UE 120 Series User manual

GENERAL
MISUSE OR MISAPPLICATION OF THIS
PRODUCT MAY CAUSE EXPLOSION AND
PERSONAL INJURY. THESE INSTRUCTIONS
MUST BE THOROUGHLY READ AND UNDER-
STOOD BEFORE UNIT IS INSTALLED.
Temperature variations of a liquid filled sensing bulb
are hydraulically transmitted to a bellows or
diaphragm which either actuates or deactuates one
or two snap-acting switches at a predetermined set
point(s). Set points are adjusted by turning an exter-
nal calibrated knob and pointer (B, E types) or inter-
nal adjustment screw (C, F types).
MAXIMUM TEMPERATURE: THE HIGHEST
TEMPERATURE TO WHICH A SENSING ELE-
MENT MAY BE OCCASIONALLY OPERATED
WITHOUT ADVERSELY AFFECTING SET POINT
CALIBRATION AND REPEATABILITY. MAXIMUM
TEMPERATURE STATED IN LITERATURE AND ON
NAMEPLATE MUST NEVER BE EXCEEDED, EVEN
BY SURGES IN THE SYSTEM. OCCASIONAL
OPERATION OF UNIT UP TO MAX.
TEMPERATURE IS ACCEPTABLE (E.G. START-
UP, TESTING). CONTINUOUS OPERATION
SHOULD BE RESTRICTED TO THE DESIGNATED
ADJUSTABLE RANGE.
TOOLS NEEDED
Screwdriver
Adjustable Wrench to 1 1/2”
MOUNTING
INSTALL UNIT WHERE SHOCK, VIBRATION
AND TEMPERATURE FLUCTUATIONS ARE
MINIMAL. ORIENT UNIT SO THAT MOISTURE IS
PREVENTED FROM ENTERING THE ENCLO-
SURE. IT IS IMPERATIVE THAT PROPERLY
RATED EXPLOSION-PROOF SEALING FITTINGS
BE USED FOR ELECTRICAL WIRE ENTRY. DO
NOT MOUNT UNIT IN AMBIENT TEMPERATURES
EXCEEDING PUBLISHED LIMITS.
ALWAYS HOLD A WRENCH ON THE
CONNECTION HEX WHEN INSTALLING
LOCAL MOUNTED UNITS. DO NOT TIGHTEN BY
TURNING ENCLOSURE. THIS WILL DAMAGE
SENSOR AND WEAKEN SOLDER OR WELDED
JOINTS.
120 Series remote mounted temperature controls
should be mounted vertically (temperature assembly
facing down) or horizontally (electrical conduit facing
up) Controls may be surface mounted via the 4-1/4”
screw clearance holes on the enclosure or through
the use of a mounting bracket (See Mounting
Dimensions).
Breather Drain Option M450: Types C120, F120
(Not available on FM approved units)
Mount with breather drain facing down and conduit
connection facing up (See Figure I). The conduit
connection must be properly sealed (potted) for this
type of installation.
Breather Drain Option M450: Types B121,
B122, E121 & E122
(Not available on FM approved units)
Mount in vertical position with temperature assembly
and breather drain facing down (See Figure 2).
Installation and Maintenance
Instructions
IMT120-03
Please read all instructional literature carefully and thoroughly before starting. Refer to the final page for the listing of
Recommended Practices, Liabilities and Warrantees.
120 Series Explosion Proof*
Temperature Controls
Remote Types E121, E122,
E122P, F120; Local Types B121,
B122, C120
FM, UL & CSA listed; Meets Divisions 1 & 2: Class 1,
Groups B, C & D; Class II, Groups E, F & G;
and Class III & Heat Trace Units
NOTE: CSA, Class I, Group B approval does not
apply to controls with option code “1530”.
Part I - Installation
Figure 1: Types C120, F120
Figure 2: Types B121, B122, E121, E122
* Enclosures are designed to withstand gas vapor explosions without bursting or loosen-
ing of joints, and are capable of arresting the propagation of flame from the interior of the
enclosure to the surrounding atmosphere. 1
Breather Drain
(facing down)
Potted
Conduit
Connection
Breather Drain
(facing down)
UNITED ELECTRIC
CONTROLS

TOOLS NEEDED
3/16” Open End Wrench
1/4” Open End Wrench
1/4” Allen Wrench
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.
TOOLS NEEDED
Screwdriver
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 FOR FIELD WIRING
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.
Part II - Adjustments
Figure 3: Use 75° C rated copper conductors only.
Recommended tightening torque for field wiring terminals
is 7-17 in-lbs.
Part III - Replacements
2
Option 1010,
Type F120
Option 1010,
Type E121
Types B122
E122, & E122P
Types B121, C120,
C120, E121,
F120 & F120
HIGH TERMINAL
BLOCK
(ORNG) (YEL) (RED)
NC
NO
NC
NO
COM
COM
(BLK) (VLT) (BLU)
(BLK) (VLT) (BLU)
NO
NC
(ORNG) (YEL) (RED)
(BLK) (VLT) (BLU)
(ORNG) (RED) (YEL)
(BLU)
(BLK)
(VLT)
HIGH SWT.
(REAR)
LOW SWT
(FRONT)
LOW TERMINAL
BLOCK

USE ONLY FACTORY AUTHORIZED
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.
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
TOOLS NEEDED
3/8” Open Wrench
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
TOOLS NEEDED
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.
3

180 Dexter Ave., P.O. Box 9143, Watertown, MA 02272-9143 USA
617 926-1000 Fax [phone]
IKON10M997
Dimension A
Models Inches mm NPT
120,121 8.84 224,0 Immersion stem
1BS-M9B 8.19 208,0 Bulb & capillary
Internal Set Point Adjustment
Types C120, F120
Dimension A
Models Inches mm NPT
120,121 10 254,0 Immersion stem
1BS-M9BB 9.31 237,0 Bulb & capillary
External Set Point Adjustment
Types B121, B122, E121, E122
Models 1BS-M9B Models 120-121
4
1.12
RECOMMENDED PRACTICES AND WARNINGS
United Electric Controls Company recommends careful consideration
of the following factors when specifying and installing UE pressure
and temperature units. Before installing a unit, the Installation and
Maintenance instructions provided with unit must be read and
understood.
• To avoid damaging unit, proof pressure and max temperature
limits stated in literature and on nameplates must never be exceeded,
even by surges in the system. Operation of the unit up to proof pres-
sure or max temperature is acceptable on a limited basis (i.e.start-up,
testing) but continuous operation must be restricted to the designated
adjustable range. Excessive cycling at proof pressure or maximum
temperature limits could reduce sensor life.
• A back-up unit is necessary for applications where damage
to a primary unit could endanger life, limb or property. A high or low
limit switch is necessary for applications where dangerous runaway
condition could result.
• The adjustable range must be selected so that incorrect,
inadvertent or malicious setting at any range point can not result in an
unsafe system condition.
• Install unit where shock, vibration and ambient temperature
fluctuations will not damage unit or affect operation. Orient unit so
that moisture does not enter the enclosure via the electrical
connection.
• Unit must not be altered or modified after shipment. Consult UE if
modification is necessary.
• Monitor operation to observe warning signs of possible damage
to unit, such as drift in set point. Check unit immediately.
• Preventative maintenance and periodic testing is necessary for
critical applications where damage could endanger property or
personnel.
• For all applications, a factory set unit should be tested before use.
• Electrical ratings stated in literature and on nameplate must not
be exceeded. Overload on a switch can cause damage, even on the
first cycle. Wire unit according to local and national electrical codes,
using wire size recommended in installation sheet.
• Use only factory authorized replacement parts and procedures.
• Do not mount unit in ambient temp. exceeding published limits.
• For remote mounted temperature units, capillary lengths beyond
10 feet can increase chance of error, and may require re-calibration of
set point and indication.
LIMITED WARRANTY
UE warrants that the product thereby purchased is, upon delivery, free
from defects in material and workmanship and that any such product
which is found to be defective in such workmanship or material will be
repaired or replaced by UE (F.O.B. UE); provided, however, that this
warranty applies only to equipment found to be so defective within a
period of 12 months after installation by buyer but not to exceed 18
months after delivery by the seller. Except for the limited warranty
of repair and replacement stated above, UE disclaims all war-
ranties whatsoever with respect to the product, including all
implied warranties of merchantability or fitness for any
particular purpose.
LIABILITY LIMITATION
The sole and exclusive remedy of buyer for any liability or seller
for any claim, including incurred in connection with (I) breach of any
warranty whatsoever expressed or implied, (II) a breach of contract,
(III) a negligent act or acts (or negligent failure to act) committed by
seller, or (IV) an act for which strict liability will be imputed to seller,
is limited to the limited warranty or repair and replacement stated
herein. In no event shall the seller be liable for any special,
indirect, consequential or other damages of a like general nature,
including, without limitation, loss of profits or production, or
loss or expenses of any nature incurred by any third party.
UNITED ELECTRIC
CONTROLS