Installation
I/O Wiring & Sequence
MSV127 – RT ECON
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
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. 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 Heating at
lea
st 180 seconds
• There is a 60 seconds
between
each stages
• Economizer OAT Changeover
is s
et at: AV29 OAT, Property
ID 516, Index 2
• Free cooling authorized
sta
tus on BV8
• Call For Cooling at least 180
secon
ds
CLG_Dem (AV.7)
100%
MinP os
MSV30
Property ID 516 Index 1
Free cooling
AV.57
SAT_CTR_Set
Ex.: 70F
AV.58
SAT_LL_Set
Ex.: 55F
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