Product Overview

TH 134 Pneumatic High and Low Temperature Detection Thermostats Technical Instructions
Document Number 155-063P25
April 1, 2005
Siemens Industry, Inc. Page 3
Specifications
(Also See Table 2)
Material
Case 0.062-inch (1.6 mm) cold rolled steel
Cover 0.028-inch (0.7 mm) cold rolled steel
Pneumatic Switch Normally closed, 0.022-inch (0.6 mm)
dia. bleed restrictor
Ambient temperature range
134-1700 Greater than set point to 140°F (60°C)
134-1710 -40° to 140°F (-40° to 60°C)
Restrictor 40 scim (11 ml/sec)
Shipping Weight 2.4 lbs. (1.1 kg)
Dimensions See Figure 9
Table 2. Specifications.
Product
Number
Type of Control Range °F (°C) Differential
°F (°C)
Bulb & Capillary Max. Bulb Temp.
°F (°C)
134-1700 Low Temperature
Lockout
15 to 55 (-9 to 12.8) 5* (2.8) 1/8 in. OD x 20 ft. bulb 400
with stop at 35 (1.67) Non-Adj. (204)
134-1710 High Temperature
Lockout
100 to 170 10** (5.6) 6 ft. cap. 250
(38 to 77) Non-Adj. 3/8 in. OD x 10 in. bulb (121)
*Temperature must increase 5°F (2.8°C) before pneumatic switch can be closed again.
**Temperature must decrease 10°F (5.6°C) before pneumatic switch can be closed again.
Operation
The pneumatic switch holds a dead ended line to approximately 25 psig (172 kPa) air
pressure with zero bleed when in normally closed position.
These thermostats open a pneumatic switch when the sensed temperature reaches the
set point.
NOTE: The reset button must be pressed manually and released to resume normal fan
system operation.
Model 134-1700
The low temperature thermostat responds to the lowest temperature along the entire
20-foot sensing bulb or bellows cup. It opens the pneumatic switch when the temperature
at any 1-foot length along the bulb reaches the control set point.
Model 134-1710
The high temperature thermostat responds to the remote bulb sensing air temperature in
a duct. It opens a pneumatic switch when the sensed temperature reaches the control
set point.
Figure 5. High/Low Temperature Detection Thermostat with Manual Reset.