Single Outside Air Enthalpy Sensor - LG ARNU363DDA4 Installation Manual

SINGLE OUTSIDE AIR ENTHALPY SENSOR

Single Outside Air Enthalpy Sensor
When the enthalpy sensor's OA temperature, enthalpy and dew point are below the respective setpoints, the outside air can be used for free-
cooling. When any of these is above the setpoint, free-cooling will not be available. Figure 37 shows the enthalpy boundaries in the W7220
JADE controller. There are (5) enthalpy boundaries (setpoints ES1 thru ES5), which are defined by dry bulb temperature, enthalpy, and dew
point. ES3 is the default setting. Table 4 shows the High Limit Curves for each setting.
To use the (C7400S) sensor for outside air sensor, the DIP switches on the sensor must be set to OFF-OFF-OFF. See Table 5.
Figure 37: Enthalpy Curve Boundaries.
Table 4: Single Enthalpy and Dual Enthalpy High Limit Curves.
Temp� Dry
Enthalpy Curve
Bulb (°F)
ES1 80
ES2 75
ES3 70
ES4 65
ES5 60
HL 86
Figure 38: (7400S) Dimensional, Connection and Switching Information.
Temp� Dewpoint Enthalpy
(°F) (btu/lb/da)
60 28
57 26.0
54 34.0
51 22.0
48 20.0
66 32.4
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Point P1
Temp� (°F) Humidity (% RH)
80 36.8
75 39.6
70 42.3
60 46.9
60 46.9
86 38.9
Table 5: (7400S) Sensor DIP Switch Settings.
DIP Switch Positions For Switches 1, 2, and 3
Use
1
DA OFF
RA ON
OA OFF
DA – Discharge Air (Not used on economizer)
RA – Return Air
OA – Outside Air
Default Setting = OFF – OFF – OFF
Point P2
Temp� (°F) Humidity (% RH)
66.3 80.1
63.3 80.0
59.7 81.4
51.3 88.5
51.3 88.5
72.4 80.3
2 3
ON OFF
OFF OFF
OFF OFF
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