4-Pipe Sequence Of Operation - KMC Controls KMCConquest FlexStat BAC-19 Series Sequence Of Operation

SEQUENCE OF OPERATION:
1. Occupancy: The occupancy mode follows the internal schedule. If
motion (optional) is not sensed within the standby timer during
occupied mode, the unit goes into standby mode until motion is
sensed again.
3 Speed fan: When the fan mode is set to Auto and either valve is
2.
called for, the fan starts on low speed. As the space temperature
deviates further from setpoint, the fan speed changes to medium. As
the space temperature passes the active setpoint plus/minus its span,
high fan speed becomes the active speed. As the space temperature
begins to return to setpoint, the active fan speed drops to medium.
As the space temp further returns to setpoint, the fan speed switches
to low. As the active valve closes, all fan speeds are deenergized.
During the occupied and standby modes, low fan speed is energized
while both valves are closed if the fan mode is set to On. The fan
follows the normal sequence above once either valve opens.
Modulating fan: When the fan mode is set to Auto and either valve
3.
opens, the fan starts at minimum fan speed. Once the active valve is
fully open, as the space temperature deviates further from setpoint,
the fan speed increases until it reaches maximum fan speed. As the
space temperature begins to return to setpoint, the fan speed
modulates toward minimum fan speed.
speed until the space temp further returns to setpoint and the active
valve closes. During the occupied and standby modes, the fan is
energized at minimum fan speed while both valves are closed if the
fan mode is set to On. The fan follows the normal sequence above
once either valve opens.
HTG VLV
100
20
0
HTG SPAN
-2F
HTG VLV
100
0
HTG SPAN
-2F
HTG VLV
100
20
0
HTG SPAN
-2F
© 2020 KMC CONTROLS, INC.
BAC-19xxxx FlexStat Sequence of Operation and Wiring Guide
4-Pipe Fan Coil Unit with Modulating and 3-Speed Fan,
Modulating and On/Off Valves and Humidity,
Motion and CO2 Sensors
Model: BAC-19xx63C(E)
The fan runs at minimum
DEHUMIDIFICATION OPERATION
CLG VLV
100
0
ROOM TEMP DEHUM DIFF ROOM HUM
INCREASE INCREASE
CLG -5% DEHUM
SP SP
ON/OFF VALVE OPERATION
CLG VLV
CLG SPAN ROOM
TEMP
HTG CLG +2F
INCREASE
SP SP
MODULATING VALVE OPERATION
CLG VLV
ROOM
CLG SPAN
TEMP
HTG CLG +2F
INCREASE
SP SP
19476 INDUSTRIAL DR.
DRAWING TITLE:
NEW PARIS, IN 46553
CREATION DATE:
PHONE: 574.831.5250
FAX: 574.831.5252
REVISION DATE:
4. When the fan starts at any speed, if the normally closed fan status
switch (optional) doesn't open within 10 seconds, all heating and
cooling outputs are deenergized.
and heating/cooling outputs remain disabled until the fan status switch
opens.
5. On/off valves: On a call for heating or cooling , the appropriate valve
opens once the space temperature is more than half the span away
from the setpoint. When the space temperature is within 5% of the
span of setpoint, the opened valve closes.
6. Modulating valves: As space temperature deviates from setpoint, the
appropriate heating or cooling valve modulates open until it is 100%
open when the space temp is 50% of the span away from setpoint.
As the temperature drops within 50% of the span of setpoint, the
heating or cooling valve modulates to closed.
7. If the space humidity (optional) rises above the dehumidification
setpoint, the cooling valve is opened 100%. The heating valve then
follows its normal operation to maintain the COOLING setpoint. Once
the space humidity drops below the dehumidification setpoint minus
its span, dehumidification ceases and the heating and cooling valves
resume normal operation.
MAX FAN SPD
100
AUTO
0
HTG SPAN
-2F
HIGH
MED
LOW
AUTO
OFF
HTG SPAN
-2F
11
1/2/2020 FILENAME: KF1940A-2
1/31/2020 REVISION: INITIAL RELEASE
The fan output remains enabled
MOD FAN OPERATION
MIN
FAN
SPD
AUTO
ON
CLG SPAN ROOM
TEMP
HTG CLG +2F
INCREASE
SP SP
3 SPEED FAN OPERATION
AUTO
ON
ROOM
CLG SPAN
TEMP
HTG CLG +2F
INCREASE
SP SP
AG200123C