20
310530
Service
Replacing Heater Bands and Sensors in
Pump-Module
Module heaters and sensor can be serviced without
removing pump module from supply unit. Remove
front shrouds and pump insulation. When finished
servicing pump module, rewrap pump in new insulation
and re-attach shrouds.
Fig. 11
G
H
I
J
Removing/Replacing Heater Band
1.
Unscrew screws that hold front shroud in place,
then remove front shroud.
2.
Remove pump’s insulation.
3.
Disconnect electrical wires from heater band.
4.
Unscrew screw that holds heater band in place.
5.
Remove heater band from pump.
6.
Fig. 11. Install new heater band in same location
as old heater band:
a.
Locate heater terminals (G) so they line up
with back of pump (J).
b.
Tighten heater band.
7.
Re-connect heater wires and re-attach ceramic
caps that insulate terminal.
NOTE:
On TOF Plus machines (all machines
manufactured after June 2000), the heaters are not
identical. The upper heater is 1000 watts and the lower
heater is 500 watts. These heaters also have 3 wiring
lugs, instead of two. Always replace the heaters with
identical units.
Removing/Replacing Sensor
1.
Unscrew screws that hold front shroud in place,
then remove front shroud.
2.
Remove pump’s insulation.
3.
If sensor wire is connected to junction box, discon-
nect it now.
4.
Loosen clamp holding sensor on pump.
5.
Remove sensor.
6.
Fig. 11. Replace sensor (H) in clamp:
a.
Coat sensor and mounting surface of sensor
block with non-silicone heat sink compound.
b.
Place sensor approximately 30
°
counter clock-
wise from pump outlet (I).
c.
Tighten clamp.
7.
Re-connect sensor wire to junction box.
Inspection/Maintenance Frequency
The pump packings do not require any other service or
maintenance, except as described in the
Daily Mainte-
nance Procedures
. See 308570 for inspection fre-
quency of the pump.
Throat Packings
The pump throat packings are available as a preas-
sembled, prelubricated kit. For series B pumps, order
Part No. 241782. For series A pumps order Part No.
237905. Refer to manual 308570 for replacement
instructions.
