Keston Thermomatic RSM20/FB, Installation & Servicing Instructions Manual, Page: 23 / 46

Page 23
Fig. 6.7
BURNER
6.16.1 Refer to Sections 6.1, 6.2.1, and 6.4.
6.16.2 Disconnect the union of the gas feed pipe to
the burner pipe (item 54) and take the spring away.
Remove the union at the left side of the gas valve
pipe (item 51).
6.16.3 Gently press off the sealing plate (item 55)
from the burner cover.
6.16.4 Remove four screws, lift the cover a little and
move it lo the left until it is disengaged.
6.16.5 Disconnect the electrode leads.
6.16.6 Remove the two screws A (fig 6.7) and
withdraw the burner.
6.16.7 Transfer the injectors (6.17) and electrodes
(6.18) to the new burner. Ensure that the larger
injector is sited in the center burner bar.
6.16.8 When reassembling, ensure that the two
seals, one under the burner cover and the other on
the sealing plate, are in good condition. Respective
positions of the electrode leads are not important —
the electrodes are interchangeable.
6:17 INJECTORS. ITEM 78.
6.17.1 Remove the burner sections 6.16.1 to 6.16.7
above.
6.17.2 Unscrew the injectors
6.17.3 Refer to 6.16.8 when reassembling. Ensure
the larger injector is fitted in the center burner bar.
6.18 FLAME SENSING AND IGNITION
ELECTRODES, ITME 59
It is recommended that these are replaced as a pair.
16.18.1 Gain access to the burner – 6.16.1 to 6.19.9
6.18.2 Remove the fixing screws of each electrode &
withdraw the electrodes.
6.18.3 Refer to 16.16.8 when reassembling.
6.19 ELECTRONIC CONTROL BOX. ITEM 66.
6.19.1 Disconnect leads.
6.19.2 Remove the 2 control box fixing screws and
remove the box. Replace if required.
6.20
GREEN OPERATING LIGHT, ITEM 71 & RED
LOCKOUT BUTTON.
6.20.1 Refer to Sections 6.1. 6.2.1. 6.2.5 and 6.4.
6.20.2 Disconnect the electrical leads.
6.203 Press in catches & push lamp forward to
remove it
6.21
ON/OFF — SUMMER/WINTER SWITCHES
ITEM 69.
6.21.1 Refer to Sections 6.1. 6.2.5 and 6.4.
6.21.2 Disconnect four leads,
6.21.3 Press in catches and push switch forwards.
6.22
FILLING LOOP, ITEM 39.
6.22.1 Refer to sections 6.1. 6.2 3. 6.3 (Drain CH
circuit of appliance).
6.22.2 Disconnect the filling loop at both ends.