27
Minimiser
-
Installation
INSTALLATION
B. Gas Installation
1.
The whole of the gas installation, including the meter, should be
inspected and tested for soundness and purged in accordance
with the recommendations of BS. 6891.
2.
Purge air from the gas installation by loosening the gas cock
union and purge until gas is smelled.
3.
Retighten the union and test for gas soundness.
45 GAS CONNECTION
47 INITIAL LIGHTING
INST
ALLA
TION
Note.
Boiler is shown with the front panel removed and the controls
drop down door open
J
14.
The boiler is spot rated. Check that the burner pressure
corresponds to the setting given on the data plate, located at the
RHS of the boiler casing. Adjust as necessary via the adjuster
screw (F). Prise aside the plastic cover and turn the screw
CLOCKWISE to
reduce
the pressure or ANTICLOCKWISE to
increase
the pressure. Refit the cover.
15.
Set the thermostat knob (B) to OFF.
16.
Switch the electricity supply OFF.
17.
Remove the pressure gauge and tube. Replace the sealing screw
in the pressure test point. Ensure a gas tight seal is made.
18.
Refit the boiler front and bottom panels, using the screws
previously removed.
19.
Close the controls pod door.
1.
Check that the system has been filled and that the boiler is not air
locked - air in the system could trip the dry fire 'stat (H)
2.
Check that all the drain cocks are closed and any valves in the flow
and return are open.
3.
Check that the electrical supply is OFF.
4.
Check that the flue 'stat (L) is calling for heat - press the reset
button.
5.
Refit the boiler sealing panel - refer to Frame 21.
6.
Check that the gas service cock (C) is ON and that the boiler
thermostat knob (B) is OFF.
7.
Check that the dry fire thermostat (H) and overheat thermostat (J)
are calling for heat - press the reset buttons.
8.
Remove the screw in the burner pressure test point (E) and connect
a gas pressure gauge via a flexible tube.
9.
Switch the electricity supply ON and check that all external controls
are calling for heat.
10.
Set the boiler thermostat knob (B) to position 6. The gas control
solenoid valve should open and the spark commence, continuing
until the burner is established.
11.
Check that the burner lights smoothly and that the 'Burner on' neon
(A) illuminates.
If this does not occur within 10 seconds, turn the thermostat knob to
OFF, wait for 5 seconds then repeat step 10.
If the burner still does not light refer to the 'Fault Finding' section.
12.
Test for gas soundness around ALL boiler gas components, using
leak detection fluid.
13.
Operate the boiler for 20 minutes to stabilise the burner
temperature.
C
A
B
D
H
I
G
F
E
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.
LEGEND
A
'Burner on' neon
B
Thermostat knob
C
Gas service cock
D
Inlet pressure test point
E
Burner pressure test point
F
Burner pressure adjuster
G
Fan pressure test point (Hi)
H
Dry fire thermostat reset button
I
Fan pressure test point (Lo)
J
Overheat thermostat reset button
K
Flue gas sampling point
L
Flue 'stat reset button (behind
sealing panel)
L
K
Refer to Frame 2 for details of the position of the gas onnection.
A MINIMUM working gas pressure of 20 mbar (8" w.g.) must be
available at the boiler inlet with the boiler firing. Refer to Frame
47 or 'Servicing' for details of the pressure test point position.
Extend a gas supply pipe NOT LESS THAN 15mm O.D. to the
boiler and connect to the gas service cock, situated at the
bottom right hand side of the boiler.
The connection MUST be from the RHS rear of the boiler and
from either ABOVE or BELOW.
Do not route the pipe behind the
control box.
A. Electrical Installation
1.
Checks to ensure electrical safety should be carried out by a
competent person.
2.
ALWAYS carry out the preliminary electrical system checks, i.e.
earth continuity, polarity, resistance to earth and short circuit,
using a suitable test meter.
46 COMMISSIONING AND TESTING
Ensure that the gas supply pipe does not foul the boiler casing.
Note.
If the pipe run from the meter to the boiler is greater
than 3m (10') it is recommended that 22mm O.D. pipe is used.
To facilitate connection, it is recommended that the gas service
cock is not removed from the gas control valve.
A 1/2" BSP x 15mm connector, pre-fitted with a short stub
connection, should be screwed into the cock, using a suitable
sealant.
IMPORTANT.
The gas service cock contains a non-metallic
seal so must not be overheated when making capillary
connections.
