RVR Energy Technology MICROMAT EC 45, Instruction For Usage, Installation & Commissioning, Page: 44 / 56

44
18.3 first
firing
E n e r g y T e c h n o l o g y
Ltd.
NOTES
The MICROMAT EC boiler has 2Nr heat Exchange and
Burner Assemblies. The Lower Assembly is referred to as
No 1 and the upper as No 2. There are two gas valves -
one for each burner: the left hand gas valve serves the
lower assembly (No 1), and the right hand gas valve serves
the upper assembly (No2).
a) Ensure gas & electricity supplies are turned on to
the appliance.
b) Switch on the boiler at the on/off switch. (See figure
20) The appliance will purge both combustion
chambers with air from the burner fans and then
will pulse the pumps on/off (venting) to push away
any air that may be remaining in the heat exchangers.
c) Turn the green potentiometer (HWS) fully clockwise
(60
°
C).
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 C02% 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.
Table 1
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
Control Panel
Fig. 20
Fig. 21
Gas Valve