Repair
Repair
Repair Primary
Primary
Primary Heater
Heater
Heater
Replace
Replace
Replace Heater
Heater
Heater Element
Element
Element
1. Follow
Before Beginning Repair, page 52
2. Wait for heaters to cool.
3. Remove heater cover.
4. Disconnect heater element wires
from heater wire connector inside
the electrical enclosure.
See
Electrical Schematics, page 105
. Test
with an ohmmeter.
System
System
System
Total
Total
Total
Heater
Heater
Heater
Wattage
Wattage
Wattage
Element
Element
Element
Ohms
Ohms
Ohms
per
per
per
element
element
element
H-30
10 kW
2,550
18–21
H-30,
H-40,
H-XP2
15 kW
2,550
18–21
H-40,
H-50,
H-XP3
20 kW
2,550
18–21
5. If the RTD is on the heater element, remove
the RTD (512) to avoid damage. See
6. Use a wrench to remove the heater element
(508). Inspect element. It should be
relatively smooth and shiny. Replace
element if there is a crusted, burnt ash-like
material adhered to the element, or if the
sheath shows pitting marks.
7. Install the new heater element (508), holding
the mixer (510) so it does not block the RTD
port. Torque to 120 ft-lb (163 N•m).
8. Install the RTD (512), if removed earlier. See
9. Reconnect the wires inside the electrical
enclosure.
Line
Line
Line Voltage
Voltage
Voltage
The heater outputs its rated wattage at 230 VAC.
Low line voltage will reduce power available and
the heater will not perform at full capacity.
Repair
Repair
Repair Heater
Heater
Heater Overtemperature
Overtemperature
Overtemperature
Switch
Switch
Switch
1. Perform
2. Wait for heaters to cool.
3. Remove heater cover (#10).
4. Disconnect overtemperature switches (509)
from cable (88). Test across spade terminals
with ohmmeter.
a. If the resistance is not approximately 0
ohms, the overtemperature switch (509)
needs to be replaced. Go to step 5.
b. If the resistance is approximately 0
ohms, inspect cable (88) to ensure
it is not cut or open. Reconnect the
overtemperature switch (509) and cable
(88). Disconnect cable from the TCM.
Test from pin 1 to 3 and 1 to 4. If the
resistance is not approximately 0, and
switches are 0, replace cable in place or
original cable.
5. If the switch fails the test, remove the
screws. Discard the failed switch. Apply a
thin layer of thermal compound 110009
and install a new switch (509) in the same
location on housing (501). Secure with
screws (513) and reconnect cables (88).
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