Installation
I/O Wiring & Sequence
MSV127 – HUM-DEH (RTU)
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 “OvrTime_Set AV27”
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
cooling demand AV7 as per % threshold values to maintain room temperature. Cooling outputs are
not energized
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 Rooftop unit. If the room
humidity drops below the dehumidification setpoint, the dehumidification command will be cancelled
On a call for humidification: The analog modulating humidifier will modulate/ [Binary on/off] to
maintain the room humidity setpoint. If a supply humidity sensor is installed, the humidifier will
throttle down [Binary on/off] to prevent the supply humidity to rise above the supply humidity high
limit setpoint
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 Heating at
least 180 seconds
• There is a 60 seconds between
each stages
OFF
Dehum On/Off
BO_DEHUM (MSV.68) = BO5
RoomRHSP
(AV.52) - 1%
RoomRHSP
(AV.52)
ON
Humidifier modulating
AO_HUM (MSV.49) = AO1
100
Minimum value
PidRoomRH (Loop.10) or PidHL_SupRH (Loop.11)
• Fan needs to be on
• Based on AV51 Eff_RH
humidity value
• Based on a modulating
0-10 VDC humidifier
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