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Table 3 – RTU--MP Controller Inputs and Outputs
POINT NAME
BACnet OBJECT
NAME
TYPE OF I/O
CONNECTION PIN
NUMBERS
INPUTS
Space Temperature Sensor sptsens AI (10K Thermistor) J20 --- 1, 2
Supply Air Temperature sat AI (10K Thermistor) J2---1, 2
Local Outside Air Temperature Sensor oatsens AI (10K Thermistor) J2---3, 4
Space Temperature Offset Pot sptopot AI (100K Potentiometer) 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 compstat DI (24 VAC) J1---2
Fire Shutdown firedown DI (24 VAC) J1 --- 10
Enthalpy Switch enthalpy DI (24 VAC) J2---6, 7
Humidistat Input Status humstat DI (24 VAC) J5---7, 8
CONFIGURABLE INPUTS*
Space Relative Humidity sprh AI (4 --- 20 m a)
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 (24 VAC)
Remote Occupancy Input remocc DI (24 VAC)
OUTPUTS
Economizer Commanded Position econocmd 4---20ma J2---5
SupplyFanRelayState sf DO Relay (24VAC , 1A) J1---4
Compressor 1 Relay State comp_1 DO Relay (24VAC , 1A) J1---8
Compressor 2 Relay State 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 Exhaust Relay State aux_2 DO Relay (24VAC , 1A) J11 --- 3
Dehumidification Relay State humizer DO Relay (24VAC, 1A) J11 --- 7, 8
LEGEND
AI --- An alog 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 = J 1 --- 2 are used for field --- installation.
The RTU--MP controller requires the use of a Byrant
space sensor. A standard thermostat cannot be used with
the RTU--MP system.
Supply Air Temperature (SAT) Sensor -- On FIOP--equipped
551J 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
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. 39.
SUPPLY AIR
RETURN AIR
SUPPLY AIR
TEMPERATURE
SENSOR
ROOF
CURB
C08200
Fig. 39 -- Typical Mounting Location for Supply Air
Temperature (SAT) Sensor on Small Rooftop Units
551J
j