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2.4.5 - Air Inlet Baffle Board
Stage 4 provides two dry contact which control a linear
actuator motor used to operate an air inlet baffle board.
One dry contact closure is used to operate the motor
winding which extends the actuator arm outwards, and one
dry contact closure is used to operate the motor winding
which retracts the actuator arm inwards. The current rating
of these dry contacts are 6 Amps (inductive).
2.5 TEMPERATURE/STATIC PRESSURE
PROBES
Temperature and static pressure probes use a “Class 2”
low voltage circuit. These cables can extend up to a
distance of 500 feet (150 meters).
Single probe temperature and static pressure connections
are illustrated in Figure 3 while temperature probe
averaging connections are illustrated in Figure 4.
2.5.1 Single Temperature Probe
Install a single temperature probe in an area that best
reflects the overall temperature of the room. Connect the
two leads and the shield of the temperature probe to the
ECS terminals labelled “Probe” as indicated in Figure 3.
2.5.2 Temperature Averaging (optional)
Four temperature probes are required to do temperature
averaging in larger rooms. Place the probes in appropriate
locations to best average the room temperature. Refer to
Figure 4.
2.5.3 Static Pressure Probe (optional)
To properly install a SPS-1 static pressure probe refer to
its installation manual supplied with the unit.
Connect the static pressure probe to the control panel
terminals labeled SCK, PWR, and
GND as indicated in
Figure 3.
Use shielded cabling for probes . Connect the
shields to “SHLD” terminal. Failure to do so
may result in inaccurate readings!
CHAPTER 2 - INSTALLATION
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