16
Wiring the Space Temperature Sensor (33ZCT58SPT) — The
T58 space temperature sensor is wired differently than other
conventional sensors. The T58 sends all its sensor information
through the CCN bus to the zone controller that it is associated
with. The SPT sensor wiring connections are not used. The T58
sensor does not need to be directly wired to the zone controller.
The T58 sensor may be powered by a separate 24-VAC pow-
er supply or may be connected to the J1 24 VAC power termi-
nals on the zone controller. Be sure that the polarity of the power
supply connections are consistent. For multiple devices wired to
the same power supply, all positive (+) and negative (–) termi-
nals should be wired in the same polarity.
Wire the T58 sensor to the CCN. Connect the CCN + termi-
nal to the RED signal wire (CCN+). Connect the CCN – termi-
nal to the BLACK signal wire (CCN–). Connect the GND
terminal to the WHITE/CLEAR signal wire (Ground). Refer to
the T58 sensor Installation Instructions for more information
on installing and wiring the sensor.
SUPPLY AIR TEMPERATURE
(SAT) SENSOR INSTAL-
LATION — On fan coil units with heating or cooling, the SAT
sensor is required. The SAT must be installed in the fan coil air
outlet. The part number is 33ZCSENSAT.
The SAT sensor probe is 6 inches in length. The probe tip
must not touch the fan coil. See Fig. 20.
For fan coil installations utilizing a supply-air grille the sup-
ply air temperature sensor should be fastened to the supply-air
grille in a location which will provide the best sensing of the
supply-air temperature during heating and cooling.
For fan coils using a ducted supply, the supply air tempera-
ture sensor should be located in the supply duct downstream of
the discharge of the fan coil to allow good mixing of the supply
airstream.
See Fig. 21 for mounting location.
Do not run sensor or relay wires in the same conduit or race-
way with Class 1 AC service wiring. Do not abrade, cut, or
nick the outer jacket of the cable. Do not pull or draw cable
with a force that may harm the physical or electrical properties.
Avoid splices in any control wiring.
Perform the following steps to connect the SAT sensor to
the fan coil controller:
1. Locate the opening in the control box. Pass the sensor
probe through the hole.
2. Drill or punch a
1
/
2
-in. hole in the fan coil unit. See
Fig. 22.
3. Use two field-supplied, self-drilling screws to secure
the sensor probe to the fan coil unit.
4. Connect the sensor leads to the fan coil controller’s
wiring harness terminal board at the terminals labeled
SAT (RED) and GND (BLK).
IMPORTANT: The T58 sensor must be configured with
the bus address and device type of the zone controller
before it will broadcast temperature to the zone control-
ler. Refer to the T58 sensor Installation Instructions for
more information on configuring the sensor.
Disconnect electrical power before wiring the fan coil con-
troller. Electrical shock, personal injury, or damage to the
fan coil controller can result.
3-CONDUCTOR
SHIELDED CABLE
3-CONDUCTOR
SHIELDED CABLE
WHITE (SPEED)
Fig. 18 — Fan Coil Thermostat Wiring (33ZCT57SPT)
LEGEND
NOTE: Do not connect white wire to SET
terminal if set point adjustment is not
needed.
CCN
—
Carrier Comfort Network
SW1
—
Switch
Set Point —
Set Point Adjust
→
1001
