Baxi MULTIFIT Evacuated Tube Collector Guidance Notes page 7

Fig. 5
Read at top
of float
Adjustment
Screw
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Adjust the Flow Rate via the
Adjustment Screw
3.0 Commissioning of hydraulic stations
3.1 Checking and adjusting the flow rate East / West
1. Adjust the flow rate when the system is cold (20°C)
(see Fig. 5).
2.The flow rate should be adjusted to give the optimum flow.
3. Manually operate the solar pump (see section 2.2 paragraph
16).
Warning: The temperature control is disabled during this
procedure.
4. Set the solar pump speed selector so that the required flow
rate is achieved or exceeded with the lowest possible setting.
The flow limiter adjusting screw (Fig. 5) can be used to fine-
tune the flow rate.
5. Set the required flow rate of 2 litres for the 10 tube (East
facing).
6.The float in the flow meter will indicate the circulation flow
rate through the flow meter sight glass (Fig. 5 Item 7).
7. Adjust screw of the flow limiter with a screwdriver, until the
upper edge of the float in the sight glass indicates the required
flow rate. Turn the screw anticlockwise to increase the flow.
8. Ensure that the float is stable when the pump is running. No
air bubbles should be observed during this procedure.
9. Set manual pump operation to off (reset to zero).
3.2 Installation of the thermal insulation
1. Refit the front facia moulding onto the rear moulding.
3.3 Check & Adjusting the Flow Rate Master
Control
1. Follow section 3.1 paragraphs 1 to 4.
2. Set the flow rate to:
4 litres if 20 tubes facing West
or 6 litres if 30 tubes facing West
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