20
Mexico Slimline RS 3/40 & 3/50 -
Installation
24 INITIAL LIGHTING
INST
ALLA
TION
INSTALLATION
8.
Switch the boiler thermostat control knob (H ) to
position 6 and check that the burner cross-lights
smoothly from the pilot flame.
9.
Test for gas soundness around the boiler gas
component joints, using leak detection fluid.
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
. Turn the boiler thermostat knob (H) to OFF.
13.
Remove the pressure gauge and tube. Retighten
the screw in the pressure test point, ensuring that a
gas-tight seal is made.
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.
Wait for 3 minutes
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.
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 unit ignition
H
Boiler thermostat knob
J
Overheat thermostat reset button
(optional)
