Eclipse Combustion AH - Manual (Page 7)

7
Eclipse AirHeat v1.0 - Installation Guide No. 140, 11/4/03
4.0 Start-Up And Adjustment (cont’d.)
Set Air Pressure Drop Measure the air pressure drop across the burner as shown in Figure 7.
Turn the disc on the blower air inlet until the air pressure drop is between 0.4"
w.c. minimum and 1.0" w.c. maximum. For a given input, lower air pressure
drops will produce a longer flame, and higher drops will produce a shorter flame.
Large Burners Only: Some models, such as the 640, 680, and 720 TAH burn-
ers, contain a butterfly valve in the check valve line as shown in Figure 8. On
these models, after setting the air flow as described in the previous paragraph,
measure the air pressure drop between the gas pressure tap and duct as shown
in Figure 7. Gas flow must be off. Adjust the butterfly valve to produce an air
pressure drop of 0.2" w.c.
Start Spark Energize the ignition spark. Do not touch
the ignition rod, ignition wire, or trans-
former while the spark is energized, or
you will get a shock.
Set Pilot Flow Open all pilot gas valves, including the
handle of the pilot cock, Figure 6. The pilot
should light.
Turn the pilot adjusting screw to produce a
bushy blue flame that provides a flame
monitoring signal strong enough to reliably
open the gas shut-off valves.
Set Gas Flow Measure the gas differential pressure as
shown in Figure 7.
With the gas control valve at low fire, open
all main gas valves. The burner should
light with a stable, blue low fire flame that extends evenly down the burner
length.
Drive the control valve to high fire and adjust the gas adjusting valve to produce
a pressure drop that corresponds to the desired high fire rate, as shown in Fig. 1.
When setting high fire, be sure the flame does not impinge on anything down-
stream of the burner. To shorten the flame length for a given gas input, increase
the air pressure drop as described above.
Check All Settings Return the burner to low fire and check to be sure that the burner remains lit with
a stable flame that extends down the burner length. Cycle the burner between
low and high fire several times, checking pressure drops and flame lengths.
5.0 Routine Maintenance
Motor Lubrication Oil the blower motor according to the manufacturer’s instructions as printed on
the motor label.
Ignition Plug/Flame Rod Ignition plugs and flame rods wear out over long periods of normal burner opera-
tion. Eclipse recommends that the user keep at least one of each in stock at all
times to prevent nuisance shutdowns.
Figure 8–Butterfly
in Check Valve Line
Butterfly Valve On
640, 680 & 720
TAH Burners
Check
Valve