Honeywell excel 10 w7751h User Manual

95-7553-04

The W7751H Smart VAV Actuator is a factory-combined 

Excel 10 Variable Air Volume (VAV) Box Controller and an 

ML6174 Direct-Coupled Actuator with De-clutch mechanism. 

The actuator/controller assembly is field mounted to the VAV 

box damper shaft similar to the mounting of a standard 

actuator, and the controller wiring is terminated to the screw 

terminals that are located under a snap-on cover. See Fig. 1. 

The Smart VAV Actuator is a Free Topology Transceiver (FTT) 

L

ON

M

ARK

® compliant controller. The W7751H2025 is for 

smoke control use.

The ML6174 Direct-Coupled Actuator with De-clutch 

mechanism (see Fig. 2 for location) allows the installer to 

manually open or close the VAV box damper connected to the 

W7751H without power or software tool to command it.

The controller in the W7751H contains a Microbridge flow-

through pressure sensor and communicates via the 

78 kilobaud Echelon

® L

ON

W

ORKS

® Bus Network.

Triac output loads must draw a minimum current of 25 mA at 

24 Vac, 60 Hz nominal. Triac maximum current rating: 77 mA.

The actuator on the W7751H mounts directly onto the VAV 

box damper shaft and has up to 70 lb-in. torque (8 Nm), 90 

degree stroke, and 90 second timing at 60 Hz.

The actuator on the W7751H can accommodate the optional 

field-installed auxiliary switches.

NOTE: Mounting thermostat/sensor greater than 20 ft from 

the W7751H2025 requires 14506944-001 Transient 

Protectors. They must be installed on the thermostat/

sensor leads from the T7770C pins 3, 4, 5, 6, and 7.

Horizontally mount the W7751H on the damper shaft and 

allow clearance for wiring, servicing and module removal. 

Avoid mounting the W7751H in areas where acid fumes or 

other deteriorating vapors can attack the metal parts of the 

actuator, or in areas where escaping gas or other explosive 

vapors are present. See Fig. 2 for mounting dimensions.

M19924

CCW

CCW

CW

CW

60 

45 

45 

60