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The W7750A, B, C are LonMark® compliant Constant Volume Air Handling Unit Controllers used to control single zone and heat pump air handlers.


  • High side triac switching (B and C only).
  • Freezestat protection for HVAC equipment (B and C only).
  • Analog outputs (C only).
  • Factory configured via EEPROM with critical user parameter default values.
  • Uses LonTalk® network (E-Bus) communications protocol.
  • High-speed 78 kilobit communications network.
  • Conforms with Echelon® LonMark® HVAC Interoperability standard for Roof Top Unit controllers (profile number 8030).
  • Free Topology Transceiver (FTT) network technology is insensitive to polarity, simplifying installation.
  • Capable of stand-alone operation and has enhanced features available when using the E-Bus network communications.
  • Designed for both staged heating/cooling control and modulating heating/cooling control.
  • Uses either Series 60 Floating Control or PWM (W7750B only) providing modulating control for heating/cooling equipment.
  • Supports two types of economizer control: modulating control and enable/disable control.
  • Provides Proportional Integral Derivative (PID) temperature control.
  • Uses an adaptive algorithm (patent pending) that continuously adjusts the discharge air setpoint as needed (W7750B only).
  • Motion sensor interface for enhanced energy savings.
  • Window sensor input for additional energy savings.

Product Specifications

Packaged RTU; Conventional or Heat Pump Systems
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 (63-7046)
50 Hz; 60 Hz
Approvals, Underwriters Laboratories Inc.
UL 916 (E7741) and cUL (E87741)
Operating Humidity Range (% RH)
5 to 95% RH, non-condensing
Application Size
2 Heat / 2 Cool
I/O Count
6 Digital Outputs (relay), 3 Analog Inputs, 3 Digital Inputs
Output Type
Staged On/Off, Floating, Pulse Width Modulation
Contact Ratings
1.5 A Run @ 24 Vac; 7.5 A inrush @ 24 Vac
Power Consumption
6 VA
24 Vac
Setpoint Temperature Range (C)
7 C to 37 C
Setpoint Temperature Range (F)
45 F to 99 F
Operating Temperature Range (F)
-40 F to +150 F
Operating Temperature Range (C)
-40 C to +66 C
Shipping and Storage Temperature Range (F)
-40 F to +150 F
Shipping and Storage Temperature Range (C)
-40 C to +65 C
Network Communications
LonWorks Bus
Commissioning Software
CARE; LonSpec; RapidZone; LNS Plug-in
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