Product Overview

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Thermostats
A-13
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).
Applications
The 193 HC Powerstar (Hesitation) Free Energy Band
Heating/Cooling Pneumatic Room Thermostat is an
excellent 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.
Description
Providing proportional, single output, dual setpoint,
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 deadband.
Features
• Dual setpoint dials available in Fahrenheit or
Celsius scales
• Sensitive bimetal responds to temperature changes
• Integral, fi eld 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, setpoint dials,
restrictors, and fi lters
Options
• Fixed limit stops to
meet government
specifi cations
• Quick-connect air
connections for ease of
installation and service
• Large, 1/2" setpoint
knob for convalescent
homes
Application Drawing
Input/Output Characteristics