PIPER
SENECA
II
SERVICE
MANUAL
b.
Installation: (Refer
to
Figure 13-19.)
1.
Install the limit switch (25) and spacers (gaskets) (27) by placing them in position in the
heater jacket opening and installing two screws.
2. Tighten screws securely; then reconnect the electrical leads in accordance with markings
made during disassembly. (Refer
to
wiring diagram, Figure 13-7.)
3. Install the cycling switch (24, Figure 13-19) by placing it in position in the heater jacket
opening and securing it with the two screws. Tighten screws securely; then reconnect the electrical leads to
their respective terminals
as
marked during disassembly. (Refer
to
wiring diagram, Figure 13-7 .)
13-39. COMBUSTION AIR PRESSURE
SWITCH.
(Refer
to
Figure 13-18 or 13-19.)
a. Removal:
1.
Disconnect electrical leads from the terminals
of
the combustion air pressure switch (26),
being sure to mark them for proper reassembly. Disconnect the tube from the switch cap. Exercise caution
not
to
exert excessive bending of the tube.
(It
is
"tacked"
to
the combustion chamber inside the jacket.)
2. Unscrew and remove the combustion air pressure switch from the fitting on the combustion
air inlet tube.
b.
Installation:
1.
Install the combustion air pressure switch ( 26)
by
rotating it on the threaded fitting
of
the
combustion air inlet tube and tighten
it
securely. Exercise caution
not
to
over-torque the switch
as
this
could change the setting.
2.
Connect electrical leads to their respective terminals in accordance with markings made
during removal.
If
in doubt regarding proper connections, refer
to
the wiring diagram, Figure 13-6. Connect
the tube to the switch cap.
3. Check for proper heater operation.
13-40. FUEL REGULATOR AND SHUTOFF VALVE. (Refer
to
Figure 13-1.) The fuel regulator and
shutoff valve
is
located below the floor panel between the main and rear spar on the right side
of
the cabin.
It
is enclosed in a special fiberglass box with a removable access panel.
13-41. REMOVAL OF FUEL REGULATOR.
a.
Ascertain
that
the left fuel tanks are
emp~y
and the fuel selector controls are in the OFF
position.
b. Gain access
to
the regulator and disconnect the electrical leads from regulator and shutoff valve.
c.
Disconnect the fuel line from the outlet port and remove the regulator from the heater fuel
pump. Cap
all
open fuel lines
to
prevent contamination.
13-42. ADJUSTMENT OF FUEL REGULATOR. The fuel regulator and shutoff
valve
used in this system
is adjustable
but
not
repairable. The following steps cover the proper adjustment
of
this unit:
a.
Install the regulator in a test stand similar to that shown in Figure 13-14.
b. Install a 2.0 gph nozzle (Janitrol Part No. C08D09). Gasoline or Stoddard solvent can be used for
testing.
c.
Apply fluid pressure from fuel pump and energize the solenoid. Outlet pressure should be 7 .0 ±
.5 psi,
if
not, correct accordingly.
d. Using a screwdriver, break the seal over the adjustment screw and adjust the regulated outlet
pressure
to
7.0 ±
.5
psi. (Turn clockwise
to
increase pressure or counterclockwise
to
decrease pressure.)
e.
De-energize and energize the solenoid at least twice. The outlet pressure should be 6.5
to
7.5 psi
with the solenoid energized. When the solenoid is de-energized, the pressure should drop
to
zero and the
fuel flow from the nozzle should stop.
f.
During the above test, observe for signs
of
external leakage. Any leakage is cause for rejection
of
the regulator. After satisfactory adjustment has been made, apply Glyptol around the threads
of
the
adjustment screw and in the slot.
Reissued: 10/11/79
HEATING
AND
VENTILATING
SYSTEM
2K7
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