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WIRING
DISCONNECT ALL SUPPLY CIRCUITS
BEFORE WIRING UNIT. WIRE UNITS
ACCORDING TO NATIONAL AND LOCAL ELECTRI-
CAL CODES. MAXIMUM RECOMMENDED WIRE
SIZE IS 14 AWG. THE RECOMMENDED TIGHTEN-
ING
TORQUE
TERMINALS IS 7 TO 17 IN-LBS.
ELECTRICAL RATINGS STATED IN LITERA-
TURE AND ON NAMEPLATES MUST NOT BE
EXCEEDED—OVERLOAD ON A SWITCH CAN
CAUSE FAILURE ON THE FIRST CYCLE.
TO PREVENT SEIZURE OF ENCLOSURE
COVER, DO NOT REMOVE LUBRICANT
(PETROLATUM). THREADS SHOULD ALSO BE
FREE OF DIRT, ETC.
NOTE: Replacing cover hand tight (5 full threads
engaged) is sufficient to maintain proper protection.
Additional tightening may be required to fully engage
cover "O" ring and seal enclosure for rain-tight protec-
tion.
Types B121, C120,
C120, E121,
F120 & F120
(BLK) (VLT) (BLU)
NC
NO
Option 1010,
Type E121
(ORNG) (YEL) (RED)
(BLK) (VLT) (BLU)
Use 75° C rated copper conductors only.
Figure 3:
Recommended tightening torque for field wiring terminals
is 7-17 in-lbs.
2
FOR
FIELD
WIRING
Types B122
E122, & E122P
HIGH TERMINAL
BLOCK
(ORNG) (YEL) (RED)
NC
COM
HIGH SWT.
NO
(REAR)
NC
COM
LOW SWT
NO
(FRONT)
(BLK) (VLT) (BLU)
LOW TERMINAL
BLOCK
Option 1010,
Type F120
(ORNG) (RED)
(YEL)
(BLK)
(VLT)
(BLU)
Part II - Adjustments
AFTER COMPLETING ADJUSTMENTS ON
TYPE 121 AND 122 CONTROLS, BE SURE
TO RE-INSTALL ADJUSTMENT COVER. DO NOT
OVER TIGHTEN COVER SCREWS.
NOTE: For set point adjustments and recalibration,
connect control to a calibrated temperature source
and stabilize unit.
Types C120, F120
Adjust set point by holding plunger with 1/4" open end
wrench and turning hex adjusting screw clockwise (in)
to increase or counter-clockwise (out) to decrease
setting. Turn adjustment screw until switch transfers.
Turning "in" for switch transfer achieves temperature
"fall" setting. Turning "out" for switch transfer
achieves temperature "rise" setting.
Type B121 and E121
Adjust set point by turning external knob and pointer
to desired setting on scale. Recalibration: To adjust
set point after replacing switch(es) and/or thermal
assembly: Slowly turn adjustment knob until switch
transfers. Compare switch transfer point to actual
temperature. If they do not agree, loosen set screw on
adjustment knob and align pointer to indicate actual
temperature. Turning knob from low to high tempera-
ture for switch transfer achieves temperature "fall" set-
ting. Turning knob from high to low temperature for
switch transfer achieves temperature "rise" setting.
Type B122 and E122
Individual switches may be set together or apart up to
100% of range. When not set together, the front
switch can not be set higher than the rear switch.
Turning external knobs will increase or decrease each
switch setting independently. Recalibration: Follow
procedure above for Type B121 and E121 for each
switch.
Types E122P
Individual switches may be set together or apart by up
to 60% of range. The front switch is set by turning the
internal calibrating screw to the right for lower set
point and turning to the left for higher set point. When
not set together, the front switch can not be set higher
than the rear switch. Turning the external knob
will increase or decrease each switch setting
simultaneously without disturbing their relationship.
Part III - Replacements
TOOLS NEEDED
3/16" Open End Wrench
1/4" Open End Wrench
1/4" Allen Wrench
TOOLS NEEDED
Screwdriver
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