5
PL6
Economizer X
Control box
Central
Term Brd
ECONO
W7720
Unplug the 10-pin plug from
PL6 from the Central Terminal
Bo ard (in control box) and plug
into 10-pin plug from W7220
W7220 into ECONO
terminals on Central
Terminal Board
Indoor Blower
Section
SAT
ORN
BRN
48TMHSRSE--A20
harness with 4- pin
plug
Connect SAT sensor and Pink
and Violet wires from PL6 to
the 48TMHSRSE—A20
harness.
See Picture
D. Connect other 10-pin plug from W7220 controller into ECONO
terminals on CTB. See picture above. On the 10-pin take the
red wire with a spade connector and connect it to "R" on the
CTB, take the brown wire with a spade connector and connect
it to "C" on the CTB.
E. Connect 4-pin plug from the W7220 controller to the 4-pin
harness provided with economizer accessory.
F. Route harness back to the indoor blower section of the unit.
G. Mount Supply (or Mixed) Air Temperature sensor, and connect
Brown and Orange wires from harness to the SAT.
H. Connect Pink and Violet wires from harness to the Pink and
Violet wires from PL6 economizer harness
Fig. 9 - Harness Detail
WIRING INSTRUCTIONS FOR SINGLE OR MULTIPLE SPEED
INDOOR FAN
A. Install W7220 (with harnesses attached) in unit control box.
See wiring diagram in instructions.
B. Unplug 10-pin plug shown above in picture, from Central
Terminal Board (CTB).
C. Attach 10-pin plug disconnected from (CTB) to 10- pin plug
harness from W7220 controller.
12. Locate the mixed (supply) air temperature sensor in the
economizer hardware bag. Mount the sensor in the indoor
fan section of the unit, see Figure 12. Locate the orange
and brown wires in the wire bundle in the indoor fan section.
Connect these orange and brown wires to the 2-wire harness
attached to the Sensor.
Mixed air default setting is 53°F and can be adjusted from 38°F
to 70°F.
13. While everything is open, install and wire any other accessories
and/or sensors as applicable and convenient, per their
installation instructions and/or the Conguration section of this
instruction. Some accessories require that unit ducting already
be installed.
NOTE: If also installing a power exhaust accessory, skip step 14
and follow the power exhaust instructions instead.
14. Install the Ultra Low Leak Economizer hood over the Ultra Low
Leak Economizer. Use screws provided.
15. The W7220 controller is shipped mounted to a bracket. Install
the controller / bracket in the top left corner of the unit control
box as shown in wiring diagram, Fig. 9 and 10A. Screw in
place through pre-punched holes.
16. For 1 and 2 speed units connect the plugs coming from the
controller as shown in wiring diagram, Fig. 9 and 10A.
NOTE: Provided harness will be connected as shown in Fig. 9
and 10A.
17. For 3 speed (48/50LC 07-12) units, the harness attached to
the W7220 controller must be removed, and can be discarded.
Locate harness shipped in plastic bag in the control box of unit.
Attach this harness to the W7220 controller as shown in Fig
10B and 10C.
NOTE: Harness provided with economizer is not used with 3 speed
(48/50LC 07-12) units.
18. Adjust controller settings (minimum position, outside air, etc.)
per instructions detailed later in this instruction.
19. Follow all local and other applicable codes.
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