Brochure
Table Of Contents
- Table of Contents/TIs
- Pneumatic Room Thermostats-Powerstar
- Pneumatic Room Thermostats- D Series
- Pneumatic Thermostats for Specialized Applications
- Pneumatic Relative Humidity Sensors
- Electric Room Thermostats/Controllers
- Low Voltage Wall Thermostats
- Line Voltage Remote Bulb Thermostats
- Line Voltage Room Thermostats-Heating/Cooling
- RAA... Room Thermostats
- RAB... Fan Coil Thermostats
- RCC... Room Temperature Controllers for 2-pipe Fan Coil Units
- RCC... Free Energy Band Room Temperature Controllers for 4-pipe Fan Coil Units
- RCU50... Room Temperature Controllers for CAV and VAV Systems
- RCU61 Room Temperature Controllers for CAV and VAV Systems
- RDU... Room Temperature Controllers with LCD for Heating/Cooling Systems
- RDX... Room Temperature Controllers with LCD
- Electric Thermostats for Specialized Applications
- Accessories and Service Kits
features
A-25
www.sbt.siemens.com/hvp/components
Description
Applications
Thermostats & Hygrostats
Unit Mounted Thermostats
188
188 Unit Mounted Thermostat.
The 188 Unit Mounted Thermostats are designed primar-
ily for use in fan coil induction units and unit ventilators to
control the temperature within and occupied space. The
thermostats temperature range is limited to applications at
ambient temperatures.
The 188 Unit Mounted Thermostat is a gradual acting
thermostat with a remote bulb operating on the force-bal-
ance principle, using pneumatic feedback to obtain linearity
and maintain selected room temperature by positioning
pneumatic devices to control heating or cooling.
• Liquid-filled thermal system temperature
sensing element
• Durable die-cast metal case with rugged
set point knob
• Adjustable sensitivity
• Universal mounting bracket for easy instal-
lation
• Integral adjustable limit stops
• Available as:
- Direct Acting only (Heating)
- Reverse Acting only (Cooling)
- Heat or Cool depending on supply
air pressure
Typical Connections