Fort Lauderdale, FL – Popular Honeywell online retailer DtiCorp.com (http://www.DtiCorp.com)
is introducing 8 Honeywell W7751 Unitary Controllers for Excel 5000.
The W7751B,D and F are VAV II Controllers in the Excel 10 family product
line. These VAV controllers provide pressure independent or pressure
dependent air flow control and series and parallel (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. W7751H and J Smart
VAV Actuator are factory-integrated VAV Box Controllers with a 90 second
ML6174B Direct-Coupled Actuator in the Excel 10 family product line.
Features:
- Uses Echelon LonWorks protocol.
- W7751B,D,F use Free Topology Transceiver (FTT) networks and are
compliant with VAV device object type number 8010 functional LonMark
profile.
- Energy saving setpoint reset for electrical demand limit control.
- Actuator included with W7751H mounts directly onto VAV box damper
shaft and has up to 35 lb. in. torque, 90 degrees stroke, and 90 sec.
- Timing at 60 Hz.
- High speed 78 kilobit communications network.
- Capable of standalone operation, but uses E-Bus network communications.
- Easy user-access to the network communications jack.
- Uses enhanced microbridge-type airflow sensor with dual integral restrictor design.
- Easy user-access to airflow sensor inputs.
- Provides Proportional Integral Derivative (PID) temperature control.
- Designed for pressure independent Variable Air Volume (VAV) control.
- Floating hot water and three-stage electric or modulating hot water heat.
- Provides nonlinear floating algorithm for velocity control loops.
- Individual zone pressurization for supply and exhaust control.
- Factory configured via EEPROM with critical user parameters default values.
- Motion sensor interface for enhanced energy savings.
- Supports Terminal Regulated Air Volume (TRAV) concept.
- Pressurize and depressurize, night purge, and morning warm-up sequences supported.
- Wall module options for sensor, setpoint and bypass.
- Software selectable limits on remote setpoint adjustments.
- Three integrated 8 bit pipelined microprocessors running at 10 MHz.
- 14 bit A/D converter.
- 32K by 8 ROM/PROM, 512 bytes of EEPROM, and 2048 bytes of static RAM.
- W7751D,F mount to a standard 4 x 4 in. and 5 x 5 in. junction box or snapped to 35 by 7.5mm EN50022 DIN Rail.
- Subbase provides the slotted hole pattern for the R7450 series IRC devices (118×87 mm)
Specifications:
- When the VAV II controller is being balanced, the configuration or balancing tool may indicate stable
airflow and allow balancing before the controller has actually reached
the balancing control setpoint. During this period, if any measurements
are made of the actual airflow volume and entered while the controller
is still ramping to the airflow setpoint, erroneous balancing results
may be recorded.
- All VAV II controllers must be balanced for both minimum and maximum
airflow for highest accuracy. If the controller’s final configuration is
to be a constant volume unit, a minimum airflow balance is
recommended.
- Excel 10 VAV II Controllers must have an air flow pickup table
downloaded to ensure accurate balancing. Configuration tools do not
automatically install the flow pickup table defined for the controller.
- If VAV II Controllers are not balancing, check with the Honeywell
Authorized technician or Honeywell contractor that the flow pickup table
download to each controller has occurred.
- Anytime the controller’s airflow measurement process is to be tested or troubleshooting is attempted, the
airflow must be constant. The VAV II controller should be fixed at some
desired or stable setpoint that is not changed during troubleshooting or
testing.
- Anytime the airflow pickup tubes are disconnected from the controller, the controller should be powered
down. There is no chance of damage to the controller, but if the
controller is exposed to unusually high static pressure (< 5.0 in.
w.c.) when one pickup tube is connected there is a very slight
possibility that the
controllers sensing process will stop operating. Should this condition
be suspected, simply cycle power to the controller. It is not possible
for this condition to occur under normal operation with both airflow
pickup tubes connected to the controller.
- Physical measurement of the flow pickup pressure for the purpose of
testing is best done with an instrument capable of displaying pressure
to 0.01 ±0.005 in. w.c. Though electronic gauges and sensors often offer
the necessary accuracy, their sensitivity can cause problems in field
applications.
Models available:
1. W7751B2010 Excel 10 VAV II controller compatible Printed Wiring Board
2. W7751C1002 Excel 10 series 1000 VAV controller
3. W7751D2016 Excel 10 VAV II controller with two piece construction and an internally wired subbase
4. W7751E1007 Excel 10 series 1000 VAV controller
5. W7751F2011 Excel 10 VAV controller with two piece construction and an externally wired subbase
6. W7751G1003 Excel 10 series 1000 VAV controller
7. W7751H2025 Excel 10 smart VAV controller with a premounted ML6161 Actuator
8. W7751J2004 Excel 10 smart VAV controller with a premounted ML6161 Actuator
About Us: DtiCorp.Com (http://www.DtiCorp.com)
carries more than 35,000 HVAC products, including industrial,
commercial and residential parts and equipment from Honeywell, Johnson
Contols, Robertshaw, Jandy, Grundfos, Armstrong and more. Our online
catalog is easy to navigate and search, and all products have a picture
and a description. If a customer has any questions about a product, they
can call 800-757-5999 and speak with one of our product experts. Our
mission is to offer the best prices anywhere to our customers.
Julian Arhire
Manager DtiCorp.com
Phone: 954.484.2929
Fax: 954.206.0767
Web: http://www.DtiCorp.com
