49
WARNING! Before performing any maintenance, make sure
the Main Power Switch is OFF and incoming power is locked
OFF. NEVER access the inside of the Control Panel with the
Proportioner power supply ON. The Heaters are components
that reach high temperatures; you must wait until they have
cooled before handling and bleed all material pressure to
zero.
Heating Rod
To replace a defective Heating Rod, proceed as follows:
1. Ensure Main Power Switch is OFF and incoming power is locked OFF. Depressurize the
proportioner and remove the Cover from the Heater.
WARNING! If the Heating Rod to be replaced is the one in
contact with the Thermocouple, it is necessary to remove the
Thermocouple first (see page 48). Do not loosen or tighten
Thermocouple Body.
2. Disconnect the suspect Heating Rod from the wire connections and test Heating Rod for
proper electrical resistance.
*Measurements taken at room temperature.
3. Unscrew the Heating Rod and remove from the Heater Block along with its Spring and
inspect; it must be smooth and shiny in appearance. If it is blackened or has material
adhered to it replace the Heating Rod even if ohm reading is acceptable.
4. Apply Teflon Tape or appropriate Thread Sealant to the Heating Rod thread and
assemble Heating Rod and Spring into the Heater Block. Tighten to 110 ft/lbs (149 N-m).
5. If necessary carefully re-install Thermocouple ensuring positive physical contact with
the Heating Rod. Make sure the Spring does not prevent the Thermocouple from making
contact with the Heating Rod. Tighten Nut with open-end wrench (9/16”).
6. Reconnect wire connections and reinstall Heater Cover.
7. Ensure Heater is full of material prior to electrical testing.
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