2
The wire shall be sized to include power exhaust MCA and
MOP. See Table 2 for electrical data.
FLA MCA
MOP
FLA MCA
MOP
0270L01170 1.7
2.1
3.7 1.5
1.9
3.4
0270L01137 3.3
4.1
5.4 3.0
3.8
4.9
PART
NUMBER
208V, 1PH, 60Hz 230V, 1PH, 60Hz
FLA MCA
MOP
0270L01171 0.5
0.6
1.1
0270L01138 1.0
1.3
1.6
460V, 3PH, 60Hz
PART
NUMBER
Table 2 - Electrical Data
FLA
- Full Load Amps
MCA
- Minimum Circuit Amps
MOP
- Maximum Overcurrent Protection
N/A
- Not Applicable
To install the horizontal power exhaust, perform
the following procedures:
1. Turn off unit power supply and install lockout tag. For
gas units, turn off the gas supply.
NOTE: Before installing, ensure voltage of
power exhaust agrees with power supply to the
equipment.
CAUTION
UNIT DAMAGE HAZARD
FAILURE TO FOLLOW THIS CAUTION MAY RESULT IN EQUIPMENT DAMAGE.
BE CAREFUL TO ROUTE WIRES TO AVOID PINCHING OR CUTTING DURING
ASSEMBLY. IT CAN BE DIFFICULT TO PROTECT THE WIRES WHILE ATTACHING
THE POWER TO THE UNIT.
CAUTION
CUT / SEVER HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs. Use
care and wear appropriate protective clothing, safety
glasses and gloves when handling parts and servicing
air conditioning equipment.
2. Cut a rectangular opening in the return air duct with
the opening edge 36 inches from the horizontal return
opening on the RTU. Drill pilot holes around perimeter
of opening using a #27(Ø 0.144 inch) drill bit; See
Figures 8 & 9 for dimensional details.
3. Install the horizontal economizer per the instructions
provided with the economizer. For 7½-12½ Ton
applications, do not install the Barometric Relief Hood
shipped with the economizer.
4. Remove the shipping blocks from the bottom of the
accessory horizontal power exhaust. (Fig 1)
SHIPPING BLOCKS
POWER EXHAUST ASSEMBLY
Figure 1 - Shipping Block
5. Place the power exhaust close to the duct opening to
allow for wiring harness connections.
6. Follow the wiring instructions specific to the
economizer. Be sure power exhaust wiring does not
interfere with damper operation.
POWER EXHAUST WIRING FOR W7220
CONTROLLER
1. Plug the supplied low voltage harness into the 4-pin
connector located in the upper knockout on the power
exhaust assembly. (Fig. 2 & 3)
2. Route the low voltage harness through the duct
opening and wire grommet (located on economizer),
then connect the wires to the W7220 controller. See
wire diagrams on pages 6 and 7 for details.
3. Plug the supplied high voltage harness into the 4-pin
connector located in the lower knockout on the power
exhaust assembly. (Fig. 2 & 3)
4. Route the high voltage harness through the duct
opening and wire grommet (located on economizer).
