IOM / ROOFTOP BALTIC Series - 0704-E Page 69
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 INSTRUC-
TIONS 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 nominal output .
Male threaded connection for Gaz Burner: 3/4"
GAS FLOW (for G20 at 20 mbar and 15°C) m
3
/h
For modulating gas we have just H power for C, D & E-box
- The gas supply to a Rooftop gas unit must be realized
according to Sound Engineering Practice and the local
safety codes and rules.
- In any case the diameter of 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 exit of the power supply's
transformer T3 of the burner: 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 unit's treatment "Fan" blower 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.
Table 4 - Standard start-up Chronology
If incorrect sequence refer to the fault analysis table to identify the problem.
UNIT SIZE 20 25 30 35 40 45 50 60 70
S POWER 2 2 2 23335,75,7
H POWER 3 3 5 566611,511,5
UNIT SIZE 20 25 30 35 40 45 50 60 70
S POWER 1 1 1111111
H POWER 1 1 1111122
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
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