IMP120-17
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Part II - Adjustments
Tools Needed
Screwdriver
5/8” Open End Wrench
5/64” Allen Wrench
AFTER COMPLETING ADJUSTMENTS ON TYPE H121 AND
H122, BE SURE TO RE-INSTALL ADJUSTMENT COVER. DO
NOT OVER TIGHTEN COVER SCREWS.
For set point adjustment and re-gapping (if necessary), connect
device to a calibrated pressure source.
Types J120 (All) and J120K Models 455-559 (See Figure 4A)
Remove cover. Loosen phillips screw adjustment lock. Adjust set point
by turning 5/8” hex adjustment screw clockwise to increase setting,
or counterclockwise to decrease setting. Secure adjustment screw by
tightening adjustment lock.
Type J120K Models 36-39,147-S157B, & 367 (See Figure 4B)
Remove front cover and gasket from sensor
assembly located
below enclosure by unscrewing 4 phillips screws. Loosen phillips
screw adjustment lock. Adjust set point by turning 5/8” hex
adjustment screw clockwise to increase setting or counterclockwise to
decrease setting. Secure adjustment screw by tightening adjustment
lock.
Types H121, H121K
Adjust set point by turning external knob and pointer to desired
setting on scale (see picture, page 1).
Types H122, H122K
Individual microswitches may be set together or separately by up to
100% of range. The front (Low) microswitch should never be set
higher than the rear (High) microswitch. Turning external knobs will
increase or decrease each switch setting independently (see picture,
page 1).
Device with Options
Types with Adjustable Deadband Switch (Select Models & Option
1519)
Models 15622, 15834-15839, 15875 and types with option code 1519
incorporate a snap switch with integral adjustment wheel (see figure 5).
Turning this wheel increases or decreases the pressure rise setting. The fall
setting remains constant. To use the adjustable deadband switch:
1. Determine set point and deadband values. For example, a rising set
point of 20 psi with a deadband value of 6 psi.
2. Set the falling set point at desired deadband value (determined by
subtracting the deadband value from the desired set point) using the
standard adjustment screw as outlined above. Using the example from
step 1, 20 - 6 = 14, so you would set the fall set point at 14 psi. This is
your constant.
3. Set your deadband by turning the adjustment wheel clockwise to increase
or counter clockwise to decrease the setting. Using the example from
step 1, turn the wheel clockwise or counter clockwise until 20 psi is
achieved. This is your set point.
Consult UE for additional information.
Type J120 and H121 with Option 1530, Manual Reset
This microswitch, when actuated, remains actuated until the pres-
sure decreases and the reset button (located on the left side of the
control) is manually depressed to reset the microswitch.
Option 1519 & Select Models
J120K: Opposed Sensor,
Models 36-39, 147-157, S147B,
S157B, 367
Figure 3
Use 90°C copper
conductors only.
Recommended
tightening torque for
field wiring terminals
is 7-17 in-lbs.
Figure 4B
Figure 4A
DO NOT TURN
Deadband adjustment wheel
FIGURE 5
N.C.
N.O.
COM.
Plunger
ORN
YEL
RED
N.C.1
N.C.2
N.O.1
N.O.2
COM. 1
COM. 2
Plunger
RED
YEL.
ORN.
TYPES H121, J120, H121K, J120K, OPTION 1180
TYPES H122, H122K, H122P
OPTION 1010, 1190, 1195 - TYPE J120
BLU
VLT
BLK
NOTE
REVERSE
WIRING OF
LOW SWITCH
N.C.
N.O.
COM.
N.C.
N.O.
COM.
DPDT
SPDT
2SPDT
