Application 8 - Fan Coil Unit - 4 Pipe - Honeywell BACnet Quick Reference Manual

BACNET® FIXED FUNCTION THERMOSTAT
APPLICATION 8 – FAN COIL UNIT – 4 PIPE
DOOR SENSOR, LOW/MEDIUM/HIGH SPEED FAN. TWO POSITION COOLING AND HEATING
MS/TP Network
Digital
Digital
Door/Window Sensor
Motion Detector PIR
(optional)
Features and Notes
• Three modes of schedule control set by AV-123 –
0 = Single point with offset during occupancy,
1 = Dual setpoint residential – wake, leave, return & sleep,
2 = Dual setpoint with offset occupancy.
• BACnet MS/TP compliant.
• English or metric units.
• Outputs are disabled if BV-2 is off.
• Disable operator access via the display to the schedule
by setting BV-102 to off.
• Onboard schedule can be enabled or disabled (BV-40).
• Heating and cooling are disabled if the fan is off.
• Use up and down arrows on the display to force the unit
into occupancy for four hours.
• Setpoint mode emulates residential thermostat
operation.
• Fan can be set to run continuously or cycle on and off for
heating or cooling demands while in Occupancy mode
(AV-17).
• Fan speed will ramp between 0-100% depending on
cooling and heating demands
• Fan speed selected upon the following settings -
Low Speed – at 20% demand (adjustable in AV-46)
Medium Speed – at 40% demand (adjustable in AV-85)
High Speed – at 70% demand (adjustable in AV-89)
Fan speed deadband set at 2%
• Analog economizer control is defaulted to disabled.
• Economizer requires a supply air sensor connected to
AI-2.
• The cooling and heating valves can be controlled by
either a cooling and heating signal or via the supply air
temperature (BV-15).
• Humidity control can be enabled for un-occupancy
(BV-12 & BV-53).
• Use a 10K Type II Thermistor Sensor for AI-2 Input.
31-00099—01
2 Position Open/Close
2 Position Open/Close
C
M
(optional)
Supply
Temperature Sensor
Main Door
(required for economizer
Sensor
control)
(optional)
• If the BACnet FF detects that the door or window contact
is open during occupancy for a period longer than what
is defined in the standby delay (AV-20) it will put the unit
into standby mode.
Controller Terminations
1
24VAC
5
GND
BO 0
BO 1
BO 2
BO 3
BO 4
BO 5
AO 0
Com
14
AO 1
BI/AI 0
COM
BI/AI 1
COM
BI/AI 2
12
Inputs
AI-2:: Supply Air Sensor (optional,
required for Economizer control)
BI-0:: PIR Motion Sensor (optional)
BI-1:: Door/Window Sensor (optional)
BI-2:: Main Door Sensor (optional)
Outputs
BO-0:: Fan Low Speed
BO-1:: Fan Medium Speed
BO-2:: Fan High Speed
BO-3:: Cooling 2 Position Valve
BO-4:: Heating 2 Position Valve
BO-5:: Not used
AO-0:: Economizer (optional analog)
0-10V or 4-20mA
AO-1:: Fan Speed Control (optional)
4-20mA VFD/SCR
Note: Any I/O listed as "optional" will
require a BV to be set. Refer to the
sequence of operations outlined in
the BACnet FF Thermostat System
Engineering Guide, 31-00098.
4PFC AP 8
RC
C
Fan F 1 SS
G1
Fan F 2 SS
G2
Fan F 3 SS
G3
Clg Vlv
Y1
Htg Vlv
W1
0-10Vdc
24V
Econ
EC
4-20ma Com
EC/VC
VFD /SCR
Com
VC
4-20ma
SA Sensor
PIR
Motion
Sensor
Door/Window
Switch
Main Door
Switch