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46 INITIAL LIGHTING - continued
If ignition does not occur within 8 seconds or if the burner
lights and flame presence is not detected then the
ignition sequence is repeated for a maximum of 5 times.
If ignition is still unsuccessful the display flashes:
indicating a FAULT mode, and the boiler will shut down.
Press the RESET button to return the boiler to STANDBY
mode and the ignition sequence will be repeated.
If the boiler again locks out refer to the Fault -Finding
section.
13. Check that the burner lights smoothly and that sequence
number :
is displayed, indicating that central heating is being
supplied.
Note.
Sequence Number 4 will first show until the DHW preheat is
satisfied. The burner will reduce to minimum rate for a few
seconds before increasing to maximum rate.
14. Test for gas soundness around ALL boiler gas
components, using leak detection fluid.
15. Operate the boiler for 20 minutes to stabilise the burner
temperature.
16. The boiler central heating control is fully modulating,
operating between burner pressures of:
13.0 mbar
(± 0.2 mbar)
2.0 mbar
(± 0.2 mbar )
These are factory set.
To check the maximum pressure
Remove the controls button cover plate (O). Select TEST
mode by pressing MODE and ' + ' buttons
47 DOMESTIC HOT WATER FLOW RATE SETTING
1.
Fully open all DHW taps, in turn, and ensure that
water flows freely from them.
2.
Close all taps except the furthest one from the boiler
and check that the boiler is firing at maximum rate.
3.
Release the boiler bottom panel.
4.
Turn the DHW flow regulator clockwise to reduce the
DHW flow rate until a DHW temperature of
o
approximately 35
C rise is obtained at the tap. This
corresponds to a flow rate of about 10 l/min.
5.
Turn off the DHW tap and switch OFF the electricity
supply.
Henrad SEC FF -
Installation
INSTALLATION
continuously,
MAXIMUM
MINIMUM
simultaneously (to simulate a call for maximum heat).
The display will read:
To check the minimum pressure
Select TEST mode by pressing MODE and ' - ' buttons
simultaneously (to simulate a call for minimum heat).
The display will read:
17. To check the fan pressure signal
Connect a suitable pressure gauge to the pressure
tappings (E) and (F) on the gas valve.
Equilibrium fan pressures should be as follows (± 0.2
mbar):
Boiler size
Fan pressure mbar (ins. wg.) 300mm flue
kW (Btu)
Max
24 (81 900)
3.5 (1.4)
This will reduce within acceptable levels up to 3m flue (ref
only)
18. To return the boiler to normal running STANDBY mode,
press + and - buttons simultaneously.
19. With the burner firing as above at maximum rate, fully open
a DHW tap: -
a. The pump should continue to run.
b. The burner pressure should remain at maximum
setting.
c. The diverter valve should change over to circulate water
to the DHW calorifier.
d. Check that the sequence number:
is displayed, indicating that DHW is being supplied (the
last 2 digits still show the boiler flow temperature).
The DHW control is also fully modulating down to a
minimum pressure of 2.0 mbar (± 0.2 mbar). Check this
by reducing the DHW draw-off.
These pressures are also factory set.
Min
0.5 (0.24)
35
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