9) For Model’s FW-5B and FW-5D, turn the heat gun temperature control knob clockwise to
increase the air temperature. Each division on the rotary dial increases the air temperature by
approximately 90 degrees Fahrenheit (note: The air temperature increase from “LOW” to position
“1” is greater than the increase in air temperature from position “9” to “HIGH”. The air temperature
at “LOW” is approximately 200 degrees Fahrenheit and at “HIGH” is approximately 950 degrees
Fahrenheit. The FUSION welder heat gun tip which is selected for plastics fabrication will affect
these temperatures. It will take approximately 3 minutes for the FUSION welder to stabilize at the
new temperature setting.
10) Model’s FW-5A and FW-5C set the desired air temperature using the digital process
controller. Press and release the leftmost button on the digital process controller twice. The
display will momentarily show "SP", indicating it is in the set point mode and then display a
number, which is the set point currently programmed into the device. If this is the desired welding
temperature, return the digital process controller to normal operating mode by pressing and
releasing the leftmost button on the digital process controller twice.
Note that the displayed temperature is the air temperature at the threaded end of the heat gun
barrel. The controller set point temperature may need to be set higher or lower (at the controller)
to get the desired air temperature at the weld "puddle" ------ which varies due to environmental
conditions (winter/summer/wind velocity, etc.), the specific welding tip being used and what type
of plastic (PVC, Polypropylene, High Density Polyethylene, etc.) is being welded.
To set the FUSION welder air temperature to a new value, press and release the leftmost button
on the digital process controller twice to put the digital process controller into the set point mode.
Set the desired temperature using the "down key" (the middle button on the digital process
controller) and the "up key" (the rightmost button on the digital process controller). When the
desired temperature setting is displayed, return the digital process controller to normal operating
mode by pressing and releasing the leftmost button on the digital process controller twice. It will
take approximately 3 minutes for the FUSION welder to stabilize at the new temperature setting.
The "HEAT" switch may be on or off during this procedure.
Note that the digital process controller’s indicated air temperature will fluctuate slightly as the
controller varies the heater on/off interval (based on feedback to the digital process controller
temperature sensing circuit). The midpoint between the high and low points of the fluctuation
approximates the programmed set point temperature.
11) The FUSION welder is now ready for welding. Adjust the temperature as needed by repeating
steps “10)” and “11)”. If the FUSION welder heat gun tip needs to be replaced, let the heat gun
cool, per step “14)”, before changing the tip.
The heat gun barrel will get very hot during operation. Do not let it contact heat sensitive
material.
12) When done welding, place the heat gun in a safe position away from heat sensitive materials.
When using Model's FW-5B and FW-5D, it is recommended to turn the heat gun temperature
control knob fully counterclockwise to "LOW".
13) Turn the "HEAT" switch to the “OFF” position. Leave the air flowing through the FUSION
welder for a minimum of 3 minutes while the equipment cools (this action is taken to avoid
unnecessary thermal shocking of the heat gun heater element if the air supply is turned off
suddenly).
