5168276-XIM-B-0216
Johnson Controls Unitary Products
27
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.)
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’).
Belt Tension
The tension on the belt should be adjusted as shown in Figure 20.
Figure 20: Belt Adjustment
R
24V~
24 VAC hot supplied for the building pressure
sensor
Connects through circuit trace to 24V~ IN pin HOT
IN8
BLDG
PRES
0-5 VDC positive input from the Building
Pressure sensor
BldgPres parameter reports input status (-.250-.250”/w/-.062-
.062kPa). Used for modulating power exhaust functions when
ExFType selection is Modulating Damper or Variable Frequency
Fan.
C
COM
24 VAC common/0-5 VDC negative for the
building pressure sensor
Connects through circuit trace to 24V~ IN pin COM
BINARY INPUTS at right on lower edge of economizer board
IN9
PURGE
24 VAC hot input from the PURGE dry contact
Purge parameter reports input status (False with 0 VAC input-
True with 24 VAC input). When Purge status is True, heating and
cooling operation is prevented, the indoor blower and power
exhaust fan operate, the economizer actuator is positioned to
100%.
24V~
24 VAC hot supplied for the purge dry contact
Connects through circuit trace to 24V~ IN pin HOT
IN10
EX VFD
FLT
24 VAC hot input from the power Exhaust
Variable Frequency Drive Fault contact
ExFanVFDFlt parameter reports input status (Normal with 0 VAC
input-Alarm with 24 VAC input) when ExFType selection is
Variable Frequency Fan. When ExFanVFDFlt status is Alarm,
EX-FAN fan output is prevented.
24V~
24 VAC hot supplied for the power exhaust
variable frequency drive fault contact
Connects through circuit trace to 24V~ IN pin HOT
Table 15: Simplicity SE Economizer Board Details (Continued)
Board
Label
Cover
Label
Description
Function & Comments
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.
*Never Loosen
(A)
(C)*
(B)
Span Length
Defl Force
