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689670-BIM-A-0311
Figure 24: Enthalpy Set Point Chart
Figure 25: Honeywell Economizer Control W7212
Phasing
ZU 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
32
HIGH LIMIT CURVE W7212
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
EXH
N
Set
EXH
Vac
P
HOT
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.)
TR
TR1
24
24
Vac
COM
+
1
2
5
3
4
EF
EF1
Johnson Controls Unitary Products
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