Belt Adjustment - York ZF Series Installation Manual

Table 15: Smart Equipment™ Economizer Board Details (Continued)
Board Cover
Label Label
R
24V~
BLDG
IN8
PRES
C
COM
PURGE
IN9
24V~
EX VFD
FLT
IN10
24V~
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').
Johnson Controls Unitary Products
Description
24 VAC hot supplied for the building pressure
sensor
0-5 VDC positive input from the Building
Pressure sensor
24 VAC common/0-5 VDC negative for the
building pressure sensor
BINARY INPUTS at right on lower edge of economizer board
24 VAC hot input from the PURGE dry contact
24 VAC hot supplied for the purge dry contact
24 VAC hot input from the power Exhaust
Variable Frequency Drive Fault contact
24 VAC hot supplied for the power exhaust
variable frequency drive fault contact
Function & Comments
Connects through circuit trace to 24V~ IN pin HOT
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.
Connects through circuit trace to 24V~ IN pin COM
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%.
Connects through circuit trace to 24V~ IN pin HOT
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.
Connects through circuit trace to 24V~ IN pin HOT
Belt Tension
The tension on the belt should be adjusted as shown in Figure 20.
(A)
Figure 20: Belt Adjustment
5326601-XIM-A-0117
Defl Force
(B)
*Never Loosen
(C)*
27