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ENTHALPY LOGIC CENTER

Price: $415.32 
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SKU: CIB90001N
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Manufacturer: Johnson Controls

Description: ENTHALPY LOGIC CENTER
Category: Electrical Controls

N-9000 Enthalpy Logic Center

The N-9000 Enthalpy Logic Center is a pneumatic logic network designed to provide true economizer control for all air handing units capable of using outside air for free cooling. By selecting the appropriate air stream (outside or return air), the N-9000 imposes the lowest cooling load on the mechanical cooling equipment. This selection is based on enthalpy when outside air has the higher moisture content and on sensible heat when return air has the higher moisture content.

Operation
Based on the transmitter inputs, the N-9000 calculates the outside air and return air enthalpy. When outside air enthalpy is greater than return air enthalpy or when outside air temperature is greater than return air temperature, the N-9000 provides a maximum output signal of 10 PSIG (70 kPa) or greater. This signal returns the outside air damper to its minimum position (see Fig. 4). Note: If outside air temperature is greater than return air temperature, the output signal is at maximum and will not be reduced by a change in the humidity signal. When outside air enthalpy is less than return air enthalpy and outside air temperature is less than return air temperature, the N-9000 provides a 0 PSIG output signal. This signal places the dampers under control of the system controller to obtain free cooling. By enthalpy and sensible head comparison of both outside and return air conditions, the N-9000 provides the most efficient use of free cooling and thus true economizer operation.

Controls
Operation of the N-9000 requires input signals from temperature and humidity transmitters in the outside and return air streams. These transmitters are T-5210 temperature (0 to 100F) and H-5210 humidity (0 to 100% RH) with 3 to 15 PSIG (21 to 105 kPa) output pressure ranges. The Enthalpy Logic Center is furnished with internal supply air restrictors to allow the transmitters to be connected directly. An in-line filter is provided on the supply connection and must be used for protection of the internal circuitry against contamination.

Note: This in-line filter cannot be depended upon to remove all contaminants.

Mounting
The N-9000 is equipped with an integral mounting bracket and two #8 sheet metal screws for mounting on a wall, duct or control panel. Air connections can be made with 5/32 or 1/4 in. O.D. polytubing to barbed fittings on the unit. The supply air connection should be made with 1/4 in. tubing to the in-line filter furnished with the unit.

Replaces Part Numbers: N-9000-1, CARN-9000-1


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