L.B. White AW325 - Manual (Page 12)

1. Some models of propane (LP) gas or natural gas
heaters have a throttle valve for varying heat output
located between the gas control valve and gas
manifold assemblies. THIS IS NOT A MANUAL GAS
SHUT OFF VALVE.
2. The throttle valve can be adjusted to deliver either
minimum heat or maximum heat. When the throttle
valve handle is parallel to the gas flow, the valve is
completely open to deliver maximum heat output.
(Refer to Fig. 7.)
The throttle valve may be adjusted to minimum heat
output by turning the handle 90° to gas flow or any
position between maximum and minimum settings.
(Refer to Fig. 8.).
12
Variable Heat Output
THROTTLE
VALVE
GAS
MANIFOLD
GAS CONTROL
VALVE
MAXIMUM HEAT
MINIMUM HEA
T
75% OF MAXIMUM
90% OF MAXIMUM
FIG. 7 FIG. 8