Gas Burners - Lennox FCM 85 Installation, Operating And Maintenance

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 PLANED INSTALLATION
CONDITIONS FOR OUTDOOR.
PLEASE READ CAREFULLY THE MANUFACTURER'S
INSTRUCTIONS BEFORE STARTING A UNIT.
BEFORE COMMISSIONING A UNIT WITH GAS BURNER,
IT IS MANDATORY TO ENSURE THAT THE GAS
DISTRIBUTION SYSTEM
pressure...) IS COMPATIBLE WITH THE ADJUSTMENT
AND SETTINGS OF THE UNIT.
C
HECK 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.
S
UPPLY NETWORK PIPE SYZING
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.
Number of male threaded connections (3/4")
UNIT SIZE 85 100
S POWER 1 1
H POWER 2 2
Table4 - Standard start-up Chronology
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 5s: Normal running
Otherwise fault on gas ingnition control
block
After 5minutes, fault reported on the
climatic controller
If incorrect sequence refer to the fault analysis table to identify the problem
FLEXYII_WSHP-IOM-0909-E
(type of gas, available
120 150 170 200
1 2 2 2
2 2 2 2
GAS FLOW (for G20 at 20mbar and 15°C) m
UNIT SIZE
S POWER
H POWER
For modulating gas we have just H power for F, G & H-box
- The gas supply of 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.
230
- Check that the unit's treatment "Fan" blower is running.
2
- Set the control to "ON" This will priorities the gas burner.
- Increase the set temperature (room set point temperature) to
2
a temperature higher than the actual room temperature.
85 100 120 150
6.3 6.3 6.3 12.5
12.5 12.5 12.5 18.8
3
/h
170 200 230
12.5 18.8 18.8
18.8 25 25
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