Johnson Controls ZY Series, Installation Manual

Page: 10 / 144

CAUTION
208/230-3-60 and units with factory installed
Powered Convenience Outlet Option are
wired for 230v power supply. Change tap on
transformer for 208-3-60 operation. See unit
wiring diagram.
5. For gas heating models, you must move
the supply air temperature (SAT) sensor to
the working position to ensure proper SAT
readings. The SAT sensor is shipped in the
supply air compartment.
a. Move the SAT sensor to the inside
of the supply air duct. See Item A in
Figure 5.
b. Use the excess wire available to its
full length to drop or mount the SAT
sensor in the duct. Avoid close contact
with the gas heat exchanger.
c. Use the shipping bracket to hold the
SAT sensor in the supply air stream.
See Figure 3 for the factory SAT sensor
location and Figure 5 for the sensor
relocation.
Figure 3: Supply air temperature sensor
6. For units equipped with an economizer or
motorized OD air damper, you must move
the return air temperature (RAT) sensor to
the working position to ensure proper RAT
readings. See Item B in Figure 5.
a. Move the RAT sensor to the inside
of the return air duct verifying that
the sensor is at least 6 in. below the
unit duct opening. The sensor must
read the return air temperature not
mixed return air and outdoor air
temperatures.
b. Use the excess wire available to its
full length to drop or mount the RAT
sensor in the duct.
c. You can use the shipping bracket to
hold the RAT sensor in the return air
stream. See Figure 4 for the factory
RAT sensor location and Figure 5 for
the sensor relocation.
Figure 4: Factory-mounted return air
temperature sensor
Item Description
A Filter rack and filters
B RAT sensor
INSTALLATION MANUAL ZY SERIES 3 - 10 ton 60 Hertz R-410A 10
Johnson Controls Ducted Systems