Honeywell Economizer Control W7212; Belt Adjustment - York ZF 180 Series Installation Manual

1061903-XIM-A-0713
Figure 20: Honeywell Economizer Control W7212
Phasing
®
York Model ZF 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').
24
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
Vac
EXH
P
HOT
Min
Pos
T
IAQ
Max
IAQ
AQ
IAQ
Min
SO
Free
Cool
SR
B C
A
D
Belt Tension
The tension on the belt should be adjusted as shown in Figure 21.
Figure 21: Belt Adjustment
TR TR1
24 24
Vac
COM
+
1
2
5
3
4
EF EF1
Defl Force
(B)
*Never Loosen
(A)
(C)*
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