Logic HE Conventional Flue Combined Controls Installation User Instructions

39
Servicing Instructions - Replacing Parts
7. Mag Unit
7.1 Undo the thermocouple nut, see Diagram 34, 35 or 36,
Arrow B.
B
34
Manual Control
B
35
Remote Control
B
36
Slide Control
7.2 Undo the mag unit retaining nut at the back of the control
valve behind the thermocouple nut.
7.3 After removing the retaining nut, the mag unit can be tapped
out and a replacement fitted:
7.4 Replace the mag unit retaining nut and tighten.
Note - this is a gas-tight seal.
7.5 Replace the thermocouple and check for gas leaks.
7.6 After reassembly, carry out the flame failure functional check
as detailed in the Fault Finding chart, especially the time it
takes for the mag unit to close.
8. Main Injector
8.1 Undo the injector compression nut and valve nut, see
Diagram 37, 38 or 39, Arrows D and E, and pull the pipe
clear of the injector body.
D
E
37
Manual Control
D
E
38
Remote Control
D
E
39
Slide Control
8.2 Rotate the injector until it is fully removed.
8.3 Replace with the correct replacement injector. When
ordering, always state the model, gas type and serial
number.
8.4 Reassemble and turn the gas supply on, check for any
leaks.