Technical data

10.0 Commissioning the Boiler – page 26
10.1 Commissioning the Boiler
1. Reference should be made to BS 5449 Section 5
when commissioning the boiler.
2. Open the cold feed to the boiler.
3. Open all hot water taps to purge the DHW system.
4. Ensure that the filling loop is connected and open,
then open the heating flow and return valves on the
boiler.
5. Open the automatic air vent (Fig. 37). To help purge
the primary circuit turn the pump on & off several
times by using the On-Off selector switch (Fig. 39).
6. The system must be flushed in accordance with BS
7593:1992 (see Section 6.2) and the flushing agent
manufacturers instructions.
7. Pressurise the system to 1.0 bar then close and
disconnect the filling loop.
8. Turn the gas supply on and purge the system
according to BS 6891.
9. Test for gas soundness.
10. Run the system and check the boiler for correct
operation. Check the gas pressure at both the inlet
and the burner pressure tappings on the gas valve
(see Technical Data - Section 4.0).
11. The system should then be flushed again and
treated in accordance with BS 7593:1992 and the
flushing agent/inhibitor manufactures instructions.
10.2 Adjusting D.H.W. Setting Pressure
1. Fit pressure test gauges to the inlet pressure test
point and the burner pressure test point.
2. Set the selector switch to the hot water only position
(Fig. 39) and turn any hot water tap fully on and
leave on.
3. Remove the governor sealing screw (Fig. 38a).
4. Adjust the valve for maximum rate to the pressures
shown in the table below by altering the governor
screw (Clockwise for maximum rate increase).
5. Turn off the hot water tap. replace the governor
sealing screw on the pressure adjuster and set the
selector switch to the position required.