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W7753A is a direct digital controller for unit ventilators with staged, floating, or pulse width modulation output using pre programmed heating, cooling, economizer, and ASHRAE cycles I, II, or III algorithms.


  • Uses standard EchelonĀ® LonMark Unit Ventilator functional profile for openness and interoperability with Lon Mark devices.
  • Applications include unit ventilators with up to two stages heat/cool; floating heat/cool/economizer, pulse width modulating (PWM) heat/cool/economizer; ASHRAE Cycles I, II, III.
  • Two unused digital outputs can be used as free points controlled by the network for lighting, exhaust fan.
  • Can be used for indoor air quality control using an external sensor/control and economizer minimum position reset.
  • Provides optional energy-saving setpoints for heating/cooling in unoccupied/occupied and standby modes.
  • Optional control sequence shutdown via window/door open digital input.
  • On-board network jacks for quick commissioning and troubleshooting using the E-Vision configuration tool.
  • On-board status LED.
  • Free topology transceiver (FTT) for flexible installation.
  • UL94-5V flame-retardant construction.

Product Specifications

Unit Ventilator
Dimensions (in.)
5 5/8 in. high x 6 in. wide x 2 1/8 in. deep
Dimensions (mm)
143 mm high x 152 mm wide x 54 mm deep
Used With
See Application Selection Guide (63-7044)
One T7770 wall module input
50 Hz; 60 Hz
Approvals, Underwriters Laboratories Inc.
UL 916
Application Size
2 Heat / 2 Cool
I/O Count
8 Digital Outputs (triac), 2 Analog Inputs (resistive), 2 Analog Inputs (voltage), 4 Digital Inputs
Output Type
Staged On/Off, Floating, Pulse Width Modulation
Power Consumption
6 VA
Setpoint Temperature Range (C)
13 C to 29 C
Setpoint Temperature Range (F)
55 F to 85 F
Shipping and Storage Temperature Range (F)
-40 F to +150 F
Shipping and Storage Temperature Range (C)
-40 C to +65 C
Approvals, Federal Communications Commission
FCC part 15 Class B requirements
Network Communications
LonWorks Bus
Commissioning Software
CARE; LonSpec; RapidZone; LNS Plug-in
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