Bosch WORCESTER Greenstar Heatslave II External 12/18 Installation, Commissioning And Servicing Instructions page 45

D
Fig. 89 Baffle location
Re-commission the burner
WARNING: Flue gas leakage.
The seal between the burner and the mounting flange
must form a gas tight seal to prevent leakage of
potentially dangerous gases from the combustion
chamber.
▶ Unless the burner is level when pushing the burner
into the flange the O ring may not seat properly
allowing flue gas to escape!
▶ Always check that the O-ring seal (Fig. 90 item A) is
in good condition before fitting the burner.
Replace the O-ring seal if defective.
Fig. 90 18/25 and 25/32 Burner O-ring seal shown
Refer to figure 91:
1. Align burner combustion head into the boiler collar.
▶ Locate the burner retainer [A] over the threaded lug on the collar [B],
ensure that the burner is level and push the burner firmly onto the
flange ensuring the O-ring seal is fully engaged. Support the burner in
position and secure with the retaining nut [C]. Tighten sufficiently to
hold the burner but do not over tighten.
Greenstar Heatslave II External 2022+ - 6 721 843 980 (2022/01)
F
A
6720821683-25.1Wo
▶ Check that the burner is seated correctly on its mounting flange and
that the oil hose/s are routed correctly as shown in Fig. 40 on page
27 and not trapped in front of or underneath the burner.
1. Refit the flexible air duct and secure with clip [D].
2. Swivel the expansion vessel [F] back into position taking care not to
kink the flexible hose or snag electric cables.
3. Plug the burner lead [G] into the connector [H].
▶ Connect an oil pressure gauge to the oil pump, run the burner and
check the oil pressure is correct for the required boiler output. Check
that the smoke reading is between 0 and 1, if the smoke reading is
above one check the air setting. If the air setting is correct check that
the burner has been reassembled correctly. Allow the boiler to warm
up then check the combustion settings are correct as indicated in
table 9, adjust the CO if necessary using the air shutter. When the
2
combustion is correct turn off the boiler, remove the pressure gauge
and refit the blanking plug and plastic cover.
Refit control box
5. Rotate the box towards you [J].
▶ Slide control box drawer back into position.
Refit panels
6. Refit the top panel [K] and press down to compress the seal when
fitting the securing screws at each corner.
7. Push the front panel [L] up behind the top panel and push in at the
base and secure with the key [N] and latch [M].
Always apply pressure at the edges of the boiler panels
when securing to avoid accidental damage.
After service handover
▶ Make a note of the date of any water treatment.
▶ Set the controls back to the users requirements.
▶ Complete the service interval record at the back of this manual and a
CD11 or an equivalent form.
▶ If the appliance is unused and exposed to freezing conditions; shut
off all the mains supplies, isolate the boiler and drain the system and
boiler, including the secondary heat exchanger.
Service and spares
45