Iseries Smart Actuator; Figure 31 Iseries Smart Actuator Electrical Terminals; Figure 32 Iseries Smart Actuator Temperature Setpoint - Bard QW2S3DA Installation Instructions Manual

iSERIES Smart Actuator

Power Up and Dehum Request
Whenever the iSeries-S is powered up, the LED turns
green and the control starts operation (see Figure
31). The power to the iSeries Smart Actuator is being
supplied through the sensor side of the R and C of the
modulating water line board. The supply sensor (SU)
and sensor common (SC) inputs are also being supplied
by the modulating water line board when the unit is
operating in dehumidification.
Based on the temperature, which is measured by the
resistance being supplied by the thermistor/sensor,
the SU and SC terminals of the modulating water line
board will send a signal to the iSeries Smart Actuator.
The iSeries Smart Actuator will then attempt to adjust
the water flow to achieve a comfortable indoor/supply
air temperature during dehumidification. NOTE: The
measurement bulb of the thermistor is located in
the blower airstream and the leads of the thermistor
are positioned on the modulating water line board
thermistor terminals.
For more information on the iSeries Smart Actuator
setpoint, see the following Setpoint section.
FIGURE 31
iSeries Smart Actuator Electrical Terminals
BOILER
POWER = GREEN
SUPPLY
SENSOR
ERROR
OUTDOOR
Manual 2100-738C
Page 42 of 73
STATUS LIGHT
C
R
24 VAC
POWER INPUT
= RED
SENSOR
COMMON
MIS-4135
Setpoint
As previously mentioned, the iSeries Smart Actuator
operates the valve to maintain a fixed setpoint. The
setpoint temperature is set using the setpoint dial
located on top of the actuator. The setpoint range
available is from 80ºF to 180ºF. The factory set
setpoint for the actuator is indicated in Figure 32.
Please adjust this setting to maintain the desired
dehumidification supply air temperature of 70ºF during
set-up.
FIGURE 32
iSeries Smart Actuator Temperature Setpoint
Sensor Warning
Do not apply power to the sensor terminals of the
iSeries Smart Actuator. If voltage is applied to these
terminals, the iSeries Smart Actuator SUPPLY,
SETBACK and/or SENSOR COMMON, the actuator will
be damaged.
Dehumidification
For sequence of operation of dehumidification, refer to
the DEHUMIDIFICATION beginning on page 43.
MIS-4135
MIS-4136 A