Johnson Controls ZL Series Installation Manual page 45

(See Figure 21 for location of hood within the
unit and Figure 22 for installation of the hood.) If
necessary, a flue exhaust extension may be installed
at the point of installation.
Figure 21: Flue exhaust hood shipping location
Figure 22: Flue exhaust hood installed
Options/accessories
Economizer
The economizer can be a factory installed option
or a field installed accessory. If factory installed,
refer to the instructions included with the
outdoor air hood to complete the assembly. Field
installed economizer accessories include complete
instructions for installation.
There are two economizer options. Each is specific
to footprint and unit voltage:
1. Vertical flow application with barometric relief
standard.
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.
The power exhaust factory installed option is for
down flow application only.
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
ZL units are correctly 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.
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 20: Supply air limitations
Model (size)
ZL08 (7.5)
ZL09 (8.5)
ZL12 (10)
ZL14 (12.5)
Installation Manual ZL Series 7.5- 12.5 Ton 60 Hertz R-410A
Johnson Controls Ducted Systems
Supply air (cfm)
Minimum Maximum
2250 3750
2550 4250
3000 5000
3750 6000
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