Commissioning Of Hydraulic Station - Baxi 2nd Fix Solar Manual

Fig. 27
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24 © Baxi Heating UK 2012
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10.0

Commissioning of hydraulic station

10.1 Ensure the solar primary system is free from air
1. Switch on the power supply to the solar differential
temperature controller.
2. Manually switch the circulation pump ON and OFF via the
solar differential temperature controller (see section 11.5) to
pump fluid around the solar primary system.
3. Turn the pump off and open the airbleed screw on the air
separator (Fig. 27 Item 1). Bleed any air from the air separator.
If the system pressure drops top up by opening the fill and
drain valve (Fig. 27 Item 2) on the safety group and pumping in
more solar fluid to restore the pressure. This must be repeated
until the pressure remains stable.
10.2 Setting the system pressure
1. During commissioning, the system pressure should be 0.7
bar above the static pressure (1 metre height differential
equals 0.1 bar). However, it must be at least 1.5 bar and no
higher than 2.2 bar.
2. Determine the system pressure when the system is cold
(20°C). This should be recorded on the Commissioning
Record Sheet.
3. If the pressure is too low you should pump additional heat
transfer fluid into the system; the fill & drain valve on the safety
group (Fig. 27 Item 2) needs to be opened for this purpose.
When system pressure is correctly set, ensure the fill and drain
valve is closed and remove filling hose from safety group.