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WD420/3/2007
Boilers
iv)
Remove the 4 nuts fixing the burner to the top of the heat exchanger (Fig 6.7.3, item
120).
v)
Remove the spark ignition/flame detection electrode (Section 8.5)
vi)
Withdraw the burner from the top of the heat exchanger.
vii)
Reassemble (Section 8.3)
NB:
8.7
HEAT EXCHANGER (Fig. 6.7.2 - 1/2 item 51)
i)
Isolate the appliance (Section 8.1)
ii)
Gain access (Section 8.2)
iii)
Shut off the water supply to the appliance.
iv)
Remove the burner (Section 8.6)
v)
Drain the system to below the level of the appliance.
vi)
Remove the flue thermistor (Section 8.4.4)
vii)
Remove the spark ignition/flame detection electrode (Section 8.5)
viii)
Remove the flue connection by slackening the retaining strap and pulling the flue off
the heat exchanger spigot.
ix)
Remove the condensate trap (Section 8.8)
x)
Disconnect the flow and return pipe union nuts (Fig 6.7.2 - 1/2 & Fig. 6.7.2 - 2/2 item
85) from the heat exchanger.
xi)
Remove the two screws (Fig. 6.7.2 - 1/2 item 83) fixing the heat exchanger to the top.
xii)
Remove the heat exchanger
xiii)
Reassemble (Section 8.3)
xiv)
Recommission (Section 5 - Commissioning)
8.8
CONDENSATE TRAP (Fig. 6.7.2 - 2/2 item 62)
i)
Isolate the appliance (Section 8.1)
ii)
Gain access (Section 8.2)
Remove the two screws and washers (Fig. 6.7.2 - 2/2 item 103 and 104) fixing the
condensate trap to the base of the cabinet.
iii)
Disconnect the condense line from the projection of the condensate trap from the
base of the cabinet.
iv)
Withdraw the condensate trap.
v)
Mop up any spilled condensate.
vi)
Reassemble (Section 8.3)
NB:
8.9
PUMP (Fig. 6.7.2 - 2/2 item 60)
i)
Isolate the appliance (Section 8.1)
ii)
Gain Access (section 8.2)
iii)
Isolate the waterways to the boiler using the system isolation valves.
iv)
Drain the system to below the level of the appliance.
v)
Undo the screw (Fig. 6.7.1 item 144) to the panel support (Fig. 6.7.4 - item 4) and
rotate it on the right.
vi)
Disconnect the pump electrical cable from the connections box of the pump head
taking note of the correct position.
vii)
Remove the four allen bolts securing the pump head to the hydroblock back body.
viii)
Remove the pump head.
ix)
Reassemble (Section 8.3)
8.10
EXPANSION VESSEL (Fig. 6.7.2 - 2/2 item 98)
i)
Isolate the appliance (Section 8.1)
ii)
Gain Access (section 8.2)
iii)
Isolate the waterways to the pump using the system isolation valves.
iv)
Drain the system to below the level of the appliance.
Installation & Servicing Instructions
Chapter 8 : Replacement Of Parts
When reassembling inspect any gaskets for damage and replace if
necessary.
When reassembling inspect the o-ring (Fig 6.7.2 - 2/2, item 69) for damage
and replace if necessary. When re-fitting the condensate trap pour water until
nearly full. Then reconnect the condensate trap to the base of the heat
exchanger.
The Keston Qudos 28s & Qudos 28sP
Page : 49
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