30
4000123942-2
REMEMBER, when replacing a part on this appliance, use only
spare parts that you can be assured conform to the safety and
performance specification that we require. Do not use
reconditioned or copy parts that have not been clearly authorised
by Hepworth Heating.
To ensure the continued efficient and safe operation of the
boiler it is recommended that it is checked and serviced at
regular intervals. The frequency of servicing will depend upon
the particular installation conditions and usage, but in general
once a year should be enough.
It is the law that any servicing is carried out by a competant
person.
15.1 Products of combustion check
Note: To obtain a products of combustion reading, unscrew
the left hand sampling point cap on the flue elbow, located on
top of boiler, see diagram 15.1.
Connect the analyser tube onto sampling point.
Refer to the combustion product values in Section 1 Technical
Data.
Switch on the electrical supply and gas supply, then operate
the boiler.
On completion of the test switch off the electrical supply and
the gas supply, remove analyser tube and replace sampling
point cap.
15 Routine Cleaning and Inspection
9532
PRODUCTS
SAMPLING
POINT
Diagram 15.1
15.2 Service Check and Preparation.
• Isolate boiler from the gas and electrical supplies.
• (24ci Only) Drain the Domestic hot water circuit, refer to
diagram 15.2.
• Drain the boiler, refer to diagram 15.2.
• On completion check all gas-carrying parts for soundness
with leak detection fluid.
(f)
BOILER DRAIN VALVE
9839
Note: Isolating cocks water and gas are shown in the: OFF position
Diagram 15.2
To Drain the Domestic hot water circuit (24ci Only)
• Close boiler isolating valve (d).
• Turn on one or more hot water taps.
To Drain the boiler
• Close isolating valves (e) and (a).
• Open the boiler drain valve (f).
(e)
(d)
(a)
HEATING
RETURN
COLD WATER
INLET (24ci Only)
HEATING
FLOW
24ci shown
DOMESTIC HOT
WATER OUTLET
(24ci Only)
GAS SERVICE
COCK
11933
(b)
(c)
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