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POINT NAME
Space Temp / Zone Temp
Supply Air Temperature
Outdoor Air Temperature
Space Temperature Offset Pot
Safety Chain Feedback
Compressor Safety Status
Fire Shutdown Status
Enthalpy Status
Humidistat Input Status
Indoor Air CO2
Outdoor Air CO2
Space Relative Humidity
Supply Fan Status*
Filter Status*
Door Contact Input*
Occupancy Contact*
Economizer Output
Supply Fan Relay State
Compressor 1 Relay State
Compressor 2 Relay State
Heat Stage 1 Relay State
Heat Stage 2 Relay State
Power Exhaust Relay State
Dehumidification Relay State
LEGEND
AI
---
Analog Input
AO ---
Analog Output
DI
---
Discrete Input
DO ---
Discrete Output
*
These inputs (if installed) take the place of the default input on the specific channel according to schematic.
Parallel pins J5 ---1 = J2 ---6, J5 ---3 = J1 ---10, J5 ---5 = J1 ---2 are used for field---installation.
The RTU Open controller requires the use of a Carrier
space sensor. A standard thermostat cannot be used with
the RTU Open system.
Supply Air Temperature (SAT) Sensor —
On FIOP- - equipped 48TC**16 unit, the unit is supplied with
a supply- - air temperature (SAT) sensor (33ZCSENSAT). This
sensor is a tubular probe type, approx 6- - inches (12.7 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 shipping 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
1
codes). Drill or punch a
/
2
Use two field- - supplied, self- - drilling screws to secure the
sensor probe in a horizontal orientation. See Fig. 48.
Outdoor Air Temperature (OAT) Sensor —
The OAT is factory- - mounted in the EconoMi$er2 (FIOP
or accessory). It is a nominal 10k ohm thermistor attached
to an eyelet mounting ring.
Table 8 – RTU Open Controller Inputs and Outputs
BACnet OBJECT
NAME
DEDICATED INPUTS
zone_temp
sa_temp
oa_temp
stpt_adj_offset
safety_status
comp_status
firedown_status
enthalpy_status
humstat_status
CONFIGURABLE INPUTS
iaq
oaq
space_rh
sfan_status
filter_status
door_contact_status
occ_contact_status
econ_output
sfan
comp_1
comp_2
heat_1
heat_2
pexh
dehum
- - in. hole in the flange or duct.
TYPE OF I/O
AI (10K Thermistor)
AI (10K Thermistor)
AI (10K Thermistor)
AI (100K Potentiometer)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
AI (4--- 20 ma)
AI (4--- 20 ma)
AI (4--- 20 ma)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
OUTPUTS
AO (4--- 20ma)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC, 1A)
EconoMi$er2 —
The RTU Open control is used with EconoMi$er2 (option
or accessory) for outdoor air management. The damper
position is controlled directly by the RTU Open control;
EconoMi$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
sensor
2
Outdoor air CO
2
Field Connections
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 as shown in Fig. 39. This routing
provides the UL required clearance between high- - and
low- - voltage wiring. Connect to the wires to the
removable Phoenix connectors and then reconnect the
connectors to the board.
35
CONNECTION PIN
NUMBER(S)
J20--- 1, 2
J2--- 1, 2
J2--- 3, 4
J20--- 3
J1--- 9
J1--- 2
J1--- 10
J2--- 6
J5--- 7
J4--- 2 or J4--- 5
J5--- 1 or J5--- 3 or
J5 5 or J5--- 7
J2--- 5
J1--- 4
J1--- 8
J1--- 7
J1--- 6
J1--- 5
J11--- 3
J11--- 7, 8
sensor
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