Chaffoteaux & Maury MINIMA MX2 24 FF NG, Руководство по обслуживанию и ремонту

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4
Heating
1)Turn the CH thermostat clockwise 17.
2) If the room thermostat (if fitted), the
boiler temperature control
and the
clock (if fitted) are all calling for heat, the
orange "burner on" indicator
21 will
light and the heating will be on.
When there is a need for hot water while
the heating is on, it is only necessary to
turn on a hot tap. The heating will be
interrupted momentarily while the hot
water is being delivered. The boiler will
switch back automatically to heating when
the tap is turned off.
Note: if the boiler has been push off for
some time the first attempt to light it may
result in a lockout . If this happens
press the reset button 20 and the boiler
will light.
To put Boiler Off Completely
1) Push the on/off button 15 and the light
is off.
2) Turn the gas tap 4 Fig. 2 OFF.
Domestic Hot Water Mode
In order to supply hot water, the main
switch 15 Fig. 4 must be in ON position I
This will be confirmed by the green light
15 Fig. 4. Turn the selector switch 16
clock .
When a tap or shower is turned on, the
flow of mains water, above 2 litres per
min., will activate the 3 way valve 22 Fig. 5
to move to the DHW position.
The pump will now circulate primary water
heated by the main heat exchanger
through the secondary heat exchanger.
The gas valve 13 Fig. 5 open to allow gas
to the burner. The ignition sequence
begins and a continuous high speed spark
ignites the gas. As soon as a flame is
detected the orange indicator bulb 21
Fig. 4 will light and the modulating
solenoid opens to allow the full gas rate. If
a flame is not detected, after 8 seconds,
the security solenoids close and shut off
the gas. The red lockout indicator bulb
20 Fig. 4 will show. The domestic hot
water temperature is controlled by the
flow and return control thermistor 9- 10
Fig.5. This system anticipates the
changes of temperature in the secondary
heat exchanger and ensures accurate
temperature regulation.
When the tap is closed the burner is
extinguished and the pump stops.
Priority will be given to a demand for hot
water. This will interrupt the central
heating for the duration of hot water
delivery.
Central Heating Mode
To be able to supply heating, the main
button 15 Fig. 4 must be in I position. This
will be confirmed by the green light.
Turn the selector switch 17 clock.
When there is a demand for heating
(either from the room thermostat or the
clock) and the boiler temperature control
is calling for heat. The pump starts
allowing the ignition sequence to begin.
The gas valve 13 Fig. 5 open to allow
gas to the burner. The ignition sequence
begins and a continuous high speed
spark ignites the gas. As soon as a
flame is detected the orange indicator
bulb 21 Fig. 4 will light. After 45
seconds the modulating solenoid opens
to allow the full gas rate. If a flame is not
detected, after 8 seconds, the security
solenoids close and shut off the gas. The
red lockout indicator bulb 20 Fig. 4
will show.
The central heating flow temperature is
controlled by the central heating control
thermistor 9 Fig. 5. The boiler has been
designed to minimise cycling and will not
attempt to relight for 3 minutes after the
boiler thermostat has been satisfied (it is
possible to reduce the time to 30 s if
necessary). When the room thermostat
is satisfied the burner will switch off and
the pump will remain running for a
further 3 minutes before it stops.
NB : it is possible to override the 3 minute
delay by putting off and on the central
heating selector switch 17.
WIRING
DIAGRAM