Technical data

46
STRATA1
19.3 First Firing (contd)
c) Turn the green potentiometer
(HWS) fully clockwise(60ºC).
d) Attach U tube manometer to inlet
pressure test point on right hand
gas valve (See figure 21)
nominal pressure should be 20mb
for NG or 37mb for LPG.
e) Press the “Engineers” test button
twice - the screen should/must
display “10 min Low”. The
boiler should now ignite and
following stabilisation of the
flame, will turn down to and hold
at minimum output. In the event
that ignition of one or both
burners does not occur after 4
attempts the appliance will go to
ignition failure lockout. Remove
the cover cap screws from Qmin
adjustment on gas valves
(See figure 21 (3)) turn
adjustment screw half turn
clockwise.
Press reset button, appliance will
post purge and vent again.
Press Engineers test button twice
to reset appliance to “10 min
Low” and ignition sequence will
start again. If ignition fails again
after 4 attempts, then further
increase Qmin on each gas valve
by half turn until burners ignite.
f) Observe the colour of both
burner flames - correct colour
should be dull red. Adjust colour
of burner flames using Qmin until
flame colours are correct.
Following this procedure will
avoid poisoning your combustion
analyser.
g) Remove flue gas analysis test
point cap or plug (from top right
of combustion chamber) of the lower heat exchanger and insert probe of combustion analyser.
Adjust as necessary Q min of left hand valve to obtain required CO
2
% value. (See table 1)
Make adjustments slowly and wait at least 2 minutes for reading to stabilise before re-adjusting.
Remove analyser and refit cap/plug to test point. Repeat above procedure with upper heat
exchanger and right hand gas valve.
STATUS
RESET TEST
ECO
ECO
PLUS
4
3
2
1
Control Panel
Fig. 20
Table 1.
Display
Gas Valve
Fig. 21
Q max
Q min
Burner offset
pressure
test point
Gas inlet
pressure test
point
Adjustments
Turning 3 clockwise increases min output & Co
2
%
Turning 4 Anti clockwise increases max output & Co
2
%
ECO/ECO
Plus Switch
On/Off
Switch
Reset
Button
Engineers
Button
Test
Button
Flue gas CO
2
% Settings
Gas Type Nat Gas G20 LPG G31
CO
2
% at min output 9-9.5 11-12
CO
2
% at max output 8.7-9.2 10-11