Lennox MERIT ML180UHE Installation Instructions Manual page 36

ML180UHE BURNER, COMBUSTION AIR INDUCER ASSEMBLY
Flue Transition
Rollout Switches
(−090, −110 −135 units)
Rollout Switches
(−045 and −070 units)
Sensor
ML180UHE NOx INSERTS
NOx Insert
FIGURE 38
CAUTION
Some soaps used for leak detection are corrosive to
certain metals. Carefully rinse piping thoroughly af-
ter leak test has been completed. Do not use
matches, candles, flame or other sources of ignition
to check for gas leaks.
HEAT EXCHANGER REMOVAL
Pressure Switch
Ignitor
Manifold And Gas Valve
FIGURE 37
&
Gasket
Orifice Plate
Collector Box
Combustion Air Inducer
Remove 5 screws if necessary
(either side of cabinet)
Page 36
Heat Exchanger
Retention Rings
Cross Over
1
2
3
4
5
FIGURE 39