19
Mexico Super CF 3/100, 3/125, 3/140 -
Installation
INST
ALLA
TION
INSTALLATION
23 INITIAL LIGHTING
24 PILOT BURNER CONNECTION GAS SOUNDNESS
1.
Turn the gas service cock to OFF and undo the union nut.
2.
Remove the 4 wing nuts and withdraw the burner and controls
assembly, complete, from the boiler.
3.
Invert the burner assembly and reconnect to the gas service
cock.
4.
Turn the gas service cock to ON.
5.
Light the pilot burner. Refer to Frame 23.
6.
Test for gas soundness around the pilot burner connection, using
leak detection fluid.
7.
Turn the gas service cock to OFF and return the burner and
controls assembly to the normal working position.
8.
Switch the boiler thermostat control knob (H ) to
position 6 and check that the burner cross-lights
smoothly from the pilot flame.
Note
.
The pilot burner connection can be tested
for gas soundness. Refer to Frame 24.
9.
Test for gas soundness around the boiler gas
component joints, using leak detection fluid.
1.
Connect the gas valve electrical leads and refit the cover.
2.
Check that the gas service cock (E) is ON and that the
boiler thermostat control knob (H) is OFF.
3.
Loosen the screw in the burner pressure test point (B) and
connect a gas pressure gauge via a flexible tube.
4.
Turn the gas control knob (A) CLOCKWISE until resistance
is felt and then release it..
5.
Push in and retain fully depressed the gas control knob (A).
Press and release the piezo unit button (G) repeatedly until
the pilot is seen to light through the sightglass (F).
6.
Hold the gas control knob (A) depressed for 15 seconds
after the pilot burner has ignited, then release.
If the pilot burner fails to remain alight at this stage, repeat
the procedure detailed above but wait longer than 15
seconds before releasing the gas control knob (A).
7.
Check the appearance of the pilot flame to ensure that it
envelops the tip of the thermocouple and is approximately
25mm (1") long. The pilot flame is factory set and no
adjustment is possible.
10.
Operate the boiler for 10 minutes to stabilise the burner
temperature. The boiler is preset at the factory to its
maximum nominal rating but can be range-rated to suit the
system design requirements. Refer to Table 2, page 3.
If the burner setting pressure requires adjustment, remove
the silver threaded protection cap on the top of the
regulator. Adjust the main burner pressure adjuster (C) until
the required main burner pressure is achieved.
Note.
Continual adjustment in either direction will produce
the opposite effect.
11.
If the boiler output is set to MID or MINIMUM affix the
appropriate indicator label, supplied, to the data plate (front
of baseplate).
12
. Immediately check that there is no spillage of combustion
products from the draught diverter outlets by carrying out a
spillage test as detailed in BS.5440:1.
Note.
This must be done before any building in.
13.
Turn the boiler thermostat knob (H) to OFF.
14.
Remove the pressure gauge and tube. Retighten the
screw in the pressure test point, ensuring that a gas-tight
seal is made.
Boiler controls
LEGEND
A
Gas control knob.
B
Burner pressure test point.
C
Main burner pressure
adjuster.
D
Inlet pressure test point.
E
Gas service cock.
F
Sightglass.
G
Piezo ignition button.
H
Boiler thermostat knob.
J
Overheat thermostat
(optional) reset button.
Summary of Contents for CF#/125
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