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A
B
Outside Air
Relief Air
Fig. 20 — EconomizerONE Hood Detail
8000
7000
6000
5000
4000
3000
2000
1000
0
0
0.1
0.2
0.3
RETURN DUCT STATIC PRESSURE (in.wg)
Fig. 21 — Barometric Relief Flow Capacity
Hood
Aluminum
Filter
Filter
Clip
Cleanable
Aluminum Filter
0.4
0.5
0.6
0.7
7000
6000
5000
4000
3000
2000
1000
0
0
0.05
0.1
RETURN AIR PRESSURE DROP (in.wg)
Fig. 22 — Return Air Pressure Drop
INSTALLING OPTIONAL HH57LW001 SINGLE
OUTSIDE AIR ENTHALPY SENSOR
When using the HH57LW001 enthalpy sensor (see Fig. 26) for
outside air changeover, the existing HH79NZ039 dry bulb sensor
(see Fig. 25) must be removed. The enthalpy sensor will be
mounted in the same location as the dry bulb sensor (see Fig. 1).
When the enthalpy sensor's OA (Outside Air) temperature, enthal-
py and dew point are below the respective setpoints, the outside
air can be used for free-cooling. When any of these are above the
setpoint, free-cooling will not be available. Enthalpy setpoints are
configurable and create an enthalpy boundary according to the us-
er's input. For additional details see Fig. 23-24 and Table 6.
Harness 48TC005213 is required to be connected between the
EconomizerONE harness in the return air chamber. Harness
48TC005213 has a 5 pin plug that connects directly to the
HH57LW001 enthalpy sensor.
Enthalpy Control Sensor Configuration
The optional enthalpy control sensor (Part No.: HH57LW001)
communicates with the POL 224 economizer controller using the
five-wire harness, 48TC005213. The HH57LW001 sensor can be
used as a single outside air enthalpy, a differential return enthalpy,
or a differential return temperature sensor. See Fig. 19 for wiring
the HH57LW001 enthalpy sensor for each option. Use Fig. 26 and
Table 8 on page 13 to locate the wiring terminals for each enthalpy
control sensor.
10
0.15
0.2
0.25
0.3
0.35
0.4
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