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USE
ONLY
FACTORY
REPLACEMENT PARTS AND PROCEDURES.
COMPONENTS FOR REPLACEMENT PARTS
INCLUDE THE SWITCHES AND THE THERMAL
ASSEMBLIES ONLY. ORDER PARTS BY NAME
PLATE INFORMATION ON MODEL, RANGE AND
ELECTRICAL RATING.
REPLACEMENT OF SWITCHES
Types B121, C120, E121 & F120
1)
Remove cover, (2) switch mounting screws,
switch and insulator.
2)
Disconnect (3) switch wires at switch
terminal.
3)
Install new switch and wire per Figure 3.
4)
Mount switch and insulator inside
enclosure and recalibrate per PART II.
Types B122 and E122
SWITCHES ARE DIFFERENTIATED FOR
REPLACEMENT PURPOSES AND MUST BE
INSTALLED ACCORDING TO PROCEDURE
BELOW. FRONT (TOP) SWITCH HAS A WHITE
IDENTIFICATION MARK WHICH IS VISIBLE
THROUGH THE INSULATOR WHEN SWITCHES
ARE PROPERLY INSTALLED. IF IT IS NOT VISI-
BLE AFTER INSTALLATION, CHECK REPLACE-
MENT PROCEDURE.
NOTE: Switch characteristics between front and rear
switches differ in order to maintain consistent control
differential. Replace only with original switch type.
1)
Remove cover, unscrew (4) terminal
block mounting screws and remove switch
and insulator.
2)
Unhook extension spring from conduit wire
guide and remove wire guide.
3)
Remove (2) switch mounting screws,
switch and insulator.
4)
Loosen (2) set screws on low set adjusting knob.
5)
Turn low set adjusting screw counter-clock
wise until switch bracket and actuating
lever assembly can be removed. (Be
sure that extension spring is on
bracket and washer is on plunger.)
6)
Unscrew (2) bias plate screws and
remove bias plate.
7)
Remove (2) switch mounting screws, switch
and insulator.
8)
Disconnect (6) wires at switch terminals.
9)
Assemble new switches and insulators,
mounting one switch to switch bracket and
lever assembly.
10) Replace bias plate with flat edge facing
conduit and slot facing sensor assembly.
11) Position switch bracket and lever assembly
so that fingers of lever are on top of washer,
and turn low set adjustment screw clock
wise until lever actuates switch.
12) Hook extension spring onto wire guide
and replace terminal block insulator.
13) Tighten set screws and install terminal
blocks. Wire per Figure 3.
14) Recalibrate per PART II.
15) Replace cover.
AUTHORIZED
Type E122P (Dual Switch Models)
1)
Remove cover, unscrew and remove
terminal blocks and insulator, letting
terminal blocks hang.
2)
Unscrew terminal block supports
and remove (2) switch mounting screws
and washers.
3)
Lift out dual switch bank and actuating
lever assembly.
4)
Disconnect (6) wires at switch terminals.
5)
Assemble new switches and insulators to
the switch bank assembly.
6)
Connect wires at the switch terminals.
7)
Install switch bank assembly, terminal
block supports, insulator and terminal block
in control.
8)
Adjust temperature setting per Part II.
REPLACEMENT OF
THERMAL ASSEMBLY
1 1/8" Open/Adjustable Wrench
Types E121, E122, E122P and F120
1)
Place control upside down on work bench.
2)
Loosen 3/8" hex dress nut one or two turns
to relieve tension on 1 1/8"hex Thermal
Assembly (TA) mounting nut.
3)
Unscrew TA mounting nut from TA housing
and carefully remove thermal assembly
insuring that "cone" spring and compensator
assembly remain in TA housing.
4)
Insert new TA, seating bellows stem into
cone spring and compensator assembly.
5)
Screw on TA mounting screw and screw
on "dress" nut snugly. Do not over-tighten.
6)
Recalibrate per PART II.
Types B121, B122, and C120
1/4" Open or Spin Tight Wrench
1)
Remove old sensor and housing by
unscrewing (4)1/4" hex mounting screws.
Retain plunger, spring guide and
load spring.
2)
Unthread sensor from housing while rigidly
supporting housing.
3)
Attach new sensor to housing (using a drop
of 3201 Loctite) by screwing together until
fully seated (hand tighten only).
4)
Insert plunger (pointed and exposed) into
sensor and locate spring guide on top.
5)
Locate load spring on top of spring guide
and attach
replacement sensor and
housing to enclosure. Ensure that top
of spring encircles plunge guide.
Re-calibrate per PART II.
TOOLS NEEDED
3/8" Open Wrench
TOOLS NEEDED
3
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