24
Classic
Slimline FF
-
Installation & Servicing
INSTALLATION
44 COMMISSIONING AND TESTING
(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.
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.
(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.
45 INITIAL LIGHTING
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 (B) 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 badge, located on the controls support.
4. Fitting the Boiler Casing
The boiler casing must be refitted with the controls support
casing attached for alignment purposes. Lift the boiler
casing up to the boiler assembly, with the casing top angled
forward. Hook the top edge of the boiler casing into the
channel on the top of the boiler assembly. Swing the bottom
of the casing down and secure with the 2 captive screws.
The casing must seat correctly and compress the sealing
strip to make an airtight joint.
Visually check the side seals but, if side clearances are
limited, then check that the top and bottom edges of the
casing are correctly located.
To gain access to the gas valve:
a.
Remove the controls support casing. Release the controls
support front fixing screws 3 turns only. Remove the pod
by pulling it forward to disengage from the keyhole slots.
b.
Remove the control box securing screws and swing it
down into the servicing position. See diagram B.
5.
Slacken the screw in the burner pressure test point (F) and
connect a gas pressure gauge via a flexible tube.
6.
Swing the control box back into its working position.
7.
Press the overheat thermostat reset button (J).
8.
Switch the electricity supply ON and check that all external
controls are calling for heat.
9.
Set the boiler thermostat knob (D) to position 6 and the
boiler Mains On/Off switch to ON. 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.
10.
Test for gas soundness around ALL boiler gas components
using leak detection fluid.
11.
Operate the for 10 minutes to stabilise the burner
temperature.
12.
The boiler is pre-set at the factory to its highest nominal
rating but can be range rated to suit the system design
requirements. Refer to Table 2 (page 2):
a.
Set the mains On/Off switch to OFF.
b.
Switch the electricity supply OFF.
c.
Swing the control box down into the servicing position.
d.
Remove the main burner adjuster cover.
e.
Turn the adjusting screw
clockwise
to INCREASE the
pressure, or
anticlockwise
to DECREASE the pressure.
f.
Swing the control box back into its working position.
g.
Switch the electricity supply ON.
h.
Set the mains On/Off switch to ON and check the new
setting pressure.
13.
If necessary repeat steps 12a to h until the required
pressure is achieved. Record this value in the Benchmark
log book.
14.
Set the main On/Off switch to OFF.
15.
Switch the electricity supply OFF.
16.
Swing the control box down into the servicing position.
17.
Refit the main burner pressure adjuster cover.
18.
Remove the pressure gauge and tube. Retighten the
sealing screw in the pressure test pint. Ensure a gas tight
seal is made.
LEGEND
A
Sightglass.
B
Gas service cock.
C
Inlet pressure test point.
D
Thermostat knob
E
Main burner pressure adjuster.
F
Burner pressure test point.
H
Boiler mains on/off switch.
J
Overheat thermostat reset
button.
INST
ALLA
TION
