Brochure

features
A-13
www.sbt.siemens.com/hvp/components
Description
Applications
Thermostats & Hygrostats
193 HC
Powerstar (Hesitation) Free
Energy Band Heating/Cooling
Pneumatic Room Thermostats
Typical wall plate and screws.
193 HC Thermostat
chassis.
193 HC Thermostat with plastic cover. Chassis
wall plate with easy maintenance plug-in adapters
shown (optional).
• Dual set point dials available in Fahrenheit
or Celsius scales
• Sensitive bimetal responds to temperature
changes
• Integral, field adjustable limit stops
• Adjustable Free Energy Band
• Wall mounting plate for connection to a
variety of rough-in terminal boxes included
• Test port for fast check of output pressure
without removing the cover
• Field replaceable thermometer, set point
dials, restrictors, and filters
Options
• Fixed limit stops to
meet government
specifications
• Quick-connect air
connections for ease of
installation and service
• Large, 1/2” set point
knob for convalescent
homes
The 193 HC Powerstar (Hesitation) Free Energy Band
Heating/Cooling Pneumatic Room Thermostat is an excel-
lent choice for saving energy by sequencing heating and
cooling valves. In most heat/cool pneumatic applications, a
3 to 8 psig (21 to 55 kPa) heating valve and a 10
to 14 psig (69 to 103 kPa) cooling valve is used. By design,
this provides a 2 psi (14 kPa) deadband where no heating
or cooling is occurring. The hesitation feature allows you to
change the deadband range to a 3, 4 or 5 psi (21, 28, or
34 kPa) range to save energy. Refer to the Input/Output
chart below for more information.
Providing proportional, single output, dual set point,
2-pipe pneumatic room temperature control, the 193 HC
Powerstar (Hesitation) Free Energy Band Heating/Cooling
Pneumatic Room Thermostat is designed to sequence a
heating device or a cooling device.
The hesitation feature keeps the output pressure constant
through a 6°F (10.8°C) range (typical), causing a dead-
band.
Application Drawing
Input/Output Characteristics