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Eclipse RatioAir v1 - Installation Guide No. 115, 4/7/06
1
Air BV Adjustment
Step2:
Set low fire air
BV shaft shown in
closed position
Air BV Shaft
Air Differential Pressure
1
2
To
Chamber
Tap "C"
Low fire air adjustment procedure:
1.
Start combustion air blower.
2.
Drive control motor to low fire position.
3.
Measure air differential pressure between tap (C ) and
combustion chamber.
Note:
The pressure tap is in the open position when the screw
inside the tap is unscrewed approximately 1/2 turn.
Do not remove screw. Be sure to tighten pressure tap
screw clockwise to the closed position after pressure
measurements have been taken.
4.
Set low fire air.
a.
Loosen the set screw
on burner side of coupling
.
Note:
There is a slot in the end of the BV shaft that is parallel
to the air damper. This slot is used for visual indication of
the BV position. The BV is closed when the shaft slot is
perpendicular to the direction of air flow through the BV.
b.
Rotate air BV shaft to fully closed position. (Holes in
BV damper will supply low fire air.)
Note
When firing into a positive chamber pressure it may be
necessary to rotate the air BV from closed position in
the direction of actuator travel to increase air differential
pressure for reliable ignition.
c.
Hold BV shaft firmly in place and tighten set screw
1
.
Note:
High fire air adjustment is not required if burner is firing
into a neutral pressure chamber and a 90° travel control
motor is used.
It may be necessary to limit control motor stroke to less than
90° if firing into a large positive or negative chamber.
Contact your Eclipse Combustion representative for further
information.
5.
Verify high fire air
a.
Drive control motor to high fire, full open.
b.
Compare the high fire air differential pressure
between tap (C) and the combustion chamber to the
appropriate data sheet chart “Air
∆
P
vs. Air Flow.”
The air differential pressure may be up to 1” w.c.
lower than shown in the chart when the burner is not
firing. If high fire air is insufficient, refer to Section 5,
Troubleshooting and Maintenance, in this document.
6.
Return the control motor to the low fire position.
7.
Close the pressure taps.