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4000123944-2
17 Routine Cleaning and Inspection
9797
97999800
Diagram 17.3
9533
Diagram 17.4
Note: Isolating cocks water and gas are shown in the: OFF position
Diagram 17.2
11927
(f)
BOILER DRAIN VALVE
11900
(e)
(d)
(a)
HEATING
RETURN
COLD
WATER IN
HEATING
FLOW
DOMESTIC HOT
WATER OUT
GAS SERVICE
COCK
To Drain the Domestic hot water circuit
• Close boiler isolating valve (d).
• Turn on one or more hot water taps.
To Drain the boiler
• Close isolating isolating valves (e) and (a).
• Open the boiler drain valve (f).
(b)
(c)
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