Mounting — Mount the enthalpy switch/receiver in a location where the outdoor air can be sampled (such as the outdoor air intake). The enthalpy switch/receiver is not a NEMA 4 enclo- sure and should be mounted in a location that is not exposed to outdoor elements such as rain or snow. Use two
Wiring — Carrier recommends the use of 18 to 22 AWG twisted pair or shielded cable for all wiring. All connections must be made with
A 24 vac transformer is required to power the enthalpy switch/receiver; as shown in Fig. 20, the PremierLink™ board provides 24 vac. Connect the GND and 24 VAC terminals on the enthalpy switch/receiver to the terminals on the transform- er. On some applications, the power from the economizer har- ness can be used to power the enthalpy switch/receiver. To power the enthalpy switch/receiver from the economizer har- ness, connect power of the enthaply switch/receiver to the red and brown wires (1 and 4) on the economizer harness.
For connection to split systems units with PremierLink con- trol, connect the LOW Enthalpy terminal on the enthalpy switch/receiver to J4 — pin 2 of the PremierLink control on the unit. The switch can be powered through the PremierLink con- trol board if desired. Wire the 24 VAC terminal on the enthalpy switch/receiver to J4 — pin 1 on the PremierLink control. Wire the GND terminal on the enthalpy switch/receiver to J1 — pin 2 on the PremierLink control. The HI Enthalpy terminal is not used. See Fig. 20.
Differential Enthalpy Control Installation (Fig. 21) — Dif- ferential enthalpy control requires both an enthalpy switch/ receiver (33CSENTHSW) and an enthalpy sensor (33CSENTSEN). The enthalpy switch/receiver is mounted in the outdoor air inlet and calculates outdoor air enthalpy. The enthalpy sensor is mounted in the return airstream and calcu- lates the enthalpy of the indoor air.
The enthalpy switch/receiver energizes the HI Enthalpy re- lay output when the outdoor enthalpy is greater than the indoor enthalpy. The LOW Enthalpy terminal is energized when the outdoor enthalpy is lower than the indoor enthalpy. The relay output is wired to the unit economizer which will open or close depending on the output of the switch.
NOTE: The enthalpy calculation is done using an average alti- tude of 1000 ft above sea level.
Mounting — Mount the enthalpy switch/receiver in a location where the outdoor air can be sampled (such as the outdoor air intake). The enthalpy switch/receiver is not a NEMA 4 enclo- sure and should be mounted in a location that is not exposed to outdoor elements such as rain, snow, or direct sunlight. Use two
Mount the enthalpy sensor in a location where the indoor air can be sampled (such as the return air duct). The enthalpy sensor is not a NEMA 4 enclosure and should be mounted in a location that is not exposed to outdoor elements such as rain or snow. Use two
Wiring — Carrier recommends the use of 18 to 22 AWG twisted pair or shielded cable for all wiring. All connections must be made with
The PremierLink board provides 24 vac to power the enthalpy switch/receiver. Connect the GND and 24 VAC terminals on the enthalpy switch/receiver to the terminals on the transformer. On some applications, the power from the economizer harness can be used to power the enthalpy switch/ receiver. To power the enthalpy switch/receiver from the econ- omizer harness, connect power of the enthaply switch/receiver to the red and brown wires (1 and 4) on the economizer harness.
Fig. 18 — Enthalpy Switch/Receiver Dimensions
(33CSENTHSW)
Fig. 19 — Enthalpy Sensor Dimensions
(33CSENTSEN)
Connect the LOW Enthalpy terminal on the enthalpy switch/receiver to J4 — pin 2 of the PremierLink control on the unit. The switch can be powered through the PremierLink con- trol board if desired. Wire the 24 VAC terminal on the enthalpy switch/receiver to J4 — pin 1 on the PremierLink control. Wire the GND terminal on the enthalpy switch/receiver to J1 — pin 2 on the PremierLink control. The HI Enthalpy terminal is not used. See Fig. 20.
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