Form CP-MAPS-D12 with FX05, P/N 209341 Rev 4, Page 11
1
5
2
0
2
5
3
0
3
5
4
0
4
5
5
0
2
5
2
0
1
5
1
0
5
0
5
5
4
5
6
0
ENTHALPY
(h)
-
BTU
PER
POUND
DRY
AIR
ENTHALPY (h) - BTU PER POUND DRY AIR
4
0
3
5
3
0
EN1 = 29
EN2 = 34
EN3 = 39
DP1 = 60°F
Dewpoint
25
°F
30
°F
35
°F
35°
F
40
°
F
40°
F
45
°
F
45
°
F
50
°
F
50
°
F
55
°
F
55
°
F
60
°F
60
°
F
65°
F
65
°
F
75
°
F
75
°
F
70
°
F
70
°
F
80
°
F
80
°
F
85°
F
W
E
T
BU
L
B
T
EMPERA
T
UR
E
90
°
F
85°
F
100°F DRY BULB TEMPEATURE
120
115
110
105
95
90
85
80
75
70
65
60
55
50
45
40
35
10%
RE
LA
TI
VE
HUM
I
D
IT
Y
20
%
30
%
40
%
50
%
60
%
70
%
80
%
90
%
.024
.026
.028
.014
.016
.018
.020
.022
HUMIDITY RATIO (w) - pounds moisture per pound dry air
.004
.006
.008
.010
.012
.002
SPECIFIC
VOLUME
(CU.
FT.
PER
LB.
DRY
AIR): 1
5
12.5
13.0
13.5
14.5
14.0
FIGURE 6 - Optional humidity transmitter measures outdoor air humidity and controls
compressor operation based on enthalpy settings EN1, EN2, EN3
Example:
1) When the outside air temperature is 90ºF with 10%RH, the
enthalpy is ~27. The standard enthalpy setting EN1 (29) will not
allow cooling mode to be active.
2) When the outside air temperature is 85°F with 50%RH, third
stage is not allowed.
3) When the outside air temperature is 95°F with 40%RH, third
stage is not allowed.
Compressor
Stage Available
Enthalpy 1st 2nd 3rd
27 -- -- --
29 x -- --
35 x x --
40 x x x
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