RANS S-20 RAVEN
TEXT MANUAL
09/01/2013
03C-03
19.
Assemble the Fan to the Heater Core. The fan will have arrows showing
the direction of airflow and the rotation. Make sure the airflow arrow is
pointing toward the Heater Core. Locate #11 holes in the Fan Mounting
Plate to match Fan mounting holes. Attach the Fan Mounting Plates using
Truss Head Screws. The screws will self-tap into the plastic housing of the
fan. Orientate the fan so the wires come out on the same side as the
Heater Core Nipples. Drill two #30 holes into the Mounting Plate and
Heater Core sides. Rivet with 1/8" Aluminum Rivets.
CAUTION: Be careful
not to drill into the heater core. Use a drill-stop!
Refer to
FIGURE 03C-19
.
20.
Attach the Nipples to the Heater Core.
CAUTION: When working with the
Heater Core, be careful not to over-tighten, or cracking may result. When
tightening the fittings, it is necessary to use a wrench to support the fitting.
21.
Locate the Tees for the heater system. One Tee is located between the
Coolant Pump Inlet and the Radiator Outlet. The second Tee is located in
the Radiator Hose that comes directly out of the Expansion Bottle on top
of the engine.
22.
The Heater Core Assembly may be attached to two brace tubes aft of
Station 1. Place the Heater Core so the fan is blowing air down and back
into the cabin. Check for possible interference with panel instruments and
Rudder Pedals. Use Cushion Clamps to secure to the tubes.
23.
Route Heater Hose from Heater Core fittings to Tees forward of the
firewall.
24.
Locate the Control Valve in the Heater Hose attached to the Tee in the
line coming from the Expansion Bottle. Locate the Valve in a location that
allows connecting of the Control Cable.
IMPORTANT: Make sure you are
installing the Control Valve in the "HOT" side connected to the Expansion
Bottle on top of the engine.
25.
Locate the Control Cable and Fan switch in the instrument panel. Keep
this in mind when planning your instrument panel layout.
26.
Locate a hole in the Firewall and route the Control Cable to the Control
Valve. Trim the control wire after connecting, leaving 2" for adjustments.
Check the control wire and housing for a secure installation. Any
movement of the housing will reduce the travel stroke. If the valve cannot
fully open and close, performance of the heater will be diminished.
27.
After retaining the Control Cable housing in the clamp on the Valve, bend
the wire to retain it to the valve post. It must be bent in a tight loop around
the post. The easiest way is to start to wrap it around, bend it into a hook
shape. Slip it off the post and use a pair of pliers to hold it while
completing the loop with needle-nose pliers. Twist it tight so it fits snug
over the post.