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Technical Instructions

Document No. 155-016P25

ET 134-22

Rev. 1, February, 2000

Low Temperature Detection
Thermostat

Siemens Building Technologies, Inc.

Description

The electric Low Temperature Detection Cut-out and Alarm Thermostat is a remote bulb
instrument which opens an electrical circuit to stop the supply fan motor and/or closes an
outside air damper when the temperature at the sensing element falls below the setting
of the instrument. Simultaneously, it closes a circuit to indicate an alarm condition.

Features

Manual reset

Easy temperature setting with adjusting screw on top of enclosure

Mounting bracket and two screws included

Main and separate reverse-acting auxiliary contacts

Product Number

134-1504

Warning/Caution Notations

WARNING

Personal injury/loss of life may occur if a procedure is
not performed as specified.

CAUTION

Equipment damage, or loss of data may occur if the
user does not follow a procedure as specified.

Application

This instrument should only be used on those applications where the ambient
temperature to which the instrument case and bellows are exposed remains above
the temperature setting of the thermostat. This thermostat should be used in areas
protected from the weather.

Summary of Contents for Powers ET 134 Series

Page 1: ... condition Features Manual reset Easy temperature setting with adjusting screw on top of enclosure Mounting bracket and two screws included Main and separate reverse acting auxiliary contacts Product Number 134 1504 Warning Caution Notations WARNING Personal injury loss of life may occur if a procedure is not performed as specified CAUTION Equipment damage or loss of data may occur if the user doe...

Page 2: ...nch OD x 20 feet 6 m Reset action Manual Electrical rating See Table 1 Weight 2 4 lbs 1 1 kg Dimensions See Figures 2 and 5 Approvals UL file SA 3863 CSA file LR948 Operation This thermostat incorporates a temperature sensing element of the vapor filled type which actuates a heavy duty contact through a rugged link mechanism Any one foot length of the element subjected to temperatures below the te...

Page 3: ... element bellows points down Install as much of the bulb as possible in a horizontal plane If too much of the bulb is vertical it will not operate properly Avoid sharp bends or kinks in the sensing element Large walk in Ducts Figure 1 1 Attach the mounting bracket to the thermostat with the two round head screws provided 2 Mount the two perforated steel strap hangers inside the duct with the wide ...

Page 4: ...e opposite side of the duct near the bottom from where the thermostat will be mounted 3 Mount a second flange on a 8 inch by 4 inch sheet metal plate Cut an access opening for the bulb on the duct diagonally across from the duct mounted flange Drill mounting screw holes for the sheet metal plate 4 Cut a length of copper tubing to fit diagonally across the duct Stretch out the bulb and wrap it arou...

Page 5: ...age to the equipment 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 An opening for 1 2 inch conduit is provided in the bottom of the thermostat enclosure See Figure 3 for a typical wiring diagram Figure 3 Typical Wir...

Page 6: ...Deerfield Parkway Buffalo Grove IL 60089 4513 U S A Document No 155 016P25 Printed in the U S A Page 6 Adjustment After mounting the thermostat adjust the temperature setting using the set point adjusting screw on the top of the enclosure See Figure 4 Observe a complete operating cycle to be sure that all components function correctly Figure 4 Set Point Adjustment Screw Calibration There is no fie...

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