How to Replace the Hot Melt Filter

There is no need to back-flush or clean the filter.

When the filter reaches the end of its service life, it should be replaced. The factors that determine the service life of the filter are:

the type, grade, and purity of the solid-form hot melt

the set point temperature of the tank

the period of time that the hot melt remains in the tank

The filter should also be replaced when making the change to a different type or grade of hot melt.

To determine the optimal service life for the filter, monitor and compare the total number of hours that the heaters are on with observations of:

the purity of the dispensed hot melt

increases in operating pressure

the frequency of gun nozzle replacement or cleaning

As an aid to ensuring that the filter is replaced at the end of its service life, the melter is equipped with a service LED that turns on at the end of a customer-defined time period. You can use this feature to alert you when it is time to change the filter.

When the service LED turns on, replace the filter, and then press the Clear/Reset key to reset the timer and turn off the service LED.

NOTE: The melter must be in the automatic scan mode when you press the Clear/Reset key.

NOTE: Instructions for replacing the filter are also provided on the inside of the pump enclosure door.

Relieve the system pressure by turning off the hot melt tank.

Use a 8 mm hex wrench or an adjustable wrench to loosen (counterclockwise) and then remove the filter.

Properly dispose of the old filter.

Confirm that the O-ring on the new filter is in good condition.

Screw the filter into the pump body and then tighten the filter to 4.5 Nm (40 in.-lb).

Resume normal operation.

Heat the system to operating temperature, and then reduce input air pressure to the pump to zero by adjusting the regulator.

Failure to relieve system pressure can result in serious burns when the applicator filter connection is loosened.

Relieve system hydraulic pressure as described in the melter manual and disconnect and lock out input electrical power.

Insert a 5 mm hex tool into filter top, and rotate it counter clockwise. Remove and discard the filter.

NOTE: Make sure that the replacement filter has the same color ring as the filter being discarded.

Coat the threads of the new filter with Never Seez.

Insert the new filter into the applicator body, and tighten using the 5 mm hex tool to 1.35 - 2.71 Nm (1 - 2 ft‐lbs).

Start the system as described in the melter manual.