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524581-YIM-I-0512
Figure 28: Enthalpy Set Point Chart
Figure 29: Honeywell Economizer Control W7212
Phasing
®
Predator
units are properly phased at the factory. Check for
proper compressor rotation. If the blower or compressors rotate
in the wrong direction at start-up, the electrical connection to
the unit is misphased. Change the phasing of the Field Line
38
CONTROL POINT
CONTROL
0
0
APPROX.
F (
C)
CURVE
AT 50% RH
A
73 (23)
B
70 (21)
C
67 (19)
D
63 (17)
50
(10)
45
(7)
40
(4)
35
(2)
35
40
45
50
(2)
(10)
(4)
(7)
APPROXIMATE DRY BULB TEMPERATURE -
Exhaust Air
Adjustment
Screw
N1
Exhaust Air LED
Damper Min.
Position
P1
Screw
Indoor Air Quality
T1
Max. Adjustment
Screw
Indoor Air Quality
LED
AQ1
Indoor Air Quality
Min. Adjustment
SO+
Screw
Free Cooling LED
SR+
Economizer Enthalpy
Set Point Adjustment
Screw
85
90
(29)
(32)
80
(27)
75
(24)
70
(21)
65
(18)
60
(16)
55
A
(13)
B
C
D
A
B
C
D
55
60
65
70
75
80
85
90
(13)
(16)
(21)
(24)
(27)
(29)
(32)
(18)
EXH
N
Set
EXH
P
Min
Pos
T
IAQ
Max
IAQ
AQ
IAQ
Min
SO
Free
Cool
SR
B
C
A
D
Connection at the factory or field supplied disconnect to
obtain proper rotation. (Scroll compressors operate in only one
direction. If the scroll is drawing low amperage, has similar
suction and discharge pressures, or producing a high noise
level, the scroll is misphased.)
95
100
105
110
(35)
(38)
(41)
(43)
95
100
105
110
(38)
(41)
(43)
(35)
0
0
F (
C)
TR
TR1
24
24
Vac
Vac
HOT
COM
+
1
2
5
3
4
EF
EF1
Johnson Controls Unitary Products
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