524581-YIM-I-0512
38
Johnson Controls Unitary Products
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
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.)
40
(4)
70
(21)
50
(10)
55
(13)
60
(16)
65
(18)
35
(2)
45
(7)
75
(24)
80
(27)
35
(2)
40
(4)
45
(7)
50
(10)
55
(13)
60
(16)
65
(18)
70
(21)
75
(24)
80
(27)
85
(29)
85
(29)
90
(32)
90
(32)
105
(41)
110
(43)
100
(38)
95
(35)
95
(35)
100
(38)
105
(41)
110
(43)
APPROXIMATE DRY BULB TEMPERATURE -
0
F (
0
C)
D
D
C
C
B
B
A
A
CONTROL
CURVE
CONTROL POINT
APPROX.
0
F (
0
C)
AT 50% RH
A
D
C
B
63 (17)
73 (23)
70 (21)
67 (19)
N1
N
P1
P
EXH
Set
EXH
Min
Pos
IAQ
Max
IAQ
IAQ
Min
Free
Cool
T
T1
AQ1
AQ
SO+
SO
SR+
SR
A
B
C
D
TR
TR1
24
Vac
HOT
24
Vac
COM
EF
EF1
2
3
4
5
1
+
Exhaust Air
Adjustment
Screw
Exhaust Air LED
Damper Min.
Position
Screw
Indoor Air Quality
Max. Adjustment
Screw
Indoor Air Quality
LED
Indoor Air Quality
Min. Adjustment
Screw
Free Cooling LED
Economizer Enthalpy
Set Point Adjustment
Screw
