24
Concord CXC -
Installation
30 DESCRIPTION AND OPERATION OF BOILER CONTROLS - continued
SERVICING
The SERVICE option is intended as a memory aid to the more
comprehensive servicing instructions to be found in this manual.
Using the [UP] or [DOWN] button select "Service" from the menu
and press [ENTER]. The following display will be available:-
The 2 screens will alternate to display this whole message.
When using this option, arrow keys will be in evidence to indicate
if the [UP] or [DOWN] buttons should be used.
It is IMPORTANT that these instructions are carried out precisely
and in the order displayed.
COMMISSIONING
The "Commissioning" option is intended as a memory aid to
the more comprehensive commissioning instructions to be found
in this manual.
Using the [UP] or [Down] button select "Commissioning" from
the menu and press [ENTER]. The following display will be
available:-
The 2 screens will alternate to display this whole message.
When using this option arrow keys will be in evidence to indicate
if the [UP] or [DOWN] buttons should be used.
It is IMPORTANT that these instructions are carried out precisely
and in the order displayed.
FAULT DIAGNOSIS
In the unlikely event of a fault condition, the microprocessors
will identify the fault area and display a message indicating the
nature of the fault to assist a speedy and effective repair.
See "Fault Finding" section for more details.
If the Advance has been selected, then 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]. 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
o
C - 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 and 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 example above 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.
INSTALLATION
INST
ALLA
TION
Delayed High Rate Gas valve Operation
When the boiler is started from cold the high rate gas valve will
be delayed for thirty seconds and then energised. If the boiler
flow temperature is equal to or greater than 55
o
C then this delay
will NOT occur.
Notes.
1.
If a fault occurs with the boiler thermostat the fault display
screen will show "C/H Sensor Fault".
2.
When the low rate gas valve is de-energised as the
temperature required has been obtained the boiler will go
into an anticycle route for 2 minutes. The display will indicate
anticycle and the current flow temperature.
Summary of Contents for Concord CXC 116
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