6
Concord CXDi/H -
Users
This will cause the hours to flash and if the correct ON time
has been entered the [EXIT] button should be pressed. The
display will now show the OFF for time zone one.
This procedure should be repeated for all 3 time zones for
Monday.
After the last [EXIT] the display will ask if this day's
programmes require to be copied to Tuesday. If the [YES]
button is pressed Tuesday's programme will be the same as
Monday. This action can be repeated for all the days or as
many as required,
If the [NO] button is pressed then all 3 time slots will need to
be programmed with the required times.
TEMPERATURE SET POINT
Enables the temperature at which the boiler is required to
operate to be set. It has a range of 60 - 85
o
C.
Using the [UP] or [Down] button select the TEMP SET from
the menu and press [ENTER]. The following will be
displayed:-
with the temperature flashing.
The [UP] and [Down] button should be pressed until the
correct temperature is selected and then the [ENTER] button
should be pressed - the temperature selected will become
stationary.
Pressing the [EXIT] button will ensure that the control
accepts the new setting and return to the menu.
High / Low Operation
In the example above, when the boiler flow temperature is
equal to 82
o
C, the high rate gas valve will close, allowing the
boiler to run at low rate.
When the flow temperature exceeds the set temperature by
3
o
C, in the previous example 85
o
C, the low rate gas valve
will close and the boiler will be off. The information screen
will display :
The boiler will remain OFF for a minimum of 3 minutes or
until the boiler flow temperature has dropped by 3
o
C,
whichever is the greater time.
If the boiler load is such that it cycles between high and low
operation the boiler will fall through 3
0
before the high rate
gas valve is energised.
8 USING THE BOILER FEATURES AND CONTROLS - continued
SET TIME/DATE
Enables the correct time and date to be entered.
The display will show a flashing day of the week as follows :-
The correct day can be selected by use of the [UP] or [Down]
button and when correct the [ENTER] button should be
pressed. The time and date will now be displayed as follows:-
with first two digits, the hours, flashing.
By use of the [UP] or [Down] button the correct hour is
selected and the [ENTER] button pressed. The minutes will
now be flashing and, by use of the [UP] or [DOWN] button, the
correct minutes selected and the [ENTER] button pressed.
This method is repeated until the correct day, month and year
are selected. On selecting the correct year and pressing
[ENTER] the hours will flash then, if all the data is correct, the
[EXIT] button should be pressed for the control to accept this
information.
ADVANCE
Enables the programme to be advanced by one hour.
The following display will be available:-
If the [YES] button is pressed and the programmer is in an
OFF period the boiler will be brought on for one hour, subject
to external controls. If the boiler is ON with less than one hour
to a programmed OFF period then the difference between this
time and one hour is the time of the extended on period. If the
boiler is in the 24 hour mode then this option will have no
effect.
If this advance has been selected, to cancel it the same
procedure should be followed but the [NO] button pressed.
PROGRAMME HOURS
Enables a user-timed programme to be entered.
The following display will be available:-
with the hours, 06, flashing.
Using the [UP] or [DOWN] button, select the correct hour and
press [ENTER]. The
minutes
will now flash and the correct
minutes should be selected, using the [UP] or [DOWN] button
followed by pressing [ENTER].
