IMT400-09
www.ueonline.com
400 Series
Temperature Controls
Types: B400, B402, B403, C400,
C402,C403, E400, E402, E403,
F400, F402, F403
UNITED ELECTRIC
CONTROLS
Installation and Maintenance
Instructions
Please read all instructional literature carefully and thoroughly before starting. Refer to the final page for the listing of Recommended
Practices, Liabilities and Warranties.
IMT400-09
GENERAL
The 400 Series temperature switch utilizes either a liquid filled sensing stem
(immersion stem, direct mounting) or liquid filled sensing bulb (bulb &
capillary, remote mounting) to detect a temperature change. The response
at a predetermined set point(s) actuates one, two or three snap-acting
switches, converting the temperature signal into an electrical signal. Control
set point(s) may be varied by turning an internal calibrated pointer and
dial (B & E type) or internal adjustment screw (C & F) according to the
procedures outlined (See Part II – Adjustments)
THESE PRODUCTS DO NOT HAVE ANY FIELD REPLACEABLE PARTS.
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.
*Maximum Temperatures - the highest temperature to which a sensing
element may be occasionally operated without adversely affecting set point
calibaration and repeatability.
Please refer to the product bulletins for product specifications. Product
bulletin may be found at www.ueonline.com
PART I - Installation
Tools Needed
Flathead Screwdriver
Hammer (for alternative wire knockouts)
Adjustable wrench
MOUNTING
ALWAYS LOCATE UNITS WHERE SHOCK, VIBRATION AND
TEMPERATURE FLUCTUATIONS ARE MINIMAL. DO NOT MOUNT UNIT
IN AMBIENT TEMPERATURES EXCEEDING PUBLISHED LIMITS.
400 SERIES TEMPERATURE CONTROLS CAN BE MOUNTED IN ANY
POSITION, PROVIDED THE ELECTRICAL CONDUIT IS NOT FACING UP.
THE PREFERRED MOUNTING POSITION IS VERTICAL (TEMPERATURE
CONNECTION FACING DOWN), SPECIFICALLY WHERE HEAVY CONDENSATION IS
EXPECTED.
For remote mounting, mount the unit via the (2) 1/4” screw clearance holes
on the enclosure (see dimensions). Fully immerse the bulb and 6” of capil-
lary in the control zone. It is generally desirable to place the bulb close to the
heating or cooling source in order to sense temperature fluctuations quickly.
Be sure to locate the bulb so that it will not be exposed to temperatures
beyond the instruments range limits.
ALWAYS HOLD A WRENCH ON THE IMMERSION STEM HEX WHEN
MOUNTING UNIT. DO NOT TIGHTEN BY TURNING ENCLOSURE. THIS
WILL DAMAGE SENSOR AND WEAKEN SOLDERED OR WELDED
JOINTS.
On models supplied with an external manual reset button, be sure to leave
sufficient finger space over the reset button for the operator to reset the
control.
WIRING
DISCONNECT ALL SUPPLY CIRCUITS BEFORE WIRING UNIT. WIRE
UNITS ACCORDING TO NATIONAL AND LOCAL ELECTRICAL CODES.
MAXIMUM RECOMMENDED WIRE SIZE IS 14 AWG. THE RECOM-
MENDED TIGHTENING TORQUE FOR FIELD WIRING TERMINALS IS 7 TO 17
IN-LBS.
ELECTRICAL RATINGS STATED IN LITERATURE AND ON NAMEPLATE
SHOULD NEVER BE EXCEEDED. OVER-LOAD ON A SWITCH CAN CAUSE
FAILURE ON THE FIRST CYCLE.
Remove the two screws retaining the cover and cover gasket, a 3/4” NPT E/C
is provided on the right of the enclosure in addition to the two (2) cast-in 7/8”
diameter knockouts for 1/2” electrical conduit that are located on the left side
and rear of the enclosure. These can easily be knocked out by placing the
blade of a screwdriver in the groove and tapping sharply with a hammer.
Connect conduit to the enclosure and wire directly to the switch terminals
according to local and national electrical codes. Bring the wires up to
terminals from the rear of the enclosure. (See Figure 1.) If manual reset
switch or DPDT options are used, lead wires are supplied, color coded as
follows:
Manual Reset Option 1530
(for 400)
Manual Reset Option 1530
(for 402)
Switch 1 Switch 1 Switch 2
C Violet Violet Yellow
NO Blue Blue Orange
NC Black Black Red
IMT400-09
www.ueonline.com
NOTE: The middle switch assembly is omitted for dual switch controllers.
The outer two switch assemblies are omitted for single switch controllers.
Type “C” and “F” controls have internal hex screw adjustments and type “B”
and “E” have cam assemblies for internal calibrated adjustments, via a refer-
ence dial.
PART II - Adjustments
Tools Needed
Screwdriver
NOTE: For set point adjustments and re-calibration, insert bulb or immersion
stem into a calibrated temperature bath. Allow temperature to stabilize for
10 minutes.
Type C400 & F400
Remove cover. Switch has screw adjustments inside enclosure. If switch
transfer point differs from actual temperature, adjust setting. To RAISE the
temperature setting turn the screw left (clockwise) and to LOWER the setting
turn the screw right (counter clockwise). When making adjustments, do not
exceed the maximum temperature rating on nameplate (see Figure 2).
Types C402, C403, F402 & F403
Remove cover. Follow same procedure as paragraph above. Switches may be
set together or apart, up to 100% of range scales. On dual switch models,
either switch may be set high. On triple switch models, the third (middle)
switch has no over-travel mechanism and must always be set to the highest
temperature when switches are set apart. Altering the setting of one switch
will usually have little effect on the other(s), however re-adjustment may be
desired at a critical temperature setting (see Figure 2).
Types B400, B402, B403, E400, E402 & E403
Controls are factory calibrated for maximum accuracy at the dial midpoint.
Switches may be set together or apart up to 100% of the range scale. On
dual switch models either switch may be set high. On triple switch models, the
third (middle) switch has no over-travel mechanism and must always be set to
the highest temperature when the switches are set apart. Altering the setting of
one switch will usually have little effect on the other(s), however re-calibration
may be desired at a critical setting.
To re-calibrate, turn pointer to desired set point. If the actual temperature
and set point temperature do not agree, turn zero adjustment screw
clockwise to raise and counter clockwise to lower set temperature setting
(See Figure 2)
Figure 1
Re-Calibration Adjustment
Figure 2
ALLOW ENOUGH SLACK SO AS NOT TO AFFECT SWITCH MOVEMENT
WHEN MAKING SETTING ADJUSTMENTS AND ENSURE THAT THE
WIRES ARE NOT TOUCHING THE COVER WHEN INSTALLED.
NOTE: For larger wire gauges, a one time shift may be experienced or
expected due to space limitations within the enclosure. Verify set point after
installation.
Types With Manual Reset (Option 1530)
These optional models incorporate a snap switch that, when actuated,
remains tripped until temperature decreases and the reset button (located
on top of the control) is manually depressed to the reset position. On multi-
switch units, this switch must be set to the highest setting.
IMT400-09
www.ueonline.com
Dimensional Drawings
Types B & C, Models 120-121
Types E & F, Models 1BS-8BS
A
SEE TABLE
3/4-NPT THRU NEAR WALL ONLY
Ø7/8 KNOCKOUT ON OPPOSITE &
CENTERED ON REAR OF ENCLOSURE
B
SEE TABLE
5-3/32 [129.4mm]
5-1/2 [139.7mm]
1-17/32
[38.9mm]
1-19/32
[40.5mm]
9/16
[14.3mm]
7-1/8
[181mm]
Ø3/8 [9.5 mm]
A*
3/16
(REF)
Ø5/32 (REF)
* USE DIMENSION “A”
FOR SEPERABLE WELL
INSTALLATIONS.
3/4-NPT THRU NEAR WALL ONLY
Ø7/8 KNOCKOUT ON OPPOSITE &
CENTERED ON REAR OF ENCLOSURE
5-3/32 [129.4mm]
5-1/2 [139.7mm]
1-17/32
[38.9mm]
1-19/32
[40.5mm]
Dimensional drawings for all models may be found at www.ueonline.com.
Model Dimension A Dimension B
120 7-23/32 [196.1 mm] 1-59/64 [48.8 mm]
121 7-37/64 [192.5 mm] 1-25/32 [45.2 mm]
Dimension A
Model Inches mm
1BS 3-3/4 95.3
2BSA 2-5/8 66.7
2BS 2-5/8 66.7
2BSB 2-5/8 66.7
3BS 2-1/8 54.0
4BS 6-3/4 171.5
5BS 5 127.0
6BS 4-1/2 114.3
7BS 3 76.2
8BS 3-1/4 82.6
IMT400-09
www.ueonline.com
CP12112000
UNITED ELECTRIC
CONTROLS
180 Dexter Avenue, P.O. Box 9143
Watertown, MA 02471-9143 USA
Telephone: 617 926-1000 Fax: 617 926-2568
http://www.ueonline.com
RECOMMENDED PRACTICES AND WARNINGS
United Electric Controls Company recommends careful consideration of the fol-
lowing 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 maximum temperature limits stated
in literature and on nameplates must never be exceeded, even by surges in the
system. Operation of the unit up to maximum pressure or temperature is accept-
able on a limited basis (e.g., start-up, testing) but continuous operation must be
restricted to the designated adjustable range. Excessive cycling at maximum pres-
sure or 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 a dangerous runaway condition could result.
• The adjustable range must be selected so that incorrect, inadvertent or mali-
cious setting at any range point cannot result in an unsafe system condition.
• Install unit where shock, vibration and ambient temperature fluctuations will
not damage unit or affect operation. When applicable, orient unit so that mois-
ture does not enter the enclosure via the electrical connection. When appropri-
ate, this entry point should be sealed to prevent moisture entry.
• Unit must not be altered or modified after shipment. Consult UE if modifica-
tion is necessary.
• Monitor operation to observe warning signs of possible damage to unit, such
as drift in set point or faulty display. Check unit immediately.
• Preventative maintenance and periodic testing is necessary for critical applica-
tions where damage could endanger property or personnel.
• 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.
• Do not mount unit in ambient temp. exceeding published limits.
LIMITED WARRANTY
Seller warrants that the product hereby 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 Seller
(Ex-works, Factory, Watertown, Massachusetts. INCOTERMS); provided, however, that
this warranty applies only to equipment found to be so defective within a period
of 24 months from the date of manufacture by the Seller. Seller shall not be obli-
gated under this warranty for alleged defects which examination discloses are due
to tampering, misuse, neglect, improper storage, and in any case where products are
disassembled by anyone other than authorized Seller’s representatives. EXCEPT FOR
THE LIMITED WARRANTY OF REPAIR AND REPLACEMENT STATED ABOVE, SELLER
DISCLAIMS ALL WARRANTIES WHATSOEVER WITH RESPECT TO THE PRODUCT,
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR
ANY PARTICULAR PURPOSE.
LIMITATION OF SELLER’S LIAbILITY
Seller’s liability to Buyer for any loss or claim, including liability 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 inputted to seller, is limited to
the “limited warranty” of repair and/or replacement as so stated in our warranty of
product. 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 the buyer or any
third party.
UE specifications subject to change without notice.
