Carrier ZS Standard - Enthalpy Switch;Sensor Specifications; Wiring Specifications; Mounting Location

Enthalpy switch/receiver and Enthalpy sensor
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Enthalpy switch/sensor specifications
The following specifications are the same for the switch/receiver and sensor unless noted.
Supply voltage
Switch/Receiver:
Sensor:
24 Vac ±15%
24 to 36 Vdc
Operating range
-40° to 140°F (-40° to 60°C)
Operating relative humidity
0 to 100%, non-condensing
Output
Switch/Receiver:
Sensor:
Sourced 24 Vac through 10 Amp Form 1C relay
2-wire, 4–20 mA loop powered
Enthalpy range
Sensor only
0–50 Btu/lb
Enthalpy accuracy
±1 Btu/lb at 77°F (25°C)
Temperature accuracy
±0.36°F (0.2°C) from 32 to 158°F (0 to 70°C)
Relative humidity accuracy
±35 at 77°F (25°C)
Sensitivity
0.1% RH
Repeatability
0.5% RH
Hysteresis
< 0.4% RH
Stability
< 2% drift over 5 years
Wiring specifications
Cable from sensor to controller:
If <100 ft (30.5 meters) 22 AWG, unshielded
If >100 ft (30.5 meters) 22 AWG, shielded
Maximum length:
500 feet (152 meters)
Mounting location
Mount the enthalpy switch/receiver in the outdoor air intake.
Mount the enthalpy sensor in the return air duct.
Do not mount the enthalpy switch/receivers and sensors where they could be exposed to outdoor elements such
as rain or snow. These units are not NEMA 4 enclosures.
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