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16. Conversion Instructions
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.
Table 9.
Conversion from LPG — NG
LPG — NG Kit No.
Burner Injector
Injector Washer
Bunner Blade Assembly
Table 10.
Conversion from NG — LPG
NG — LPG Kit No.
Burner Injector
Injector Washer
Bunner Blade Assembly
LPG Label
9/14CBi
7 716 192 269
8 716 157 116 (3.4mm)
8 716 101 994
8 716 142 654
9/14CBi
7 716 192 270
8 716 102 407 (2.1mm)
8 716 101 994
8 716 102 408
ZK LAB 147
(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.
14/19CBi
7 716 192 279
8 716 103 168 (3.8mm)
8 716 101 994
8 716 142 653
14/19CBi
7 716 192 277
8 716 103 169 (2.5mm)
8 716 101 994
8 716 102 412
ZK LAB 417
32
19/24CBi
7 716 192 271
8 716 157 115 (4.3mm)
8 716 101 994
8 716 142 653
19/24CBi
7 716 192 272
8 716 102 411 (2.7mm)
8 716 101 994
8 716 102 412
ZK LAB 417
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