Carrier SINGLE PACKAGE ROOFTOP 48HC Installation Instructions Manual

Also see for 48TC*D: Service and maintenance instructions Installation instructions

39Table 9 – RTU Open Controller Inputs and OutputsPOINT NAME BACnet OBJECTNAME TYPE OF I/O CONNECTION PINNUMBER(S)DEDICATED INPUTSSpace Temp / Zone Temp zone_temp AI (10K Thermistor) J20--- 1, 2Supply Air Temperature sa_temp AI (10K Thermistor) J2--- 1, 2Outdoor Air Temperature oa_temp AI (10K Thermistor) J2--- 3, 4Space Temperature Offset Pot stpt_adj_offset AI (100K Potentiometer) J20--- 3Safety Chain Feedback safety_status DI (24 VAC) J1--- 9Compressor Safety Status comp_status DI (24 VAC) J1--- 2Fire Shutdown Status firedown_status DI (24 VAC) J1--- 10Enthalpy Status enthalpy_status DI (24 VAC) J2--- 6Humidistat Input Status humstat_status DI (24 VAC) J5--- 7CONFIGURABLE INPUTSIndoor Air CO2 iaq AI (4--- 20 ma)J4--- 2 or J4--- 5Outdoor Air CO2 oaq AI (4--- 20 ma)Space Relative Humidity space_rh AI (4--- 20 ma)Supply Fan Status* sfan_status DI (24 VAC)J5--- 1 or J5--- 3 orJ5 5 or J5--- 7Filter Status* filter_status DI (24 VAC)Door Contact Input* door_contact_status DI (24 VAC)Occupancy Contact* occ_contact_status DI (24 VAC)OUTPUTSEconomizer Output econ_output AO (4--- 20ma) J2--- 5Supply Fan Relay State sfan DO Relay (24VAC , 1A) J1--- 4Compressor 1 Relay State comp_1 DO Relay (24VAC , 1A) J1--- 8Compressor 2 Relay State comp_2 DO Relay (24VAC , 1A) J1--- 7Heat Stage 1 Relay State heat_1 DO Relay (24VAC , 1A) J1--- 6Heat Stage 2 Relay State heat_2 DO Relay (24VAC , 1A) J1--- 5Power Exhaust Relay State pexh DO Relay (24VAC , 1A) J11--- 3Dehumidification Relay State dehum DO Relay (24VAC, 1A) J11--- 7, 8LEGENDAI --- Analog InputAO --- Analog OutputDI --- Discrete InputDO --- 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 Carrierspace sensor. A standard thermostat cannot be used withthe RTU Open system.Supply Air Temperature (SAT) Sensor —On FIOP--equipped 48HC unit, the unit is supplied with asupply--air temperature (SAT) sensor (33ZCSENSAT). Thissensor is a tubular probe type, approx 6--inches (12.7 mm) inlength. It is a nominal 10--k ohm thermistor.The SAT is factory--wired. The SAT probe is wire--tied to thesupply--air opening (on the horizontal opening end) in itsshipping position. Remove the sensor for installation.Re--position the sensor in the flange of the supply--airopening or in the supply air duct (as required by localcodes). Drill or punch a 1/2 --in. hole in the flange or duct.Use two field--supplied, self--drilling screws to secure thesensor probe in a horizontal orientation. See Fig. 40.Outdoor Air Temperature (OAT) Sensor —The OAT is factory--mounted in the EconoMi$er2 (FIOP oraccessory). It is a nominal 10k ohm thermistor attached toan eyelet mounting ring.EconoMi$er2 —The RTU Open control is used with EconoMi$er2 (optionor accessory) for outdoor air management. The damperposition is controlled directly by the RTU Open control;EconoMi$er2 has no internal logic device.Outdoor air management functions can be enhanced withfield--installation of these accessory control devices:Enthalpy control (outdoor air or differential sensors)Space CO2 sensorOutdoor air CO2 sensorField ConnectionsField connections for accessory sensors and input devicesare made the RTU Open, at plugs J1, J2, J4, J5, J11 andJ20. All field control wiring that connects to the RTUOpen must be routed through the raceway built into thecorner post as shown in Fig. 31. The raceway provides theUL required clearance between high-- and low--voltagewiring. Pass the control wires through the hole provided inthe corner post, then feed the wires thorough the raceway48HC