3
Installing the Vertical Power Exhaust
NOTE: Before installing, ensure voltage of power exhaust
agrees with power supply to equipment.
1. Turn off unit power supply and install lockout tag. For
gas units, turn off the gas supply
2. Remove the power exhaust knockout plugs located on
the lower left side of the EconoMi$er accessory. (See
Fig. 2.)
Fig. 2 — Power Exhaust Knockout Location
3. Remove the RTU unit filter panel to allow access to the
inside of the rooftop.
4. The panel covering the horizontal return opening on the
unit may also be removed for easier access and installa-
tion. Be sure to replace this panel when installation is
complete.
5. Install the vertical economizer per the instructions pro-
vided with the economizer. Do not install the rainhood
shipped with the economizer. Set aside the aluminum air
filter for use with the power exhaust.
6. Remove fan shield so power exhaust can lay flat without
bending the shield or damaging the roof.
7. Remove the shipping blocks from the bottom of the
accessory vertical power exhaust. (See Fig. 3.)
Fig. 3 — Shipping Block Removal
8. There may be a hinged door panel in place of the filter
panel. Open the hinged door, remove the screws and
hinges, remove the door and set it aside. Keep all screws
and hinges.
9. Place the power exhaust close to the EconoMi$er to
allow for wiring harness connection.
10. Follow the wiring instructions specific to the
EconoMi$er. Be sure power exhaust wiring does not
interfere with damper operation.
Power Exhaust Wiring with EconoMi$er IV and
EconoMi$er X
Follow these instructions if using the vertical power ex-
haust with EconoMi$er IV or EconoMi$er X accessories.
1. The 2-wire low voltage harness from the power exhaust
and the 24 to 36 in. (610 or 915 mm) low voltage exten-
sion harness are plugged together for shipping. Unplug
these 2 harnesses for installation.
2. Insert the 2-wire low voltage harness plug from the
power exhaust into the top knockout on the EconoMi$er.
(See Fig. 2.)
3. From the rear of the EconoMi$er, connect the 24-in.
(601mm) low voltage extension harness plug to the
power exhaust harness.
4.
For EconoMi$er IV:
Route the other end of the low volt-
age extension harness to the EconoMi$er IV controller.
(See Fig. 4.) The harness is connected to the controller
by connecting the tan wire to the tan wire 24 VAC COM
terminal on the controller. The terminal on the gray wire
is connected to terminal EF1 on the controller. See Fig. 6
and 7 for EconoMi$er wiring diagrams. Install the gray
jumper wire on the controller from the exhaust fan termi-
nal (EF), to the 24 VAC HOT terminals. The gray jumper
is shipped wire tied to the control harness.
For EconoMi$er X:
Route the other end of the low volt-
age extension harness to the EconoMi$er X 12 pin plug,
(PL6). (See Fig. 5.) The gray wire from the low voltage
extension harness connects to the yellow wire coming
from terminal 8 in the 12 pin plug. The tan wire from the
low voltage extension harness connect to the brown wire
coming from terminal 4 in the 12 pin plug. See Fig. 6 and
7 for EconoMi$er X wiring diagrams.
5. The high voltage harness from the power exhaust and the
high voltage extension harness are plugged together for
shipping. Unplug these 2 harnesses for installation.
6. Insert the high voltage harness plug from the power
exhaust into the bottom knockout on the EconoMi$er.
(See Fig. 2 and 4.)
R-410A Rooftop Models Only:
For single point wiring
application, connect the power exhaust power wire har-
ness to the compressor contactor or indoor fan contactor
in the control box. Install the power exhaust power wire
harness into the pressure lugs on the compressor contac-
tor or indoor fan contactor, used for the field power wir-
ing also.
WARNING
Electrical shock can cause personal injury and death.
Before beginning any modification, be certain that the
main-line electrical disconnect switch is in the OFF posi-
tion. Close the main gas supply shutoff valve. Tag discon-
nect switch and gas valve with suitable warning labels.
POWER
EXHAUST
KNOCKOUTS
ECONOMI$ER
SHIPPING
BLOCKS
POWER
EXHAUST
ASSEMBLY
CAUTION
Failure to follow this caution may result in equipment dam-
age.
Be careful to route wires to avoid pinching or cutting
during assembly. It can be difficult to protect the wires
while attaching the power exhaust to the unit.
Summary of Contents for CRPWREXH021A01
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