Carrier 48TM016-028 Installation, Start-up And Service Instructions Manual

Also see for 48TM016: User's information manual

Contents

21Table 8 — PremierLink™ Sensor Usage*PremierLink control requires supply air temperature sensor 33ZCSENSAT andoutdoor air temperature sensor HH79NZ039 — Included with factory-installed PremierLink control;field-supplied and field-installed with field-installed PremierLink control.NOTES:1. CO 2 Sensors (Optional):33ZCSENCO2 — Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.33ZCASPCO2 — Aspirator box used for duct-mounted CO 2 room sensor.33ZCT55CO2 — Space temperature and CO 2 room sensor with override.33ZCT56CO2 — Space temperature and CO 2 room sensor with override and setpoint.2. All units include the following standard sensors:Outdoor-air sensor — 50HJ540569 — Opens at 67 F, closes at 52 F, not adjustable.Mixed-air sensor — HH97AZ001 — (PremierLink control requires supply air temperature sensor 33ZCSENSATand outdoor air temperature sensor HH79NZ039)Compressor lockout sensor — 50HJ540570 — Opens at 35 F, closes at 50 F.ENTHALPY SWITCH/RECEIVER — The accessory en-thalpy switch/receiver (33CSENTHSW) senses temperatureand humidity of the air surrounding the device and calculatesthe enthalpy when used without an enthalpy sensor. The relay isenergized when enthalpy is high and deenergized whenenthalpy is low (based on ASHRAE [American Society ofHeating, Refrigeration and Air Conditioning Engineers] 90.1criteria). If an accessory enthalpy sensor (33CSENTSEN) isattached to the return air sensor input, then differential enthalpyis calculated. The relay is energized when the enthalpy detectedby the return air enthalpy sensor is less than the enthalpy at theenthalpy switch/receiver. The relay is deenergized when theenthalpy detected by the return air enthalpy sensor is greaterthan the enthalpy at the enthalpy switch/receiver (differentialenthalpy control). See Fig. 27 and 28.OUTDOOR ENTHALPY CONTROL (Fig. 29) — Out-door enthalpy control requires only an enthalpy switch/receiver (33CSENTHSW). The enthalpy switch/receiver ismounted in the outdoor air inlet and calculates outdoor airenthalpy. The enthalpy switch/receiver energizes the relayoutput when the outdoor enthalpy is above 28 BTU/lb OR drybulb temperature is above 75 F and is deenergized whenthe outdoor enthalpy is below 27 BTU/lb AND dry bulbtemperature is below 74.5 F. The relay output is wired to theunit economizer which will open or close depending on theoutput of the switch.NOTE: The enthalpy calculation is done using an averagealtitude of 1000 ft above sea level.Mounting — Mount the enthalpy switch/receiver in a locationwhere the outdoor air can be sampled (such as the outdoor airintake). The enthalpy switch/receiver is not a NEMA 4(National Electrical Manufacturers Association) enclosure andshould be mounted in a location that is not exposed to outdoorelements such as rain or snow. Use two field-supplied no. 8 x3/4-in. TEK screws. Insert the screws through the holes in thesides of the enthalpy switch/receiver.Wiring — Carrier recommends the use of 18 to 22 AWG(American Wire Gage) twisted pair or shielded cable for allwiring. All connections must be made with 1/4-in. female spadeconnectors.A 24-vac transformer is required to power the enthalpyswitch/receiver; as shown in Fig. 29, the PremierLink™ boardprovides 24 vac. Connect the GND and 24 VAC terminals onthe enthalpy switch/receiver to the terminals on the transform-er. On some applications, the power from the economizerharness can be used to power the enthalpy switch/receiver. Topower the enthalpy switch/receiver from the economizerharness, connect power of the enthalpy switch/receiver to thered and brown wires (1 and 4) on the economizer harness.For connection to rooftop units with PremierLink™ control,connect the LOW Enthalpy terminal on the enthalpy switch/receiver to J4 — pin 2 of the PremierLink control on theHVAC unit. The switch can be powered through the Premier-Link control board if desired. Wire the 24 VAC terminal on theenthalpy switch/receiver to J4 — pin 1 on the PremierLinkcontrol. Wire the GND terminal on the enthalpy switch/receiver to J1 — pin 2 on the PremierLink control. The HIEnthalpy terminal is not used. See Fig. 29.APPLICATION OUTDOOR AIRTEMPERATURE SENSOR RETURN AIRTEMPERATURE SENSOR OUTDOOR AIRENTHALPY SENSOR RETURN AIRENTHALPY SENSORDifferential Dry BulbTemperature withPremierLink*(PremierLinkrequires 4-20 mAActuator)Included —HH79NZ039Required —33ZCT55SPTor Equivalent — —Single Enthalpy withPremierLink*(PremierLinkrequires 4-20 mAActuator)Included —Not Used —Required —33CSENTHSW(HH57ZC003)orHH57AC077—Differential Enthalpywith PremierLink*(PremierLinkrequires 4-20 mAActuator)Included —Not Used —Required —33CSENTHSW(HH57ZC003)orHH57AC077Required —33CSENTSENorHH57AC078