Combustion Air System - Piper APACHE PA-23-235 Service Manual

PIPER AZTEC SERVICE MANUAL
Figure 13-9. Fuel Control Valve (Cutaway View)
When the shutoff solenoid is closed or de-energized,
no fuel can enter the
standpipe, and the heater is completely shut off. When the shutoff solenoid is
energized, fuel flows through the low heat metering orifice and the heater burns
on low heat.
When both the restriction
and shutoff solenoids are energized, fuel
flows through both the low heat orifice and the restriction orifice, thereby pro-
viding sufficient fuel for high heat operation. After leaving the fuel controlvalve,,
the fuel drips down the standpipe where it saturates
the stainless steel wick ex-
tending into the combustion chamber. (Refer to Figure 13-7.)
13-17. COMBUSTION AIR SYSTEM. The combustionair blower blows air through
the metal elbows into the heat exchanger. Inside the heat exchanger the air passes
through another duct (Refer to Figure 13-7. ) and is blown into the burner cone,
where it mixes with the gasoline vapor and the mixture is ignited by the igniter.
The burning gases then swirl around the heat exchanger and exhaust through the
outlet tube.
HEATING AND VENTILATING SYSTEM
5B24
Reissued: 2/18/81
5B24