If the boiler's burner fails to ignite after 3 reset
attempts, re-purge the gas supply, using the inlet
pressure measurement nipple. Otherwise consult
the Atmos Heating Systems.
Ensure that the appliance is functioning
correctly by undertaking the following inspections
and noting the results and work carried out on the
Service Card (located on the front of the boilers
torage tank insulation shells):- s
1.
Visual inspection of the combustion flame.
2.
Measurement of the gas flow rate by stopwatch
& meter.
3.
Measurement of either the O2 or CO2
percentage concentration within the flue gases
by flue gas analysis.
4.
Measurement of the gas inlet pressure.
The procedure required to undertake inspections
1, 2 & 3 are detailed in Section 10 of these
instructions. The procedure for inspection 4 is as
follows:-
The measurement of gas inlet pressure must be
taken during burner operation at maximum heat
input via the measurement nipple provided on the
gas valve. (Fig 29). The gas inlet pressure reading
must be at least 20mbar.
Check the burner's gas rate by stopwatch and
meter. On the maximum input of 24kW or 32kW
(depending on boiler model), the time taken to use
0.024 m³ (0.847 ft³) or 0.032 m³ (1.130 ft³) of gas
respectively should be 33 seconds (± 2seconds.)
When timing 1 ft³ on the meter, the equivalent is 39
secs (24kW) or 29 secs (32kW).
When counting the litres over 2 min period for
metric meter, this is equivalent to 87 litres (24kW)
or 116 litres (32kW).
Set the room thermostat to its minimum setting.
Switch on the hot water heating by pressing the
hot water button. The 'On' indication light will
illuminate. The three-way valve will switch over to
the water heater position and the burner will ignite
to heat the stored domestic hot water. (status report
Code 1
•).
Reset the room thermostat back to the desired
position.
Note!
If during the heating of the stored domestic
water, the room thermostat also makes a
demand for heating, the hot water and central
heating demand will be met simultaneously
(status report Code 4
•).
The following codes may also appear on the
diagnostic display during the commissioning
process:-
(1•) Heat demand water heater
(2•) Heat demand central heating
(3•) Heat demand water heater and
C/heating, priority water heater
heating
(4•) Heat demand water heater and
C/heating, supply to both.
8.4 System balancing.
For efficient boiler operation, the heating system
must be correctly balanced to ensure that all
radiators are heating up evenly and a required temp.
differential of about 20ºC is present between the
boiler's heating flow and return connections.
The required water flow rate through the appliance
is 0·8 m³/h and 1·2 m³/h for the Atmos Multi 24 and
32 models respectively. The maximum permissible
system resistance to enable the boiler pump to
achieve these flow rates is 3·1m and 2·1m
respectively. (Fig 30).
Figure 30: Available pump outputs
ATMOS MULTI Mk 2 version 2004
Page 32
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