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16
SECTION 6 SERVICING INSTRUCTIONS
6.1
GENERAL
To ensure the continued safe and efficient opera-
tion of the appliance, it is recommended that it is
checked and serviced at regular intervals.
To ensure correct and safe operation of the
appliance, it is essential that any worn or failed
component be replaced only with a genuine
spare part.
The frequency of servicing will depend upon the
particular installation conditions, but in general,
once per year should be adequate.
It is the law that any servicing work is carried out by
competent person such as an engineer, an approved
service agent, British Gas, CORGI registered per-
sonnel or other suitably qualified personnel.
The following instructions apply to the appliance
and its controls, but it should be remembered
that the central heating and the domestic hot
water systems would also require attention from
time to time.
6.2
ROUTINE ANNUAL SERVICING
Check the operation of the appliance and ensure
it functions as described in section 7. Compare
the performance of the appliance with its design
specification. The cause of any noticeable dete-
rioration should be identified and rectified without
delay.
Thoroughly inspect the appliance for signs of
damage or deterioration especially the flue sys-
tem and the electrical apparatus.
Check and adjust - if necessary - all burner
pressure settings (see section 7.3).
Check and adjust - if necessary - the system
design pressure (see section 5.10).
Carry out an analysis of the flue gases (see 7.4)
and visually check the condition of the entire flue
assembly. Compare the results with the appli-
ance design specification. Any deterioration in
performance must be identified and rectified with-
out delay.
Ensure both flue venturis are clean and free from
any debris or obstruction.
Ensure the burner, main heat exchanger and
latent heat collector are clean and free from any
debris or obstruction.
6.3
REPLACEMENT OF COMPONENTS
Although it is anticipated that this appliance will
give years of reliable, trouble free service, the life
span of components will be determined by factors
such as operating conditions and usage. Should
the appliance develop a fault, the fault finding
section will assist in determining which compo-
nent is malfunctioning.
6.4
COMPONENT REMOVAL PROCEDURE
To remove a component, access to the interior of
the appliance is essential. Isolate the appliance
from the electrical supply and remove the fuse.
And when necessary, close all service valves on
the appliance, remove the appliance casing as
described in section 4.7.1 and drain the water
content from the appliance via the drain valve
located at the front of the hydraulic section using
the tube provided. Ensure some water absorbent
cloths are available to catch any residual water
that may drip from the appliance or removed
component. Undertake a complete commission-
ing check as detailed in section 5, after replacing
any component. ALWAYS TEST FOR GAS
SOUNDNESS IF ANY GAS CARRYING COM-
PONENTS HAVE BEEN REMOVED OR DIS-
TURBED.
6.5
PUMP ASSEMBLY fig. 15
Carry out component removal procedure as de-
scribed in 6.4.
The pump head can be replaced by disconnecting
the electrical connection at the pump and removing
the 4-Allen screws that secure the head to the
pump base. Alternatively, the complete pump
assembly can be removed as follows:
●
disconnect the electrical connection from the
pump control box
•
locate and remove the pressure gauge securing
pin and disconnect the pressure gauge from the
pump assembly
•
Refer to fig. 15 and remove items A & B
•
Locate and remove the pump locking pin ‘G’ (it
may be necessary to remove the valve actuator
F to facilitate this) and lift the pump assembly
clear of the hydraulic manifold.
•
Locate and remove the expansion pipe locking
pin, and disconnect the expansion pipe from the
pump assembly
Replace in the reverse order.
6.6
AUTOMATIC AIR RELEASE VALVE fig. 15 (AAV)
Carry out component removal procedure as de-
scribed in 6.4.
Locate and remove the pressure gauge pipe
securing pin and disconnect the pipe from the
pump assembly. Locate and remove the AAV
securing pin (G) and lift the AAV free from the
pump assembly.
Replace in the reverse order.
Fig. 15
AAV
A
B
G
F
