Carrier CRECOMZR077A00 Installation Instructions Manual

Also see for CRECOMZR077A00: Installation instructions

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14Installing Optional HH57AC081 Single OutsideAir Enthalpy SensorWhen using the HH57AC081 (Honeywell C7400S) enthalpysensor for outside air changeover (see Fig. 32), the existingHH79ZZ007 dry bulb sensor must be removed. The enthalpysensor will be mounted in the same location as the dry bulbsensor (see Fig. 1). When the enthalpy sensor’s OA tempera-ture, enthalpy and dew point are below the respective setpoints, the outside air can be used for free-cooling. When anyof these is above the set point, free-cooling will not be avail-able. Figure 31 shows the enthalpy boundaries in the W7220Jade controller. There are (5) enthalpy boundaries (set pointsES1 through ES5), which are defined by dry bulb temperature,enthalpy, and dew point. ES3 is the default setting. Table 7shows the High Limit Curves for each setting.NOTE: To use the HH57AC081 sensor for outside air sensor, thedipswitches on the sensor must be set to OFF-OFF-OFF. SeeTable 8.The (2) gray wires with a plug from the EconoMi$er X harnessin the return chamber plug directly into the HH57AC081 en-thalpy sensor. See Fig. 25 and 30 for wiring.Fig. 31 — Enthalpy Curve BoundariesFig. 32 — HH57AC081 Sensor, Dimensions and DIPSwitch LocationLEGENDTable 7 — Single Enthalpy and Dual Enthalpy High Limit CurvesENTHALPYCURVETEMP.DRY BULB (°F)TEMP.DEW POINT (°F)ENTHALPY(BTU/LB/DA)POINT P1 POINT P2TEMP (°F) HUMIDITY %RH TEMP (°F) HUMIDITY %RHES1 80.0 60.0 28.0 80.0 36.8 66.3 80.1ES2 75.0 57.0 26.0 75.0 39.6 63.3 80.0ES3 70.0 54.0 24.0 70.0 42.3 59.7 81.4ES4 65.0 51.0 22.0 65.0 44.8 55.7 84.2ES5 60.0 48.0 20.0 60.0 46.9 51.3 88.5HL 86.0 66.0 32.4 86.0 38.9 72.4 80.341/4 (108)23/4 (70)51/64 (21)21/64 (55)Table 8 — HH57AC081 Sensor DIP SwitchUSE DIP SWITCH POSITIONS FOR SWITCHES 1,2, & 31 2 3DA OFF ON OFFRA ON OFF OFFOA OFF OFF OFFDA — Discharge Air or Supply SensorRA — Return AirOA — Outside Air