1
0
2
3
4
bar
2.28 INITIAL LIGHTING
The boiler incorporates a fan overrun cycle which must not be
interrupted by isolation of electricity supply.
1.
Check that the system has been filled and that the boiler
is not airlocked.
2.
Ensure the automatic air vent cap is OPEN.
3.
Refit the boiler front panel.
Refer to Section
3.4
4.
Check that the drain cock is closed and that the CH and
DHW isolating valves (G,K & J) are OPEN.
5.
Press the Mode button until a cross is shown going
through both tap and radiator icons (boiler off).
6.
Switch the electrical supply OFF.
7.
Check that the gas service cock (I) is OPEN.
8.
Slacken the screw in the inlet pressure test point (H) and
connect a gas pressure gauge via a flexible tube.
9.
Switch the electricity supply ON and check all external
controls are calling for heat.
CENTRAL HEATING
10.
Press the Mode Button (C) until there is no longer a cross
through the Radiator icon. Turn the Central Heating
Temperature Knob (B) clockwise until a target of 80°C is
shown. The boiler control will now go through its ignition
sequence until the burner is established.
11.
If the boiler does not light then after 5 attempts the boiler
will lock out and display “Ignition Lockout”. Press the
Restart Button. The boiler will repeat its ignition sequence.
If Restart occurs 5 times within 15 minutes then “Too Many
Restarts” will be shown.
When the burner is established the flame symbol (E) will
be shown on the display and the current flow temperature
will be shown in the large digits underneath the radiator
symbol.
DOMESTIC HOT WATER
12.
With the boiler firing, rotate the DHW Temp Knob (A)
clockwise until a target of 65°C is shown and fully open
a DHW tap. The boiler should continue to run and the
current DHW temperature will be shown in the large
digits underneath the tap symbol.
13.
Ensure that with the boiler operating, the dynamic gas
pressure is able to obtain maximum output.
Refer to
Table 3
IMPORTANT
The gas input to the burner is
regulated by the gas valve according to the air flow
produced by the fan. It is NOT user-adjustable. Any
interference to sealed settings on the gas valve will
adversely affect operation and render our warranty void.
Refer to Gas Supply
page 10
14
.
Turn off the DHW tap.
15.
Remove gas pressure gauge, tighten inlet pressure test
point and check for gas tightness.
Legend
A. Domestic Hot Water
Temperature Knob
B. Central Heating
Temperature Knob
C. Hot Keys
D. Boiler Status Display
E. Burner On indicator
G. CH Flow Isolating
Valve
H. Gas Inlet Pressure
Test Point
I. Gas Service Cock
J. DHW Inlet Valve
K. CH Return Isolating
Valve
L. DHW Outlet
M. Filling Loop Valve
N. Pressure Gauge
A
D
B
C
1
0
2
3
4
bar
E
Pressure Gauge
1
0
2
3
4
bar
Min
Max
1 bar
2 bar
Target 60°C
Preheat
Menu
Mode
Ready
On
Radiator Target 60°C
Room Thermostat or
Timer Off
On at 60°C
Target 60°C
Preheat
Menu
Mode
Ready
On
Radiator
Target 60°C
Room Thermostat
or Timer Off
On at 60°C
N
Filling
Loop
CH Flow
DHW
Outlet
Gas
Supply
DHW
Inlet
CH
Return
G
L
I
H
M
K
J
CAUTION:
Do not operate the appliance before
it has been fully vented of air. If it is necessary to
operate the pump, do so with the gas service cock
turned off.
33
Installation and Servicing
Section 2 - Installation
INST
ALLA
TION
