Service Mode - Dimplex System 18 Installation And Servicing Instructions

1 1 0 0 . . 0 0 C C O O M M M M I I S S S S I I O O N N I I N N G G
1 1 0 0 . . 2 2 F F A A C C T T O O R R Y Y S S E E T T T T I I N N G G S S
N N O O T T E E : : This boiler is supplied factory set for operation on
natural gas. No further adjustments of the air/gas ratio
valve or measurement of the combustion performance are
necessary at the time of installation and commissioning.
This is provided the appliance has been installed according
to these instructions and the inlet gas pressure is within
our specification.
1 1 0 0 . . 3 3 I I N N L L E E T T P P R R E E S S S S U U R R E E A A N N D D G G A A S S R R A A T T E E C C H H E E C C K K S S
1. With the boiler firing at maximum gas rate, check that the
inlet pressure at the appliance is 19mbar +/- 1mbar when
measured at the inlet pressure test point (Fig. 44).
To set the boiler to maximum gas rate see section

11.0 (Service Mode).

2. Check the maximum and minimum gas rate at the gas meter
according to the table below using a stopwatch.
G G a a s s R R a a t t e e s s ( ( N N a a t t u u r r a a l l G G a a s s ) ) a a f f t t e e r r 5 5 m m i i n n u u t t e e s s f f r r o o m m c c o o l l d d
B B o o i i l l e e r r M M o o d d e e l l M M a a x x i i m m u u m m R R a a t t e e
m /h
3
S S y y s s t t e e m m 1 1 8 8 1.95
S S y y s s t t e e m m 3 3 0 0 3.2
1 1 0 0 . . 4 4 C C O O M M B B U U S S T T I I O O N N C C H H E E C C K K S S D D U U R R I I N N G G C C O O M M M M I I S S S S I I O O N N I I N N G G
1. On completion of the gas inlet pressure and gas rate checks,
it is necessary to check the following:
• The appliance installation conforms to these instructions.
• The installation and integrity of the full flue system
including the seals in the flue pipes.
• The boiler combustion circuit, including the burner door
seal, combustion door seal.
N N O O T T E E : : If any doubts exist over the above checks then the
combustion of the appliance can be measured as described
in Section 12.0 of these instructions providing;
• The person carrying out the measurement has been
assessed as competent in the use of a flue gas analyser
and the interpretation of the results.
• The flue gas analyser used, meets the requirements of
BS7927 or BS-EN50379-3.
• The flue gas analyser is calibrated in accordance with the
manufacturers requirements.
2. The recorded combustion values should be compared with
the values in Table 1 and Table 2 (see Section 12.2).
3. If the combustion value(s) is outside the values specified in
Section 12.2 (Tables 1 & 2), do not attempt to adjust the
air/gas ratio valve, please ring the helpline number -
0 0 8 8 4 4 4 4 3 3 7 7 1 1 1 1 1 1 2 2 1 1 . . I I f f i i n n d d o o u u b b t t - - A A S S K K . .
M M i i n n i i m m u u m m R R a a t t e e
ft /h m /h ft
3 3 3
68.8 0.57 20.1
113 0.8 28.2
N N O O T T E E : :
Factory set - warranty
void if adjusted
F F i i g g . . 4 4 4 4
/h
Throttle Adjuster Screw
G G a a s s V V a a l l v v e e
Inlet Test Point
© Dimplex Boilers 2008
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