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7
BLOWER ASSEMBLY
The blower assembly functions by pulling in air from outside the
unit to supply to the burner assembly for proper combustion. The
blower pushes the air through the burner assembly and heat
exchanger where the flue gases then exit the exhaust system
assembly, see Figure 8.
FIGURE 8
BLOWER PLENUM
The blower plenum is used to draw air into the blower inlet. The
inlet of the air system must maintain enough height from the ground
to take into account yearly snow levels to prevent possible inlet
vent blockage. The air plenum allows the blower to pull air into the
unit from a higher inlet location to provide protection required, see
Figure 9.
FIGURE 9
HOT RETURN RECIRCULATION PUMP
The hot return recirculation pump circulates the hot water through
the hot water line to eliminate delays at plumbing fixtures, see
Figure 5.
FIGURE 5
DRAIN VALVE
The drain valve is used to drain the water from the tank assembly
and plumbing manifold assembly, see Figure 6.
FIGURE 6
AIR SYSTEM ASSEMBLY
The air system assembly is comprised of the blower assembly,
blower plenum, air hose, and inlet vent terminal. This is where
combustion air is acquired for combustion, see Figure 7.
FIGURE 7