8.
Place the element / holder assembly into the furnace.
9.
Replace the braided contact straps if they show signs of wear. Otherwise, reinstall the used strap.
10.
Pre-form new contact straps to fit the terminals by bending them over an old terminal or some
other 6mm solid round mandrel.
11.
Take care placing the spring clamps onto the contact straps. Keep the ends of adjacent spring
clamps as far away from each other as possible so they do not short out against each other. Do not
torque the element terminals when replacing the clamps.
12.
Replace the top cover.
8. TROUBLESHOOTING
1. The controllers do not turn on when the power switch is turned on.
•
The power cord is not plugged in.
•
The fuse has blown.
• The controller has failed and needs to be replaced.
2. The programmable controller or over temperature controller do not indicate temperature.
• If either controller is flashing oooo then the thermocouple to that controller is broken and
must be either repaired or replaced.
•
Check the control thermocouple and terminal block connections for a loose connection.
•
Check the control thermocouple lead wire at the back of the controller for a loose connection.
3. The furnace does not heat and the HEAT ON indicator (see appendix A #5) does not illuminate.
•
Check that the Heat switch is in the on position which is position l (see appenfix A #4).
• Check that the Over Temperature Controller has been reset by seeing the red OUT LED light
is off.
•
Unplug from the power source. Check the main power fuse inside the controller cabinet by using
an Allen key to remove the side panel. Locate the power fuse on the back wall adjacent to the side
panel and remove with a fuse puller. Measure the fuse with a volt meter for continuity or high
resistance. If the fuse is good the meter will beep for continuity or show a low resistance.
4. The furnace does not heat and the HEAT ON indicator is illuminated.
•
Check that the furnce temperature (PV) displayed in green on the Over-Temperature Controller is
not reading higher than the number displayed in orange (SV) (see appendix A #32 and #33). If the
PV exceeds the SV, one of the following is possible:
-The overtemperature thermocouple is reading falsely hot. Replace the thermocouple.
-The overtemperature SV is set too low and may need to be reprogrammed.
-The furnace is overheated, wait for it to cool.
•
Check that the overtemp controller is reset. If unsure as to whether or not it is reset, try to reset it
again. The OUT light above the <RST button should be off (see appendix A #35).
9
