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These instructions should only be read if converting appliance
from Natural Gas to LPG or vice versa.
Only components supplied by Worcester, Bosch Group should be
used.
Only competent persons should attempt the conversion.
Conversion from Natural Gas to LPG should not be carried out
on appliances installed in a room or internal space below
ground level.
Turn off the gas and electricity supplies to the boiler.
NOTE: Turning the control knob to off does not isolate the boiler.
16.1 Conversion
(I) Remove the outer casing by loosening the fixing screw at
the base and lifting off. Refer to Fig. 12a/b.
(II) Remove the inner casing door and combustion chamber
front. Refer to Section 14.3.
(III) Lower the base/control assembly. Refer to Section 14.3.
(IV) Remove the burner blade assemby. Refer to Section 14.3.
(V) Unscrew and replace the burner injector and washer with
the new one from the kit. Refer to Tables 9 and10.
(VI) Transfer the spark and flame electrode assemblies to the
new burner blade assembly. Refer to Sections 15.4.2 - 4 for
details of positions.
(VII) Fit the new burner blade assembly into the appliance not
forgetting to re-connect the electrode leads.
(VIII) Refit the combustion chamber front and inner case cover.
(IX) Switch on the gas supply and open the gas cock at the
appliance. Check for leaks at the gas valve inlet.
(X) Refit the base control assembly.
(XI) Recommission the appliance.
Refer to Section 12. Commissioning for details.
Adjust the burner setting pressure as required. Refer to
Table 1 and Fig. 31.
(XII) Fix the Red Arrow on the data plate to show the boiler
setting. If the setting has been altered the adjustment
screw should be resealed by a dab of paint to stop un-
authorized adjustment.
(XIII) If converting to an LPG boiler add LPG sticker to the casing
door. If converting from LPG to NG then remove the LPG
sticker from the casing door.
(XIV) Refit the cabinet casing.
(XV) Complete the Benchmark checklist.
32
16. Conversion Instructions
9/14CBi 14/19CBi 19/24CBi
LPG — NG Kit No. 7 716 192 269 7 716 192 279 7 716 192 271
Burner Injector 8 716 157 116 (3.4mm) 8 716 103 168 (3.8mm) 8 716 157 115 (4.3mm)
Injector Washer 8 716 101 994 8 716 101 994 8 716 101 994
Bunner Blade Assembly 8 716 142 654 8 716 142 653 8 716 142 653
9/14CBi 14/19CBi 19/24CBi
NG — LPG Kit No. 7 716 192 270 7 716 192 277 7 716 192 272
Burner Injector 8 716 102 407 (2.1mm) 8 716 103 169 (2.5mm) 8 716 102 411 (2.7mm)
Injector Washer 8 716 101 994 8 716 101 994 8 716 101 994
Bunner Blade Assembly 8 716 102 408 8 716 102 412 8 716 102 412
LPG Label ZK LAB 147 ZK LAB 417 ZK LAB 417
Table 9. Conversion from LPG — NG
Table 10. Conversion from NG — LPG