Installing Optional Hh57Ac081 Single Outside Air Enthalpy Sensor - Carrier CRECOMZR067A01 Installation Instructions Manual

Installing Optional HH57AC081 Single Outside
Air Enthalpy Sensor
When using the HH57AC081 (Honeywell C7400S) enthal-
py sensor (Fig. 30) for outside air changeover, the existing
HH79AH001 (Honeywell C7250) dry bulb sensor must be re-
moved. The enthalpy sensor will be mounted in the same loca-
tion as the dry bulb sensor; see Fig. 1. When the enthalpy sen-
sor's OA temperature, enthalpy, and dew point are below the
respective setpoints, the outside air can be used for free-cool-
ing. When any of these is above the setpoint, free-cooling will
not be available. Figure 29 shows the enthalpy boundaries in
ECONOMIZING
AVAILABLE
NOT AVAILABLE
ENTHALPY TEMP. DRY
CURVE BULB (F)
ES1 80
ES2 75
ES3 70
ES4 65
ES5 60
HL 86
4-1/4 (108)
2-3/4 (70)
HH57AC081
Temp & Humidity
NOTE: Dimensions are in. (mm).
Fig. 30 — HH57AC081 Dimensional, Connection and
Switching Information
TEMPERATURE
Fig. 29 — Enthalpy Curve Boundaries
Table 7 — Single Enthalpy and Dual Enthalpy High Limit Curves
TEMP. ENTHALPY
DEWPOINT (F) (btu/lb/da)
60
57
54
51
48
66
2-1/64 (55)
the W7220 Jade controller. There are 5 enthalpy boundaries
(setpoints ES1 through ES5), which are defined by dry bulb
temperature, enthalpy, and dew point. ES3 is the default set-
ting. Table 7 shows the High Limit Curves for each setting. Im-
portant: to use the HH57AC081 sensor for outside air sensor,
the dip switches on the sensor must be set to OFF-OFF-OFF.
See Table 8.
The 2 gray wires with a plug from the EconoMi$er X har-
ness in the return chamber plug directly into the HH57AC081
enthalpy sensor. See Fig. 23 and 28 for wiring.
POINT P1
TEMP. (F)
28.0 80
26.0 75
24.0 70
22.0 65
20.0 60
32.4 86
Table 8 — HH57AC081 Sensor Dip Switch Settings
DIP SWITCH POSITIONS FOR SWITCHES 1, 2, AND 3
USE
DA
RA
OA
LEGEND
DA — Discharge Air (not used on EconoMi$er X)
RA — Return Air
OA — Outside Air
Default Setting = OFF-OFF-OFF
13
DUAL ENTHALPY
HIGH LIMIT
SINGLE ENTHALPY
P2 (T,RH)
P1
(T,RH)
ES4 ES2 ES1
ES5 ES3 HL
HUMIDITY
TEMP. (F)
(%RH)
36.8 66.3
39.6 63.3
42.3 59.7
44.8 55.7
46.9 51.3
38.9 72.4
1 2
OFF ON
ON OFF
OFF OFF
POINT P2
HUMIDITY
(%RH)
80.1
80.0
81.4
84.2
88.5
80.3
3
OFF
OFF
OFF