Siemens ET 141 Betriebsanleitung

Technical Instructions

Document No. 155-021P25

ET 141-5

September 28, 2004

ET 141 High Limit Control

Thermostat

Description The ET 141 high limit control thermostat is duct mounted and has a rigid bulb, bi-metal

rod and tube construction.

Application Normally, the thermostat is used as a high limit control when a "lock-out" type control is

desired or required by local code. Often it is located in a return air duct and is wired to

shut down air conditioning or ventilating fans when the duct air temperature becomes

excessive.

Product Number 141-0530

Specifications Switch Action Single-Pole, Single-Throw (SPST)

manual reset

Scale Range Adjustable from 25°F (-4°C) to

215°F (102°C)

Maximum Bulb Temperature 300°F (149°C)

Cover Finish Gray baked enamel galvanized steel

Shipping Weight 1.8 Ib (0.8 kg)

Thermal System Rigid bulb, bi-metal rod and tube

construction

Dimensions See Figure 3

Agency Certification UL Listed: File MP3487, CCN MBPR

CSA Certified: File LR 948,

Class 4813 02

Table 1. Electrical Ratings.

Locked Rotor

Amps (LRA)

Motor Ratings

(Full Load Amps)

Non-Inductive Amps

120 Vac 240 Vac 120 Vac 240 Vac 120 Vac 240 Vac

96 48 16 8 16 16

Siemens Building Technologies, Inc.

Technical Instructions ET 141 High Limit Control Thermostat

Document Number 155-021P25

September 28, 2004

Operation and

Adjustment The setpoint adjustment knob (see Figure 2) permits adjustment of the setpoint between

25°F and 215°F (-4°C and 101°C).

The temperature differential is factory set, non-adjustable, and approximately 20°F

(11°C), depending on the rate of temperature change.

The standard model includes a knob for setpoint adjustment.

Temperature Setpoint

Stop The temperature setpoint stop is an integral part of these controls, and is field

adjustable. To set the stop, do the following:

1. Set dial temperature at desired stop.

2. Remove control cover.

3. Loosen the stop screw, slide the screw to the front of the control against the plastic

stop behind the dial, and tighten the screw (see Figure 2). Sometimes, an exact stop

setting is not possible, and the stop must be set to the closest stop corresponding to

the required dial setting.

ET0110R1

Cutout Stop Bracket

With Slot and Screw

Setpoint

Adjustment

Screw

Figure 1. Setpoint Stop Screw.

Reset Procedure Verify that the temperature has dropped to 20°F (11°C) below setpoint. Press the reset

lever to reset the unit (closing the circuit).

ET0108R1

Reset Lever

Setpoint Window

Setpoint Knob

Figure 2.

Page 2 Siemens Building Technologies, Inc.

ET 141 High Limit Control Thermostat Technical Instructions

Document Number 155-021P25

September 28, 2004

Installation 1. Select a mounting location for the thermostat in the duct (or plenum). The location

must allow the sensing element to measure the average temperature in the duct.

2. Drill (or cut) a 1-3/8 inch hole in the duct at the selected mounting location (see

Figure 3).

3. Using the flange as a template on the duct, mark the location for two #10 × 1/2" long

sheet metal screws.

4. Punch (or drill) both sheet metal screw holes in the duct at the marked locations.

5. Secure the flange to the duct with the two #10 × 1/2" long sheet metal screws

provided.

6. Insert the sensing element and sleeve through the flange installed in Step 5 (and

into the duct).

7. Secure the thermostat to the flange by screwing the set screw firmly against the

sleeve. Do not over-tighten the set screw.

NOTE: Insert the sensing element as far as possible into the air stream without

allowing it to contact any object inside the duct. Provide at least 5-3/4 inch

(14 cm) clearance between the sensor and any other objects inside the

duct.

ET0105R1

141-0530

Duct

Set Screw

Flange

Sensing Element

Sleeve

Sheet Metal Screw

Sheet Metal Screw Hole

1-3/8 in. Hole

Figure 3. Installation.

Siemens Building Technologies, Inc. Page 3

Technical Instructions ET 141 High Limit Control Thermostat

Document Number 155-021P25

September 28, 2004

Wiring Diagram When the temperature increases to above the setpoint, the circuit opens. When the

reset lever is pressed after the sensed temperature decreases to approximately 20F°

(11C°) below the setpoint, the circuit closes.

See Figures 4 and 5 for terminal identification and typical wiring connections.

NOTE: Only use the terminal screws furnished with the thermostat (#8-32 ×

1/4-inch binder head). Use of other screws will void warranty, may damage

switch terminals, and result in improper connections

ET0106R1

Common

Figure 4. Terminal Identification.

ET0107R1

141-0530

Power Supply Other

Operating or

Limiting Control

Fan Motor

or Motor

Starter Coil

Figure 5. Typical Wiring Diagram.

Checkout

Procedure

After installing the thermostat, perform the following procedures. Observe at least three

complete operating cycles to verify that all components are functioning properly. If the

unit fails to checkout, replace it.

Return Air Applications 1. After completing the installation and wiring procedures, turn on the power to the

circuit.

2. Turn the setpoint knob counterclockwise until the thermostat shuts down the system.

The thermostat should lock-out.

NOTE: The setpoint at shutdown should equal the approximate duct air

temperature.

3. Turn the setpoint knob clockwise to the desired setpoint. Nothing should happen.

4. Press the reset lever. The system should restart.

Page 4 Siemens Building Technologies, Inc.

ET 141 High Limit Control Thermostat Technical Instructions

Document Number 155-021P25

September 28, 2004

Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as

design improvements are introduced. Other product or company names mentioned herein may be the trademarks of their respective owners.

Siemens Building Technologies, Inc.

1000 Deerfield Parkway

Your feedback is important to us. If you have

comments about this document, please send

Supply Air Applications 1. After completing the installation and wiring procedures, turn on the power to the

circuit.

2. Raise the supply air temperature to the setpoint temperature.

NOTE: The supply air temperature can be raised by simulating a fan failure or

restricting the return air flow.

3. When the system shuts down, determine the temperature at the thermostat sensing

element. The temperature reading should closely approximate the thermostat's

setpoint at which the system is shut down.

4. Return the system to normal operation by re-establishing the air flow or by restarting

the fan.

5. Press the reset lever. The system should restart.

Service There is no servicing of this thermostat. Replace if inoperative.

Dimensions

ET0109R1

0.25ÿ

(6)

0.75ÿ

(19)

Diameter

9.33

(237)

(102)

0.5

(13)

0.34

(9)

4.41

(112)

0.35

(9)

1.81

1.30

1.25

(32)

3.66

(93)

2.16

(55)

0.88

(22) Diameter

0.61

(15)

Figure 6. Dimensions in Inches (Millimeters in Parentheses).

Buffalo Grove, IL 60089-4513

U.S.A.

them to [email protected] Page 5

Document No. 155-021P25

Country of Origin: US

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