PMC MN-06001, Руководство пользователя

Страница: 40 / 66

PMCA-20
Manual
40
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 proportioner and, remove the top and side Cover on 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. Do not loosen
or tighten Thermocouple Body.
2. Disconnect the suspect Heating Rod from the wire connections and test Heating
Rod again for proper electrical resistance. 1250 W Heating Rod is 39.0 ohms.
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 securely 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.
6. Reconnect wire connections and replace the side and top Cover.
7. Ensure Heater is full of material prior to electrical testing.