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ET 141 High Limit Control
Thermostat
Description
Application
Product Number
Specifications
The ET 141 high limit control thermostat is duct mounted and has a rigid bulb, bi-metal
rod and tube construction.
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.
141-0530
Switch Action
Scale Range
Maximum Bulb Temperature
Cover Finish
Shipping Weight
Thermal System
Dimensions
Agency Certification
Locked Rotor
Amps (LRA)
120 Vac
240 Vac
96
48
Technical Instructions
Document No. 155-021P25
Single-Pole, Single-Throw (SPST)
manual reset
Adjustable from 25°F (-4°C) to
215°F (102°C)
300°F (149°C)
Gray baked enamel galvanized steel
1.8 Ib (0.8 kg)
Rigid bulb, bi-metal rod and tube
construction
See Figure 3
UL Listed: File MP3487, CCN MBPR
CSA Certified: File LR 948,
Class 4813 02
Table 1. Electrical Ratings.
Motor Ratings
(Full Load Amps)
120 Vac
240 Vac
16
8
ET 141-5
September 28, 2004
Non-Inductive Amps
120 Vac
240 Vac
16
16
Siemens Building Technologies, Inc.
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Summary of Contents for Siemens ET 141
- Page 1 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.
- Page 2 Technical Instructions ET 141 High Limit Control Thermostat Document Number 155-021P25 September 28, 2004 Operation and The setpoint adjustment knob (see Figure 2) permits adjustment of the setpoint between Adjustment 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.
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Page 3: Installation
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. -
Page 4: Wiring Diagram
Technical Instructions ET 141 High Limit Control Thermostat Document Number 155-021P25 September 28, 2004 When the temperature increases to above the setpoint, the circuit opens. When the Wiring Diagram reset lever is pressed after the sensed temperature decreases to approximately 20F°... - Page 5 ET 141 High Limit Control Thermostat Technical Instructions Document Number 155-021P25 September 28, 2004 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.