Honeywell W7754Q, W7754P, W7754K SPECIFICATION DATA
HONEYWELL EXCEL 5000 OPEN SYSTEM
FEATURES
LONMARK® HVAC profile #8020
Stand-alone operation or on high-speed 78 kilobit
Uses Echelon LonTalk
FTT10A Transceiver
Direct connection of thermal actuators
Direct connection to fan switch
Direct and indirect connection to electrical heat
Factory-configured default parameters
Wide range of supported valves and actuators
Interlocks and time delays to protect equipment
Connected floating actuators exercised once a week
Slim design fits into narrow fan coil units
Terminals all on one side allow controllers to be
GENERAL
The W7754 is a configurable fan coil unit application
controller belonging to the Excel 10 product line for
maintained zones. The W7754 covers a wide range of fan coil
control applications and can operate as a stand-alone unit or
networked using the standard Echelon L
Interfaces are provided for a wide range of actuator types.
Heating systems can be water or electrical, and cooling
systems can be chilled water supply or compressors.
Extensive timing and interlock features make the W7754
especially suitable for systems using electrical heat and
compressors.
ONWORKS
®
bus.
Power supplied by power mains or 24 V
DESCRIPTION
The W7754K,P,Q Controllers provide room temperature
control for two- and four-pipe fan coil units with optional
electrical heating coils (W7754K and W7754P) and can
control single-, two-, or three-speed fans. The units are
provided with default configuration settings from the factory
and are fully operable upon installation. Using standard
Echelon configuration tools, the units can be configured with
job-specific settings. A variety of optional wall modules
interface with the units and provide any or all of the following:
setpoint adjustment, fan speed adjustment, and an occupancy
bypass button. All wall modules include a space temperature
sensor; however, a remote C7068A return air sensor can also
be used.
Excel 10
W7754K,P,Q FCU CONTROLLERS
SPECIFICATION DATA
Echelon® LONWORKS© network
positioned at back of fan coil unit
®
protocol
® U.S. Registered Trademark
Copyright © 2010 Honeywell Inc. • All Rights Reserved EN0B-0453GE51 R0110
W7754K,P,Q FCU CONTROLLERS
Table 1. Overview of equipment (by model)
OS Number
power
supply
digital outputs
digital
inputs
analog inputs
relay
relay
relay
rd
th
triac (open OUT1)"
triac (close OUT1)
triac (open OUT2)
triac (close OUT2)
low-voltage PWM
control of solid-
state relay
LED
configurable digital
input
digital input
(window contact)
AI (fan speed +
occupancy override
switches)
analog input (room
sensor)
analog input (set-
point adjustment
3
4
switch)
230
24
relay
st
1
nd
2
W7754K1001 X X X X X X X X X X X X
W7754P1000 X X X X X X X X X X X X X X X
W7754Q1008 X X X X X X X X X X X X X X X
Sequences
Heat and cool sequences can be selected to be active or not
active, giving a total of eight different sequence options (each
can be with or without fan control):
Heat, only
Cool, only
Heat/cool changeover
Heat and cool sequence
All of the above, plus electrical reheat.
"Unoccupied" Mode
This mode is used for longer unoccupied periods, such as at
night or during weekends and holidays.
Window Open
If the controllers are configured for window open detection,
they automatically disables heat and cool control until the
window is closed again. Frost protection remains active.
Frost Protection
If the temperature drops below 46°F (8°C), the controllers
enable the heating circuit as frost protection.
Smoke Control
The fan can be turned ON or OFF by network command for
smoke control.
Fan Failure
When configured with an air flow detector, the controllers
protect equipment by disabling the system when the fan fails.
Changeover
The controllers operate two-pipe fan-coil units configured with
a changeover input.
Fig. 1. Operational sequence
Modes of Operation
The units have the following modes of operation.
"Occupied" Mode
This is the normal operating condition for a room or zone
when it is occupied. The controllers can be switched into this
mode by a network command, by the room occupancy sensor, or by a bypass button on the wall module. In the
"occupied" mode, the fan is controlled by the setting of the fan
speed switch on the wall module or, when the switch is set to
“auto,” by the control algorithm. The fan can be configured to
remain ON or turn OFF during the zero energy band.
"Standby" Mode
The "standby" mode saves energy by reducing heating or
cooling demand during periods where the room is temporarily
unoccupied. In this mode, the fan is switched OFF within the
zero energy band.
e.g. Excel 10 W7754
FCU Controller
LonWorks network
Honeywell
D-71101 Schönaich
Made in Germany
Fig. 2. Typical application
window
contact
Excel 10
wall module
EN0B-0453GE51 R0110
2
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