ATMOS MULTI version 2002
Page 32
revert to raising the hot water temperature above
15ºC (status report Code 3
•
).
Note!
If air is still present in the gas supply, the
boiler's burner may attempt to ignite once or several
times. After four start attempts a flame malfunction
will be indicated (flashing 3
•
). If this occurs, unlock
the control unit by pressing the reset button. The
appliance will now run for the first 3 minutes at the
lowest capacity and will switch to its maximum
capacity until the central heating water temperature
has fallen below 80ºC. The appliance modulates
between 80ºC and 90ºC.
q
If the boiler's burner fails to ignite after 3 reset
attempts, re-purge the gas supply, using the pre -
pressure measurement nipple. Otherwise consult the
Atmos Multi Service Manual.
q
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
storage tank insulation shells:
1. Visual inspection of the combustion flame
2. Measurement of the gas flow rate by watch &
meter.
3.Measurement of either the O
2
or CO
2
percentage
concentration within the flue gases by flue gas
analysis.
4.Measurement of gas pre -pressure
q
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:
v
The measurement of gas pre-pressure must be
taken during burner operation at maximum heat
input via the measurement nipple provided on the
gas valve. (fig 22). The gas pre pressure reading
must be at least 20mbar.
q
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 24
litres or 32 litres of gas respectively should be 33
seconds (± 2seconds.)
Note!
The appliance burner pressure is factory set
and sealed. The burner pressure can only be
measured using precisely calibrated CO
2
or O
2
measuring instruments. If an inaccuracy is found
when checking the appliance gas rate then consult
the separately available Atmos Multi Service
Manual or contact Atmos Heating Systems.
q
Set the room thermostat to its minimum setting.
q
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 the stored domestic hot water. (status report
Code 1
•
).
q
While the stored domestic water is heating,
check that expansion water is entering the tundish
of the discharg e system.
q
Reset the room thermostat back to the desired
position.
8.4 System balancing.
For efficient boiler operation the heating system
must be correctly balanced to ensure that all
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.
Summary of Contents for Multi 24/80
Page 1: ...ATMOS MULTI version 2002 Page 1 ...
Page 2: ...ATMOS MULTI version 2002 Page 2 ...
Page 6: ......
Page 8: ...ATMOS MULTI version 2002 Page 8 ...
