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6-22 l Troubleshooting
Replacing the Heaters
Regeneration Heater (continued)
12 Put petroleum jelly on the tips of the new heater wire leads to make it eas-
ier to go through the holes in the back of the control box. Reference the
wiring diagram to re-attach the heater wires and the two snap switch wires.
13 Install the RTD fitting and RTD in the 1/8" (3.18 mm) NPT hole toward the
top of the heater tube.
14 Put the insulation back on. Make sure to duct tape the seam that was cut
during removal.
15 Put the hose barb back in the lower 1/8" (3.18 mm) NPT hole and connect
the plastic hose.
16 Reattach the lower 2-1/2" (63.5 mm) hose and hose clamp.
17 Make sure the heater fuses are not blown before trying the new heater.
2.5"
(63.5mm)
IMPORTANT: The distance the RTD
extends into the heater is critical for
proper functioning. The distance from
the metal heater tube to the outside
surface of the curve on the RTD must
be 2.5
" (63.5 mm) (see photo).To take
the measurement, peel back (but do not
remove) any existing insulation to access
the metal heater tube.