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Troubleshooting l 6-23
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6
Troubleshooting
Replacing the Heater
Process Heater
1
Disconnect and lockout the main power.
2 Gain access to the process heater by
removing the left dryer side panel.
3 Open the electrical enclosure door.
For D15, D25, and D50 Dryers
4 Remove the hose and hose clamp at the bottom of the heater tube.
5 Remove the insulation from the heater tube by cutting the insulation in a
straight line from top to bottom.
6 Reference the wiring diagram and / or trace the wires from the process
heater tube into the control box. Remove the wires from the relays and ter-
minal strips. Once disconnected, pull the wires from the control box into
the dryer housing toward the heater tube.
7 Remove the heater tube by twisting the tube counterclockwise. The
tube is threaded into the lower bed plate. You may need to use a pipe
wrench or chain wrench to remove the heater.
8 Remove the plugs or hose fittings toward the top end of the heater. These
will need to be installed on the new heater.
9 Check the ID mark on the side of the heater tube for kW rating and volt-
age. The ID mark is on the outside of the tube near the end with the lead
wires. Make sure the kW and voltage is the same as the replacement heater.
10 Reinstall the plugs or hose fittings into the 1/8" (3.18 mm) NPT holes
near the top end of the heater tube.
11 Thread the new heater into the lower bed plate. The lead wires should
be pointing toward the inside of the dryer. Do not over tighten. Hand tight-
en then use a wrench for no more than one turn to put the lead wires into
the correct position.
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TIP: Depending on the model and
the mounting configuration selected
for the dryer installation, it may be
necessary to access the process
heater through the right side panel
or to remove the process blower to
create adequate access to use a
wrench to remove the process
heater. See Removing the Process
Blower.
Note: When installed,
the process heater
tube must be oriented
so the power wires are
toward the inside of
the dryer.
Central
When configured as a
central dryer, there is no
process heater in the sys-
tem. Therefore, replac-
ing the process heater is
not applicable.