Honeywell W7751B, W7751D, W7751F Product specification sheet
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The W7751B,D,F are Variable Air Volume (VAV) Controllers in the Excel 10 family product line. These VAV systems provide pressure independent or pressure dependent air flow control and series or induction fan control using single and dual duct applications. VAV systems generally provide cool air only to the zones. The W7751 controllers provide additional outputs that control VAV box reheat coils. The heaters can be staged electric or modulating hot water. Supply and exhaust pressurization control are provided on a zone basis.
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U.S. Registered Trademark
Copyright 1997 Honeywell Inc. • All Rights Reserved
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The W7751B,D,F are Variable Air Volume (VAV) Controllers in the Excel 10 family product line. These VAV systems provide pressure independent or pressure dependent air flow control and series or induction fan control using single and dual duct applications. VAV systems generally provide cool air only to the zones. The W7751 controllers provide additional outputs that control VAV box reheat coils. The heaters can be staged electric or modulating hot water. Supply and exhaust pressurization control are provided on a zone basis.
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provided by plugging the connector into the communications jack. Digital outputs, earth ground and 24 Vac power connections are made with quarter inch (6.35 mm) quick connects.
W7751D: The W7751D uses a two-piece construction controller module and an internally wired subbase. Field wiring 14 to 22 AWG (2.0 to 0.34 mm2), through a conduit, connects to the terminal blocks on the subbase. The controller module plugs into the prewired subbase.
W7751F: The W7751F uses a two-piece construction controller module and an externally wired subbase. Field wiring 14 to 22 AWG (2.0 to 0.34 mm2) is connected to the terminal blocks on the top and bottom external edges of the subbase. The controller module plugs into the prewired subbase. See Table 1 for Control techniques supported.
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W7751B: The W7751B is implemented on a snap track compatible Printed Wiring Board (PWB). Terminal blocks are used to make connections to the digital input terminals (13 through 17) the wall module terminals (19 through 25) and the communications terminals 29 and 30. Connection for access to E-Bus is
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See Table 2.
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Up to three stages of electric or hot water heat |
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no fan |
Floating hot water heat |
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induction fan (Parallel Temperature or Fan Flow) |
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Pulse Width Modulated (PWM) heat |
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(PWM Fan) |
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Floating damper output |
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series fan (Series Fan) |
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Three setpoint sets for heating and cooling.
Occupied—Normal hours or if bypass invoked from wall module during unoccupied hours.
Standby—Energy saving period during occupied hours, invoked by motion detector.
Unoccupied—Off hours.
Supply, exhaust pressurization control are provided on a zone basis.
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* If both Reheat and peripheral heat are used in the |
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same application: |
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Damper Control Only |
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Both must be same output type such that both are |
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staged, floating or staged PWM (all PWM |
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Damper Control, 1, 2, or 3 Stages Reheat |
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actuators must use the same time-based mode |
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Damper Control, 1 Stage Peripheral Heat |
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parameters). |
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The first and second stage ordering is selectable |
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Damper Control, Floating or PWM Reheat |
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between; stage 1 - reheat, stage 2 peripheral or |
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Damper Control, Floating or PWM Peripheral Reheat |
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stage 1 - peripheral, stage 2 reheat |
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** All single duct applications support series fan, |
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Damper Control, Floating or PWM Reheat Plus Floating or |
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(Induction fan): parallel temperature and fan flow or |
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PWM Peripheral Heat* |
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PWM fan for operations or no fan. |
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Return Flow Tracking |
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NOTE: |
PWM fan actuator temperature controls just the |
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Staged Heat Options: |
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opposite of a VAV damper actuator such that an |
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Reheat |
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increase in air flow gives a decrease in fan speed. |
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Standard, stepped (1, 1 and 2, 1 and 2 and 3) |
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Binary (1, 2, 1 and 2) |
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*** Parallel fan options: |
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Peripheral Heat |
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Standard - controlled by temperature and acts as a |
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1 stage only |
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form of reheat. |
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Fan Options**: |
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Flow - adds return air from the plenum to ensure |
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Series |
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minimum discharge flow. |
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(Induction fan): |
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Parallel*** |
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Temperature |
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See Table 3. |
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Flow |
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PWM fan |
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None |
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See Tables 4 and 5. |
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Modulating Heat Options (Reheat and Peripheral) |
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Floating |
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Pulse Width Modulation (PWM) |
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Dual Duct, Pressure Independent, with flow mixing, with cold and hot duct flow pickups (uses a satellite Excel 10 for the hot duct)
Dual Duct, Pressure Independent, without flow mixing, with cold and hot duct flow pickups (uses a satellite Excel 10 for the hot duct)
Dual Duct, Pressure Independent, constant volume, with cold and hot duct flow pickups (uses a satellite Excel 10 for the hot duct)
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Dual Duct, Pressure Independent, with cold duct pickup only
Dual Duct, Pressure Independent, constant volume, with discharge pickup only, Flow sensor in discharge air. The temperature control loop controls the cool damper position and the flow controls adjust the heating damper position
Dual Duct, Pressure Independent, discharge pickup, no mixing
Dual Duct, Pressure Dependent, with flow mixing
Dual Duct, Pressure Dependent, without flow mixing
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