Keston 50 - GC Installation And Servicing Instructions page 47

WD50/2/1997
7.0 GENERAL
The following must always be carried out by a competent/qualified person.
7.1 PRECAUTIONS
i) Always switch off the mains electricity supply and disconnect the plug at the
isolating switch and socket. (If a switch only is used then remove the fuse.)
ii) Gain access to the appliance (Section 7.2) and turn off the gas supply at the
appliance service cock.
7.2 ACCESS
i) Remove the front door by releasing the two slotted screws to the front of the top
panel. The front panel may then be removed by tilting forward and lifting vertically
to disengage the two locating studs in the base of the front panel.
ii) Access to the burner head can be gained by removing the access plate in the top
panel of the appliance.
7.3 REPLACEMENT PROCEDURES
i) Always replace in the reverse order unless otherwise stated.
ii) Electrical connections must be remade in accordance with the Wiring Diagram
(Section 5.5).
iii) Test the soundness of any gas carrying or water carrying joint broken during the
service procedures.
7.4 ELECTRICAL COMPONENTS
7.4.1 On/Off Switch (Fig. 5.7.1 item 115)
i)
ii)
iii)
iv)
v)
vi)
7.4.2 Boiler Thermostat (Fig. 5.7.2 item 64)
i)
ii)
iii)
iv)
v)
Installation & Servicing Instructions
Chapter 7 : Replacement Of Parts
Isolate the appliance (Section 7.1)
Gain access (Section 7.2)
Remove the push on connectors from the switch taking note of the
correct positions.
Press in the catches and push the switch forwards through the control
panel.
Reassemble (Section 7.3)
Check for correct operation of the switch.
Isolate the appliance (Section 7.1)
Gain access (Section 7.2)
Remove the push on connectors from the thermostat taking note of the
correct positions.
Unscrew the two retaining screws and remove the thermostat.
Reassemble (Section 7.3)
NB: When fitting the new thermostat it is a requirement to smear a
thin film of heat sink compound between the thermostat and
plate. This, combined with fitting the new thermostat tightly to the
plate, ensures a good contact.
Page : 44
The Keston 50, 60 & 80 Condensing Boilers