Operation 19
4.
Thermostat Control
— Temperature setting (SV, for Set Value, also sometimes
called the set point) and current temperature (PV, for Present Value) inside the
chamber is displayed.
CAUTION!
When the power is turned on be aware of heat inside of the
tunnel and hot surfaces and moving belts or rollers.
Sequence of Operation
1. If the Main Power Disconnect lever has not been lifted to the On position, turn on
power to the bundling tunnel by lifting the Main Power Disconnect lever to the On
position. (It should not be necessary to turn this lever off and on in the normal day-
to-day operation of the bundling tunnel. See the Special Notes About the Bundling
Tunnel Shutdown Sequence at the end of this section.) The temperature in the
tunnel will be displayed on the thermostat control.
2. Turn the Heater Bank toggle switch below the conveyor speed control dial to the On
position. (This switch also controls all motors.)
3. Set the conveyor speed control at about midrange for initial operation. This can be
fine-tuned later. (Exact desired conveyor speed can be determined later, based on
package size and sealer speed.)
4. Set the temperature controller to the temperature recommended for your shrink-wrap
material. This temperature may need to be adjusted higher or lower until you have
achieved satisfactory shrink sealing. Once the correct temperature for a product has
been set, you should not need to adjust the temperature again as long as you are
running the same product.
5. Adjust the blower speed or chamber ventilation for proper air flow.
6. Turn on the product cooling fan. There is a three-speed selector switch on the
cooling fan. Adjust the cooling fan speed to help shrink the film. (Polyethylene film
shrinks as it cools.
CAUTION!
When shutting down the tunnel, be sure to turn the Heater
Bank toggle switch to Off and wait for the tunnel to cool
down. (Refer to the procedure for setting the cool-down
temperature. Temperature will be displayed on the
thermostat control.) Once cool-down temperature is reached
the conveyor and blower motors will shut down and stop. It
is not necessary to shut off Main Power for normal day-to-
day operation. See the following Special Notes About the
Bundling Tunnel Shutdown Sequence.