Magnum Venus Plastech CFH-4000 - Manual (Page 8)

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6. Heating Element: If all components to this point check out, heating element is
faulty. Heater element should be checked for leakage to ground and continuity
through element.
CFH-4000-AI Air Interlock units:
7. Air Switch: Disconnect wires and check microswitch to ensure continuity through
normally closed contacts when air supply is off.
If there is no continuity, inspect air actuator to insure it is disengaging. If air actuator
disengages properly, switch is faulty and must be replaced. Next apply air pressure
(at least 30 psi) to air actuator.
Check continuity through normally open contacts. If none, check actuator to insure it
is engaging switch. If not, a small amount of oil may free actuating cylinder or it may
be adjusted if not engaging far enough. If actuator is engaging switch properly but
there is no continuity through normally open contacts, switch is faulty and must be
replaced.
8. Preheat Air Valve / Button: Check that the air valve has a constant air supply,
20psi minimum. Disconnect the outlet air line and make sure that an air signal is sent
when the button is pushed. If no signal air is sent when the button is pushed, check
the valve for blockages and replace as necessary.
Material Flow Blockage and Leakage Problems:
1. If heater is completely blocked, the end caps should be removed and resin
passages thoroughly cleaned. Make sure the passages in the end caps are clean as
well. Fittings into and out of heater should also be cleaned.
2. In case of leakage, check that perimeter end cap bolts are correctly tightened at 60
ft/lb. If so, remove end caps and inspect O-rings, Clean O-ring groove thoroughly.