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Table 14 – RTU--MP Controller Inputs and Outputs
POINT NAME
BACnet OBJECT
NAME
TYPE OF I/O
CONNECTION PIN
NUMBE RS
INPUTS
Space Temperature Sensor sptsens AI (10K Thermistor) J20 --- 1, 2
Supply Air Temperature sat A I (10K Thermistor) J 2 --- 1, 2
Local Outside Air Temperature Sensor oatsens A I (10K Thermistor) J2 --- 3, 4
Space Temperature Offset Pot sptopot AI (100K Potentio meter) J20 --- 3
Indoor Air Quality iaq AI (4 --- 20 ma) J4 --- 2, 3
Outdoor Air Quality oaq AI (4 --- 20 ma) J4 --- 5, 6
Safety Chain Feedback safety DI (24 VAC) J1 --- 9
Compressor Safety compsta t DI (24 VAC) J1 --- 2
Fire Shutdown firedown DI (24 VAC) J1 --- 10
Enthalpy Switch enthalpy DI (24 V AC) J2 --- 6, 7
Humidistat Input Status humstat DI (24 VAC) J5 --- 7, 8
CONF IGURABLE INPUTS*
Space Relative Humidity sprh AI (4 --- 20 ma)
J4---2,3 or J4---5,6
Outside Air Relative Humidity oarh AI (4 --- 20 ma)
Supply Fan Status fanstat DI (24 VAC)
J5 --- 1,2 or J5 --- 3,4 or
J5 5,6 or J5---7,8
Filter Status filtstat DI ( 2 4 VAC)
Remote Occupancy Input remocc DI ( 2 4 VAC)
OUTPUTS
Economizer Commanded P osition econocmd 4 --- 20ma J2 --- 5
SupplyFanRelayState sf DO Relay (24VAC , 1A) J1 --- 4
Compressor 1 Relay Sta te comp_1 DO Relay (24VAC , 1A) J1 --- 8
Compressor 2 Relay Sta te comp_2 DO Relay (24VAC , 1A) J1 --- 7
Heat Stage 1 Relay State heat_1 DO Relay (24VAC , 1A) J1 --- 6
Heat Stage 2 Relay State heat_2 DO Relay (24VAC , 1A) J1 --- 5
Po wer Exhau st Relay State aux_2 DO Relay (24VAC , 1A) J11 --- 3
Dehumidification Relay State humizer DO Relay (24VAC, 1A) J11 --- 7, 8
LEGEND
AI --- Analog Input
AO --- Analog Output
DI --- Discrete Input
DO --- Discrete Output
* The se inputs (if installed) take th e place of the default input on the specific channel a ccording to schematic.
Parallel pins J5 --- 1 = J2 --- 6, J5 --- 3 = J1 --- 10, J5 --- 5 = J1 --- 2 are used for field --- installation.
Refer to the input configuration and accessory sections for more detail.
The RTU--MP controller requires the use of a Bryant
space sensor. A standard thermostat cannot be used with
the RTU--MP system.
Supply Air Temperature (SAT) Sensor — On
FIOP--equipped 548J unit, the unit is supplied wit h a
supply--air temperature (SAT) sensor (33ZCSENSAT).
This sensor is a tubular probe type, approx 6--inches
(153 mm) in length. It is a nominal 10 -- k ohm thermistor.
See Table 15 for temperature--resistance characteristic.
The SAT is factory--wired. The SAT probe is wire-- tied to
the supply--air opening (on the horizontal opening e nd) 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 loca l
codes). Drill or punch a
1
/
2
--in. (12.7 mm) hole in the
flange or duct. Use two field -- supplied, self--drilling
screws to secure the sensor probe in a horizontal
orientation. See Fig. 49.
SUPPLY AIR
RETURN AIR
SUPPLY AIR
TEMPERATURE
SENSOR
ROOF
CURB
C08200
Fig. 49 -- Typical Mountin g Location for Supply Air
Temperature (SAT) Sensor on Small Rooftop Units
548J