Keston 50 - GC Installation And Servicing Instructions page 52

WD50/2/1997 Chapter 7 : Replacement Of Parts
7.11 PRESSURE GAUGE (Fig. 5.7.1 item 119)
i)
ii)
iii)
iv)
v)
vi)
vii)
7.12 SIGHT GLASS (Fig. 5.7.2 item 49)
i)
ii)
iii)
iv)
7.13 HT IGNITION LEAD (Fig 5.7.1 item 120)
i)
ii)
iii)
iv)
7.14 AIR VENT (Fig. 5.7.2 item 72)
i)
ii)
iii)
iv)
v)
vi)
vii)
viii)
7.15 Air Orifice (Fig. 5.7.3 item 87)
i)
ii)
iii)
iv)
v)
vi)
NB:
Installation & Servicing Instructions
Isolate the appliance (Section 7.1) and shut off the boiler from the water circuit.
Gain access (Section 7.2)
Shut off the pressure measurement point at the return drain valve located at the
base of the heat exchanger.
Remove the phial from its mounting at the return pipe entry to the base of the heat
exchanger.
Press in the catches and push the pressure gauge forward through the control
panel.
Reassemble (Section 7.3)
Refill the system (See Section 4 - Commissioning)
Isolate the appliance (Section 7.1)
Gain access (Section 7.2)
Unscrew the sight glass fitting from the burner head.
Reassemble (Section 7.3)
Isolate the appliance (Section 7.1)
Gain access (Section 7.2)
Remove the lead from the electrode and the ignition control box.
Reassemble (Section 7.3)
Isolate the appliance (Section 7.1)
Gain access (Section 7.2)
Shut off the water supply to the appliance.
Gain access (Section 7.2)
Drain the system to below the level of the appliance using the drain off tap at the
base of the heat exchanger.
Unscrew the air vent.
Reassemble (Section 7.3)
Refill the system (See Section 4 - Commissioning)
Isolate the appliance (Section 7.1)
Gain access (Section 7.2)
Disconnect the flexible air intake hose from the air inlet manifold (Fig 5.7.3 item
102)
Unscrew the air orifice grub screw (Fig 5.7.3 item 83) to release the air orifice.
Lift the air orifice from its seat in the air inlet manifold.
Reassemble (Section 7.3)
When replacing the air orifice ensure that the new orifice is seated with the
chamfer facing upwards.
Page : 49
The Keston 50, 60 & 80 Condensing Boilers