Eclipse RatioMatic 50 User Manual page 12

4.0 Start-Up And Adjustment
Step 5: Adjust Low Fire Flame
Step 6: Check Settings & Shut Down
(continued)
Return the control motor to the low fire position.
Check the combustion air differential pressure as discussed in Step 2.
Gas pressure drop across the burner
will be too low to read reliably, but the
flame should be clear blue as shown
on the cover of this manual, entirely
within the firing tube, and tight on the
burner head.
If necessary, adjust the ratio regulator bias
screw as shown below to obtain the proper low fire flame. If the
flame cannot be viewed, adjust the bias screw to produce the mini-
mum gas flow that will generate a steady flame detector signal of
sufficient strength.
After adjusting low fire flame, return to high fire and check gas differential pres-
sure as described in Step 4.
Cycle the burner from high to low several times to check repeatability of settings.
To make it easier to set up and troubleshoot the burner in the future, record your
setup data below.
Do not turn the blower off until the chamber temperature is below 250° F (121°C).
This will prevent hot gases from flowing back through the burner and blower and
damaging them.
Burner Model ______________________
Combustion Air Pressure Drop
between Tap "A" & Chamber, "w.c.
Gas Pressure Drop between
Tap "B" & Chamber, "w.c.
Gas Pressure into
Proportionator, "w.c.
Gas Pressure into
Pilot Gas Cock, "w.c.
Flame Signal
12
Remove Cover & Turn Screw
Clockwise for more low fire gas,
Counterclockwise for less low fire gas.
Low Fire High Fire