Carrier 48/50PG C03-14 Operation And Service Manual

Contents

76Low Voltage Terminal Strip(TB1 on PG03−16 size and TB2 on PG20−28 andPM16−28 size units)This circuit board provides a connection point between the majorcontrol boards and a majority of the field-installed accessories. (SeeFig. 43 and Table 26.)The circuit breakers for the low voltage control transformers,interface connection for the Carrier Comfort Network (CCN)communication, and interface connection for the Local EquipmentNetwork (LEN) communications are also located on the lowvoltage terminal strip.SEPARATION OF CIRCUITS TO EACH 24V TRANSFORMER MUST BE MAINTAINED1 2 3 4 5 6 7 8 9 10 R Y1 Y2 W1 W2 G C X 1 2 1 2 3 1 2FAN STATUST55J12FIRE SHUTDOWNRUN TESTJ137 8J11 71417J10LEN CCNCCN(COM) SHIELD(-)(+)48HG500382C07029Fig. 43 − Low−Voltage Terminal StripTable 26 – Field Connection Terminal StripTERMINAL LABEL DISPLAYNAME POINT DESCRIPTION SENSORLOCATION TYPE OF I/O CONNECTIONPIN NUMBER1 24 VDC Sensor Loop power 24 VDC output J10, 172 IAQ Indoor air quality sensor return/space 4-20 mA input J10, 163 Air quality & humidity sensor common Ground J10, 154 OAQ orSP.RHOutdoor air quality sensor orRelative humidity sensor field installed 4-20 mA input J10, 145 RM.OC Remote occupancy switch field installed 24 VAC input J10, 136 Switch power (ENTH, RM.OC, IAQ.S) 24 VAC output J10, 11-127 ENTH orIAQ.SOutdoor enthalpy switch, orIndoor air quality switcheconomizer, orreturn/space 24 VAC input J10, 9-108* EC.CP Economizer commanded position actuator (when in digital control) economizer 2-10 VDC output J10, 6-89 Economizer signal common Ground J10, 3-510* EC.AP Economizer position feedback (when inanalog control) economizer communication2-10 VDC output J10, 1-2R 24 VAC power 24 VAC output J11, 11-14Y1 Y1 Thermostat Y1 (1st stage cool) space 24 VAC input J11,10Y2 Y2 Thermostat Y2 (2nd stage cool) space 24 VAC input J11, 9W1 W1 Thermostat W1 (1st stage heat) space 24 VAC input J11, 7-8W2 W2 Thermostat W2 (2nd stage heat) space 24 VAC input J11, 6G G Thermostat G (Fan) space 24 VAC input J11, 5C 24 VAC common 24 VAC output J11, 2-4X ALRM Alarm output (normally open) 24 VAC output J11, 1FIRE SHUTDOWNorHUMIDISTAT 1*FDWNorHUMFire shutdown switch 24 VAC outputorHumidistat switch inputsupply/return/space switch input J12, 7FIRE SHUTDOWNorHUMIDISTAT 2*FDWNorHUMFire shutdown switch inputorHumidistat switch 24 VAC outputsupply/return/space switch input J12, 6T551-2 SPT Space temperature (T55/56) space 10k thermistor J12, 4-5T552-3SPTO orRATSpace temperature offset (T56) orReturn air temperature space or return 10k thermistor J12, 3-4FAN STATUS1-2 NOT USED J12, 1-2LEN Local Equipment Network (LEN) communication J13, 6-8, 4-5CCN Carrier Comfort Network (CCN) communication J13, 1-3, 4-5* Refer to Third Party Control section for more information48/50PG and PM