Technical data

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17 Routine Cleaning and Inspection
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.
17.1 Products of combustion check
Top Flue: 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 17.1.
Rear Flue: To obtain a products of combustion reading, remove
the sampling point cap on the flue spigot, located between the
boiler and the wall, see diagram 17.1.
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.
17.2 Service Check and Preparation.
• Isolate boiler from the gas and electrical supplies.
• (F30E/F35E Only) Drain the Domestic hot water circuit, refer
to diagram 17.2.
Note: Isolating cocks water and gas are shown in the: OFF position
Diagram 17.2
To Drain the Domestic hot water circuit (F30E/F35E Only)
• Close boiler isolating valve (b).
• Turn on one or more hot water taps.
• Open the domestic hot water circuit drain valve.
To Drain the boiler
• Close isolating valves (a) and (c).
• Open the boiler drain valve (f).
F30E/F35E shown
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PRODUCTS
SAMPLING
POINT
Diagram 17.1
SAMPLING
POINT CAP
(f)
BOILER
DRAIN VALVE
(e)
(d)
(a)
HEATING
RETURN
COLD WATER
INLET
(F30E/F35E
Only)
HEATING
FLOW
DOMESTIC HOT
WATER OUTLET
(F30E/F35E
Only)
GAS SERVICE
COCK
(c)
(b)
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