AppStat For Fan Coil Units
3
Installation Guide
the internal pull-up resistor. An STE-6011W10
sensor is suitable for this application. Follow the
instructions supplied with the sensor for
installation.
When a remote space temperature input is
connected to the AppStat, the remote temperature is
used instead of the internal temperature sensor.
Fan status switch (optional)
Connect a Normally Closed Fan Status switch to the
Discharge Air Temperature (DAT) input and ground
(GND) terminals. The input includes the internal
pull-up resistor. A CSE-1102 differential pressure
switch is suitable for this application. Follow the
instructions supplied with the switch for
installation.
Water temperature sensor
Connect a 10kΩ, Type III thermistor temperature
probe to the water temperature (WST) input. The
input includes the internal pull-up resistor. An
STE-1455 sensor is suitable for this application.
Follow the instructions supplied with the sensor for
installation.
Note:
The water temperature sensor is a required
input sensor for 2-pipe fan coil units.
Discharge air temperature
Connect a 10kΩ, Type III thermistor temperature
probe to the discharge air temperature (DAT) input.
The input includes the internal pull-up resistor. An
STE-1405 sensor is suitable for this application.
Follow the instructions supplied with the sensor for
installation.
Connecting outputs
The AppStat outputs are model dependent and are
configured for specific applications.
No field programming or set up is required or
possible.
Depending on model and application, the
AppStat outputs are designed for either 24
volt AC or 0-10 volt DC loads.
The outputs may represent analog or digital
signals.
Caution
Improperly connecting loads or
equipment to output terminals may
damage the equipment. Connect only
as shown in the following diagrams or
application drawings.
Illustration 5—FCU output terminals
0-10VDC
0-10VDC
0-10VDC
MS/TP
+B
A
RS
WST
GND
DAT
COM
FAN-L
FAN-M
FAN-H
R
BO4
BO5
GND
AO6
AO8
AO7
24VAC
24 VAC
24VAC
24VAC
24VAC
24VAC
24VAC
Connecting power
The AppStat requires an external, 24 volt, AC power
source. Use the following guidelines when choosing
and wiring transformers.
Use only a Class-2 transformer of the
appropriate size to supply power.
KMC Controls recommends powering the
AppStat from a dedicated controls transformer.
Connect the transformer’s neutral lead to the
COM terminal.
Connect the AC phase lead to the 24VAC
terminal.
Power is applied to the controller when the
transformer is powered.
See
Installation accessories
on page 4
for a list of
transformers available from KMC Controls, Inc.
Illustration 6—Wiring for AppStat power
24 VAC
Class-2
Controls
transformer
MS/TP
+B
A
RS
WST
GND
DAT
COM
FAN-L
FAN-M
FAN-H
R
BO4
BO5
GND
AO6
AO8
AO7
24VAC
