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Honeywell Damper Interface Module W8703A1003. The W8703 Damper Interface Module (DIM expands by three zones the capacity of the W8835 EnviraZone control panel. Use with up to three T8635L Microelectronic Communicating Programmable Thermostats and a W8835 EnviraZone Control Panel. • EIM to enable the following features: • Time synchronization. • Shared Filter indication. • Outdoor temperature display in all zones with only one C7089B Outdoor Temperature Sensor connected. • Vacation Hold in all zones. • Check LED in all zones (with W8635B Equipment Interface Module for heat pumps). • System switch setting automatically changes in all zones. • Individual fan control in each zone. SPECIFICATIONS: Description - Damper Interface Module Use with T8635L and W8635A,B Application - Damper Interface Module Network Zoning - Yes Number of Zones - Up to three zones when used with T8635L Communicating Programmable Thermostats and EnviraCom Zone Control Panel Heat Pump Compatible - Yes, use with W8635B Color - Gray Individual Zone Fan Control - Yes Dimensions (in.) 4 3/4 in. high x 4 3/16 in. wide x 1 1/4 in. deep Dimensions (mm) 121 mm high x 107 mm wide x 32 mm deep Mounting No. 6 screw and wall anchors supplied in bag assembly Operating Humidity Range (% RH) 5 to 95% RH, non-condensing LEDs - Yes Electrical Ratings - 20 to 30 Vac Frequency - 50 Hz Frequency - 60 Hz Ambient Temperature Range (F) -40 F to +150 F Ambient Temperature Range (C) -40 C to +66 C Approvals, Federal Communications Commission FCC: Class B