York International ZQ Series Installation Manual page 10

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 for the factory RAT sensor location
and Figure 5 for the sensor relocation.
10 INSTALLATION MANUAL ZQ SERIES 3 - 5 ton 60 Hertz R-410A
Figure 4: Factory-mounted return air
temperature sensor
A
B
Figure 5: Supply and return air ducts
A
B
7. If an optional return air smoke detector is
installed, you must move the return air sensor
from the factory-shipped position (upside
down) to the working position (right side up).
Then slide the flex tube over the stub and
tighten, see Figure 7.
Johnson Controls Ducted Systems
Filter rack and filters
RAT sensor
Supply air duct
Return air duct