Siemens Powers ET 134 Owner's manual

Technical Instructions
PowersTM Controls
ET 134 Line Voltage Room
Thermostats
Document No. 155-017P25
ET 134-55
August 27, 2021
134-1083 134-1084 &134-1085
Exposed Knobs
134-1084 & 134-1085
Concealed Adjustment
134-1086
Description The ET 134 series are line voltage, wall mounted thermostats that are available with
exposed or concealed set point adjustment. Models are available with Single-Pole,
Single-Throw (SPST) or Single-Pole, Double-Throw (SPDT) contact action and for
standard-duty (nominal 1/4 hp; 10 amps, non-inductive) or heavy-duty (nominal 1 hp;
22 amps, non-inductive) applications.
Features
134-1083
•Locking cover with Allen screws.
•Concealed auto-off-fan selector switch.
•Adjustable high range stop.
134-1084, 134-1085,
134-1086
•Dual Fahrenheit and Celsius scale thermometers.
•Separable mounting plate for mounting and wiring without removing cover.
•Locking cover with Allen screws.
•Concealed, adjustable low and high range stops.
•Large, exposed set point knob (134-1084 and 134-1085)
•Internal, dual Celsius and Fahrenheit scale.
•Optional blank faceplate included (134-1084 and 134-1085).
Warning/Caution Notations
Siemens Industry, Inc.
Part No. 996-286 Rev. E
WARNING Personal injury/loss of life may occur if a procedure
is not performed as specified.
CAUTION Equipment damage may occur if the user does not
follow a procedure as specified.

Technical Instructions
Document Number 155-017P25
August 27, 2021
ET 134 Line Voltage Room Thermostats
Page 2
Siemens Industry, Inc.
Application These line voltage thermostats control heating, cooling or year-round air conditioning units
in commercial, industrial or residential installations. Typical uses are for unit heaters, fan
coils, blast coils, refrigerated storage rooms, electric heat, duct furnaces, greenhouses,
etc.
WARNING:
Product Number
Specifications
These thermostats are designed for use only as an operating
control. Where an operating control failure would result in
personal Injury and/or loss of property, it is the responsibility of
the installer to add devices (safety, limit controls) or systems
(alarm, supervisory systems) that protect against, or warn of,
control failure.
Table 1. 134-1083 Electrical Ratings.
Description cULus
Volts AC 50/60 Hz 120 208 240
Full load amperes 6 3.4 3
Lock rotor amperes 36 20.4 18
Pilot duty 125 VA, 24 Vac to 277 Vac
Table 2. 134-1084 and 134-1086 Electrical Ratings.
Description cULus
Volts AC 50/60 Hz 120 208 240 277
Full load amperes 12 6.9 5 
Lock rotor amperes 72 41.4 30 
Resistive amperes 10 10 10 10
Pilot duty 125 VA, 24 Vac to 277 Vac
Table 3. 134-1085 Electrical Ratings.
Description cULus
Volts AC 50/60 Hz 120 208 240 277
Full load amperes 16 9.2 8 
Lock rotor amperes 96 55.2 48 
Resistive amperes 22 22 22 22
Pilot duty 125 VA, 24 Vac to 277 Vac

Siemens Industry, Inc.
Page 3
ET 134 Line Voltage Room Thermostats
Technical Instructions
Document Number 155-017P25
August 27, 2021
Table 4. Product Numbers and Specifications.
Product
Number
Set Point
Adjustment
Dual Set Point
Range
°
F (
°
C)
Differential °F(°C)
Switch
Action
Weight Ibs. (kg)
134-1083
Concealed
40 to 90
(5 to 32)
1.8
(1)
SPST with
"AUTO-OFF
FAN" Switch
1.3
(0.6)
134-1084
*Exposed
Knob, or
Concealed
1.8 (1) Htg.
2.3 (1.3) Clg.
SPDT
Heating/Cooling
1.0
(0.45)
134-1085 3 (1.7) Htg.
3.5 (2) Clg.
134-1086 Concealed 1.8
(1)
SPST
open on
Temperature rise
Heating only
1.0
(0.45)
Approval UL File E35198
*Each thermostat is shipped with a blank faceplate for use when concealed adjustment is desired.
Table 5. Conformity Declaration.
Information 134-1083 134-1084, 134-1085, 134-1086
Purpose of control Line voltage thermostats
Construction of control Electromechanical independently mounted control
Number of cycles
100K cycles (auto reset switch)
6K cycles (manual operated rotary
switch)
100K cycles (auto reset switch)
Method of mounting control Two cross key holes slots in base of case for mounting to a vertical outlet box 2 ×
4 in. (51 × 102 mm)
Method of grounding of control
Wiring binding screw terminal
Type 1 or Type 2 action
Type 1.C (micro-interruption)
External pollution
Pollution degree 3
Internal pollution
Pollution degree 2
Rated impulse voltage
4,000 Vac
Ball pressure temperature
Auto reset switch component: 302°F (150°C)
Field wiring rating
Use copper conductors only
Switch
SPST: 134-1083, with 3 position rotary
switch
SPST: 134-1086
SPDT: 134-1084, 134-1085
Enclosure
UL: TYPE 1 (NEMA)
Wiring connection
Screw type terminals, terminal
identification molded in the block
Screw type terminals, terminal
identification labelled on the barrier
Ambient conditions
32°F to 105°F (0°C to 40°C)
Compliance
North America
cULus listed; UL 60730, E60730, File E35198

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Siemens Industry, Inc.
Technical Instructions
Document Number 155-017P25
August 27, 2021
ET 134 Line Voltage Room Thermostats
Mounting The proper location of a heavy-duty room thermostat is very important to ensure good
performance.
•Make sure the thermostat is in a place where air circulates around it freely.
•Never install the thermostat on or near an outside wall.
•Keep the thermostat away from windows and doors.
•Do not locate the thermostat too close to a strong light or any other false source of
heat such as direct sunlight, steam lines, etc.
•Mount the thermostat on a post or partitioning wall, but make sure that there are no
pipes or duct work in that wall or in the other side of the wall.
•Mount in a vertical position.
Wiring
WARNING:
Disconnect the power supply before wiring connections are made to
avoid possible electrical shock or equipment damage.
Make all wiring connections using copper conductors only and in accordance with the
National Electrical Code and local regulations. Loads exceeding the rating of the
thermostat should be handled by means of a relay or motor starter.
•Install an electrical conduit box for the thermostat.
•Pull the required wires to this box.
CAUTION:
Use terminal screws furnished (No. 8-32 × 1/4-inch binder head
screw). Substitution of other screws can cause problems in making
proper connections.
Service There is no servicing of the thermostat. Replace if inoperative.

Siemens Industry, Inc.
Page 5
ET 134 Line Voltage Room Thermostats
Technical Instructions
Document Number 155-017P25
August 27, 2021
Installation of
134-1083
Read the Mounting and Wiring sections.
1. Make the wiring connections to the numbered terminals on the back of the
thermostat. Figure 1 shows typical wiring diagrams.
Typical Auto-Off-Fan application for
134-1083 thermostat.
Typical heating application for
134-1084, 134-1085, 134-1086
thermostats.
Typical cooling application for
134-1084, and 134–1085
thermostats.
Figure 1. Wiring Diagrams.
2. Remove the thermostat cover by loosening the Allen screws at the top and bottom of
the thermostat. The Allen wrench is included with the thermostat.
3. Mount the thermostat to the box using the two keyhole openings in the thermostat
base.
4. Set the high temperature cut-out stop.
a. Turn the thermostat dial so the desired high temperature setting minus one
degree is at the pointer. See Figure 2.
b. Loosen the stop screw and slide the screw toward the back of the dial against the
step behind the dial.
c. Tighten the stop screw.
5. Set the desired temperature. Turn the dial to the pointer located at the nine o’clock
position. See Figure 2.
6. Turn the selector switch so that desired AUTO, OFF, or FAN reads vertically. See
Figure 2.
7. Replace the thermostat cover. Tighten the screws on the bottom and top of the
thermostat.
The installation is now complete.

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Siemens Industry, Inc.
Technical Instructions
Document Number 155-017P25
August 27, 2021
ET 134 Line Voltage Room Thermostats
Figure 2. Interior View of the 134-1083.
Figure 3. Mounting a 134-1084, 134-1085 or 134-1086 Thermostat to a Conduit Box.

Siemens Industry, Inc.
Page 7
ET 134 Line Voltage Room Thermostats
Technical Instructions
Document Number 155-017P25
August 27, 2021
Installation of
134-1084, 134-1085,
134-1086
Read the Mounting and Wiring sections.
1. Do not remove the thermostat cover to install.
2. Remove the mounting plate from the back of the thermostat by unscrewing the
mounting plate locking screw (see Figure 3) with the Allen wrench provided.
3. Fasten the plate to the conduit box with the screws provided on the mounting plate.
4. Make the wiring connections to the terminals on the back of the thermostat. Terminal
number 1 identification is stamped on the terminal block. See Figure 1 for typical
wiring diagrams.
5. Hook the two slots in the back of the thermostat over the prongs of the mounting
plate. Swing the thermostat into position on the plate.
6. Tighten the mounting plate locking screw.
The installation is now complete.
Adjustments
To remove the thermostat
cover
1. Pull off the knob.
2. Loosen the thermostat cover screw with the Allen wrench provided.
To convert to concealed
adjustment
1. Remove the thermostat cover by loosening the Allen screws at the top and bottom of
the thermostat. The Allen wrench is included with the thermostat.
2. Peel off the backing from the enclosed faceplate.
3. Position the new faceplate over the factory-installed faceplate.
4. Press firmly onto the cover.
5. Set the thermostat dial by lining up the desired set point at the nine o'clock position.
6. Replace the cover and tighten the thermostat cover screw.
To set high and low range
stops
See Figure 4
1. Before the cover is removed, set the dial to the maximum stop setting.
2. Pull off the knob.
3. Hold the dial firmly, press tab "A", and rotate the tab clockwise until it stops against
stop “C”.
4. Release the tab and be sure it snaps into the desired notch.
5. Set the dial at the lowest temperature stop setting desired.
6. Hold the dial firmly, press tab "B" and rotate it counter clockwise until it stops against
stop “C”.
7. Release the tab and be sure it snaps into the desired notch.
8. Replace the cover, tighten the cover screw, and push on the knob.
9. Rotate the knob to the desired setting.
Figure 4. Interior of 134-1084, 134-1085 and 134-1086 Thermostats with High
and Low Adjustment Stops.

Technical Instructions
Document Number 155-017P25
August 27, 2021
ET 134 Line Voltage Room Thermostats
.
Dimensions
Dimensions in Inches
(Millimeters)
Figure 5. Dimensions of the 134-1083 Thermostat.
Figure 6. Dimensions of the 134-117
Thermostat Guard.
Figure 7. Dimensions of 134-1084, 134-1085 and 134-1086 Thermostats.
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. Powers is a registered trademark of Siemens Industry, Inc. Other product or company names mentioned
herein may be the trademarks of their respective owners. © 2021 Siemens Industry, Inc.
Siemens Industry, Inc.
Smart Infrastructure
1000 Deerfield Parkway
Buffalo Grove, IL 60089
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Document No. 155-017P25
Printed in the USA
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