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SCXF-SVX01Q-EN
through the scheduled Unoccupied time setting. When
the sensor switches to Night Setback, the outdoor
dampers close and heating/cooling functions are
enabled/disabled based on set up parameters. As
building load changes, If heating/cooling functions are
enabled, the Sensor energizes self-contained unit and
evaporator fan operation. The unit will cycle heating/
cooling operation throughout the Unoccupied period
as required to maintain Unoccupied space temperature
setpoints. When the Unoccupied time period has
expired, all heating/cooling functions return to normal
operation.
When Night Setback options are used with VAV
heating/cooling, maintain airflow through the self-
contained unit by electronically tying the VAV terminals
to the unoccupied output relay contacts on the self-
contained units low voltage terminal board, or by using
changeover thermostats. Either of these methods will
assure adequate airflow through the unit and
satisfactory temperature control of the space.
N
No
otte
e:: Refer to BAS-SVX17*-EN for complete
Installation, Operation, and Maintenance
Instructions.
Time Clock Option
Grasslin Time Clock Option
The time clock option has a programmable timer that is
factory wired to the unoccupied input to provide on/off
control. The time clock will not allow the unit to pass
through the night setback/morning warm-up mode,
except on units with optional night heat/morning
warm-up, or programmable night setback.
The time clock, a “Digi 20” by Grasslin, is inside the
control panel, but accessible with the control panel
door closed. This same type timer is also used for
programmable night setback/morning warm up.
Programming instructions for the “Digi 20” timer are in
the “Programming” section.
Installing the Time Clock
1. Ensure operating temperature is between 4°F and
131°F.
2. Locate the time clock at least 5 feet away from any
large electrical contact or machinery to avoid
possible electrical interference problems.
3. Provide a separate independent circuit for the time
clock power supply.
4. Since all electronic instruments are sensitive to
voltage spikes, pay close attention to the following:
a. If possible, supply power to the electronic time
clock from a phase different than the one
supplying power to the load.
b. Provide a suitable Varistor or RC network across
the INDUCTIVE LOADS supply terminals to
reduce voltage spikes.
c. Place a diode across the DC OPERATED
INDUCTOR terminals to eliminate back EMF.
d. HIGHLY INDUCTIVE LOADS, especially
fluorescent lights, may require a relay in which
case, then Step a and Step c apply.
The time clock can be surface or flush mounted. Lift off
the front cover and loosen the two screws on opposite
corners. Pull off the base’s plug with a left to right
rolling motion.
Surface Mounting Inside Panel
1. Place screws through the base’s preset holes and
screw to back of panel or wall.
2. Wire according to the instructions in the following
section. Depending upon the specific installation,
you may find it more convenient to complete wiring
before attaching the base.
3. Place the terminal cover over the terminal block by
aligning the two screws with the corner holes in the
base.
4. Push the timer firmly onto the plug in the base.
5. Tighten the two screws. A base for DIN rail
mounting is optional.
Wiring the Time Clock
1. Wire 24, 120, or 220 VAC to input terminals. Make
sure to apply correct voltage. Using incorrect
voltage will void the warranty.
2. Connect wire to the screw terminals according to
the unit wiring diagrams. Use 12 to 22 AWG wire.
Remote Human Interface Panel
Installation
Human Interface (HI) Panel
The HI enables the user to communicate necessary unit
operating parameters and receive operating status
information from within the occupied space.
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