56
ECONOMI$ER2
The RTU Open controller is used with EconoMi$er2 (fac-
tory-installed option or field-installed accessory) for outdoor
air management. The damper position is controlled directly
by the RTU Open controller; EconoMi$er2 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
Field Connections
Field connections for accessory sensors and input devices
are made through the RTU Open controller, at plugs J1, J2,
J4, J5, J11 and J20. All field control wiring that connects to
the RTU Open controller must be routed as shown in Fig. 39.
The routing provides the UL required clearance between high
and low-voltage wiring. Connect to the wires to the remov-
able Phoenix connectors and then reconnect the connectors to
the board.
SPACE TEMPERATURE (SPT) SENSORS
There are two types of SPT sensors available from Carrier:
resistive input non-communicating (T-55, T-56, and T-59)
and Rnet communicating (SPS, SPPL, SPP, and SPPF) sen-
sors. Each type has a variety of options consisting of: timed
override button, set point adjustment, a LCD screen, and
communication tie-in. Space temperature can be also be writ-
ten 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 config-
uration section for details on controller configurations associ-
ated with space sensors.
Field connections to T-55, T-56 and T-59 are provided as
examples.
• 33ZCT55SPT, space temperature sensor with override
button (T-55)
• 33ZCT56SPT, space temperature sensor with override
button and setpoint 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 adjust-
ment connections. If the setpoint adjustment (slidebar) is not
required, then an unshielded, 18 or 20 gauge, two-conductor,
twisted pair cable may be used.
Connect T-55
See Fig. 63 for typical T-55 internal connections. Connect
the T-55 SEN terminals to the RTU Open controller at J20-1
and J20-2. See Fig. 82.
Fig. 82 — RTU Open Controller T-55 Sensor
Connections
Connect T-56
See Fig. 65 for T-56 internal connections. Install a jumper
between SEN and SET terminals as illustrated. Connect T-56
terminals to the RTU Open controller at J20
-
1, J20
-
2 and J20
-
3 per Fig. 83.
Fig. 83 — RTU Open Controller T-56 Sensor
Connections
Connect T-59
The T-59 space sensor requires a separate, isolated power
supply of 24 vac. See Fig. 84 for internal connections at the
T-59. Connect the SEN terminal (BLU) to the RTU Open
controller at J20
-
1. Connect the COM terminal (BRN) to J20
-
2. Connect the SET terminal (STO or BLK) to J20
-
3.
Fig. 84 — 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 return duct, with and
without LCD display, and in combination with space tem-
perature sensors. Sensors use infrared technology 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 instruc-
tions supplied with the CO
2
sensor for electrical requirements
and terminal locations. See Fig. 68 for typical CO
2
sensor
wiring schematic.
To accurately monitor the quality of the air in the condi-
tioned air space, locate the sensor near a return-air grille (if
present) so it senses the concentration of CO
2
leaving the
space. The sensor should be mounted in a location to avoid
direct breath contact.
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 WeatherMaster 50HC14
Page 4: ...4 Fig 2 Unit Dimensional Drawing 14 Size Unit ...
Page 5: ...5 Fig 2 Unit Dimensional Drawing 14 Size Unit cont HORIZONTAL ECONOMIZER VERTICAL ECONOMIZER ...
Page 8: ...8 Fig 4 Roof Curb Details ...
Page 24: ...24 Fig 46 Typical Humidi MiZer Adaptive Dehumidification System Humidistat Wiring ...
Page 39: ...39 Fig 54 50HC14 Control Box Component Locations with ComfortLink Controls ...
Page 40: ...40 Fig 55 50HC14 ComfortLink Control Wiring Diagram ...
Page 41: ...41 Fig 56 50HC14 ComfortLink Power Wiring Diagram ...
Page 42: ...42 Fig 57 50HC14 ComfortLink with Humidi MiZer Power Wiring Diagram ...
Page 44: ...44 Fig 60 PremierLink Wiring Schematic ...
Page 45: ...45 Fig 61 PremierLink Wiring Schematic with Humidi MiZer System Option ...
Page 53: ...53 Fig 80 RTU Open System Control Wiring Diagram ...
Page 54: ...54 Fig 81 RTU Open System Control Wiring Diagram with Humidi MiZer System Option ...
Page 64: ......
Page 65: ......