41
Henrad SE FF
- Installation
75
HEAT EXCHANGER REPLACEMENT
SERVICING
IMPORTANT. Before starting the removal procedure, protect the gas and
electrical controls with a waterproof sheet or plastic bag.
SER
VICING
Heat exchanger
11
12. Remove the flue thermostat. Refer to Frame 62.
13. Disconnect the boiler flow and return pipes from the system
pipework close to the boiler.
14. Remove the control thermostat phial from its pocket. Refer to
Frame 59.
15. Disconnect the overheat 'stat electrical leads.
16. Undo the flow and return pipe union nuts and pull the pipes clear
of the flow and return bosses.
17. Undo the 4 flow and return boss retaining screws.
18. While supporting the heat exchanger from below, withdraw the
bosses from the flow and return tappings.
If necessary, the bosses may be 'jacked' out by screwing the
retaining screws into the two threaded holes in each flange.
Check the O rings for damage and replace if necessary.
19. Lower the heat exchanger to disengage from the flue connector
tube, and withdraw it from the boiler.
20. Fit the new heat exchanger and re-assemble in reverse order.
IMPORTANT
The flow and return bosses are not common and MUST be refitted in
their correct positions.
The FLOW connection boss has a COARSE thread.
The RETURN connection boss has a FINE thread.
Flow pipe
Return pipe
16
Bosses
Flow
14
Support
Boiler
8
3
Return
18
17
15
Refer also to Frame 10 - 'Boiler exploded view'.
1. Refer to Frame 58.
2. Drain down the system.
3. Drain the heat exchanger via the drain point, taking
care to protect electrical components from water.
4. Remove the fan assembly. Refer to Frame 53.
5. Remove the burner assembly. Refer to Frame 65.
6. Remove the gas injection pipe. Refer to Frame
67.
7. Remove the spark generator. Refer to Frame 64.
8. Remove the back retaining screw.
9. Withdraw the dry fire thermostat phial from its
pocket . Refer to Frame 61.
10. Remove the condensate siphon. Refer to Frame
74.
11. Disconnect the flue gas sampling tube from the top
of the heat exchanger.
Summary of Contents for Henrad SE 30 FF
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