13.0
Changing Components
40
The burner and heat exchanger can be changed after
removal of the combustion box door. To change the heat
exchanger, the fan and burner must be removed first (see
section 13.14 & 13.18).
1. Remove the combustion box door by removing the four
securing screws.
13.18
Burner
(Fig. 62)
1. Remove the two screws securing the burner to the base of
the combustion box.
2. Remove the burner carefully from the combustion box
base.
3. Fit the new burner and reassemble in reverse order.
13.19
Heat Exchanger
1. Drain the boiler (see section 13.1 paragraph 2 & 3).
WARNING: The PCB Control and Fan
Assembly is 325 Vdc. Isolate at supply before
access.
2. Remove the fan and condensate trap (see section 13.14
and 13.17).
3. Remove the screws securing the flow switch and return
connections and remove the connections
(Fig. 63).
4. Remove the screws securing the heat exchanger manifold
and remove the manifold (Fig. 64).
5. Lift the heat exchanger assembly (Fig. 65) and rotate the
bottom upwards whilst pulling it forwards out of the airbox.
6. Fit the new heat exchanger and reassemble in reverse
order.
7. Recommission the boiler and check the inhibitor
concentration (see Section 6.2 and 10.1).
Combustion Box
Door Panel
Fig. 64
Fig. 65
Fig. 63
Heat Exchanger
Manifold
Return
Connection
Flow
Switch
Heat Exchanger Assembly
Burner
Securing Screws
Fig. 62
Summary of Contents for System 100 HE Plus
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