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Excel 10 W7751B,D,F VAV II Controllers

FEATURES

• Uses Echelon LonWorks^� network (E-Bus) protocol.
• Free Topology Transceiver (FTT) high speed 78 kilobit communications network.
• Compliant with VAV Device Object Type number 8010 functional LonMark^� profile.
• Capable of stand-alone operation, but can also use E-Bus network communications.
• 120 controllers per Q7750A Excel 10 Zone Manager.
• Easy user access to the E-Bus network communications jack.
• Designed for Pressure Independent or Pressure Dependent Single or Dual Duct Variable Air Volume (VAV) and Constant Volume Air Terminal Unit control.
• Uses a Microbridge air flow sensor with patented dual integral restrictor design.
• Easy user access to air flow sensor inputs.
• Provides Proportional Integral Derivative (PID) temperature control.
• Energy saving setpoint reset for electrical demand limit control.
• Floating or modulating hot water or three-stage electric heat.
• Series or induction fan control.
• Provides patented nonlinear floating algorithm for velocity control loops.
• Individual zone pressurization for supply and exhaust control.
• Factory configured via EEPROM with critical user parameter default values.
• Supports motion sensor interface for enhanced energy savings.
• Supports Terminal Regulated Air Volume (TRAV) concept.
• Supports pressurize and depressurize, night purge, and morning warm-up sequences.
• Both plastic housing and controller module wiring subbase are UL 94-5V rated (W7751D,F).

GENERAL

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.

DESCRIPTION

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.

SPECIFICATIONS

Models

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 provided by plugging the connector into the communications jack. Digital outputs, earth 24 Vac power connections are made with (6.35 mm) quick connects.

W7751D: The W7751D uses a two-piece construction controller module and an internally wired Field wiring 14 to 22 AWG (2.0 to 0.34 mm conduit, connects to the terminal blocks on subbase. The controller module plugs into subbase.

W7751F: The W7751F uses a two-piece construction controller module and an externally wired Field wiring 14 to 22 AWG (2.0 to 0.34 mm connected to the terminal blocks on the top external edges of the subbase. The controller plugs into the prewired subbase. See Table Control techniques supported.

 

Single Duct Applications: See Table 2.

 

Table 2. Single Duct Application (Pressure Independent

 

* If both Reheat and peripheral heat are used in the same application:

Both must be same output type such that both are staged, floating or staged PWM (all PWM actuators must use the same time-based mode parameters).

The first and second stage ordering is selectable between; stage 1 - reheat, stage 2 peripheral or stage 1 - peripheral, stage 2 reheat

** All single duct applications support series fan,

(Induction fan): parallel temperature and fan flow or PWM fan for operations or no fan.

NOTE: PWM fan actuator temperature controls just the opposite of a VAV damper actuator such that an increase in air flow gives a decrease in fan speed.

*** Parallel fan options: Standard - controlled by temperature and acts as a form of reheat. Flow - adds return air from the plenum to ensure minimum discharge flow.

Dual Duct Applications

See Table 3.

Input/Output:

See Tables 4 and 5. 

Table 3. Dual Duct Applications

 

Table 4. VAV II Controller Inputs