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INSTALLER’S GUIDE
4. Install Economizer Assembly
NOTE: You must install the lter rack per the instructions
provided with the lter rack after you install the economizer.
1. The economizer ships with the return air damper folded
up to allow the assembly to t through the Coil opening
in the side of the unit. Insert the economizer assembly into the
unit through the Coil access panel opening. See Figure 4 on
page 4.
2. Swing the return air damper section down so that it rests
on the bottom of the unit. The economizer will sit completely
over the return air opening in the bottom of the unit. See
Figure 5 on page 4. Screw the economizer assembly together
with one assembly screw in the side of the economizer. Check
the linkage rod between the return air dampers to make sure it
is tight.
3. Insert 2 screws through the holes in the front face of the
unit and into the matching attachment holes in the economizer
assembly. See Figure 6 on page 5.
4. Insert a screw through the pre-punched hole in the side
ange of the return air damper and into the mating hole
in the economizer assembly and tighten. See Figure 5 on page
4.
5. Install Rain Hood Assembly
1. Locate the rainhood assembly, which includes the relief damper
and the mist eliminator. The back of the hood side mating anges
need to be gasketed (gaskets included in kit). Loosen the right two
(2) screws on the unit’s top sealing ange above the economizer.
See Figure 7 on page 5.
2. Slide the top ange of the hood underneath the unit’s top sealing
ange. Drive two self tapping screws into the keyhole openings on
the side anges of the hood. Tighten the two (2) screws on the top
sealing ange and the screws on the hood side anges. See
Figures 7 and 9.
6. Mount Mixed Air Sensor
1. Mount the Mixed Air sensor (with wiring) to the left Blower
partition using two sheetmetal screws. See Figure 10, page 7. The
male tabs on the Yellow and Yellow/Black wires will connect to
the Economizer wiring harness in a later step.
2. Enthalpy SensorIf used, install this option at this time per
instructions provided in the sensor kit.
7. Route Main Wiring
1. From the Economizer assembly, pass the wire harness through the
coil grommet. See Figure 11 (view A) on page 7. Continue routing
the harness behind the Compressor compartment and into the
Blower compartment.
2. Continue routing the remaining harness through the grommet in
the Control Box partition and into the Control Box.
8. Complete Installation (4WCZ6, 4DCZ6, 4YCZ6)
1. In the Control Box, locate the ICMC Board in the upper left hand
corner of the Control Box. Find the YL/RD and YL wires in the 12
pin connector. Leaving enough length of these wires so that the
ends going to the ICMC Board can be stripped, cut these wires in
two. Strip the cut end of the wires going to the ICMC Board and
connect to economizer wires as per hookup diagrams on pages 8
and 9. Cap the ends of the Yellow and Yellow/Red wires not
being hooked up. Secure all wires with wire ties so that there is no
interference with any moving parts in the unit.
2. In the Control Box, complete the wiring connections per the
appropriate wiring diagram on pages 8 and 9. Secure all wires so
that there is no interference with any moving parts in the unit.
3. Power the economizer and run the checkout procedure on page
10. Make desired adjustments to the controller setting the
minimum occupied damper position, the outside air setting (if
enthalpy control used).
4. Replace the unit Coil access panel, the Blower access panel, and
the Control/Heat access panel.
CAUTION
Be certain to cap the ends of the cut YL/RD and YL wires
that are not being connected to an accessory or the unit to
reduce the risk of a short.
!
CAUTION
Use care when inserting the economizer in the return
air compartment, to prevent damaging the foil faced
insulation.
!
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