Installation
I/O Wiring & Sequence
MSV127 – RT 2STG
Add 24VAC transformer when the power
is not supplied by the equipment
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: 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 heating / System mode is Heating or Auto : Heating stages will be
energized according to heating demand AV6 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 least
180 se
conds
• There is a 60 seconds delay between
eac
h stage
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