Installation
I/O Wiring & Sequence
MSV127 – RT IAQ
Sequence of operation
Occupied Mode: Setpoints will revert to those defined by occupied cooling and heating setpoints
Occupied Override Mode: The system will revert to occupied mode for the duration determined by the
“OvrTime_Set AV27” parameter
On a call for cooling / System mode is Cooling or Auto and OAT>than the economizer changeover value:
Cooling stages will be energized according to cooling demand AV7 as per % threshold values to maintain
room temperature. Heating outputs are not energized.
On a call for cooling / System mode is Cooling or Auto and OAT<than the economizer changeover value:
Cooling stages will be not be energized. Cooling will be provided by modulating the economizer from it’s
minimum position according to cooling demand AV7. The supply temperature will be modulated between
the economizer center setpoint AV57 and the low limit setpoint AV58.
On a call for heating / System mode is Heating or Auto: Heating stages will be energized according to
cooling demand AV7 as per % threshold values to maintain room temperature. Cooling outputs are not
energized.
On a call for IAQ control due to CO2 levels: The system needs to be in occupied mode. The fresh air
economizer will open based on CO2 levels from the economizer minimum position to its max CO2 position
level as per settings. The free colling demand can by-pass the current economizer damper position and
open it past its current IAQ demand position based on the free cooling demand.
Fan operation: Occupied mode the fan will follow the fan mode setting (MSV4 Fan Mode). Fan On will
make the fan run continuously during occupied hours and auto in unoccupied mode. Fan Auto will only
energize the fan on a call for a heating or cooling stage to be energized.
Minimum value
HTG_Dem (AV.6) & CLG_Dem (AV.7)
1 stage ON
OFF
2 stages
2 stage ON
10
25
30
45
• Fan needs to be on
• Call For Cooling or
Heati
ng at least 180
seconds
• There is a 60 seconds
between ea
ch stages
• Economizer OAT Changeover is set at:
AV29 OA
T, Property ID 516, Index 2
• Free cooling authorized status on BV8
• Call For Cooling at least 180 seconds
CLG_Dem (AV.7)
100%
MinPos MSV30
Property ID 516 Index 1
Free cooling
AV.57
SAT_CTR_Set
Ex.: 70F
AV.58
SAT_LL_Set
Ex.: 55F
Economizer
CO2position
RoomCO2 (AI.7)
RoomCO2SP
(AV.31)
RoomCO2SP + 100
MinPos MSV30
Property ID 516 Index 1
MaxPositionCO2 MSV30
Property ID 516 Index 2
www.lynxspring.com
To Next Page
Loading...
Need help?
General
