Supplied By www.heating spares.co Tel. 0161 620 6677
47
12 Servicing
COMBUSTION CHECK AND SETTING GAS
VALVE
● Remove the front casing panel, see diagram 10.1 and hinge
down the control box. Taking care not to touch any internal
components, proceed as follows:
● Connect the CO
2
combustion analyser to the relevant test
point.
While adjusting the burner pressure at maximum and
minimum, combustion products can be checked if required,
according to the table below:
GAS RATE CHECK
The boiler is fitted with a fully modulating automatic gas
valve. With all other gas appliances turned off
measure the gas rate at the gas meter. Check that the gas
rate is as stated in the table below:
Gas rate
Natural gas in (m
3
/ h)
Appliance
Maximum net heat input in kW
nominal
Combustion Products
CO
2
(Vol -%)
CO (ppm)
Appliance
Natural gas
Propane
Natural gas
Propane
Max
Min
Max
Min
Betacom 24c 8,60 ± 5 3,85 ± 5 9,60 ± 5 4,40 ± 5
< 400
< 400
Betacom 30c 8,10 ± 5 2,90 ± 5 9,30 ± 5 3,35 ± 5
< 400
< 400
tolerance
tolerance
tolerance
tolerance
Betacom 24c
Betacom 30c
28,5
25,7
3,02
2,72
COMPLETION
If it is not possible to achieve the required results for either
the combustion or gas rates, it will be necessary to complete
a full service of the appliance and then repeat the combustion
check procedure. If after servicing and adjustment of the
appliance the combustion values are still unacceptable
and after further remedial work has been carried out, the
appliance must be disconnected until the CO/CO2 ratio
is acceptable. Advice can be sought from the Glow-worm
Technical Helpline.
12.1 Servicing
All routine servicing requirements can be achieved by the
removal of the front panel and inner casing panel, see
diagram 12.2.
Before commencing with a service or replacement of parts.
The boiler should be isolated from the electrical and gas
supplies.
● Remove the front casing panel by removing two screws
at the bottom of the boiler and by lifting the front casing
panel up to release from the retaining hooks, see
diagram 10.1.
● Remove the boiler inner casing panel by removing two
screws and by lifting the boiler inner casing panel up to
release from the retaining lugs, see diagram 12.2.
● Remove the side panels by removing the screws on the
upper and lower sides. Remove the panels by swinging
them out and lifting them up, see diagram 12.3.
● Remove the combustion chamber cover by removing six
screws, see diagram 12.4.
Should any CO
2
value exceed the value in the table, investigation of the cause such as cleaning the heat exchanger and checking
the integrity of the flue, must be carried out.
Appliance
Combustion Products
CO
2
(Vol - %)
CO (ppm)
Natural gas
tolerance
Propane
tolerance
Natural gas
tolerance
Propane
tolerance
Max
Min
Max
Min
Betacom 24c
8.60 ± 0.5
3.85 ± 0.5
9.60 ± 0.5
4.40 ± 0.5
< 400
< 400
Betacom 30c
8.10 ± 0.5
2.90 ± 0.5
9.30 ± 0.5
3.35 ± 0.5
< 400
< 400