User Guide

BACnet Int egration Guide – DOAS_08.000 Rev 2 Page | 4
Object Variable Description Active Text Inactive Text
Controller Pr ovided Sequences – Unoccupied M ode
When the unoccupied mode of operation is set to night set back temperature, normal operat ion with unoccupied set point s, or recirculation with
unoccupied setpoints, the follow ing setpoints control unoccupied heat ing and cooling operation. If night set back is select ed as the Unoccupied M ode
of operat ion, the reset mode will not be available to change at t he cont roller and should be set to Space Reset(2).
IV-2 Temperature_Reset_M ode_Unoccupied
Commands the reset mode during occupied
operat ion.
1 = No Reset, 2 = Space Reset
3 = Return Reset, 4 = Outside Reset
AV-3 Temperat ure_Setpoint _Unoccupi ed
Set s the temperature setpoint based on m ode
of operat ion (space set point, ret urn setpoint or
supply setpoint ).
Not applicable for outside reset.
Real, Default = 70°F
* M in = 50°F; Max = 100°F
AV-4 Temperat ure_Heat _Cool_Deadband_Unoccupied
Heat/ Cool Setpt Deadband w hen Space or
Ret urn reset cont rol is active.
Unooc Clg Set pt = Temp Set pt Unocc +
(Deadband Unocc)/ 2
Unocc Ht g Set pt = Temp Set pt Unocc +
(Deadband Unocc)/ 2
Real, Default = 20°F
* M in = 0.5°F; M ax = 40°F
[Space/ Ret urn Heating = 60°F,
Space/ Ret urn Cooling = 80°F]
BM S Cont r olled Sequences
BM S cont rol over reset writ e to t emp set point and have mode in No reset.
* Typical range for st andard configuration unit, please verify at point min and max propert ies.
DEHUM IDIFICATION OPERATION SETPOINTS
Object Variable Description Active Text Inactive Text
Dehumidification Setpoints
The unit cont roller will ent er occupied dehumidification mode when the dehumidification trigger(s) is met . During dehumidification mode, the cooling
system is cont rolled to maint ain the cooling coil leaving air temperat ure set point while the hot gas reheat syst em (if inst alled) reheats t he air to
maintain the active supply air t emperat ure setpoint . For units wit h space or return humidity sensors, t he contr oller may also actively reset the cooling
coil temperature setpoint bet ween minim um and maximum values to mai nt ain the target space/ ret urn dehumidificat ion set point (% RH).
Note: By default , unoccupi ed dehumidification mode is not active unless a t rigger to ent er the mode is selected at t he unit cont roller since most
spaces do not have an unoccupied dehumidification load.
AV-5 Cooling_Coil_Setpoint _M in Primary Cooling Coil Leaving Air Set point
Default = 50°F
* M in = 46°F; Max = 80°F
AV-6 Cooling_Coil_Setpoint _M ax
M aximum Coil Leaving Setpoint if cooling coil
rest strategy is used.
Default = 55°F
* M in = 46°F; Max = 80°F
AV-7 Dehumidification_Set point
Dehumidification Setpoint . %RH for Space or
Ret urn cont rol
Default = 55% RH
M in = 0%; M ax = 100%
AV-11 Unoccupied_Dehumidification_Setpoint Unoccupied Dehumidification %RH Set point
Default =60% RH
M in = 0%; M ax = 100%
* Typical range for st andard configuration unit, please verify at point min and max propert ies.
AIRFLOW OPERATION SETPOINTS
Object Variable Description Active Text Inactive Text
Airflow Setpoints
Air flow operation of supply fan, exhaust fan, and mixing dampers may use setpoints from duct pressure, space pressure, CO2 sensors, or airflow
measuring stations t o properly control airflow in an application. The Outside Air Damper Minimum Set point Occupied applies t o all units wit h
modulating outside air dampers. The setpoint is used t o establish an absolut e minimum position for vent ilat ing the space w hile allow ing ot her contr ol
modes to open the damper further as necessary. Outdoor and recirculat ing air dampers operat e inversely using the same signal.
AV-14 Supply_Fan_CFM _Setpoint Supply Fan CFM Setpoint
Default = Job Specified CFM
M in = 0 cfm; M ax = 999,999 cfm
AV-15 Exhaust_Fan_CFM _Set point Exhaust Fan CFM Set point
Default = Job Specified CFM
M in = 0 cfm; M ax = 999,999 cfm
AV-16 OAD_CFM _Setpoint OAD CFM Setpoint
Default = Job Specified CFM
M in = 0 cfm; M ax = 999,999 cfm
AV-21 Ret urn_Duct _St atic_Pressure_Setpoint Ret urn Duct Stat ic Pressure Set point
Default = -2.0” w c
M in = 0.0” w c; M ax = -5.0” wc
AV-22 Space_St at ic_Pressure_Setpoint Space Static Pressure Setpoint
Default = 0.05” w c
M in = -0.5” wc; M ax = 0.5” w c
AV-23 Supply_Duct _Static_Pressure_Setpoint Supply Duct Stat ic Pressure Setpoint
Default = 1.0” wc
M in = 0.0” w c; M ax = 5.0” w c
AV-24 Space_CO2_Set point Space CO2 Setpoint
Default = 1,000 ppm
M in = 0 ppm; Max = 5,000 ppm
AV-25 Out side_Air_Damper_M inimum_Setpoint _Occ Out side Air Damper M inim um Set point Occupied
Default = 35%
M in = 0%; M ax = 100%