The W7750 series is the Constant Volume Air Handling Unit (CVAHU) controller in the Excel 10 family. It is a LonMark compliant device designed to control single zone and heat pump air handlers. The W7750 series can be configured to control a wide variety of possible equipment arrangements (see Common Configuration Options Summary for CVAHU). The various model for The XL10 CVAHU is available as follows.
To configure a CVAHU application.
Learn how to navigate to the CVAHU pages.
| Criteria | W7750A | W7750B | W7750C | W7750B Enhanced |
| Digital Outputs | 6 (Relay) | 8 | 5 | 8 |
| Analog Outputs | 0 | 0 | 3 | 0 |
| Conventional or Heat pump control | yes | yes | yes | yes |
| Stages of electric or gas fired heating | 1-4 | 1-4 | 1-4 | 1-4 |
| Stages of Cooling | 1-4 | 1-4 | 1-4 | 1-4 |
| Heating | N/A | Floating, or Pulse width modulated | Floating, Pulse width modulated, reverse Pulse width modulated, Analog, or reverse Analog | Floating, Pulse width modulated, reverse Pulse width modulated |
| Cooling | N/A | Floating, or Pulse width modulated | Floating, Pulse width modulated, Reverse Pulse width modulated, Analog, reverse Analog | Floating, Pulse width modulated, Reverse Pulse width modulated |
| Mixed Air Damper Output | Floating | Floating or Pulse width modulated | Floating, Pulse width modulated, Reverse Pulse Width modulated, Analog, reverse Analog | Floating, Pulse width modulated, Reverse Pulse Width modulated |
| Optional outputs | AuxEcon, OccStatus, Free1, Free2, Free1PulseOn or Free1PulseOff | AuxEcon, OccStatus, Free1, Free2, Free1PulseOn or Free1PulseOff | AuxEcon, OccStatus, Free1or reverse Free1, Free2 or Reverse Free2,
Free1PulseOn or Free1PulseOff Free1AO or Free1AORev Free2AO or Free2AORev |
AuxEcon, OccStatus, Free1or reverse Free1, Free2 or Reverse Free2,
Free1PulseOn or Free1PulseOff |
| Override | Occupancy sensor override and window open override | Occupancy sensor override and window open override | Occupancy sensor override and window open override | Occupancy sensor override and window open override |
| Analog Inputs | 3 resistive | 4 resistive and 2 voltage | 4 resistive and 2 voltage With Outdoor 20KNTC sensor support |
4 resistive and 2 voltage With Outdoor 20KNTC sensor support |
| Digital Inputs | 3 digital inputs | 5 digital inputs | 5 digital inputs with Coil Freeze Status support | 5 digital inputs with Coil Freeze Status support |
| LED digital output | Yes | Yes | Yes | Yes |
| Power Supply | N/A | 22 VDC power supply | 22 VDC power supply | 22 VDC power supply |
Note: One digital input is reserved for the Wall Module Bypass.
One analog input reserved for Wall Module Sensor and one analog input reserved for Wall Module Setpoint.
Consult the System Engineering Guide before configuring the CVAHU. Also, refer to Excel 10 W7750A,B,Enhanced B, C Constant Volume AHU Controller Specification Data, form 74-2956; or Excel 10 W7750A, B,Enhanced B, C Constant Volume AHU Controller Installation Instructions, form 95-7521-1 for more information.