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Deadband WPT

Deadband Wireless Pneumatic Thermostat (WPT-DB)

WPT-DB Functionality

  • The WPT-DB enables two set points to be programmed instead of one set point
  • For example, heating could be programmed for 68° and cooling could be programmed for 78°
    • The thermostat would not call for heating or cooling when the ambient temperature is between these two setpoints
    • The thermostat would call for cooling when the ambient temperature rises above 78°
    • The thermostat would call for heating when the ambient temperature falls below 68°

WPT-DB Benefits

  • The WPT-DB can save up to 60% of HVAC energy, depending on factors such as local setpoint policies, climate, building type, etc.
  • The WPT-DB enables automatic enforcement of deadband setpoint policies, which cannot be enforced with existing pneumatic thermostats
  • Deadband energy benefits are incremental to the energy savings achieved with the standard WPT

WPT-DB Applications

  • The WPT-DB can be used in any facility that currently has pneumatic thermostats
  • Typically, deadband setpoint policies are in place in large institutions, such as universities, where some temperature variation is acceptable

Deadband Features

  • Adjustable deadband minimum and maximum setpoints
  • Adjustable neutral pressure
  • Available in direct or reverse acting versions
  • Available in single- or two-pipe configurations
  • Directly compatible with existing deadband stats from major vendors
  • Remote wireless deadband control and monitoring of temperature and pressure
  • Pager/cell notification of excursions
  • Automatic self-calibration
  • Programmable temperature setbacks
  • Occupancy override
  • Enables Auto-Demand Response strategies
  • BACnet interface for integration with Building Management Systems
  • Compatible With existing Johnson, Honeywell, Siemens, Robertshaw and TAC pneumatic stats.
  • 2+ years of battery life

WSTM Payback Calculator2 (years)

WSTM Installed Cost3:
$1000 per unit

Your Steam Cost:
per 1,000 lbs.

Inspection Frequency4:

Inspection Costs5:
per trap

Facility Uptime:

Failure Rate6:
per year

1. Orifice diameter should not be confused with pipe diameter. Consult the steam trap manufacturer if orifice size is not known.
2. Calculations are theoretical estimates and actual results will vary. Payback calculation includes avoided lost steam and inspection labor. Benefits from avoided damage resulting from blocked traps are not included in model. The formula used for steam loss in this model is: L=24.24*Pa*D2. Where L=pounds/hour, Pa=Pgauge + Patm , D=orifice diameter.
3. Actual WSTM installed cost will vary based on volume and integrator.
4. Refers to the manual inspections of steam traps that are currently being done at the facility. The frequency determines the potential avoided failure time when using the WSTM.
5. The frequency and cost of inspection determine the labor savings enabled by the WSTM.
6. The failure rate per year should be based on historical data from the facility. 15-20% failure rates per year are typical. In unmaintained facilities, the failure rate can be much higher: