Rans Inc.
Section 1
Model S-7LS COURIER
General Information
Revision - B May 8, 2007
1- 9
The instrument panel mounted control knob opens or closes the valves in both heat
control units with a simple mixer simultaneously. The position of the valve determines if
the engine runs on “cool” air coming through the air filter or on “hot” unfiltered air coming
from the heat exchanger.
A spring mounted to each control unit supports the closing of the heat control valve and
assures a fully closed valve when carburetor heat “off “is selected and therefore cool air
supply and maximum engine performance. Reference also Figure 1-3.
Figure 1-3. Carburetor Heat Valve