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24/28/bi

NOTES

The timer delay can be de-activated by the inser-
tion of a ‘jumper’ on the PCB at JP2 (fig.14) or by
isolating the appliance from the electrical supply
for 30 seconds.
When the request for heating and/or hot water
has been satisfied, the appliance pump and fan
may continue to circulate to dissipate any re-
sidual heat within the appliance.

NOTE

If the spark/sensing electrode does not sense
ignition the appliance will then go to lockout

7.2.5

HEATING PARAMETERS

When the boiler is operating in the SARA range,
the Green LED flashes rapidly to signify the
SARA function is active.

SARA FUNCTION (fig. 12B)

When the heating temperature selector is set
within the SARA range (SARA sector) the boiler
will automatically raise the heating flow outlet
temperature by 5 °C every 20-minutes that the
room thermostat contacts remain in the closed
position or until the boiler reaches the maximum
operating temperature.

7.3

CHECKING AND ADJUSTING BURNER
PRESSURE (see fig. 13)

Although the burner pressure is factory set, it is
necessary to check it during servicing or if the gas
valve has been removed.
Isolate the appliance from the electrical supply
and attach a suitable manometer to the gas valve
outlet test nipple. Remove the compensator tube.

7.3.1

SETTING THE MAXIMUM BURNER PRES-
SURE

Light the boiler as described in 5.6 and compare
the reading on the manometer with the value
described in 2.2. If adjustment is required, re-
move the protective cap from the gas valve
modulating coil assembly and turn the outer
(10mm) nut clockwise to increase, or counter-
clockwise to decrease the burner pressure.

NOTE

You should ensure that all radiators or heat
emitters are fully open during the above proce-
dure. This will ensure that the output of the boiler
(burner pressure) is not compromised due to a
high flow temperature. It may be necessary to fit
a jumper tag to the main PCB (JP2) in order to
cancel the timing function for the 75% output at
start up (see fig. 14).

7.3.2

SETTING THE MIMIMUM BURNER PRES-
SURE

Once the maximum burner pressure has been
checked and/or adjusted, remove one of the grey
wires from the modulating coil. Compare the
reading on the manometer with the value de-
scribed in 2.2. If adjustment is required, turn the
inner (red) cross-head screw clockwise to in-
crease, or counter-clockwise to decrease the
burner pressure, whilst ensuring that the outer
(10mm) nut does not move. When checking and/
or adjustment has been completed, isolate the
appliance from the electrical supply, replace the
protective cap, refit the compensator tube, refit
the grey wire to the modulating coil, remove the
manometer, and tighten the outlet test nipple.

IMPORTANT, A GAS SOUNDNESS CHECK
MUST BE CARRIED OUT.

7.4

COMBUSTION ANALYSIS TEST

A combustion analysis check can easily be car-
ried out on the appliance via the test points
located on the top of the appliance, however you
must check that the burner pressures are set
correctly (see section 7.3).

●

Insert the flue gas analyser probe into the right
hand test point (see fig. 15).

Fig. 12B

RANGE

MINIMUM

MAXIMUM

Temperature (°C)

sector

SARA sector

sector

Fig. 13

Outlet
test nipple