STRATO BW437-RTU - Page 40

Installation
I/O Wiring & Sequence
MSV127 – HP 3STG
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: Reversing valve will be set in
cooling (default O setting). HPump 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 : Reversing valve will be set in
heating / non energized (default O setting). HPump stages will be energized according
to heating demand AV6 as per % threshold values to maintain room temperature
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.
• Fan needs to be on
• Call For Cooling or Heating
at least 180 seconds
• There is a 60 seconds
between each stages
Minimum value
CLG_Dem (AV.7)
BO.2 ON
OFF
BO.3 ON
BO.4 ON
50
100
10 25 30 45 65 70 85
3 Heatpump Cooling
Minimum value
HTG_Dem (AV.6)
BO.2 ON
50
100
OFF
3 Heatpump Heating
BO.3 ON
BO.4 ON
10 25 30 45 65 70 85