![background image](http://html.mh-extra.com/html/carrier/weathermaker-50fc-16-series/weathermaker-50fc-16-series_installation-instructions-manual_2560322035.webp)
35
2SP H/C (2 SPEED HEAT/COOL) SPEED FAN OPERATION
FAN TYPE = 2SP H/C is not used on 50FC-*16 units
3 SPEED FAN OPERATION
FAN TYPE = 3SPEED is not used on 50FC-*16 units
ENTHALPY SETTINGS
When the OA temperature, enthalpy and dew point are below the
respective set points, the Outdoor Air can be used for economiz
-
ing. Figure 51 shows the new single enthalpy boundaries in the
W7220. There are 5 boundaries (set points ES1 through ES5),
which are defined by dry bulb temperature, enthalpy and dew
point.
Refer to Table 10 for ENTH CURVE set point values.
The W7220 calculates the enthalpy and dew point using the OA
temperature and humidity input from the OA enthalpy sensor.
When the OA temperature, OA humidity and OA dew point are
all below the selected boundary, the economizer sets the econo
-
mizing mode to YES, economizing is available.
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.
Figure 51 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.
Table 10 provides the values for each boundary limit.
Fig. 51 — Single Enthalpy Curve Boundaries
ECONOMIZING
AVAILABLE
NOT AVAILABLE
ENTHALP
Y
RA
HUM (%RH)
RA
TEMP
TEMPERATURE
ABSOLUTE HUMIDITY
ES5
ES4
ES3
ES2
ES1
HL
P1
(T,RH)
P2 (T,RH)
SINGLE ENTHALPY
DUAL ENTHALPY
HIGH LIMIT
Table 10 — Single Enthalpy and Dual Enthalpy High Limit Curves
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 50FC-16 Series
Page 4: ...4 Fig 2 50FC 16 Unit Dimensional Drawing ...
Page 5: ...5 Fig 2 50FC 16 Unit Dimensional Drawing cont ...
Page 8: ...8 Fig 5 50FC 16 Roof Curb Details ...
Page 21: ...21 Fig 42 Typical Control Wiring Diagram Electro Mechanical with W7220 Controller ...
Page 22: ...22 Fig 43 Typical Control Wiring Diagram SystemVu Controller ...
Page 23: ...23 Fig 44 Typical Power Wiring Diagram 208 230 460 3 60 Unit Shown ...
Page 24: ...24 Fig 45 Typical Power Wiring Diagram 575 3 60 Unit Shown ...
Page 41: ......