Data Sheet for Product

Powers
TM
Controls
Technical Instructions
Document No. 155-072P25
TH 832-1
March 27, 2009
D Room Thermostat Direct Acting
Siemens Industry, Inc.
Description
Powers D Room Thermostat is a gradual-acting, pneumatic instrument recommended
for room temperature control in heating and air conditioning applications. Among the
outstanding features of the D thermostat are its rapid response to temperature change
and its unique design which prevents a constant waste of air. Other features include a
wide range of adjustment, noncorrosive parts, ease of calibration and quiet operation.
These factors ensure long, dependable life and maintenance-free operation.
The thermostat cover and base are designed to blend with all color schemes and
furnishings. The standard instrument has a calibrated thermometer and either exposed
or concealed adjustment. Factory replacement parts and instructions for servicing are
available, should they be required.
Application
While the D Room Thermostat is primarily designed for control of individual rooms
heated or cooled by radiation, ventilation or an air conditioning system, it is very
versatile. Other applications include room control of radiant panels, finned radiation and
unit ventilators.
Product Numbers
Table 1.
Product
Numbers
Description
832-0120 Concealed adjustment with thermometer
832-0490 Concealed adjustment without thermometer
832-0500 Exposed key adjustment with thermometer
832-1260 Exposed knob adjustment with thermometer
Typical
Specifications
All thermostats are equipped with a vapor pressure operated sensing element, shall be
capable of responding to a change of plus or minus 1/2°F (0.3°C), and shall be gradual
acting capable of positioning valves or dampers in intermediate positions. The
thermostats shall be of the non-bleed type so that no air shall be used except when
positioning a valve or damper motor. The thermostats shall be provided with an
adjustable range of 60°F to 85°F (15°C to 30°C).