18
Concord CXD -
Installation
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.
Remove the jacket lower front panel.
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 .
The
CXD
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 27-30.
20 INITIAL LIGHTING
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 or 24).
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 it's ignition sequence.
5.
The boiler should light, initially at low rate for a period of
approximately 30 sec 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, the ignition sequence should be reset by pressing the
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 gas-tight 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.
21 LIGHTING INSTRUCTIONS
[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:
Boiler status and flow temperature
Hours run
Temp set
Programmer status
Enter for menu
Day
Date and time
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.
INSTALLATION
INST
ALLA
TION
Содержание Concord CXD 40-100
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