Installation
I/O Wiring & Sequence
MSV127 – HP DEH
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
On a call for dehumidification: Active in any control mode. If the room humidity rises above the
dehumidification setpoint, the dehumidification command will be sent to Hpump unit. If the room
humidity drops below the dehumidification setpoint, the dehumidification command will be
cancelled
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
• Fan needs to be on
• Call For Cooling or Heating at
le
ast 180 seconds
• There is a 60 seconds between
each
stages
Minimum value
CLG_Dem (AV.7)
1 stage ON
OFF
2 Heatpump stages
Heating and cooling mode
2 stage ON
10
25
30
45
OFF
Dehum On/Off
BO_DEHUM (MSV.68) = BO5
RoomRHSP
(AV.52) - 1%
RoomRHSP
(AV.52)
ON
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