IMT400-09
www.ueonline.com
400 Series
Temperature Controls
Types: B400, B402, B403, C400,
C402,C403, E400, E402, E403,
F400, F402, F403
U N I T E D E L E C T R I C
C O N T R O L S
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
