Supply Air Limitations; Honeywell Economizer Control W7212; Belt Adjustment - York ZF150 Installation Manual

518674-YIM-C-0610
Figure 28: 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.)
Scroll compressors require proper rotation to operate
correctly. Units are properly phased at the factory. Do
not change the internal wiring to make the blower
condenser fans, or compressor rotate correctly.
Blower Rotation
Check for proper supply air blower rotation. If the blower is
rotating backwards, the line voltage at the unit point of power
connection is misphased (See 'PHASING').
Table 13: Supply Air Limitations
Unit Size (Ton)
078 (6.5)
090 (7.5)
102 (8.5)
120 (10)
150 (12.5)
38
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
Minimum Maximum
1950 3250
2250 3750
2550 4250
3000 5000
3750 6250
EXH
N
N1
Set
EXH
P1
P
Min
Pos
T1
T
IAQ
Max
IAQ
AQ1 AQ
IAQ
Min
SO+ SO
Free
Cool
SR
SR+
B C
A
D
Belt Tension
The tension on the belt should be adjusted as shown in Figure 29.
A
A
Figure 29: Belt Adjustment
TR TR1
24 24
Vac Vac
HOT COM
+
1
2
5
3
4
EF EF1
C*
* NEVER LOOSEN
B
SPAN LENGTH
DEFL. FORCE
Johnson Controls Unitary Products
A