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51
Supply Air Temperature (SAT) Sensor (33ZCSENSAT) —
This sensor is supplied with the 48TC unit. This sensor is a tu-
bular probe type, approx 6-inches (152 mm) in length. It is a
nominal 10-k ohm thermistor.
The SAT is factory-wired. The SAT probe is wire-tied to the
supply-air opening (on the horizontal opening end) in its ship-
ping position. Remove the sensor for installation. Re-position
the sensor in the flange of the supply-air opening or in the
supply air duct (as required by local codes). Drill or punch a
1
/
2
-in. hole in the flange or duct. Use two field-supplied, self-
drilling screws to secure the sensor probe in a horizontal orien-
tation. See Fig. 47.
Outdoor Air Temperature (OAT) Sensor — This sensor is
factory-mounted in the EconoMi$er2 (FIOP or accessory). It is
a nominal 10k ohm thermistor attached to an eyelet mounting
ring.
EconoMi$er2 (option or accessory) — The EconoMi$er2 sys-
tem is used with the RTU Open control for outdoor air manage-
ment. The damper position is controlled directly by the RTU
Open control; the EconoMi$er2 system has no internal logic
device.
Outdoor air management functions can be enhanced with
field-installation of these accessory control devices:
• Enthalpy control (outdoor air or differential sensors)
• Space CO
2
sensor
• Outdoor air CO
2
sensor
RTU OPEN CONTROL SYSTEM FIELD CONNEC-
TIONS — Field connections for accessory sensors and input
devices are made the RTU Open, at plugs J1, J2, J4, J5, J11 and
J20. All field control wiring that connects to the RTU Open
must be routed through the raceway built into the corner post as
shown in Fig. 32.
The raceway provides the UL required clearance between
high and low-voltage wiring. Pass the control wires through the
hole provided in the corner post, then feed the wires thorough
the raceway to the RTU Open. Connect to the wires to the re-
movable Phoenix connectors and then reconnect the connec-
tors to the board.
Space Temperature (SPT) Sensors — There are two types of
SPT sensors available from Carrier, resistive input non-com-
municating (T55, T56, and T59) and Rnet communicating
(SPS, SPPL, SPP, and SPPF) sensors. Each type has a variety
of options consisting of: timed override button, set-point ad-
justment, a LCD screen, and communication tie in. Space tem-
perature can be also be written to from a building network or
zoning system. However, it is still recommended that return
air duct sensor be installed to allow stand-alone operation for
back-up. Refer to the configuration section for details on con-
troller configurations associated with space sensors.
• 33ZCT55SPT, space temperature sensor with override
button (T-55)
• 33ZCT56SPT, space temperature sensor with override
button and set-point adjustment (T-56)
• 33ZCT59SPT, space temperature sensor with LCD (liq-
uid crystal display) screen, override button, and setpoint
adjustment (T-59)
Use 20 gauge wire to connect the sensor to the controller.
The wire is suitable for distances of up to 500 ft. Use a three-
conductor shielded cable for the sensor and setpoint adjustment
connections. If the setpoint adjustment (slidebar) is not re-
quired, then an unshielded, 18 or 20 gauge, two-conductor,
twisted pair cable may be used.
Connect T- 55 —
See Fig. 43 for typical T-55 internal connec-
tions. Connect the T-55 SEN terminals to RTU Open J20-1 and
J20-2. See Fig. 67.
Fig. 67 — RTU Open T-55 Sensor Connections
Connect T- 56 —
See Fig. 45 for T-56 internal connections.
Install a jumper between SEN and SET terminals as illustrated.
Connect T-56 terminals to RTU Open J20-1, J20-2 and J20-3
Fig. 68 — RTU Open T-56 Sensor Connections
Connect T-59 —
The T-59 space sensor requires a sep-
arate, isolated power supply of 24 VAC. See Fig. 69 for internal
connections at the T-59. Connect the SEN terminal (BLU) to
RTU Open J20-1. Connect the COM terminal (BRN) to J20-2.
Connect the SET terminal (STO or BLK) to J20-3.
Fig. 69 — Space Temperature Sensor Typical
Wiring (33ZCT59SPT)
Indoor Air Quality (CO
2
) Sensor — The indoor air quality
sensor accessory monitors space carbon dioxide (CO
2
) levels.
This information is used to monitor IAQ levels. Several types
of sensors are available, for wall mounting in the space or in re-
turn duct, with and without LCD display, and in combination
with space temperature sensors. Sensors use infrared technolo-
gy to measure the levels of CO
2
present in the space air.
The CO
2
sensors are all factory set for a range of 0 to 2000
ppm and a linear mA output of 4 to 20. Refer to the instructions
supplied with the CO
2
sensor for electrical requirements and
terminal locations. See Fig. 53 for typical CO
2
sensor wiring
schematic.
S
EN
S
EN
J20-1
J20-2
S
EN
J20-1
J20-2
S
EN
S
ET
J
u
mper
J20-
3
S
ET
OR
SET
SEN
OPB
COM- PWR+
BLU (SPT)
BLK (STO)
24 VAC
SENSOR
WIRING
POWER
WIRING
BRN (COM)
NOTE: Must use a separate isolated transformer.
J20-3
J20-2
J20-1
Summary of Contents for WeatherMaker 48TC 04
Page 4: ...4 Fig 2 Unit Dimensional Drawing ...
Page 5: ...5 Fig 2 Unit Dimensional Drawing cont ...
Page 21: ...21 Fig 34 48TC B07 Unit with Humidi MiZer Adaptive Dehumidification System Humidistat Wiring ...
Page 39: ...39 Fig 45 PremierLink Wiring Schematic ...
Page 40: ...40 Fig 46 PremierLink Wiring Schematic with Humidi MiZer System ...
Page 48: ...48 Fig 65 Typical RTU Open System Control Wiring Diagram ...
Page 49: ...49 Fig 66 Typical RTU Open System Control Wiring Diagram with Humidi MiZer System ...