Part II - Adjustments
Tools Needed
Models 126, 134, S126B, S134B:
3/16" & 1/4" open-end wrenches
Models 136-160, S136B-S164B, 680:
5/8" open-end wrench
Models 258-274, 354-364:
11/16" open-end wrench
Models 218-230:
1/4" open-end wrench
Models 610-614:
3/16" open-end wrench
Pressure Models
For set point adjustment, connect unit to a calibrated pressure source.
Remove cover and gasket. The adjusting screw, labeled “A” in Figures 1 &
2, is located beneath the switch and is turned to adjust the set point. Using
the appropriately sized open-end wrench (see Tools Needed above), turn the
adjustment screw towards the left (clockwise) to increase set point or towards
the right (counter-clockwise) to decrease set point.
Vacuum Models
For set point adjustment, connect unit to a calibrated source. Remove cover
and gasketing. The adjusting screw, labeled “A” in Figures 1 & 2, is located
beneath the switch and is turned to adjust the set point. Using a 1/4” open-end
wrench, turn the adjustment screw towards the right (counter-clockwise) to
increase set point (towards full vacuum) or towards the left (clockwise) to
decrease set point (towards 0 psig)
.
NOTE: For models 126-134 & S126B-S134B, use 3/16” open-end wrench to
keep item B (Figure 2) from turning.
Figure 1:
Models 136-160, S136B-S164B, 258-274,
and 354-364
Figure 2: Models 126, 134, S126B, S134B, 218-230,
610-614, 680
NOTE: Picture shows optional adjustable deadband switch (option 1520)
Types with Adjustable Deadband Switch (Option 1520)
Types with option code 1520 incorporate a snap switch with integral adjust-
ment wheel (Item C in Fig. 2). Turning this wheel raises or lowers the pres-
sure rise set point. The fall set point remains constant. To use the adjust-
able deadband switch:
• Determine set point and deadband values. For example, a rising set
point of 20 psi with a deadband value of 6 psi.
• 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
set 1, 20 – 6 = 14, so you would set the fall set point at 14 psi. This
is your constant.
• Set your deadband by turning the adjustment wheel left to raise or
right to lower the set point. Using the example from step 1, turn the
wheel left or right until 20 psi is achieved. This is your set point.
Consult UE for additional information.
Types with Manual Reset Switch (Option 1530)
These optional models incorporate a snap switch that when actuated, remains
actuated until the pressure decreases and the reset button (located on top of
the enclosure) is manually depressed to reset the switch.
REPLACE COVER AND GASKET WHEN ALL OPERATIONS ARE
COMPLETE AND BEFORE USING.
“A”
ADJUSTMENT:
R.H. THREAD - TURN RIGHT
(COUNTER-CLOCKWISE) FOR HIGHER
PRESSURE SETTING
2 MT'G. HOLES.
(107.2mm)
(47.6mm)
CLEAR FOR 1/4 SCREW
8
7
1
C
16
(7.9mm)
5
4
NC
7
32
3 9
16
(90.5mm)
1/4 N.P.T.
PRESSURE CONNECTION
3/4 HEX
ADJUSTMENT: HOLD PLUNGER
ACROSS FLATS WITH WRENCH
TURN ADJ. SC. OUT FOR DEEPER
VACUUM SETTING.
WHEEL SPRING
COVER REMOVED IN FRONT VIEW
OPTIONAL SWITCH ADJUSTMENT:
R.H. THREAD - TURN RIGHT
(COUNTER-CLOCKWISE) FOR CLOSER
SWITCH DIFFERENTIAL
IM6-08
