BACNET® FIXED FUNCTION THERMOSTAT
31-00099—01
6
APPLICATION 2 – HEAT PUMP (AIR TO AIR)
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.
• Standby mode enables power saving if no motion is
detected while in occupancy.
• If condensation is detected, the compressor is held off
with the optional condensate input.
• By default the economizer control is set for analog. To
use three point floating control set a value in AV-63
(Economizer Stroke Time).
• The economizer control requires a supply air sensor
connected to AI-2:.
• Two stages of auxiliary heating.
• Use 10K Type II Thermistor sensors for analog inputs.
• First stage of electric heat is enabled when heating
demand is > 65%.
• Second stage of electric heat is enabled when heating
demand is > 75%.
• To configure AI-0 as a sensor set the following
parameters.
TWO STAGES ELECTRIC HEAT
Inputs
AI-0:: Space Sensor or Outside Air
Sensor (optional)
AI-2:: Supply Air Sensor (optional,
required for economizer control)
BI-1:: PIR/Door/Window Sensor
(optional)
BI-2:: Condensate Sensor (optional)
Outputs
BO-0:: Fan
BO-1:: Heat Pump Compressor
BO-2:: Reversing Valve
BO-3:: Electric Heat Stage 1
BO-4:: Electric Heat Stage 2
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
Compr.
Rev.
Valve
Digital
Digital
Digital
Supply
Fan
Electric
Heater
Digital
Digital
Electric
Heater
Digital
Space or Outside
Temperature Sensor
(optional)
Supply
Temperature Sensor
(required for economizer
control)
PIR/Door/Window Sensor
(optional)
Condensate Sensor
(optional)
BV-47 (PS)
BV-32 (Sr)
Space Temperature
Off
On
Outside Temperature
On
Off
Fan
HP Cmpr
Rev Vlv
Htg Stg 1
Htg Stg 2
Econ
Controller Terminations
HPH2 AP 2
GND
5
BO 0
BO 1
BO 2
BO 3
BO 4
BO 5
G
Y1
O/B
W1
W2
EC
0-10Vdc
4-20ma
AO 0
C
RC
24VAC
1
24V
Com
EC
AO 1
Com
14
BI/AI 1
COM
BI/AI 2
COM
BI/AI 0
Sensor *
SA Sensor
Optional
Standby
N.C. or N.O.
Optional
Condensate
alarm or fail
VC
VFD /SCR
4-20ma
* Optional space or outside temperature sensor.
