29
Table 9 – 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 A I ( 4 --- 20 ma) J4---2, 3
Outdoor Air Quality oaq AI ( 4 --- 2 0 m a ) 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 --- 1 0
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 A I ( 4 --- 2 0 ma)
J4 --- 2 , 3 o r J 4 --- 5 , 6
Outside Air Relative Humidity oarh AI ( 4 --- 2 0 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
Power Exhaust 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 O utp ut
DI --- D iscrete Input
DO --- Discrete Output
* These inputs (if installed) take the place of the default input on the specific channel according to schematic.
P arall el pins J5 --- 1 = J2 --- 6, J5 --- 3 = J1 --- 10, J5 --- 5 = J1 --- 2 a re used for field --- i nstallation.
The RTU--MP controller requires the use of a Carrier
space sensor. A standard thermostat cannot be used with
the RTU--MP system.
Supply Air Temperature (SAT) Sensor -- On
FIOP--equipped 50TC unit, the unit is supplied with a
supply--air temperature (SAT) sensor (33ZCSENSAT).
This sensor is a tubular probe type, approx 152 mm
(6--inches) 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 12.7 m
(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. 28.
Outdoor Air Temperature (OAT) Sensor -- The OAT is
factory--mounted in the EconoMi$er2 (FIOP or
accessory). It is a nominal 10k ohm thermistor attached to
an eyelet mounting ring.
EconoMi$er2 -- The RTU--MP control is used with
EconoMi$er2 (option or accessory) for outdoor air
management. The damper position is controlled directly
by the RTU--MP control; EconoMi$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
2
sensor
Outdoor air CO
2
sensor
50TC
