BACNET® FIXED FUNCTION THERMOSTAT
21 31-00099—01
APPLICATION 17 – 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%
• 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.
• To configure AI-2 as a sensor set the following
parameters.
PIR SENSOR, ANALOG COOLING AND HEATING, THREE POINT FLOATING ECONOMIZER
Inputs
AI-2:: Space Temperature Sensor
(Optional, or could be a Supply
Air Temperature Sensor, required
for economizer control
).
BI-0:: PIR Motion Sensor (optional)
BI-1::
Door/Window Sensor (optional)
Outputs
BO-0:: Fan Low Speed
BO-1:: Fan Medium Speed
BO-2:: Fan High Speed
BO-3:: Not used
BO-4:: Economizer Open
BO-5:: Economizer Close
AO-0:: Analog Modulating Cooling
Valve 0-10V or 4-20mA
(optional)
AO-1:: Analog Modulating Heating
Valve 0-10V or 4-20mA
(optional)
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
Analog
Analog
C
M
Motion Detector PIR
(optional)
Space Temperature or Supply
Temperature Sensor
Door/Window Sensor
(optional)
BV-47 (PS) BV-32 (Sr)
Space Temperature Off On
Outside Temperature On Off
Fan F 1 SS
Fan F 2 SS
Fan F 3 SS
ECON Op
ECON Cl
Clg Vlv
Controller Terminations
4PFC AP 17
GND
5
BO 0
BO 1
BO 2
BO 3
BO 4
BO 5
AO 1
G!
G2
G3
Y1
Y2
EC
0-10Vdc
0-10Vdc
Com
14
AO 0
C
RC24VAC
1
24V
Com
BI/AI 1
COM
BI/AI 2
COM
BI/AI 0
Remote Space Sensor
EC/VC
VC
HTG VLV
4-20ma
4-20ma
Com
PIR
Motion
Sensor
Y3
W1
Optional Supply Air Sensor
Door/Window
Switch
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