IMT120-12
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TOOLS NEEDED
3/16” open end wrench (2)
1/4” open end wrench
5/64” allen wrench
5/16” open end wrench (2 required for 822e only)
after coMpleting adjustMents on all 120 series, be sure to
re-install adjustMent cover. do not over tighten cover screws.
for set point adjustment and recalibration, connect device to a calibrated
temperature source and stabilize.
Types C120, F120
remove cover.
adjust set point by holding plunger with 3/16” open end
wrench and turning the calibrating screw with another 3/16” open end
wrench (see figure 3). turn clockwise to increase setting or counter-
clockwise to decrease setting.
ORN
YEL
RED
TYPES B122, E122, E122P
BLU
VLT
BLK
NOTE
REVERSE
WIRING OF
LOW SWITCH
N.C.
N.O.
COM.
N.C.
N.O.
COM.
2SPDT
N.C.
N.O.
COM.
Plunger
TYPES B121, C120, E121, F120, 820E
SPDT
N.C.1
N.C.2
N.O.1
N.O.2
COM. 1
COM. 2
Plunger
RED
YEL.
ORN.
OPTION 1010, 1190, 1195
(FOR TYPE B121, C120, E121, F120 ONLY)
DPDT
N.C.
N.O.
COM.
N.C.
N.O.
COM.
TYPE 822E
#1
#2
NC NO COM NC NO COM
SWT#2
SWT#1
BLK BLU VLT RED ORN YEL
Figure 3
Figure 2
use 90°c copper conductors only.
recommended tightening torque for
field wiring terminals is 7-17 in-lbs.
Part II - Adjustments
Types B121 and E121
remove adjustment cover. adjust set point by turning external knob and
pointer to desired setting on scale (see figure 4).
Types B122 and E122
individual switches may be set together or separately by up to 100% of
range. the front (low) switch should never be set higher than the rear (high)
microswitch. turning external knobs will increase or decrease each switch
setting independently (see figure 4).
Indicating Temperature Switch Types 820E & 822E
NOTE:
prior to making any device adjustment, the cover and adjustment
knob should be removed. when adjustment is completed, all applicable parts
should be replaced.
Type 820E
Move the set point adjustment pointer up scale beyond the brown indicating
pointer. this permits checking the set point by moving the lever arm upward
with a finger or tool simulating thermal assembly movement. connect test
lights to indicate switch operation or listen for the switch to click. loosen
adjustment “a” and move the adjustment pointer until it agrees with the
indicating pointer (see figure 5). when the switch clicks re-tighten the screw.
Type 822E
NOTE:
type 822e has a single knob and pointer for both switches. both
switches are standardly, factory set together within 5% of the dial range.
turning the knob positions both switches simultaneously, maintaining a
constant separation between them.
remove the explosion-proof die-cast cover to permit access to the switches.
Move the adjustment pointer up scale beyond the indicating pointer by an
amount greater than the difference between the switch settings by moving
the actuating lever upward with a finger or a tool simulating thermal assembly
movement (see figure 5). connect test lights to indicate switch operation or
listen for the individual switch clicks.
the set point of switch #1 is determined by the red adjustment pointer. the
set point of switch #2 may be adjusted by up to 25% of the range span
below the switch #1 set point by turning adjustment “d” in (clockwise).
see back page for 822e dual switch adjustment. the set point of switch #2
should not be above that of switch #1.
to align switch #1 to the adjustment pointer, loosen adjustment “a” and
set the adjustment pointer to the scale, then re-tighten adjustment “a” (see
figure 5).
NOTE:
indicating pointer deflection (820e, 822e): the indicating pointers
will read slightly low when the bulb temperature is 15° above the controller
setting. this deflection is normal and repeatable (approximately 0.5% of
scale range on single switch models) and is due to the transference of the
switching mechanism load to the thermal system. it can be measured by
moving the setting pointer from the high to the low end of the scale and
observing the resultant indicating pointer deflection.
Figure 4
external knob and pointer
adjustment
ORN
YEL
RED
TYPES B122, E122, E122P
BLU
VLT
BLK
NOTE
REVERSE
WIRING OF
LOW SWITCH
N.C.
N.O.
COM.
N.C.
N.O.
COM.
2SPDT
N.C.
N.O.
COM.
Plunger
TYPES B121, C120, E121, F120, 820E
SPDT
N.C.1
N.C.2
N.O.1
N.O.2
COM. 1
COM. 2
Plunger
RED
YEL.
ORN.
OPTION 1010, 1190, 1195
(FOR TYPE B121, C120, E121, F120 ONLY)
DPDT
N.C.
N.O.
COM.
N.C.
N.O.
COM.
TYPE 822E
#1
#2
NC NO COM NC NO COM
SWT#2
SWT#1
BLK BLU VLT RED ORN YEL
ALSO FOR OPTION 1180
