2
1.0 Burner Operating Parameters & Requirements
Do not operate Ratiomatic burners with less gas inlet pressure than the
minimum listed in Figure 1.
Lower gas inlet pressures may cause the proportionator to remain fully
open as the burner turns down from high fire, causing excess fuel opera-
tion and the possible accumulation of unburned fuel in the chamber. In
extreme cases, this may cause explosions or fires.
Chamber Temperatures
Cast Head & Alloy Firing Tube: 1500
°
F. maximum. (816
°
C)
Alloy Head & Refractory Block: 1800
°
F. maximum. (982
°
C)
Temperatures shown are for average installations. Depending on conditions,
higher operating temperatures can be obtained. Contact Eclipse for specific in-
formation for your application.
Capacities & Pressures
See Figure 1.
Process Air Velocity
3000 fpm (15.24 m/s) maximum past the burner.
Electrical
Blower Motor:
Check motor nameplate ratings.
Control Motor:
Check motor nameplate ratings.
Ignition:
6000 volts AC minimum at the ignition plug.
Burner Environment
Ambient Temperature Limits:
As determined by monitoring and control equip-
ment such as UV scanners, automatic fuel shut-off valves and electrical wiring.
Weather Protection:
Protect burners from the weather.
Combustion Air:
Must be free of contaminants. Eclipse strongly recommends
use of a combustion air filter to remove airborne particles. If corrosive fumes or
materials are present in the air, supply the blower with fresh, clean air from an
uncontaminated area of the plant.
Room Openings:
To admit fresh combustion air from outdoors, provide at least
one square inch of opening in the room for every 4000 Btu/hr (1.2 kW) of burner
firing rate.
Access:
Provide access to the burner for inspection and maintenance.
WARNING
15
7.0 Servicing
Blower Motor Replacement
See Figure 5 for blower motor replacement. Replacement motors must have the
same nameplate ratings as the original motor.
Filter Element Replacement
See Figure 6 for filter element replacement.
Spark Plug & Flame Rod Replacement
Ignition plugs and flame rods wear out over long periods of normal burner opera-
tion. For Ratiomatic burners, the part number used as the ignition plug is the same
as that used for the flame rod. Eclipse recommends that the user keep at least
one of these in stock at all times to prevent nuisance shutdowns. See Figure 7
for plug and rod replacement.
Figure 7–Ignition Plug & Flame Rod Replacement
The ignition plug and flame rod for sizes 50 through 600
are identical parts:
• Sizes 50 thru 200:
#13581 for burners fitted with alloy tubes
#13837 for burners fitted with refractory blocks
• Sizes 300 thru 600:
#13581 for burners with tube or block
To remove them:
1. Unscrew the electrode nut and draw the electrode with
insulators out of the burner housing.
To replace them:
1. Loosen the packing nut.
2. Insert the electrode with insulators through the threaded
connection on the back of the housing and slide the
captive insulator into the guide cup in the burner head
until the insulator bottoms out.
3. Tighten the electrode nut into the burner housing.
4. Tighten the packing nut.
The ignition rod for sizes over 600 are as follows:
Ignition rod:
#150000-5 for 750 through 1250 sizes
#150000-12 for 1500 through 2500 sizes
To remove it:
1. Loosen the compression fitting and draw the electrode
out of the burner housing.
To replace it:
1. Insert the electrode through the fitting and through the hole
in the nozzle cone.
2. Be sure the rod extends through the nozzle so that the
spark occurs in front of, or to the oven side of the nozzle.
If the spark occurs behind the nozzle, the pilot gas may
not ignite and may accumulate to dangerous levels after
several unsuccessful trials for ignition.
3. Tighten the compression fitting. Do not over-tighten, or you
may crack the ceramic insulator and ruin the ignition rod.
Slide Rod
Through Hole
In Cone
Loosen
Compression
Fitting
Ignition
Rod
Packing
Nut
Electrode
Nut
Insulator
Electrode
Rear
Burner Casting
Nozzle
Captive
Insulator
Guide Cup
50 through 600 Sizes
750 through 2500 Sizes
