2. Horizontal Flow application with barometric
relief standard.
Power exhaust
The Power Exhaust is a field installed accessory.
Field installed Power Exhaust accessories include
complete instructions for installation.
There are two field installed Power Exhaust
accessories:
1. Down Flow application.
2. Horizontal Flow application that requires the
purchase of a barometric relief hood.
Rain hood
All of the hood components, including the mist
eliminators, the gasketing and the hardware for
assembling, are packaged and located between
the condenser coil section and the main unit
cabinet, if the unit has factory installed options.
If field installed accessories are being installed all
parts necessary for the installation comes in the
accessory.
Blower phasing
ZY units are properly phased at the factory. Check
for proper blower rotation. If the blower rotates
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.
CAUTION
When installing equipment in a facility with a 3 phase
high-leg delta power supply, care must be taken to
ensure that the high-leg conductor is not attached to
either of the two legs of the (single phase, direct drive)
X13 or ECM motors. Failure to do so can result in the
motor acting erratically or not running at all.Check for
the high leg conductor by checking voltage of each
phase to ground.
Example: A or L1 phase to ground, voltage reading
is 120V. B or L2 phase to ground, voltage reading
is 195 to 208V. C or L3 phase to ground, voltage
reading is 120V. Therefore B or L2 phase is the high
Leg. The high should always be wired to the center
or B or L2 tap.Note: Check all three phase motors
and compressors for proper rotation after making a
change. If it is necessary to change 3 phase motor
rotation, swap A or L1 and C or L3 only.
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
Blower phasing).
Table 27: Supply Air Limitations
Supply Air (CFM)
Model (Size)
Minimum Maximum
ZY04 (3) 900 1500
ZY05 (4) 1200 2000
ZY06 (5) 1500 2500
ZY07 (6) 1800 3000
ZYA7 (6) 1800 3000
ZY08 (7.5) 2250 3750
ZY09 (8.5) 2550 4250
ZY12 (10) 3000 5000
INSTALLATION MANUAL ZY SERIES 3-10ton 60 Hertz R-410A 81
Johnson Controls Ducted Systems
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