34
Table 4 – RTU Open Controller Inputs and Outputs
POINT NAME
BACnet OBJECT
NAME
TYPE OF I/O
CONNECTION PIN
NUMBER(S)
DEDICATED INPUTS
Space Temp / Zone Temp zone_temp AI (10K Thermistor) J 2 0 --- 1 & 2
Supply Air Temperature sa_temp AI (10K Thermist or) J 2 --- 1 & 2
Outdoor Air Temperature oa_temp AI (10K Thermist or) J 2 --- 3 & 4
Space Temperature Offset Pot stpt_adj_offset AI (100K Potentiometer) J 2 0 --- 3 & 4
Safety Chain Feedback safety_status DI (24 VAC) J 1 --- 9
Compressor Safety Status comp_status DI (24 VAC) J 1 --- 2
Fire Shutdown Status firedown_status DI (24 VAC) J 1 --- 1 0
Enthalpy Status enthalpy_status DI (24 VAC) J 2 --- 6 & 7
Humidistat Input Status humstat_status DI (24 VAC) J 5 --- 7 & 8
Zone Temperature n/a n/a J13---1, 2, 3, 4
CONFIGURABLE INPUTS
Indoor Air CO2 iaq A I ( 4 --- 2 0 m a )
J 4 --- 2 & 3 o r J 4 --- 5 & 6Outdoor Air CO2 oaq A I ( 4 --- 2 0 m a )
Space Relative Humidity space_rh A I ( 4 --- 2 0 m a )
Supply Fan Status* sfan_status DI (24 VAC)
J 5 --- 1 o r J 5 --- 3 o r J 5 --- 5
Filter Status* filter_status DI (24 VAC)
Door Contact Input* door_contact_status DI (24 VAC)
Occupancy Contact* occ_contact_status DI (24 VAC)
OUTPUTS
Economizer Output econ_output A O ( 4 --- 2 0 m a ) J 2 --- 5
SupplyFanRelayState sfan DO Relay (24VAC , 1A) J 1 --- 4
Compressor 1 Relay State comp_1 DO Relay (24VAC , 1A) J 1 --- 8
Compressor 2 Relay State comp_2 DO Relay (24VAC , 1A) J 1 --- 7
Heat Stage 1 Relay State heat_1 DO Relay (24VAC , 1A) J 1 --- 6
Heat Stage 2 Relay State heat_2 DO Relay (24VAC , 1A) J 1 --- 5
Power Exhaust Relay State pexh DO Relay (24VAC , 1A) J 1 1 --- 1 & 3
Humidimizer Relay State dehum DO Relay (24VAC, 1A) J 1 1 --- 7 , 8
LEGEND
AI --- A n a l o g I n p u t
AO --- A n a l o g O u t p u t
DI --- D i s c r e t e I n p u t
DO --- Discrete Output
* These inputs (if installed) take the place of the default input on the specific channel according to schematic.
P a r a l l e l p i n s J 5 --- 1 = J 2 --- 6 , J 5 --- 3 = J 1 --- 1 0 , J 5 --- 5 = J 1 --- 2 a r e u s e d f o r f i e l d --- i n s t a l l a t i o n .
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 48LC unit, the unit is supplied with a
supply--air temperature (SAT) sensor (33ZCSENSAT).
This sensor is a tubular 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 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
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 orientation. See Fig. 53.
SUPPLY AIR
RETURN AIR
SUPPLY AIR
TEMPERATURE
SENSOR
ROOF
CURB
C08200
Fig. 53 -- Typical Mounting Location for Supply Air
Temperature (SAT) Sensor on Small Rooftop Units
48HC48LC
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