluid ensure this is filtered before re-
introducing into the system. (see Fig. 20). Use a suitable 
container of a large enough volume to collect the fluid.
When satisfied that all pipework and component parts have 
been thoroughly flushed, the system can be filled.
 Pour an amount of the solar heat transfer fluid into the filling 
pump.

Figure 19 

Figure 20

17

© Baxi Heating UK 2012

8.0

Commissioning of system

8.1

Air Test

1. An air test may be used on the pipework to detect any gross
leakage prior to flushing and filling with solar heat transfer fluid.
Pressurise the system to a maximum of 1 bar to check for leaks.

2. Ensure that the solar expansion vessel pre-charge pressure
has been set prior to flushing and filling. 

8.2

Flushing and Filling the pipework

1. Before the system is commissioned the pipework must be
flushed to remove any contaminants. 

This must be done using

the solar heat transfer fluid as it will be impossible to fully
drain all parts of the system.

2. Connect the flushing pipes to the fill & drain valve on the
safety group (Fig. 19 Item 1) and to the fill & drain valve on the
flow meter (Fig. 19 Item 2).

3. Open the fill & drain valves.

4. Turn the slot of the adjusting screw (Fig. 19 Item 3) in the
return so the slot is vertical to open the non-return valve.

5. Turn the left hand isolating valve with integral thermometer in
the flow (Fig. 19 Item 4) in the direction indicated by the arrow
(to a 45° position) to open the non-return valve.

6. Ensure that the right hand isolating valve with integral
thermometer in the return (Fig. 19 Item 5) is open indicated by
the dot on the thermometer bezel being at the top.

7. Turn the slot of the flow meter adjusting screw (Fig. 19 Item
6) in the return vertically to open the flow limiter (Fig. 19 Item
7).

8. Flush the solar primary pump by pumping the fluid into the
system via the fill and drain valve on the safety group (Fig. 19
Item 1). 

9. Close right hand isolating valve (dot on thermometer bezel at 
9 o’clock position). Flush solar primary pipework and collector
via the fill and drain valve on the safety group. 

If reusing flushed

fluid ensure this is filtered before re-introducing into the
system.

(see Fig. 20). Use a suitable container of a large enough

volume to collect the fluid.

10. When satisfied that all pipework and component parts have
been thoroughly flushed, the system can be filled.

4

5

3

6

7

Fig. 19

Fig. 20

Fig. 21

Solar fluid

Filling pump

Filter

1

2

1

3

2

45°

Read at top
of float