Commissioning - IDEAL Concord CXDi 120/H Installation And Servicing Manual

19 COMMISSIONING AND TESTING
GENERAL
Check that all drain cocks are closed, that any stop valves fitted
to the flow and return pipes are open and that the system has
been filled and properly vented.
PURGING
Check that the electricity supply is switched OFF.
Extinguish all naked lights and open all doors and windows. DO
NOT SMOKE. Check that the gas supply is turned ON at the meter
and open the main gas inlet cock. Loosen the union and allow air
to be purged from the gas line until gas is smelled. Refer to BS
6891 or IGE-UP-1 for further details. Retighten the union.
20 INITIAL LIGHTING
The Concord CXDi/H incorporates an advanced
microprocessor based control system which operates
all electrical functions of the boiler including automatic
ignition, flame detection, thermostatic control and
high/low burner operation. In addition, the
microprocessor also has onboard commissioning and
servicing instructions and a fault diagnosis
programme.
The next section describes the minimum procedure to
light and commission the boiler. Full operating
instructions for the microprocessor control and details
of the high/low operation system are included in
Frames 25-30.
21 LIGHTING INSTRUCTIONS
1. Check that the gas and electricity supplies to the boiler are
turned OFF.
2. Connect a gas pressure gauge to the inlet pressure test
point. (Frame 23).
3. Turn on the gas and electricity supplies. The display will
initially show a start-up code followed by:
4. Press the [1/0] button. The display will change to:
then change every few seconds to indicate the boiler status.
The boiler will commence its ignition sequence.
5. The boiler should light, initially at low rate, for a period of
approximately 1 minute before proceeding to maximum rate.
If the boiler fails to light, allow the controls to cycle until
ignition is established. If the boiler fails to light after 5
attempts the display will show "Detection Fault". In this case,
Concord CXDi/H -
Installation and Servicing
INSTALLATION
TESTING FOR GAS SOUNDNESS
Close the gas supply cock at the meter.
Remove the screw in the inlet pressure test point, Frames 23/
24, and connect a gas pressure gauge to the test point - take
particular care to ensure a gastight connection. Open the gas
supply cock at the meter and the appliance gas cock; record
the static pressure. Next, close the gas supply cock at the
meter. Wait for 1 minute for temperature stabilisation then
observe the pressure gauge over a period of 2 minutes.
Any leaks must be cured.
Replace all pressure test point screws.
C O N C O R D
CXDi
Up/down
the ignition sequence should be reset by pressing the
[COPY] button. Check that the gas inlet pressure is at least
the minimum value stated in Table 2 when the boiler is firing
at maximum rate (High).
6. Whilst the boiler is warming up, observe the display to
become familiar with its operation. The display changes
automatically between the:
Note that, as the boiler flow temperature approaches the
thermostat setting, the boiler is automatically reduced to low
rate.
This feature is designed to improve overall operating efficiency
and reduce short cycling under low load conditions. The
controls will automatically switch the boiler between high and
low, upon demand.
Display
EXIT COPY ENTER
NO ADV
On/Standby
buttons button
Boiler status and flow temperature
Hours run
Temp set
Programmer status
Enter for menu
Day
Date and time
I
YES II
19