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Thermostats and Controls for Central Air Conditioners

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Zoning System SZD3 Robertshaw

Zoning System

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In a home, zoning lets people maintain comfortable temperatures in rooms where they spend most of their time, and it minimizes heating and cooling to areas infrequently used. Consumers enjoy optimal room temperatures, and zoning pays for itself through reduced energy costs and the installation of multiple systems. In commercial applications such as an office, a conference room can be kept at a cooler temperature than the rest of the facility. A restaurant dining area could be kept at a different temperature from the kitchen or any offices. Everyone benefits from zoning, and it’s suitable for a wide range of applications.

  • Low profile, ultra slim logic panel
  • Standard unit controls 3 zones
  • Expandable up to 7 zones in 2-zone increments
  • Compatible with electric, gas, oil or heat pump equipment
  • Controls 3-stage heat and 2-stage cool for heat pumps
  • Controls 2-stage heat and 2-stage cool for heating and cooling equipment
  • Add-on heat pump equipment eliminates need for a fossil fuel kit
  • LED indicator displays all system functions
  • Clock input terminals set universal system scheduling
  • Selectable upstage delay to auxiliary heat of 5, 10, 15 or 20 minutes
  • Independent fan control available for each zone
  • Selectable continuous fan and plenum fan switch
  • On-board emergency/normal/off selector switch
  • 45-second fan purge into last zone(s) for added comfort
  • Smoke input terminals allow connection to duct smoke detectors
  • Contains high/low limit and balance point inputs
  • Unit has selectable control algorithms and time or zone upstaging
  • Minimum ON/OFF time override feature
  • Selectable G2 fan provides control by zones or stages
  • G2 has selectable economizer power terminal



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