13
Eclipse RatioAir v1 Design Guide No. 115, 11/12/2008
Step 4:
Ignition System
(Continued)
Ignition Gas Piping
RatioAirs are capable of ignition with either low fire or bypass start
gas.
Low Fire Start:
Bypass Start Gas (Optional):
An optional fuel orifice meter connected in the start gas piping can
simplify start-up and adjustment. To start the burner at the lowest
possible gas input, select a fuel orifice meter for 5" to 10" w.c.
pressure drop when the gas flow is at the burner’s rated low fire.
The flame monitoring control system consists of two main
components:
Flame Sensor
•
Flame Monitoring Control
•
Flame Sensor
Two types can be used on a RatioAir Burner:
Flame Rod
•
UV scanner
•
Flame rods are available on model RA0025, RA0040, RA0075
and RA0100 burners with alloy or SiC tubes. A flame rod can also
be used on RA0200 burners but with upright left hand piping or
inverted right hand piping configurations only. Further information
can be found in:
Info Guide 832
•
A UV scanner can be used on all RatioAir Burner sizes. Further
information can be found in:
Info Guide 852; 90° UV scanner
•
Info Guide 854; straight UV scanner
•
Instruction Manual 855; solid state UV/IR scanner
•
Info Guide 856; self-check UV scanner
•
Main gas
shut-off
valve train
Main gas
shut-off
valve train
NC
Optional fuel orifice meter recommended.
NC
Step 5:
Flame Monitoring
Control System
Flame Rod
UV Scanner
