BACNET® FIXED FUNCTION THERMOSTAT
31-00099—01 12
APPLICATION 8 – FAN COIL UNIT – 4 PIPE
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.
• 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.
DOOR SENSOR, LOW/MEDIUM/HIGH SPEED FAN. TWO POSITION COOLING AND HEATING
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.
MS/TP Network
Digital
2 Position Open/Close
Digital
2 Position Open/Close
C
M
Motion Detector PIR
(optional)
Supply
Temperature Sensor
(required for economizer
control)
Door/Window Sensor
(optional)
Main Door
Sensor
(optional)
Fan F 1 SS
Fan F 2 SS
Fan F 3 SS
Clg Vlv
Htg Vlv
Econ
Controller Terminations
4PFC AP 8
GND
5
BO 0
BO 1
BO 2
BO 3
BO 4
BO 5
AO 1
G1
G2
G3
Y1
W1
EC
0-10Vdc
Com
14
4-20ma
AO 0
C
RC24VAC
1
24V
Com
BI/AI 1
COM
BI/AI 2
COM
BI/AI 0
SA Sensor
Door/Window
Switch
EC/VC
VC
VFD /SCR
4-20ma
Com
PIR
Motion
Sensor
Main Door
Switch
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