![background image](http://html.mh-extra.com/html/carrier/weathermaker-48kc-series/weathermaker-48kc-series_installation-instructions-manual_2560311038.webp)
38
Table 15 — Enthalpy Operation No DCV (CO
2
Sensor) — 1 Speed Fan
*With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2-O after the delay if the call for Y1-I and
Y2-I have not been satisfied.
Table 16 — Enthalpy Operation with DCV (CO
2
Sensor) — 1 Speed Fan
*With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2-O after the delay if the call for Y1-I and
Y2-I have not been satisfied.
Table 17 — Single Enthalpy and Dual Enthalpy High Limit Curves
Enthalpy Settings
When the OA temperature, enthalpy and dew point are be-
low the respective setpoints, the Outdoor Air can be used for
economizing. Fig. 53 shows the new single enthalpy bound-
aries in the W7220. There are 5 boundaries (setpoints ES1
through ES5), which are defined by dry bulb temperature, en-
thalpy and dew point.
Refer to Table 17 for ENTH CURVE setpoint values.
The W7220 calculates the enthalpy and dew point using
the OA temperature and humidity input from the OA enthal-
py sensor. When the OA temperature, OA humidity and OA
dew point are all below the selected boundary, the economiz-
er sets the economizing mode to YES, economizing is avail-
able.
When all of the OA conditions are above the selected
boundary, the conditions are not good to economize and the
mode is set to NO.
Fig. 53 shows the 5 current boundaries. There is also a
high limit boundary for differential enthalpy. The high limit
boundary is ES1 when there are no stages of mechanical
cooling energized and HL (high limit) when a compressor
stage is energized.
DEMAND
CONTROLLED
VENTILATION (DCV)
OUTSIDE AIR
GOOD TO
ECONOMIZE
Y1-I
Y2-I
FAN
SPEED
Y1-O
Y2-O
OCCUPIED
UNOCCUPIED
NONE
NO
OFF
OFF
HIGH
0v/Off
0v/Off
MIN POS
Closed
ON
OFF
HIGH
24v/On
0v/Off
MIN POS
Closed
ON
ON
HIGH
24v/On
24v/On
MIN POS
Closed
NONE
YES
OFF
OFF
HIGH
0v/Off
0v/Off
MIN POS
Closed
ON
OFF
HIGH
0v/Off
0v/Off
MIN POS to Full
Open
Closed to Full-Open
ON
ON
HIGH
24v/On
0v/Off*
MIN POS to Full
Open
Closed to Full-Open
DEMAND
CONTROLLED
VENTILATION (DCV)
OUTSIDE AIR
GOOD TO
ECONOMIZE
Y1-I
Y2-I
FAN
SPEED
Y1-O
Y2-O
OCCUPIED
UNOCCUPIED
Below CO
2
Set
No
OFF
OFF
HIGH
0v/Off
0v/Off
VENTMIN
Closed
ON
OFF
HIGH
24v/On
0v/Off
VENTMIN
Closed
ON
ON
HIGH
24v/On
24v/On
VENTMIN
Closed
Yes
OFF
OFF
HIGH
0v/Off
0v/Off
VENTMIN
Closed
ON
OFF
HIGH
0v/Off
0v/Off
VENTMIN to
Full-Open
Closed to Full-Open
ON
ON
HIGH
24v/On
0v/Off
VENTMIN to
Full-Open
Closed to Full-Open
Above CO
2
Set
No
OFF
OFF
HIGH
0v/Off
0v/Off
VENTMIN to
VENTMAX
Closed
ON
OFF
HIGH
24v/On
0v/Off
VENTMIN to
VENTMAX
Closed
ON
ON
HIGH
24v/On
24v/On
VENTMIN to
VENTMAX
Closed
Yes
OFF
OFF
HIGH
0v/Off
0v/Off
VENTMIN to
VENTMAX
Closed
ON
OFF
HIGH
0v/Off
0v/Off
VENTMIN to
Full-Open
Closed to Full-Open
ON
ON
HIGH
24v/On
0v/Off*
VENTMIN to
Full-Open
Closed to Full-Open
ENTHALPY
CURVE
TEMP. DRY
BULB (F)
TEMP.
DEWPOINT (F)
ENTHALPY
(btu/lb/da)
POINT P1
POINT P2
TEMP. (F)
HUMIDITY
(%RH)
TEMP. (F)
HUMIDITY
(%RH)
ES1
80
60
28.0
80
36.8
66.3
80.1
ES2
75
57
26.0
75
39.6
63.3
80.0
ES3
70
54
24.0
70
42.3
59.7
81.4
ES4
65
51
22.0
65
44.8
55.7
84.2
ES5
60
48
20.0
60
46.9
51.3
88.5
HL
86
66
32.4
86
38.9
72.4
80.3
Summary of Contents for WeatherMaker 48KC Series
Page 4: ...4 Fig 2 Unit Dimensional Drawing ...
Page 5: ...5 Fig 2 Unit Dimensional Drawing cont ...
Page 23: ...23 Fig 41 Typical Humidi MiZer Adaptive Dehumidification System Humidistat Wiring ...
Page 25: ...25 Fig 43 Typical Control Wiring Diagram Electro Mechanical with W7212 ...
Page 26: ...26 Fig 44 Typical 48KC 04 06 Power Wiring Diagram 208 230 3 60 Unit Shown ...