28
Mexico Super 100 FF & 125 FF -
Installation
52 COMMISSIONING AND TESTING
WARNING.
Whilst effecting the required gas soundness test and purging air from the gas installation,
open all windows and doors, extinguish naked lights and
DO NOT SMOKE.
A.
ELECTRICAL INSTALLATION
1.
Checks to ensure electrical safety should be carried
out by a competent person.
2.
ALWAYS carry out preliminary electrical system
checks, i.e. earth continuity, polarity, resistance to
earth and short circuit using a suitable test meter.
B.
GAS INSTALLATION
1.
The whole of the gas installation, including the meter,
MUST be inspected and tested for soundness, and purged
in accordance with the recommendations of BS. 6891.
2.
Purging air from the gas installation may be expedited by
loosening the union on the gas service cock on the boiler
and purging until gas is detected.
3.
Retighten the union and check for gas soundness.
INSTALLATION
53 INITIAL LIGHTING
LEGEND
A.
Gas control valve.
B.
Burner pressure test point.
C.
Main burner pressure
adjuster.
D.
Inlet pressure test point.
E.
Gas service cock.
F.
Sightglass.
G.
Boiler thermostat knob.
H.
Main burner 'On' neon.
J.
Overheat thermostat reset
button (optional).
TO LIGHT THE BOILER
1.
Check that all the drain cocks are closed and any valves in
the flow and return are open.
2.
Check that the gas service cock (E) is OPEN and the boiler
mains on/off switch is OFF.
3.
If the boiler output is to be set to minimum or mid, affix the
appropriate indicator label supplied in the hardware pack to
the data plate.
4.
Slacken the screw in the burner pressure test point (B) and
connect a gas pressure gauge via a flexible tube.
5.
Switch the electricity supply ON and check that all external
controls are calling for heat.
6.
Set the boiler thermostat knob (G) to position 6. The fan will
start. After the fan has run for a few seconds the pilot solenoid
valve should open and the intermittent spark commence,
continuing until the pilot is established. The main burner will
then cross-light smoothly. If this sequence does not occur,
refer to the Fault Finding section.
7.
Test for gas soundness around ALL boiler gas components
using leak detection fluid.
8.
Operate the boiler for 10 minutes to stabilise the burner
temperature.
9.
The boiler is preset at the factory to its highest nominal
rating but can be range rated to suit the system design
requirements. Refer to Table 2 (page 3). Remove the
sealing cap and turn the adjusting screw clockwise to
increase/anticlockwise to decrease the pressure until the
required burner pressure is achieved.
Refit the sealing cap.
10.
Set the boiler mains on/off switch to OFF.
11.
Remove the pressure gauge and tube. Retighten the
sealing screw in the pressure test point.
12.
Turn ON and check for gas soundness at the pressure
test point.
13.
Refit the lower front panel and secure with the 2 fixing
screws.
INST
ALLA
TION
