4.0 Commissioning
26
Genie S
If the CO
2
requires adjustment this can be done with a
4mm allen key, after having removed the dust cover of
the throttle adjustment screw (see illustration below)
When the heater has been operating for at least 10
minutes check all joints, gas and water, for leaks, and
correct where necessary. Also check for the sound of air
and perform a fi nal vent of the primary system.
For heaters operating on Natural gas: When the heater
is operating at maximum input check that the gas con-
sumption is within 5% of the data plate rating. Refer to
the following table for guidance:
When operating satisfactorily, complete the commission-
ing details on the inside back page of these instructions.
The boiler is fi tted with a syphon trap that includes
a blocked drain detection device. This is to
safeguard the boiler from a blockage or the
possible freezing of the condensate pipe work in
extreme weather.
Should this happen the control will lockout and the display
will show ‘
HI
’, as in “condensate level is high”
(see 5.3 for
more details).
This will have to be corrected before the heater will operate.
The user should be made aware of this feature and, that in
the event of blocked or frozen condensate pipework, the
boiler will automatically stop functioning. It will start again
as soon as the blockage has cleared.
Finally, instruct the user on heaters operation and controls.
4.5 COMMISSIONING THE BURNER
The gas mixture and burner o
ff
-set gas
rate (minimum load rate) is preset by
the manufacturer. DO NOT attempt to
change the settings of the o
ff
-set gov-
ernor behind the sealed cover.
DO NOT REMOVE
THIS COVER
It is recommended that the condensate trap is full of
water before fi ring. If the heater fails to light the gas it
will shutdown and try again. It will repeat this a total of 3
times and then locks out. This will show as the
Red
LED
lit and
‘GAS’
on the display. Press the Lock/Reset button
to start another 3 attempts.
It is possible with the front door off to see when the
burner is lit through the sight glass
After the burner has been lit for a few minutes the gas
rate and combustion should be checked, see the
Tech-
nical Data inside front cover
for CO
2
setting rates..
Briefl y set the pool temperature on the heater to maxi-
mum and operate the heater at maximum output for
around 5 minutes before checking the combustion with a
fl ue gas analyser.
Throttle screw
Flue sample
point
kW
gross
Btu/h
sec/ft
3
m
3
/2 mins
7.5
25,590
145
0.023
12.5
42,650
87
0.039
20
68,240
55
0.062
34.6
108,055
31.5
0.107
52
177,420
21
0.161
Rating Table (38.8Mj/m
3
)
Sight glass
Summary of Contents for MB20S
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Page 32: ...5 0 Fault finding 32 Genie S Fig 11 0 5 4 SCHEMATIC WIRING ...
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Page 40: ...Station Lane Industrial Estate Witney Oxon Tel 01993 778855 Fax 01993 703407 June 2020 Rev J ...
