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Flue Sampling Point
Fig. 41a
Injector Pipe
Injector Pipe Retaining
Screw
14.0Servicing the Boiler
14.2Annual Servicing - Inspection (Cont)
7.To clean the heat exchanger and burner proceed as follows:
a)Disconnect the electrical leads to the fan component protection sensor (Fig. 42).
b)Loosen the screw retaining the gas injector pipe at the venturi (Fig. 42).
c)Undo the two wing nuts to disconnect the fan
(Fig. 42).
d) Remove the fan and disconnect the electrical supply |
to it (Fig. 42). |
e) Remove the gas injector pipe from the gas valve |
|
f) Remove the condensate trap drain plug and place a |
vessel underneath to catch the condensate (care should |
be taken as this could be hot). The condensate drain |
pipe may be removed to increase access. |
Protection
Sensor Leads
Securing Nut
![](/images/new-backgrounds/1055784/5578481xi2.webp)
![](/images/new-backgrounds/1055784/5578481xi3.webp)
![](/images/new-backgrounds/1055784/5578481xi4.webp)
![](/images/new-backgrounds/1055784/5578481xi5.webp)
![](/images/new-backgrounds/1055784/5578481xi6.webp)
Fan
Sensor
Leads
Electrical Supply
g) Undo the condensate trap securing nut, lock nut and |
the condensate drain pipe. Remove the condensate trap |
and disconnect the sensor leads (Fig. 43). Clean the trap |
and refit the drain plug. |
h) Remove the two screws securing the burner and |
remove the burner. Visually inspect the internal burner |
baffle for obstruction, check seal around baffle for |
cracks/damage. Clean with a soft brush. |
|
| Condensate |
Fig. 42 | Wing Nuts | Trap |
|
|
Lock Nut ![](/images/new-backgrounds/1055784/5578481xi9.webp)
![](/images/new-backgrounds/1055784/5578481xi10.webp)
![](/images/new-backgrounds/1055784/5578481xi11.webp)
![](/images/new-backgrounds/1055784/5578481xi12.webp)
Service Drain
Plug
Central Insulation Panel | Trap to Condensate | |
Pump Inlet Pipe | ||
|
Fig. 43
Burner
Combustion
Box Base
Heat Exchanger
Support Bracket
Combustion Box Base
i) Loosen the two screws retaining the heat exchanger |
support bracket and slide to the left to remove |
(Fig. 44). |
j) Remove the four screws securing the heat |
exchanger/combustion box base and withdraw the |
base. |
k) Lower the central insulation panel and check |
condition (Fig. 44). Replace the lower insulation pad if |
necessary. |
l) Ensure the heat exchanger fins are clear of any |
obstruction. |
m) Check condition of all seals. Important: Pay |
particular attention to the condition of the |
combustion box door seals. |
n) Reassemble in reverse order and check for leaks. |
8. | Check the operation of the condensate pump and |
drain pipework (see Section 10.1) | |
9. | Check CO/CO2 ratio at flue sampling point (Fig.41a). |
See section 4.0. |
Burner Securing
Screws
Securing Screws
Fig. 44
10. Complete the relevant Service Interval Record |
section of the Benchmark Commissioning Checklist at |
the rear of this publication and then hand it back to the
© Baxi Heating UK Ltd 2011