Siemens Powers ET 134 Series Betriebsanleitung

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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.

Technical Instructions Low Temperature Detection Cut-out and Alarm Thermostat

Document Number 155-016P25

Rev.1, February, 2000

Page 2 Siemens Building Technologies, Inc.

WARNING:

This low temperature detection thermostat is 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

installer’s responsibility to add devices (safety, limit controls) or

systems (alarm, supervisory systems) that protect against, or

warn of control failure.

Specifications Switch Action Main (LINE-M2) contacts open on

temperature drop, simultaneously auxiliary

contacts close

Range 15 to 55°F (-9 to 13°C)

Maximum bulb temperature 400°F (204°C)

Minimum differential 5°F (2.8°C) Non-adjustable

Sensing element Vapor filled

Bulb length 1/8-inch 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 temperature

setting of the thermostat will actuate the thermostat switch mechanism regardless of

the temperature being sensedby the remainder of the element. This makes the

thermostats ideal for protecting large coils where air stratification could cause

freezing conditions in a localized area.

The thermostat has a main and auxiliary contact unit. The main load circuit

(LINE-M2) opens on temperature drop and simultaneously, an auxiliary or alarm

circuit (LINE-Ml) closes on temperature drop.

NOTE: The reset button must be manually pressed down and released to resume

normal fan system operation.

Low Temperature Detection Cut-out and Alarm Thermostat Technical Instructions

Document Number 155-016P25

Rev. 1, February, 2000

Siemens Building Technologies, Inc. Page 3

Electrical Ratings

Table 1.

Pole

Number Line-M2 (Main) Line-M1 (Auxiliary)

Motor

Rating 120 V 208 V 240 V 277 V 120 V 208 V 240 V 277 V

AC Full Load

Amps 16.0 9.2 8.0 6.0 3.3 3.0 

AC Locked

Rotor Amps 96.0 55.2 48.0 36.0 19.8 18.0 

AC Non-Ind

Amps 16.0 9.2 8.0 7.2 6.0 6.0 6.0 6.0

Pilot Duty-Both Poles 125 VA, 24 to 600 Vac

57.5 VA, 120 to 300 Vdc

Mounting and

Installation

General Guidelines •Locate the sensing element in the downstream side of the coil.

•Locate the case and bellows where the ambient temperature is always warmer than

the set point.

•Install the thermostat so that the reset button is readily accessible and the 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 part of the

hanger strap parallel to the air flow.

3. Drill a hole in the side of the duct. With the bulb still coiled, thread the bulb through

the hole using a rotary movement.

4. Mount the thermostat on the outside of the duct.

5. Carefully uncoil the bulb avoiding sharp bends or kinks in the sensing element.

6. Mount the bulb in a horizontal, serpentine manner, attaching the bulb to the strap as

shown in detail in

Figure 1

The installation is complete.

NOTE: For an alternate method of mounting, use coil clips (Part Number 356-115) in

the fins to hold the bulb in a horizontal, serpentine pattern.

Technical Instructions Low Temperature Detection Cut-out and Alarm Thermostat

Document Number 155-016P25

Rev.1, February, 2000

Page 4 Siemens Building Technologies, Inc.

Mounting and

Installation, Continued

Figure 1. Typical Mounting in Walk-in Duct.

Limited Access Ducts

(

Figure 2

)1. Attach the mounting bracket to the thermostat with the two round head screws

provided.

2. Attach a mounting flange (part number 808-412) on the 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 around the tubing. See

Figure 2.

5. Insert the tubing and bulb through the access hole and into the duct-mounted

flange. Fasten the 8-inch by 4-inch sheet metal plate to the duct.

6. Mount the thermostat on the outside of duct.

Low Temperature Detection Cut-out and Alarm Thermostat Technical Instructions

Document Number 155-016P25

Rev. 1, February, 2000

Siemens Building Technologies, Inc. Page 5

Figure 2. Bulb Mounting for Limited Access Ducts with 808-412 Mounting Flange.

Wiring WARNING:

Disconnect the power supply before wiring connections are made to

avoid possible electrical shock or damage 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 Wiring Diagram.

CAUTION:

Use terminal screws furnished (#8-32 x 1/4-inch binder head screw).

Longer terminal screws can interfere with switch mechanism and

damage the switch.

Technical Instructions Low Temperature Detection Cut-out and Alarm Thermostat

Document Number 155-016P25

Rev.1, February, 2000

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

Siemens Building Technologies, Inc.

Landis &Staefa Division

1000 Deerfield Parkway

Buffalo Grove, IL 60089-4513

U.S.A.

Document No. 155-016P25

PrintedintheU.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 operatingcycle to be sure that all components function correctly.

Figure 4. Set Point Adjustment Screw.

Calibration There is no field calibration required for the thermostat.

Troubleshooting Observe a complete operatingcycle to be sure that all components function correctly.

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

Dimensions

Figure 5. Dimensions in Inches (Millimeters).

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