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4.4.15 BY-PASS VALVE DISASSEMBLY (C.A.I.-C.S.I. Version)
OPERATION SEQUENCE
15
• Disconnect the boiler from the electricity
supply
• Turn off the gas tap
15.1
Turn off heating system taps
15.2
Remove the case.
See procedure pag. 25
15.3
Empty the heating system
15.4
Take out the circulator.
See procedure pag. 20
15.5
Expel by-pass valve from housing
15.6
Clean by-pass valve housing
15.7
Lubricate and insert new by-pass
valve
Work the other way round from the above for reassembly operations.
! !
MAKE FUNCTIONAL TESTS PAGES 65, 66 and 67.
! !
ITEM INVOLVED
WITH OPERATION
Heating system taps
Safety valve lever
By-pass valve
By-pass valve housing
Lubricated by-pass valve
caldaie
TOOLS NEEDED FOR
THE OPERATION
No tools – by hand
No tools – by hand
No tools – by hand (a finger)
Cleaning rag
Molikote 111 type lubrication
39
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