Heater Electrical System Checks; Electrical Continuity Check - Piper APACHE PA-23-235 Service Manual

i. Connect the cockpit heat and defroster air hoses to the air distribution box.
j.
Place the combustion air blower in position, connect the outlet adapter to
the heater and blower inlet tube. Secure blower in position.
k. Connect the fuel inlet line, and secure the fitting shroud in position.
l. Connect the electrical wires to the heater.
HEATER TERMINAL BLOCK WIRING
Terminal No. Wire Designation
1 H4A
2 H1E H2B
3 H1D
4 H9A
5 H8A H10A
6 H2A
m. Within the baggage compartment, attach the air intake elbow to the front of
the heater.
n. Operate the heater long enough to determine that the unit is operatingprop-
erly.
o. Install the access box in the baggage compartment and panel at the side of
the fuselage.
13-106. HEATER ELECTRICAL SYSTEM CHECKS.
13-107. ELECTRICAL CONTINUITY CHECK. These tests are listed as an aid
in isolating open circuited or inoperative components.
NOTE
The schematic wiring diagram (Figures 13-25, 13-26
and 13-27 shows, in addition to the heater circuitry,
a suggested aircraft control circuit. For the purposes
of this manual, the circuitry shown in these illustra-
tions will be utilized to describe electrical continuity
checks.
It must be assumed that power, which is furnished through the heater cir-
cuit breaker, is present at the HEATER SWITCH at all times. Always check the
HEATING AND VENTILATING SYSTEM
5E9
Reissued: 2/18/81
5E9
PIPER AZTEC SERVICE MANUAL