Lennox Baltic BCK 020, Installation Operating & Maintenance Manual

Page: 46 / 110

IOM / ROOFTOP BALTIC Series - 0
8
03 - E Page 45
HEATING: gas burner
PRELIMINARY CHECKS BEFORE START-UP
NOTE :
ANY WORK ON THE GAS SYSTEM MUST BE CARRIED OUT
BY QUALIFIED PERSONNEL.
THIS UNIT MUST BE INSTALLED IN ACCORDANCE WITH
LOCAL SAFETY CODES AND REGULATIONS AND CAN
ONLY BE USED IN WELL VENTILLATED AREA.
PLEASE READ CAREFULLY THE MANUFACTURER'S
INSTRUCTIONS BEFORE STARTING A UNIT.
BEFORE COMMISSIONING A UNIT WITH GAZ BURNER, IT
IS MANDATORY TO ENSURE THAT THE GAZ DISTRIBUTION
SYSTEM (type of gas, available pressure…) IS COMPATIBLE
WITH THE ADJUSTMENT AND SETTINGS OF THE UNIT.
Check access and clearance around the unit
- Make sure one can move freely around the unit.
- A minimum one-meter clearance must be left in front of the
burnt gas exhaust flue.
- Combustion air inlet and burnt gas exhaust(s) must Not be
obstructed in any way.
Supply Network Pipe Sizing
MALE THREADED CONNECTION FOR GAZ BURNER: 3/4"
Check that the gas supply line can provide the burners with
the pressure and the gas flow rate necessary to provide the
heating output duty.
- The gas supply to a Rooftop gas unit must be according to
Sound Engineering Practice and the local safety codes and
regulations.
- In any case the pipe-work connected to each Rooftop
must not be smaller than the diameter of the connection on
the Rooftop unit.
- Make sure that a shut-off isolation valve has been installed
before EACH Rooftop.
- Check the supply voltage to the ignition control board (it
must be between 220 and 240V).
STARTING UP THE GAS BURNER
Purge the pipe-work near the connection on the ignition
control Valve for a few seconds.
- Check that the Centrifugal Fan Blower in the unit is
running.
- Set the control to "ON" This will priorities the gas burner.
- Increase the set temperature (room set point temperature)
to a temperature higher than the actual room temperature.
Standard start-up Chronology
1 2 3 4 5 6 7 8 9 1 1 2 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 3 3 4 4
0 1 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 9 9 0 0
8 9 0 1
Time in seconds
Operations
Control operation sequence
Extraction fan
Smoke extraction fan "ON"
30 to 45 seconds pre-Ventilation
Fire-up spark electrode 4s
Opening of the gas valve
"High Heat"
Flame propagation towards
the ionisation probe
If Ionisation within 5sec:
Normal running
Otherwise fault on gas
ignition control block
After 5 minutes, fault reported
on the climatic controller
If incorrect sequence refer to the fault analysis table to identify the problem.
Fig. 53
Table 4
MAXIMUM WORKING PRESSURE: 8bar
MAXIMUM WORKING TEMPERATURE: 125°C