Honeywell W7752J, W7754P, W7752G, W7754K, W7752D SYSTEM ENGINEERING
...
Excel 10
W7752D,E,F,G,J AND W7754K,L,M,N,P
FAN COIL UNIT CONTROLLERS
SYSTEM ENGINEERING
CONTENTS
Revision overview ....................................................................................................................................................................... 2
Introduction.................................................................................................................................................................................. 3
Description of Devices.............................................................................................. 3
Products Covered..................................................................................................... 4
Organization of Manual............................................................................................. 4
Applicable Literature................................................................................................. 4
Product Names......................................................................................................... 4
Control Application ................................................................................................... 4
Control Provided....................................................................................................... 5
Setpoints.............................................................................................................. 6
Bypass ................................................................................................................. 7
LED/LCD.............................................................................................................. 7
Energy-Saving Features ...................................................................................... 8
Occupancy Status................................................................................................ 8
Safety Features.................................................................................................... 9
Operating Modes ............................................................................................... 10
Agency Listings ...................................................................................................... 11
Construction ........................................................................................................... 11
Excel 10 W7752 FCU Controllers...................................................................... 11
Excel 10 W7754 FCU Controllers...................................................................... 11
Controller Performance Specifications .............................................................. 13
Configurations ........................................................................................................ 14
General .............................................................................................................. 14
Fan Type............................................................................................................ 14
Type of Heating and Cooling Equipment ........................................................... 15
Reheat Output.................................................................................................... 16
Digital Input........................................................................................................ 16
Excel 10 Wall Module Options........................................................................... 17
Abbreviations and Definitions ................................................................................. 18
Overview................................................................................................................. 19
Step 1. Plan the System ......................................................................................... 19
Application Steps ...................................................................................................................................................................... 19
® U.S. Registered Trademark
Copyright © 2003 Honeywell Inc. • All Rights Reserved
All Rights Reserved EN0B-0377GE51 R0703 (74-2961-5)
Step 2. Determine Other Bus Devices Required .................................................... 19
Step 3. Lay Out Communications and Power Wiring ............................................. 20
ONWORKS Layout.............................................................................................. 20
L
Power Wiring ..................................................................................................... 22
Step 4. Prepare Wiring Diagrams........................................................................... 22
General Considerations ..................................................................................... 22
Terminal Block Assignment and Wiring Example for the W7752 Controller...... 23
Terminal Block Assignment and Wiring for the W7754 Controller..................... 24
ONWORKS Termination ..................................................................................... 25
L
Step 5. Order Equipment........................................................................................ 26
Step 6. Configure Controllers ................................................................................. 28
General .............................................................................................................. 28
Output ................................................................................................................ 29
Input................................................................................................................... 30
Equipment Control ............................................................................................. 31
Fan..................................................................................................................... 31
Switching Levels ................................................................................................ 32
Zone Options ..................................................................................................... 32
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Miscellaneous.....................................................................................................32
PID......................................................................................................................33
Commissioning ...................................................................................................33
ID Number ..........................................................................................................33
Excel 10 FCU Controller Point Mapping.............................................................33
Step 7. Troubleshooting ..........................................................................................35
Troubleshooting Excel 10 FCU Controllers and Wall Modules...........................35
Alarms ................................................................................................................35
Broadcasting the Service Message ....................................................................37
Manual Mode......................................................................................................37
Appendix A. Using E-Vision to Commission a Fan Coil Unit .................................................................................................38
Appendix B. Configuring for Master/Slave Operation.............................................................................................................39
Appendix C. Complete List of Excel 10 FCU Controller User Addresses .............................................................................41
Appendix D. Q7750A Excel 10 Zone Manager Point Estimating Guide.................................................................................82
Temperature Sensor Calibration .............................................................................38
Procedure ...........................................................................................................38
Output Configuration Options..................................................................................39
Input Configuration Options.....................................................................................39
Equipment Control Options .....................................................................................39
Zone Control Options ..............................................................................................39
Network Variable Binding ........................................................................................39
Approximate Memory Size Estimating Procedure...................................................82
REVISION OVERVIEW
On the following pages changes have been made compared to the previous release of this document:
Page: Change:
EN0B-0377GE51 R0703 2
EXCEL 10 FAN COIL UNIT CONTROLLER - SYSTEM ENGINEERING
INTRODUCTION
Description of Devices
The W7752D,E,F,G,J and W7754K,L,M,N,P Fan Coil Unit
(FCU) Controllers all belong to the Excel 10 family product
line. FCU systems control the space temperature in a given
room by regulating the heating and/or cooling equipment
which control the temperature of the air delivered to that
space and the fan which controls air flow. Reheat coils are
often included at the fan coil unit. Excel 10 FCU controllers
are capable of stand-alone operation; however, optimum
functional benefits are achieved when the network
communication capabilities are used.
Excel 500
The zone controlled by the Excel 10 FCU controllers will
typically use an Excel 10 wall module with a temperature
sensor for space temperature measurement, analog setpoint
input, bypass push-button, and occupancy/unoccupancy
override. See page 4 for form numbers of Excel 10 wall
module literature for further information.
The Excel 500 can assume all of the Excel 10 FCU
controllers' scheduling functions. The number of Excel 10
FCU controllers on the L
ONWORKS network is determined by
the rules of LonWorks network design (see Table 10). Frontends can be either EBNI, SymmetriE, or SynOpsys,
depending upon the size and complexity of the connected
system.
PCLTA10
PCC10
Excel 10 W7754
FCU Controller
LonWorks network
ONUNUSED
UNUSED
W7754Kxxxx
0345
WALL MOD.
USED
+ -
RS1A
23D25
LON
Honeywell
DI2
USED
230 Vac, 50/60 Hz
D-71101 Schönaich
max. 5 VA unloaded
Made in Ger man y
GND9LED10FAN11DI2
triac
2 A10A
0.5 A
8
12
321
4 5 6
23247
1314
15 181716
1920
2122
2526
2A/M
IIIII I
DI1
SET
SENS
534
21
T7460 / T7560
LN
com
com
close
open
close
open
GND
230 V
fan
L
OUT1OUT2
230 V
N
230 Vac
Excel 10 W7752
FCU Controller
Excel 10
wall module
Fig. 1. Typical EXCEL 5000® System overview
Excel 10
wall module
3 EN0B-0377GE51 R0703
EXCEL 10 FAN COIL UNIT CONTROLLER - SYSTEM ENGINEERING
Products Covered
This System Engineering Guide describes how to apply the
Excel 10 FCU controller and the accessories to typical FCU
applications. The specific devices covered include:
• W7752D,E,F,G, and J FCU Controllers.
• W7754K,L,M,N, and P FCU Controllers.
• T7460 Wall Modules.
• T7560 Wall Modules.
• for further products, see Appendices.
Organization of Manual
The Introduction and Application Steps 1 through 5 provide
the information needed to make accurate ordering decisions.
Application Step 6 and the Appendices include configuration
engineering that can be started using E-Vision software after
the devices and accessories are ordered. Application Step 7
is troubleshooting. Information provided in support of the use
of third-party L
ONWORKS communication packages to con-
figure FCU Controllers is found in the Appendices.
The organization of the manual assumes a project is being
engineered from start to finish. If you are adding to or
changing an existing system, the Table of Contents can
guide you to the relevant information.
Applicable Literature
The following is a list of documents containing information
related to the Excel 10 FCU Controller and the EXCEL 5000
System in general.
Form No. Title
EN0B-0376GE51 Excel 10 W7752D,E,F,G,J FCU
Controller Specification Data
EN1B-0250GE51 Excel 10 W7752D,E,F,G,J FCU
Controller Installation Instructions
EN1B-0251GE51 Excel 10 W7754K,L,M,N,P FCU
Controller Installation Instructions
74-3083 Excel 10 T7460 Wall Modules
Specification Data
95-7610 Excel 10 T7460 Wall Modules
Installation Instructions
74-3097 Excel 10 T7560 Wall Modules
Specification Data
95-7620 Excel 10 T7560 Wall Modules
Installation Instructions
74-2950 Excel 10 Q7750A, Excel 10 Zone
Manager Specification Data
95-7509 Excel 10 Q7750A Zone Manager
Installation Instructions.
95-7554 Excel 10 FTT/LPT 209541B
Termination Module Installation
Instructions
95-7510 Excel 10 Q7751A Router Installation
Instructions (US only)
95-7511 Excel 10 Q7752A Serial Interface
Installation Instructions (US only)
74-2588 Excel E-Vision User Guide
74-5587 Excel CARE User Guide
74-2039 XBS User’s Manual
74-5018 XBS Application Guide
Product Names
The W7752 Controller is available in five models:
• W7752D FCU Controller with 230 Vac power input and
with reheat relay.
• W7752E FCU Controller with 230 Vac power input without
reheat relay.
• W7752F FCU Controller with 115 Vac power input with
reheat relay.
• W7752G FCU Controller with 115 Vac power input without
reheat relay.
• W7752J FCU Controller with 100 Vac power input without
reheat relay.
The W7754 Controller is available in five models:
• W7754K FCU Controller with 230 Vac power supply, one
triac output, and one digital output for the low-voltage
Pulse-Width Modulated (PWM) control of a solid-state
relay employed in high-current electric reheat
applications
• W7754L FCU Controller with 24 Vac power supply and
two triac outputs
• W7754M FCU Controller with 230 Vac power supply
• W7754N FCU Controller with 230 Vac power supply and
two triac outputs
• W7754P FCU Controller with 230 Vac power supply, four
triac outputs, and an extra, fourth relay
The 2000-series FCU controllers can use any of the following
Excel 10 wall modules:
• T7460A with temperature sensor.
• T7460B with temperature sensor and setpoint adjustment.
• T7460C with temperature sensor, setpoint adjustment,
and bypass button and LED.
• T7460D with temperature sensor, setpoint adjustment and
5-position fan switch.
• T7460E with temperature sensor, setpoint adjustment,
bypass button and LED, and 3-position fan switch.
• T7460F with temperature sensor, setpoint adjustment,
bypass button and LED, and 5-position fan switch.
• T7560A with temperature sensor, unit enable button,
setpoint adjustment, bypass button, LCD display and
configurable fan override with up to five settings.
Other products:
• Q7750A Excel 10 Zone Manager.
• Q7751A Bus Router (US, only).
• Q7752A Serial Adapter (US, only).
• AK3781 L
ONWORKS (non-plenum): 22 AW G (0.325 mm
2
)
twisted pair solid conductor, non-shielded wire (one
twisted pair) (US, only).
• AK3782 L
ONWORKS (non-plenum): 22 AW G (0.325 mm
2
)
twisted pair solid conductor, non-shielded wire (two
twisted pairs) (US, only).
• AK3791 L
ONWORKS (plenum): 22 AW G (0.325 mm
2
)
twisted pair solid conductor, non-shielded wire (one
twisted pair) (US only).
• AK3792 L
ONWORKS (plenum): 22 AW G (0.325 mm
2
)
twisted pair solid conductor, non-shielded wire (two
twisted pairs) (US, only).
• C7608A Return Air Sensor (Europe, only).
Refer to the Table 15 (see section "Step 5. Order
Equipment") for complete listing of all available part numbers.
Control Application
FCU systems in commercial buildings control room
temperature through the control of heat and/or cold water
valves and fan speed. Electric reheat coils may also be used
in the system. The FCU Controller is located in the fan coil
unit and is typically connected to an Excel 10 wall module
which incorporates a temperature sensor, setpoint and fan
EN0B-0377GE51 R0703 4
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
speed controls, and a bypass or override button. Fig. 2
shows a typical FCU control application.
Excel 10 W7754
FCU Controller
ONUNUSED
UNUSED
W7754Kxxxx
DI2
USED
GND9LED10FAN11DI2
8
321 4 5 6 23247
DI1
Honeywell
0345
230 Vac, 50/60 Hz
D-71101 Schönaich
max. 5 VA unloaded
Made in Germany
triac
2 A10A
0.5 A
12
131415 181716
192021 22
2526
2A/M
III II I
LN
com
com
close
open
close
open
SET
GND
230 V
fan
SENS
L
5342 1
OUT1OUT2
230 V
N
T7460 / T7560
230 Vac
WALL MOD.
USED
+ -
RS1A
23D25
LON
wall
contact
Excel 10
wall module
LonWorks network
Fig. 2. Typical Excel 10 FCU control application
Control Provided
The Excel 10 FCU controllers provide room temperature control for two- and four-pipe fan coil units with optional electric
heating coil. The basic control sequence is shown in Fig. 3.
As space temperature falls below the heating setpoint, the
heating output is increased. As space temperature increases
above the cooling setpoint, the cooling output is modulated to
100%. Switching levels for staged heating/cooling and fan
speeds are configurable. The fan may still be configured to
run continuously during the zero energy band in the occupied
mode. Additional configurable fan control features include fan
min. ON and OFF times, run-up times, and overrun times.
The Excel 10 FCU controllers use a PID control algorithm
with which each of the three parameters can be configured.
There are additional configurable boost parameters
(HeatBoost and CoolBoost) which specify a range outside of
which the heating or cooling outputs are turned on fully for
faster response (for thermal actuators this specifies the control hysteresis). The controllers are delivered with factory
defaults for each of the parameters.
5 EN0B-0377GE51 R0703
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Fig. 3. Control sequence diagram
Setpoints
Setpoint Knob
The Excel 10 FCU controllers may be connected to an Excel
10 wall module equipped with a setpoint knob. When
configured (UseWallModSpt), the value from the setpoint
knob is used to calculate the "occupied" setpoint for the
heating and the cooling modes. There are two options
(SptKnob) which determine how the setpoint used by the
control algorithm is calculated: "relative" (or "offset") and
"absolute middle". When configured for "relative", the Excel
10 wall module setpoint knob represents a number from
-9...+9 DDF(-5...+5 K) which is added to the configured
"occupied" and "standby" setpoints for the heating and the
cooling modes (SptCoolOcc and SptHeatOcc). When
SptKnob is set to "absolute middle", the setpoint knob
becomes the mid-point of the Zero Energy Band (ZEB)
extending between the "occupied" or "standby" setpoints for
the heating and the cooling modes. The range of the ZEB is
found by taking the difference between the "occupied" or
"standby" setpoints configured for the heating and the cooling
modes; in the case of "absolute middle", the current
"occupied" and "standby" setpoints are therefore found as
follows:
"occupied" setpoint:
SrcRmTempSptEff (in cooling mode) =
SrcRmTempSptHw + (SptCoolOcc - SptHeatOcc) / 2
SrcRmTempSptEff (in heating mode) =
SrcRmTempSptHw - (SptCoolOcc - SptHeatOcc) / 2
"standby" setpoints:
SrcRmTempSptEff (in cooling mode) =
SrcRmTempSptHw + (SptCoolStby - SptHeatStby) / 2
SrcRmTempSptEff (in heating mode) =
SrcRmTempSptHw - (SptCoolStby - SptHeatStby) / 2
SptKnobLowLim and SptKnobHiLim. In the case of absolute
"occupied" and "standby" setpoints, the setpoint knob still
represents the mid-point of the ZEB, even when set to either
of these limits. The actual setpoints are given by the
equations shown above. When the setpoint knob is configured to be "relative", the lowest actual "occupied" setpoint
allowed is equal to SptHeatOcc - SptKnobLowLim, and the
highest allowed is equal to SptCoolOcc + SptKnobHiLim. The
lowest and highest "standby" setpoints are found in an
analogous way.
Setpoint from Network
When not configured for UseWallModSpt, DestRmTempSpt
must be bound to another node that provides a setpoint.
When bound and when a valid update is received,
DestRmTempSpt is used with the appropriate ZEB:
ZEBoccupied = SptCoolOcc - SptHeatOcc
ZEBstandby = SptCoolStby - SptHeatStby
The "unoccupied" setpoint does not depend on
DestRmTempSpt at all.
Setpoint Offset
Third-party nodes may be bound to DestSptOffset in order to
shift the setpoint in the range of -18...+18 DDF (-10...+10 K).
When in the "unoccupied" mode, the remote setpoint knob is
ignored, and the configured setpoints for those modes are
used instead.
Setpoint Limits
Setpoints are limited to the range of 50...95°F (10...35°C).
The value of the setpoint knob (SrcRmTempSptHw) is limited
to the range provided by the configuration parameters
EN0B-0377GE51 R0703 6
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Table 1. Example setpoint values based upon default configuration – "absolute middle" setpoint knob (°C)
occupancy
mode
"occupied" 23 21 2 21 22 20
"standby" 25 19 6 21 24 18
"unoccupied" 28 16 12 X 28 16
NOTES:
1. Sample value shown. Limited by default configuration settings to the range of 12...30°C.
2. Limited to the range of 10...35°C.
3. = setpoint knob + (ZEB/2)
4. = setpoint knob – (ZEB/2)
Table 2. Example setpoint values based upon default configuration - Relative setpoint knob (°C)
occupancy
mode
"occupied" 23 21 2 -2 21 19
"standby" 25 19 6 -2 23 17
"unoccupied" 28 16 12 X 28 16
NOTES:
1. Sample value shown. Limited by default configuration settings to the range of -5...+5°C.
2. Limited to the range of 10...35°C.
3. = configured cooling setpoint + setpoint knob
4. = configured heating setpoint + setpoint knob
Bypass
Bypass Mode
During periods scheduled as being unoccupied, the Excel 10
wall module's bypass push-button may be used to force the
FCU controller into the "occupied" mode. The FCU controller
can also be forced into the "occupied" mode by means of a
ONWORKS network command (DestManOcc set to
L
OC_BYPASS). The controller will then remain in "bypass"
mode until:
1. The bypass timer has timed out, or
2. The user again presses the Excel 10 wall module's
bypass push-button, thus cancelling the "bypass"
mode, or
3. The occupancy schedule (DestSchedOcc network
input) switches the mode to "occupied".
4. The network input DestManOcc is set to OC_NUL.
The Excel 10 wall module indicates the current bypass mode
status (see Excel 10 wall module literature for further
information).
Bypass Timer
When the "bypass" mode has been activated, the bypass
timer is set to BypTime (default of 180 minutes), at the end of
which the mode will revert to its original state (see Excel 10
wall module literature for further information).
Continuous Unoccupied Mode
The "continuous unoccupied" mode is entered when an Excel
10 wall module is configured to allow it and if :
• (in the case of the T7460) the bypass button is pressed for
four to seven seconds (until the LED blinks),
• (in the case of the T7560) the bypass button is pressed for
more than five seconds (until the flashing moon appears).
configured
cooling setpoint
configured
cooling setpoint
configured
heating setpoint
configured
heating setpoint
ZEB
ZEB
setpoint
knob
setpoint
1
knob
effective cooling
1
effective cooling
setpoint
setpoint
2,3
2,3
effective heating
setpoint
effective heating
setpoint
The FCU controller can also be forced into the "continuous
unoccupied" mode by means of a L
ONWORKS network
command (DestManOcc set to OC_UNOCCUPIED). The
FCU controller will then remain in this mode indefinitely, or
until the bypass button is pressed to exit the mode or a
network command is sent to clear the mode.
Bypass Push-Button
The FCU Controller may be connected to an Excel 10 wall
module equipped with a bypass push-button. There are three
ways to configure the bypass push-button (see Table 17 for
further information):
NONE
BYPASS_UNOCCUPIED
BYPASS_ONLY
Override Priority
The FCU Controller can be configured to arbitrate overrides
coming from the bypass push-button and the L
ONWORKS
network. There are two possible states which have the
following meanings:
LAST_WINS specifies that the last command received
from either the wall module or DestManOcc determines
the effective override state.
NETWORK_WINS specifies that when DestManOcc is not
OC_NUL, then the effective occupancy mode is
determined by DestManOcc regardless of the wall
module override state.
LED/LCD
LED Override
The wall module’s LED indicates that the FCU controller is
being overridden by either the bypass button or the
ONWORKS network.
L
• LED ON "override bypass"
2,4
2,4
7 EN0B-0377GE51 R0703
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
• One flash per second "override unoccupied"
• Two flashes per second "override standby" or
"occupied"
• LED OFF no override
• Four flashes per second The controller is responding
ONWORKS network management wink command.
to a L
LED Occupancy
The wall module’s LED indicates the effective occupancy
mode.
• LED ON effective "occupied" or effective "bypass"
• One flash per second effective "standby"
• LED OFF effective "unoccupied"
• Four flashes per second The controller is responding
ONWORKS network management wink command.
to a L
LCD Display
This mode is used only for T7560 Wall Modules. The
occupancy mode is represented by the following symbols:
effective "occupied" or effective "bypass"
effective "standby"
effective "unoccupied"
Controller is OFF
and Controller is OFF, frost protection is enabled.
Flashing symbols indicate the "override" mode:
override "occupied" or override "bypass"
override "standby"
override "unoccupied"
The controller is responding to a LONWORKS network
management wink command.
Energy-Saving Features
The "Standby" Mode
The digital input for reading input from an occupancy sensor
(usually a motion detector) provides the FCU controller with a
means to enter an energy-saving standby mode whenever
there are no people in the room. The "standby" mode occurs
when the scheduled occupancy mode is "occupied" but the
occupancy sensor indicates that the room is nevertheless
currently unoccupied. If no occupancy sensor is directly connected to the FCU controller, an occupancy sensor from
another node may be bound to the network input
DestOccSensor. The FCU controller can also be forced into
the "standby" mode by means of a L
command (DestManOcc set to OC_STANDBY). When in the
"standby" mode, the FCU Controller uses the "standby"
setpoints configured for the heating and the cooling modes
(SptHeatStby or SptCoolStby).
ONWORKS network
used by binding it to DestWindow. Frost protection remains
active. Normal temperature control resumes when the
window closes.
Demand Limit Control
When a high-electrical-demand signal is received from an
energy management system via the L
ONWORKS network
(DestDlcShed), the FCU controller uses DlcStptBump to shift
the current setpoint (down for heating and up for cooling) by
the configured value to save energy.
Fig. 4. Optimum start (heating)
Optimum Start Gradients
There are two parameters, RecRampCool and
RecRampHeat, that can be configured to cause the cooling
and heating setpoints respectively to ramp up to their
occupied settings from their unoccupied or standby settings
prior to scheduled occupancy. The FCU controller
uses the configured rates to determine the optimum
time to start increasing the heating or cooling
demand. See the following figures. The configuration
parameters are in K/hour.
Fig. 5. Optimum start (cooling)
Window Sensor
The digital input for reading input from a window contact
provides the FCU controller with a means to disable its temperature control activities if someone has opened a window
or door in the room. If no window sensor is directly connected
to the FCU controller, the sensor from another node may be
EN0B-0377GE51 R0703 8
Occupancy Status
The occupancy status is determined based upon Table 3.
Manual override may come from the network input
DestManOcc or from the bypass push-button.
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Table 3. Effective Occupancy Mode Arbitration
scheduled occupancy mode occupancy sensor status manual override status effective operating mode
"occupied" room occupied not assigned OC_OCCUPIED
"occupied" room not occupied not assigned OC_STANDBY
X X "occupied" OC_OCCUPIED
X X "unoccupied" OC_UNOCCUPIED
X X "standby" OC_STANDBY
"occupied" X "standby" OC_OCCUPIED
"standby" X not assigned OC_STANDBY
"standby" X "standby" OC_OCCUPIED
"unoccupied" X not assigned OC_UNOCCUPIED
"unoccupied" X "standby" OC_BYPASS
X=Don't care
Safety Features
Frost Protection
If the room temperature falls below 46.4°F (8°C), the FCU
controller enables the heating circuit to ensure frost protection and an alarm is issued. When the temperature rises
above 48.2°F (9°C) again, the heating circuit is turned OFF
again.
Smoke Control
The FCU controller will respond to L
emergency commands by switching OFF heating/cooling
outputs and switching OFF the fan (depressurize) or
switching ON the fan at its highest speed (pressurize). An
alarm is issued for any emergency commands
ONWORKS network
Fan Failure Protection
When configured with an airflow detector, the FCU controller
protects equipment by switching OFF heating / cooling
outputs and issuing an alarm when the fan fails.
Fan Interlocks
The FCU controller can be configured such that heating
and/or cooling outputs are never ON unless the fan is
running. A fan run-up time can be configured to turn ON the
fan prior to the heating/cooling outputs being switched ON,
and a fan overrun time can be configured to keep the fan
running for a period of time after the heating/cooling outputs
are switched OFF.
9 EN0B-0377GE51 R0703
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Operating Modes
The possible modes of operation are listed in Table 4.
Table 4. Modes of Operation for Excel 10 FCU Controller
mode description events causing a controller to switch to this mode
operational modes (user address: SrcFcuModeS)
START-UP AND
WAIT
FLOATING
OUTPUTS SYNCH
COOLING The FCU controller is controlling in
HEATING The FCU controller is controlling in
MANUAL MODE The control algorithms stay active
FACTORY TEST Control algorithm is disabled; a
DISABLED Control algorithms are terminated,
PRESSURIZE Heating/cooling outputs are switched
DEPRESSURIZE Heating, cooling and fan outputs are
Control algorithms are disabled.
Outputs stay in their initial positions.
Physical inputs are periodically read
and digital filtering of analog inputs is
turned OFF to speed up settling time.
Input NVs are received and output
NVs are sent periodically.
The FCU controller drives the floating
control valves to their initial positions
and then transitions to one of the
control modes.
the cooling mode.
the heating mode.
and outputs are controlled automatically until set individually to test
positions using the network input
nviTest.
special factory test program runs.
outputs are turned OFF (turn-OFF
sequences and interlocks are active).
Frost protection is disabled.
OFF, and the fan is switched ON at
its highest speed.
switched OFF.
This is the first mode after an application restart.
When the effective occupancy changes to "unoccupied" or
"standby", after start-up, after 24 hours since the last positioning,
or after each positioning to 0%, the FCU controller transitions to
this mode.
Input NV (DestHvacMode) has a value of HVAC_COOL or
HVAC_AUTO and the space temperature is above the cooling
setpoint.
Input NV (DestHvacMode) has the value of HVAC_HEAT or
HVAC_AUTO and the space temperature is below the heating
setpoint.
Input NV (DestManMode) has value of MODE_MANUAL.
This mode is for factory testing, only.
Input NV (DestManMode) has a value of MODE_DISABLED.
Input NV (DestEmerg) containing smoke control signal from C-
Bus has the value of EMERG_PRESSURIZE.
Input NV (DestEmerg) containing smoke control signal from C-
Bus has the value of EMERG_DEPRESSURIZE.
EN0B-0377GE51 R0703 10
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Agency Listings
Table 5 provides information on agency listings for Excel 10 FCU Controller products.
Table 5. Agency listings
device agency comments
W7752D to J
FCU Controller
W7752D to J
FCU Controller
W7752D to G
FCU Controller
W7752D to G
FCU Controller
W7754K FCU Controller ??? ???
W7754L FCU Controller ??? ???
W7754M FCU Controller ??? ???
W7754N FCU Controller ??? ???
W7754P FCU Controller ??? ???
CE General Immunity per European Consortium standards EN50081-1 (CISPR 22
Class B) and EN 50082-1:1992 (based on Residential, Commercial, and Light
Industrial).
EN 61000-4-2 IEC 1000-4-2 (IEC 801-2) Electromagnetic Discharge.
EN 50140, EN 50204 IEC 1000-4-3 (IEC 801-3) Radiated Electromagnetic Field.
EN 61000-4-4 IEC 1000-4-4 (IEC 801-4) Electrical Fast Transient (Burst).
Radiated Emissions and Conducted Emissions.
EN 55022:1987 Class B.
CISPR-22: 1985.
FCC Complies with requirements in FCC Part 15 rules for a Class B Computing
Device.
UL Tested and listed under UL 916 (file number E87744).
Ambient Temperature Rating: 32...122 °F (0...50 °C).
cUL Tested and listed under UL 916 (file number E87744).
Ambient Temperature Rating: 32...122 °F (0...50 °C).
Construction
Excel 10 W7752 FCU Controllers
The Excel 10 W7752 FCU Controller is available in five basic
models, each with two different possibilities for L
transceivers. All of these controllers are mains-powered, and
two models are equipped with an additional high-power relay
for applications with electric reheat. Table 6 shows the
differences between models.
Table 6. Excel 10 W7752 FCU Controller models
OS number Power input Reheat relay
W7752D2007 230 Vac X
W7752E2004 230 Vac
W7752F2002 115 Vac X
W7752G2000 115 Vac
W7752J2003 100 Vac
All wiring connections to the controllers are made at screw
terminal blocks accessible beneath a plastic safety cover.
Mounting dimensions are shown in Fig. 6.
ONWORKS
Excel 10 W7754 FCU Controllers
The Excel 10 W7754 FCU Controller is available in five basic
models, each with two different possibilities for L
transceivers. Table 7 shows the differences between models.
Table 7. Excel 10 W7754 FCU Controller models
OS number Power input Reheat relay
W7754K1001 230 Vac X
W7754L1009 24 Vac
W7754M1007 230 Vac
W7754N1004 230 Vac
W7754P1000 230 Vac
ONWORKS
CAUTION
If FCU Controllers are mounted vertically and thermal
actuators are used, the transformer must not be
located below the electronics due to heating effects.
WARNING
Electrical Shock Hazard.
Mains power at terminal block can cause personal
injury or death. FCU Controllers must be mounted
inside their fan coil unit boxes to prevent access by
unauthorized personnel.
To reduce the risk of fire or electric shock, install in a
controlled environment relatively free of contaminants.
11 EN0B-0377GE51 R0703
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Fig. 6. W7752 construction in inches (mm)
WALL MOD.
+ -
RS1A
59.5180
ONUNUSED
UNUSED
DI2
USED
USED
GND9LED10FAN11DI2
8
321 4 5 6 23247
DI1
SET
5342 1
T7460 / T7560
SENS
23D25
LON
12
GND
0345
230 V
W7754Kxxxx
230 Vac, 50/60 Hz
max. 5 VA unloaded
1314 15 181716
L
N
2 A10A
III II I
Honeywell
D-71101 Schönaich
Made in Germany
triac
0.5 A
1920 2122
close
fan
OUT1 OUT2
230 Vac
2526
2A/M
LN
com
com
open
open
close
230 V
Fig. 7. "7754 dimensions (in mm)
130
110
90
terminal protection
cover (optional)
EN0B-0377GE51 R0703 12
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Controller Performance Specifications
Power:
W7752D and W7752E; W7754K,M,N,P
230 Vac +10%, -15%, 50/60 Hz.
W7752F and W7752G
115 Vac +10%, -15%, 50/60 Hz.
W7752J
100 Vac ±6%, 50/60 Hz.
W7754L
24 Vac ±20%, 50/60 Hz.
Operating Temperature:
32...122°F (0...50°C).
Shipping/Storage Temperature:
-40...+158°F (-40...+70°C).
Relative Humidity:
5% to 95% non-condensing
Inputs:
Temperature Sensor:
20k ohm NTC
Setpoint Potentiometer:
10k ohm
Digital Input:
Closed ≤ 400 ohms
Open ≥ 10 K ohms
Outputs:
Triac voltage range:
24 Vac ± 20%.
Triac max. current ratings:
250 mA continuous
650 mA surge for 30 sec.
IMPORTANT:
When any device is energized by a Triac, the device
must be able to sink a minimum of 15 mA. If nonHoneywell motors, actuators, or transducers are to be
used with Excel 10 FCU Controllers, compatibility must
be verified.
nviSpaceTemp
nv1
SNVT_temp_p
nviSetPoint
nv2
SNVT_temp_p
nviFanSpeedCmd
nv6
SNVT_switch
nviOccCmd
nv7
SNVT_occupancy
nviApplicMode
nv8
SNVT_hvac_mode
nviSetPtOffset
nv9
SNVT_temp_p
nviWaterTemp
nv10
SNVT_temp_p
nviDischAirTemp
nv17
SNVT_temp_p
nviEnergyHoldOff
nv18
SNVT_switch
Hardware
Output
Fan Coil Unit Controller
Object #8020
nvoHeatOutput
nv3
SNVT_lev_percent
Mandatory
Network
Variabl es
Optional
Network
Variabl es
nvoCoolOutput
nv4
SNVT_lev_percent
nvoFanSpeed
nv5
SNVT_switch
nvoTerminalLoad
nv11
SNVT_lev_percent
nvoLoadAbs
nv12
SNVT_power
nvoDischAirTemp
nv13
SNVT_temp_p
nvoReheat
nv14
SNVT_switch
nvoSpaceTemp
nv15
SNVT_temp_p
nvoEffectSetPt
nv16
SNVT_temp_p
nvoEffectOcc
nv19
SNVT_occupancy
nvoEnergyHoldOff
nv20
SNVT_switch
nvoUnitStatus
nv21
SNVT_hvac_status
Configuration Properties
nc49 - nciSndHrtBt SNVT_time_sec mandatory
nc52 - nciMinOutTm SNVT_time_sec optional
nc48 - nciRcvHrtBt SNVT_time_sec optional
nc17 - nciLocation SNVT_str_asc optional
nc60 - nciSetPnts
nc59 - nciNumValve
SNVT_temp_setpt
SNVT_count
mandatory
optional
Fan relays voltage range:
20 to 253 Vac
Fan relays max. current rating:
3 A
Electric reheat relay voltage range:
20 to 253 Vac
Electric reheat relay max. current rating:
10 A
6 A (UL916)
Interoperability
The W7752 Controllers use the LonTalk protocol. They
support the L
ONMARK Functional Profile # 8020 “Fan Coil Unit
Controller”, version 2.0. Fig. 8 shows the implementation
used.
nviSensorOcc
SNVT_Occupancy
Manufacturer
Defined
nvoSensorOcc
SNVT_occupancy
Section
nviEmerg
SNVT_hvac_emerg
nviReheatRelay
SNVT_switch
nvoDigitInState
SNVT_switch
Hardware
Input
NOT SUPPORTED.
Fig. 8. LONMARK FCU object profile
13 EN0B-0377GE51 R0703
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Configurations
General
The following sections provide an overview of the Excel 10
FCU Controller options related to inputs and outputs. See
section "Step 6. Configure Controllers" (page 28) for a
complete list of configuration options and defaults.
Table 8. Hardware options summary
option possible configurations
fan type no fan
fan interlock enabled
FCU system type two-pipe
output 1 actuator type floating
output 2 actuator type floating
valve direction direct
reheat none
digital input not used
wall module option local
temperature sensor
type
NOTE:
1
The floating-mid option is only for changeover applications
and uses only one of the two outputs.
one-speed
two-speed
three-speed
disabled
four-pipe
floating mid (one for heat/cool)
one-stage
two-stage
three-stage
PWM
thermal
floating mid (one for heat/cool)
one-stage
two-stage
three-stage
PWM
thermal
reverse
reheat (W7752D and F only)
free use (W7752D and F only)
W7754?
window closed
occupied sensor
air flow detector
cool changeover
window open
unoccupied sensor
no air flow
heat changeover
movement
no movement
shared
none
NTC non-linearized
1
1
Fan Type
Each fan coil unit controlled by an FCU controller can have a
fan with up to three different speeds or no fan at all. Multispeed fans are switched at the same switching levels as
multi-staged heating control points (see Fig. 9). For example,
a three-speed fan will switch ON its first speed at the same
control level as the first stage of heating or cooling up until
the second stage of heating or cooling where the second fan
speed will switch ON. A two-stage fan will switch with the first
two stages of a 3-stage heating or cooling system. Likewise,
a single-speed fan will turn ON at the first stage of any multistaged system. Conversely, a multi-speed fan may follow
multiple switching levels even for single-staged, floating,
PWM, or thermal actuator-based systems.
Hysteresis
The hysteresis for fan speed extends to the next lower
switching level (or a control level of 0) as is shown in Fig. 9.
For example, the second fan speed will remain ON until the
control level falls below the switching point for the first fan
speed. Min. ON and OFF times can be configured and will
apply to all fan switching points.
Interlock
A fan interlock can be configured which prevents heating or
cooling outputs from being turned ON in the event of a fan
failure (where an air flow detector is installed to detect fan
failure). When fan interlock is configured, run-up and overrun
times can be configured to delay switching ON the heating or
cooling equipment after switching ON the fan and delay
switching OFF the fan after the heating or cooling equipment
is switched OFF.
The fan can be configured to run continuously during the
zero energy band during occupied periods.
EN0B-0377GE51 R0703 14
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Fig. 9. Three-speed fan switching and hysteresis, cooling mode (defaults for switching levels shown)
Type of Heating and Cooling Equipment
The FCU controller can operate with either two-pipe or fourpipe systems. A two-pipe system requires a changeover input
to the controller (hardware or network input).
The FCU controller can operate with a variety of actuators for
heating and cooling equipment. Floating actuators can be
used which will require specifying the valve run time during
configuration of the controller. Valve action can be configured
as either direct or reverse. When in a two-pipe system with a
changeover input, a floating actuator can be used which has
the middle position (50%) as the zero energy position. The
cool range is then 0 to 50% and the heat range 50 to 100%.
The output must be configured as floating-mid.
Multi-stage systems can be controlled with up to three
different stages of heating/cooling control. Switching levels
are specified in % of control level (see Fig. 10) as is a
hysteresis setting which applies to all switching levels.
Heating and cooling switching levels and hysteresis are
specified separately. Min. OFF times can be configured, and
for one-, two- and three-stage systems, a min. ON time can
also be configured.
PWM electronic valves and thermal actuators can also be
connected and can be configured as either direct or reverse
action. The cycle time must be specified during configuration.
In the case of PWM valves, the zero and full positions must
also be configured.
Fig. 10. Three-stage heating/cooling switching (defaults for switching levels and hysteresis shown)
15 EN0B-0377GE51 R0703
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Reheat Output
W7752D and F Controllers have an additional high-current of
10 A max. (UL916: 6 A max.) output relay to control an electric reheater (refer to Fig. 2 for sample application). The
reheat output has its own switching level and hysteresis
settings (see Fig. 11). The reheat relay may also be used as
an auxiliary output for other purposes, in which case the
W7752 must be configured to specify that the output is under
the control of the L
control algorithm.
Fig. 11. Reheat switching and hysteresis (defaults
ONWORKS network, and not of the FCU
shown)
Digital Input
There is a single digital input in the W7752 Controller which
may be configured to accommodate an occupancy sensor, a
window open/closed contact, an air flow detector (for fan
failure detection), or a changeover input. It is possible to
configure this input for either normally-open or normallyclosed contacts for any of the switches.
The control algorithm in the Excel 10 FCU controller uses the
occupancy sensor, if configured, to determine the effective
occupancy mode (see Table 3). If the Time Of Day (TOD)
schedule indicates an occupied state, and the eccupancy
sensor contact is closed, the effective occupancy mode will
be "occupied". However, if the TOD schedule indicates an
occupied state and the occupancy sensor contact is open,
then the effective occupancy mode will be "standby". The
control algorithm will then control according to the "standby"
setpoints configured for the heating and the cooling modes.
Configuring the digital input for movement or no movement
(dependent upon normally-open or normally-closed contacts)
adds a delay of 15 minutes to the occupancy sensor such
that the space is considered occupied until 15 minutes has
elapsed since the last movement is detected.
If the digital input is configured to read input from a window
open/closed contact, heating, cooling, and fan control will be
disabled while the window is detected open. Frost protection
will be enabled. A set of contacts may be wired in series for
multiple windows. If the window open/closed contact is not
configured, a one-to-one association (binding) of the window
sensor from another controller on the L
can be made. A locally-wired contact can also be used in
combination with the network input, the result being a logical
OR of the inputs.
If the digital input is configured to read input from an air flow
detector (fan status), heating and cooling control will be
disabled for a fan failure (fan ON and no air flow detected).
The input may also be configured for changeover for a twopipe system.
NOTE: The Excel 10 FCU Controller has limited power
available (only 1.5 mA/4.8 V) for checking the digital
input for contact closures. Ensure that contacts
used remain within the specified resistance
tolerance range (closed ≤ 400 ohms) even when
aged.
ONWORKS network
EN0B-0377GE51 R0703 16
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Excel 10 Wall Module Options
A typical FCU installation will include an Excel 10 wall
module containing a 20k ohm NTC room temperature sensor
and additional features depending on the wall module type
(see Excel 10 wall module literature for further information).
The FCU controller can use a return air sensor rather than
the sensor in the wall module if it is wired to the wall module
sensor input. Setpoint adjustments can be configured as
relative or absolute, and upper and lower limits can be set. A
configuration option for the fan speed switch allows it to be
disabled if not required. The bypass button can be configured
to override the control mode to "occupied" for a configurable
bypass time and to override the control mode to
"unoccupied" for an indefinite time, or it may be configured to
only override to "occupied". The button may also be used to
cancel the override.
Common Temperature Control (Master/Slave Controllers)
When one or more FCU controllers serve a common area
and a single temperature sensor is to be used, a
master/slave arrangement can be configured. One Excel 10
FCU Controller is configured for the local wall module with
the desired options. The other Excel 10 FCU Controller(s) will
be configured without wall modules and with certain network
variables bound with the master controller. Refer to
Application Step 6 of this document for more details.
IMPORTANT
The slave units must have the same HVAC equipment
connected to it as the master units.
The slave units will not use any internal temperature
setpoints or control algorithms. The master controller
determines heating/cooling output based upon setpoints
and occupancy and L
ONWORKS network command
mode status and communicates this to the slave via the
ONWORKS network.
L
17 EN0B-0377GE51 R0703
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Abbreviations and Definitions
CARE Computer Aided Regulation Engineering;
C-Bus Honeywell proprietary Control Bus for
CPU Central Processing Unit; an EXCEL 5000
Echelon
EMS Energy Management System; refers to the
EEPROM Electrically Erasable Programmable Read
EPROM Erasable Programmable Read Only
E-Vision PC-based tool used for configuration and
Excel 10 Zone Manager - A controller that is used to
Firmware Software stored in a nonvolatile memory
the PC based tool used to configure C-Bus-
Bus devices.
communications between EXCEL 5000
System controllers and components.
System controller module.
®
The company that developed the
ONWORKS
L
®
network and the Neuron
chips used to communicate on it.
EMI Electromagnetic Interference; electrical
noise that can cause problems with
communications signals.
controllers and algorithms responsible for
calculating optimum operational
parameters for max. energy savings in the
building.
Only Memory; the variable storage area for
saving user setpoint values and factory
calibration information.
Memory; the firmware that contains the
control algorithms for the Excel 10 FCU
Controller.
commissioning of Excel 10 devices.
interface between the C-Bus and the
ONWORKS network. The Excel 10 Zone
L
Manager also has the functionality of an
Excel 100 Controller, but has no physical
I/O points. (Note: The Q7750A Zone
Manager may be referred to as E-Link.)
medium such as an EPROM.
I/O Input/Output; the physical sensors and
actuators connected to a controller.
I x R I times R or current times resistance; refers
to Ohms Law: V = I x R.
K Kelvin.
LiveCARE The PC based tool used to monitor and
®
ONWORKS Echelon® LONWORKS® network for
L
®
change parameters in C-Bus devices.
communication among Excel 10 FCU
controllers.
NEC National Electrical Code; the body of
®
standards for safe field-wiring practices.
NEMA National Electrical Manufacturers
Association; the standards developed by an
organization of companies for safe field
wiring practices.
NV Network Variable; an Excel 10 FCU
controller parameter that can be viewed or
modified over the L
ONWORKS network.
OEM Original Equipment Manufacturer; the
company that builds the fan coil units.
PC Personal Computer.
Pot Potentiometer. A variable resistance
electronic component located on Excel 10
wall modules. Used to allow user-adjusted
Setpoints to be inputted into the Excel 10
FCU Controller.
segment A L
ONWORKS section containing no more
than 60 Excel 10s. Two segments can be
joined together using a router.
Subnet An L
ONWORKS segment that is separated
by a router from its Q7750A Zone Manager.
TOD Time-Of-Day; the scheduling of Occupied
and Unoccupied times of operation.
VA Volt Amperes; a measure of electrical
power output or consumption as applicable
to an ac device.
Vac Voltage alternating current; ac voltage as
opposed to dc voltage.
XBS Excel Building Supervisor; a PC based tool
for monitoring and changing parameters in
C-Bus devices.
EN0B-0377GE51 R0703 18
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
APPLICATION STEPS
Overview
Steps one through seven, see Table 9, address considerations for engineering an Excel 10 FCU System. These
steps are guidelines intended to aid understanding of the product I/O options, bus arrangement choices, configuration
options and the Excel 10 FCU Controllers’ role in the overall
EXCEL 5000
Step No. Description
Step 1. Plan the System
Plan the use of the FCU controllers according to the job
requirements. Determine the location, functionality and
sensor or actuator usage. Verify the sales estimate of the
number of FCU controllers and wall modules required for
each model type. Also check the number and type of output
actuators and other accessories required.
When planning the system layout, consider potential expansion possibilities to allow for future growth. Planning is
very important to be prepared for adding HVAC systems and
controllers in future projects.
®
System architecture.
Table 9. Application steps
1 Plan the System
2 Determine Other Bus Devices Required
3 Lay out Communication and Power Wiring
4 Prepare Wiring Diagrams
5 Order Equipment
6 Configure Controllers
7 Troubleshooting
notebook PC
using E-Vision
shielded
interface
cable
Excel 10
FCU
RS-232
serial
port
SLTA
controller
LonWorks
port
The L
ONWORKS communication loop between controllers
must be laid out according to the guidelines applicable for
that topology. FCU Controllers use FTT technology which
allows daisy chain, star, loop or combinations of these bus
configurations. See section "Step 3. Lay Out
Communications and Power Wiring" (page 20) for more
information on bus wiring layout, and see Fig. 13, Fig. 14,
and Fig. 15 in section "Step 4. Prepare Wiring Diagrams"
(page 22) for wiring details.
It is important to understand the interrelationships between
FCU controllers on the L
ONWORKS network early in the job
engineering process to ensure their implementation when
configuring the controllers. (See section "Step 6. Configure
Controllers" [page 28] for information on the various Excel 10
FCU Controller parameters and on Excel 10 FCU Controller
point mapping.)
Step 2. Determine Other Bus Devices
Required
A max. of 62 nodes can communicate on a single LONWORKS
segment. If more nodes are required, a router is necessary.
Using a router allows up to 125 nodes, divided between two
ONWORKS segments. The router accounts for two of these
L
nodes (one node on each side of the router); a Q7750A Excel
10 Zone Manager can take one node and two slots are
available for operator terminal nodes, leaving 120 nodes
available for Excel 10 FCU Controllers. All 120 controllers are
able to communicate through the router. A Q7750A Excel 10
Zone Manager is required to connect the L
to the standard EXCEL 5000 System C-Bus. Each Excel 10
Zone Manager can support no more than 120 W7752s. This
is a limit set in the Excel 10 Zone Manager database and is
an absolute maximum.
ONWORKS segment is set up with two unused nodes to
Each L
allow for an E-Vision operator terminal to be connected to the
ONWORKS network. Multiple E-Vision terminals can be
L
connected to the bus at the same time. Table 10 summarizes
ONWORKS segment configuration rules.
the L
ONWORKS network
Fig. 12. Connecting the portable operator terminal to the
ONWORKS network
L
19 EN0B-0377GE51 R0703
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Table 10. LonWorks configuration rules and device node numbers
One L
ONWORKS Segment Example max. number of nodes equals 62
one Q7750A Excel 10 Zone Manager 1 node
port for operator terminal access (E-Vision) 1 node
max. number of Excel 10 Controllers 60 nodes (wall modules are not LONWORKS nodes)
Total 62 nodes
Two LONWORKS Segments Example max. number of nodes equals 125
one Q7750A Excel 10 Zone Manager 1 node
one Q7751A Router 2 nodes (1 in each Bus Segment)
ports for operator terminal access (two E-Vision terminals) 2 nodes (1 in each Bus Segment)
max. number of Excel 10 Controllers in segment number one 60 nodes (wall modules are not LONWORKS nodes)
max. number of Excel 10 Controllers in segment number two 60 nodes (wall modules are not LONWORKS nodes)
Total 125 nodes
The max. length of an FTT LONWORKS segment is 4600 ft
(1400 m) for a daisy chain configuration or 1650 ft (500 m)
total wire length and (400 m) node-to-node for any other type
of configuration.
NOTE: In the case of FTT L
ONWORKS segments, the
distance from each transceiver to all other transceivers and to the termination must not exceed the
max. node-to-node distance. If multiple paths exist,
the longest one should be used for the calculation.
If longer runs are required, add a Q7751A Router to partition
the system into two segments. It is not legal to use more than
one router per Excel 10 Zone Manager.
In addition, all L
a Bus Termination Module. For an FTT L
ONWORKS segments require the installation of
ONWORKS segment,
one or two Termination Modules may be required depending
upon the bus configuration. See section "Step 3. Lay Out
Communications and Power Wiring" (page 20) and the
ONWORKS Termination Module subsection in section "Step
L
4. Prepare Wiring Diagrams" (page 22) for more details.
Step 3. Lay Out Communications and Power
Wiring
LONWORKS Layout
The communications bus, LONWORKS, is a 78-kilobit serial
link that uses transformer isolation and differential
Manchester encoding. Wire the L
AWG or plenum rated level IV 22 AWG non-shielded, twisted
pair, solid conductor wire as the recommended wire size (see
Table 11 for part numbers). An FTT L
in daisy chain, star, loop or any combination thereof as long
as the max. wire length requirements given in Step 2 are met.
NOTE: Due to the transformer isolation, the bus wiring does
not have a polarity; that is, it is not important which
of the two L
ONWORKS terminals are connected to
each wire of the twisted pair.
LONWORKS networks can be configured in a variety of ways,
but the rules listed in Table 10 always apply. Fig. 13 and Fig.
14 depict two typical daisy chain L
one as a single bus segment that has 60 nodes or less, and
one showing two segments. Fig. 15 shows examples of free
topology bus layouts using 2000-series devices. The bus
configuration is set up using the Network Manager tool from
within E-Vision (see the E-Vision User Guide).
ONWORKS using level IV 22
ONWORKS can be wired
ONWORKS network layouts;
Note: C7750A Zone Manager has internal termination module (with jumpers installed as shown).
Fig. 13. LONWORKS wiring layout for one daisy-chain network segment
EN0B-0377GE51 R0703 20
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Fig. 14. LONWORKS wiring layout for two daisy-chain network segments
Fig. 15. Free topology LONWORKS layout examples
NOTE: See section "L
ONWORKS Termination" on page 25
for additional details.
IMPORTANT
Notes on Communications Wiring:
• All field wiring must conform to local codes and
ordinances.
• Do not use different wire types or gauges on the
ONWORKS segment. The step change in
same L
line impedance characteristics would cause
unpredictable reflections on the L
ONWORKS net-
work. When using different types is unavoidable,
use a Q7751A Router at the junction.
21 EN0B-0377GE51 R0703
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
• Do not use shielded cable for LONWORKS wiring
runs. The higher capacitance of the shielded
cable will cause degradation of communications
throughput. In noisy (high EMI) environments,
avoid wire runs parallel to noisy power cables, or
lines containing lighting dimmer switches, and
keep at least 3 in. (76 mm) of separation
between noisy lines and the L
• Make sure that neither of the L
grounded.
Power Wiring
IMPORTANT
Notes on Power Wiring:
• All field wiring must conform to local codes and
ordinances.
• Use the heaviest gauge wire available, up to
14 AWG (2.0 mm
(1.0 mm
connections.
• To minimize EMI noise, do not run Triac and/or
relay output wires in the same conduit as the
input wires or the L
loop.
ONWORKS cable.
ONWORKS wires is
2
2
) for all power and earth ground
) with a minimum of 18 AWG
ONWORKS communications
• To comply with CE requirements, in the case of
devices having a voltage range of 50 to 1000
Vac or 75 and 1500 Vdc which are not provided
with a supply cord and a plug or with other
means for disconnection from the supply having
a contact separation of at least 3 mm in all poles,
the means for disconnection must be
incorporated in the fixed wiring.
Step 4. Prepare Wiring Diagrams
General Considerations
The purpose of this step is to assist the application engineer
in developing job drawings to meet job specifications. Wiring
details for the W7752 FCU Controller are shown in Fig. 17.
Table 12 gives additional details for output connections.
NOTE: For field wiring, when two or more wires are to be
attached to the same connector block terminal, be
sure to twist them together. Deviation from this rule
can result in improper electrical contact. See Fig.
16.
Table 11 lists wiring types, sizes, and length restrictions for
Excel 10 FCU Controller products.
Table 11. Field wiring reference table (US part numbers shown)
wire
function
LONWORKS
(plenum)
LONWORKS
(nonplenum)*
input
wiring,
sensors,
contacts
output
wiring,
actuators,
relays
power
wiring
recommended
min. wire size
AWG (mm
2
)
22 AWG
22 AWG
14 to 20 AWG
(2.0 to 0.5 mm
14 AWG (2.5 mm
(18 AWG (1.0
2
) acceptable
mm
for short runs)
14 AWG
(2.5 mm
2
)
construction
twisted pair solid
conductor, non-shielded.
twisted pair solid
conductor, non-shielded.
multi-conductor (usually
five-wire cable bundle); for
2
runs >100 ft (30 m),
)
twisted pair or shielded
cable is recommended.
2
)
any pair non-shielded (use
heavier wire for longer
runs).
any pair non-shielded (use
heavier wire for longer
runs).
specification
or
requirement
Level IV 140°F
(60°C) rating
Level IV 140°F
(60°C) rating
140°F (60°C)
rating
NEC Class 2
140°F (60°C)
rating
NEC Class 2
140°F (60°C)
rating
NOTE: PVC wire must not be used where prohibited by local fire regulations.
vendor wire type max. length ft (m)
Honeywell (US)
AK3791 (one twisted pair)
AK3792 (two twisted pairs)
See Step 2
(Europe: Belden
9H2201504)
Honeywell (US)
AK3781 (one twisted pair)
AK3782 (two twisted pairs)
See Step 2
(Europe: Belden
9D220150)
Standard thermostat wire 82.5 ft (25 m)
Honeywell (US)
AK3702 (18 AWG)
AK3712 (16 AWG)
200 ft (60 m)
AK3754 (14 AWG)
or equivalent
Honeywell (US)
AK3754 (14 AWG)
(twisted pair)
AK3909 (14 AWG) single
conductor or equivalent
Limited by line loss
effects on power
consumption.
(See Line Loss
subsection.)
EN0B-0377GE51 R0703 22
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Terminal Block Assignment and Wiring Example for the W7752 Controller
Fig. 17 illustrates terminal block assignments and wiring for
an example Excel 10 W7752 FCU Controller installation. All
connections are made at terminal blocks. Table 12 lists
wiring information for wiring all of the possible actuator types.
REHEAT
+
1. STRIP 1/2 IN. (13 MM) FROM WIRES
TO BE ATTACHED AT ONE
TERMAINAL
Fig. 16. Attaching two or more wires at terminal blocks
OCCUPANCY SENSOR
CHANGEOVER CONTACT
AIRFLOW CONTACT
WINDOW CONTACT
MOTION SENSOR
WALL MODULE
CONNECTIONS
HEAT
COM
-
COOL
FAN
LO
MED
HI
RETURN
OPEN
CLOSE
POWER MAINS
2. TWIST WIRES TOGETHER WITH
PLIERS (A MINIMUM OF THREE
TURNS).
LONW
ORKS
NETWORK IN
L
ONWORKS
L
N
COM
+
OPEN
CLOSE
NETWORK OUT
3. CUT TWISTED END OF WIRES TO 3/16 IN. (5 MM) BEFORE
INSERTING INTO T ERMINAL AND TIGHTENI NG SCREW. THEN
PULL ON EACH WIRE IN ALL TERMINALS TO CHECK FOR GOOD
MECHANICAL CONNECTION.
W7752 FAN COIL UNIT CONTROLLER
D
G
N
D
1
T
A
D
G
I
I
L
N
I
P
U
T
4A
0.5A
16A
2
3
LED
SETPOINT
4
FAN / BYPASS
5
TEMP SENSOR
6
AGND
7
8
E-BUS IN
9
E-BUS IN
10
E-BUS OUT
11
12
E-BUS OUT
OUT 1 COM
13
OUT 1 OPEN
14
OUT 1 CLOSE
15
16
OUT 2 COM
OUT 2 OPEN
17
OUT 2 CLOSE
18
19
RELAY COM
20
RELAY 1
21
RELAY 2
22
RELAY 3
23
SUPPLY VOLT
24
SUPPLY VOLT
PWR RELAY IN (D,F MODELS ONLY)
25
26
PWR RELAY OUT (D,F MODELS ONLY)
Fig. 17. W7752 FCU Controller wiring example
23 EN0B-0377GE51 R0703
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Table 12. Output assignments for various actuator types
Output type
13 14 15 16 17 18
Out 1 Terminal Out 2 Terminal
Floating 24 Vac open close 24 Vac open close
1-stage 24 Vac on/OFF — 24 Vac on/OFF —
2-stage 24 Vac stage 1 stage 2 24 Vac stage 1 stage 2
3-stage
24 Vac stage 1 stage 2 24 Vac stage 1 stage 2
stage 3 stage 3
PWM 24 Vac PWM — 24 Vac PWM —
Thermal 24 Vac on/OFF — 24 Vac on/OFF —
Terminal Block Assignment and Wiring for the W7754 Controller
Table 13 lists the terminals and their functions of the Excel 10 W7754 FCU Controller. In addition to connections made at
terminal blocks, there is an extra socket located to the left of the terminal blocks containing a digital output for the low-voltage
PWM control of a solid-state relay employed in high-current electric reheat applications. Table 13 lists wiring information for
wiring all of the possible actuator types.
Table 13. W7754 Controller, terminals and functions
term. # function
1 receiving/sending data on the LONWORKS network
2 receiving/sending data on the LONWORKS network
3 a digital input, configurable (using the LNS plug-in) to read input e.g. from a window contact, an occupancy sensor,
4 an analog input, permanently configured to read input from a wall module's temperature setpoint adjustment knob
5 an analog input, permanently configured to read input from a room temperature sensor.
6GND
7 not present
8GND
9 a digital output, permanently configured to write output switching the wall module's LED "on" or "OFF"
10 an analog input, permanently configured to read input on whether the wall module's 3-speed fan control knob has
11
12 not present
13+14 relay 4, permanently configured to switch a hardwired electrical reheat coil ON or OFF
15 common terminal for terminals 16, 17, and 18
16
17
18
19 a triac output, permanently configured to write output to OUT1, closing it
20 a triac output, permanently configured to write output to OUT1, opening it
21 a triac output, permanently configured to write output to OUT2, closing it
22 a triac output, permanently configured to write output to OUT2, opening it
23 a common terminal for terminals 19 and 20
24 a common terminal for terminals 21 and 22
25 the "N" terminal of the power supply
26 the "L" terminal of the power supply
(1)
This digital input can be enabled / disabled using the right DIP switch located on the top of the controller.
(2)
If all three relays (terminals 16, 17, and 18) are switched OFF, then the three-speed fan is switched OFF.
etc.
been set to AUTO, OFF, LOW, MEDIUM, or HIGH and whether the wall module's "occupancy override" button has
been pressed.
(1)
a digital input, permanently configured to read input on whether a window contact is "open" or "closed".
(2)
relay 3, permanently configured to write output to a three-speed fan, setting it to HIGH
(2)
relay 2, permanently configured to write output to a three-speed fan, setting it to MEDIUM
(2)
relay 1, permanently configured to write output to a three-speed fan, setting it to LOW
The triac outputs or relay outputs of the Excel 10 W7754 FCU Controller can be configured (using Honeywell's LNS plug-in) for
different functions.
You can configure the four triac outputs for connection to either a floating drive or to a thermal actuator. Once the outputs have
been configured, the corresponding devices can be directly connected to them.
EN0B-0377GE51 R0703 24
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Table 14. Output assignments of Excel 10 W7754 FCU Controller for various actuator types
output type stage
19 20 21 22
floating -- close open close open
1-stage
0--OFF--OFF
1--ON--ON
0 OFF OFF OFF OFF
1 OFF ON OFF ON2-stage
2 ON OFF ON OFF
0 OFF OFF OFF OFF
3-stage
1 OFF ON OFF ON
2 ON OFF ON OFF
3 ONONONON
PWM -- -- PWM -- PW M
thermal -- -- ON/OFF -- ON/OFF
OUT1 OUT2
LONWORKS Termination
One or two LONWORKS terminations are required, depending
on the given LonWorks bus layout.
Double termination is required only when the network is a
daisy-chain configuration and the total wire length is greater
than 1640 ft (500 m). The max. lengths described in Step 2
must be adhered to for either a daisy chain or free topology
ONWORKS layout. See Fig. 19 for connection details for a
L
doubly terminated bus. See Fig. 20 for connection details for
a singly terminated bus.
Two different L
ONWORKS termination module, order no.: 209541B
• L
ONWORKS connection / termination module (mountable
• L
on DIN rails and in fuse boxes), order no.: XAL-Term
removable screw-type
3-pole terminal block
ONWORKS termination modules are available:
l
l
we
y
e
n
o
H
m
r
e
T
-
L
A
X
4
3
L
L
O
O
N
N
shield shield
plug-in
jumper
34
15
06
LON
Term in at io n
FTT/LPT Bus
FTT/LPT Free
Park Position
NOTE: The Q7750A Zone Manager has an internal ter-
mination circuit, although jumpers are required at
the terminal block to connect it. See form number
95-7509 for details.
Fig. 19. Termination Module connections for a doubly-
terminated FTT network
Fig. 20. Termination Module connections for a singly-
terminated FTT network
Fig. 18. LONWORKS connection and termination module
25 EN0B-0377GE51 R0703
EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING
Step 5. Order Equipment
After compiling a bill of materials through completion of the previous application steps, refer to Table 15 for ordering
information. Contact Honeywell for information about controllers and Excel 10 wall modules with no logo.
Table 15. Excel 10 FCU Controller ordering information
Part Number Product Description Comments
Excel 10 FCU Controllers
W7752D2007
W7752E2004
W7752F2002
W7752G2000
W7752J2003
230 Vac, FTT L
reheat
230 Vac, FTT L
reheat
115 Vac, FTT L
reheat
115 Vac, FTT L
reheat
100 Vac, FTT L
reheat
W7754K1001 230 Vac
W7754L1009 24 Vac
W7754M1007 230 Vac
W7754N1004 230 Vac
W7754P1000 230 Vac
T7460
T7560
C7068A1007 (Europe) Air Temperature Sensor Return air
Echelon-Based Components and Parts
Q7751A2002 (US)
(UK)
ONWORKS router Order from local Echelon supplier (Europe)
FTT L
(Europe)
Q7752A2001 (US)
(UK)
ONWORKS Serial Interface (SLTA) Order from local Echelon supplier (Europe)
FTT L
(Europe)
209541B FTT Termination Module Two required per LONWORKS segment.
205979A (US only) SLTA Connector Cable for LONWORKS bus Serial interface to wall module or controller.
Excel 10 Zone Manager
Q7750A2003 FTT LONWORKS Zone Manager C-Bus to LONWORKS interface
XD 505A
XD 508
—
9600 baud C-Bus Communications
Submodule
(1 Megabit baud rate) C-Bus
Communications Submodule
Serial Interface Cable, male DB-9 to female
DB-9 or female DB-25.
Honeywell (US)
AK3791 (one twisted pair)
AK3792 (two twisted pairs)
Belden (Europe)
ONWORKS (plenum): 22 AW G twisted pair
L
solid conductor, non-shielded.
9H2201504
Honeywell (US)
AK3781 (one twisted pair)
AK3782 (two twisted pairs)
Belden (Europe)
ONWORKS (non-plenum): 22 AW G twisted
L
pair solid conductor, non-shielded.
9D220150
Honeywell (US) AK3725
Honeywell (US) AK3752
(typical or equivalent)
Honeywell (US) AK3702
(typical or equivalent)
Honeywell (US) AK3712
(typical or equivalent)
Inputs: 18 AWG (1.0 mm
bundle.
Outputs/Power: 14 to 18 AWG (2.5 to
2
1.0 mm
18 AWG (1.0 mm
16 AWG (1.5 mm
ONWORKS version with
ONWORKS version without
ONWORKS version with
ONWORKS version without
ONWORKS version without
Excel 10 Wall Modules
Excel 10 Sensors
Cabling
2
) five wire cable
).
2
) twisted pair. Non-plenum
2
) twisted pair. Non-plenum
See Excel 10 wall module literature for details.
—
—
Obtain locally from any computer hardware
vendor.
Level IV 140°F (60°C) rating
Level IV 140°F (60°C) rating
Standard thermostat wire
NEC Class 2 140°F (60°C) rating
EN0B-0377GE51 R0703 26
Loading...