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26 EX17DT and EX22DT Installation and Operation Manual
8. Press the Test Switch twice to enter the
gas code into memory.
The LED display turns blank and the
unit returns to the normal off mode. You
are now ready to program your correct
low fire and high fire gas pressure
setting. Follow the procedure below for
setting the manifold gas pressure. Do
not adjust gas pressure on this furnace
using the screw on top of the gas valve.
9. Press the ON/OFF button to operate the
furnace.
10. Press the Test Switch twice. The LED will
display “PL”.
11. Compare the pressure reading on the
manometer to the desired manifold test
pressure (low) for your gas type and
altitude. If necessary adjust the low fire
pressure using the ▲ and ▼ buttons.
12. Press the Test Switch. The LED will display
“PH” indicating high fire mode.
13. Compare the pressure reading on the
manometer to the desired manifold test
pressure (high) for your gas type and
altitude. If necessary adjust the high fire
pressure using the ▲ and ▼ buttons.
14. Press the ON/OFF button again. The LED
display turns blank and the furnace returns
to the normal OFF mode.
15. Remove manometer and two barb fittings,
and install Allen head screws. Operate the
unit and follow steps A, B, and C below:
A. Check for Gas Leaks at the Test
Points.
B. Check the Normal Operating
Sequence:
When you press the ON/OFF button,
the LED display will illuminate, the
combustion fan will begin to run, and
the spark will ignite the main burner.
This furnace has an automatic ignition
system. When the main burner has lit,
the combustion lamp will glow red,
and the spark will stop.
16. Install the front panel and louver assembly.
17. If doing a gas type conversion, place the
new conversion rating plate (label) on the
front cover.
NORMAL
Flame Rod
Long, clear, blue,
stable flames
Yellow flames or
orange color
ABNORMAL
Flame Rod
C. Visually Inspect the Flame:
Check that the burner flames are
operating normally. The flame can
be seen through the circular window
through the louvers.
When operating normally the burner
flame should appear as long, clear,
blue, stable, streaks. Yellow flames
or an orange color is abnormal and
maintenance is required.
Figure 29: Normal and Abnormal Flames
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