5
16. Connect the air quality plug marked “ECB-J5” from the
unit electrical harness into the Economizer Control Board
plug J5. Be sure to connect the plug with the proper orien-
tation such that the locking tabs capture the plug.
17. Connect plug marked “ECB-J4” from the unit electrical
harness into the Economizer Control Board plug J4. Be
sure to connect the plug with the proper orientation such
that the locking tabs capture the plug.
18. Route the wires from the harness installed during Steps 6-
8 into the control box. (See Fig. 11.) The wires should be
routed into the box through the hole located at the bottom
right corner of the control box, behind the field connec-
tion terminal blocks. Use the other bushing provided to
install the wires so that the control box does not damage
them.
19. Connect the plug marked “ECB-J8 (16-18)” to the J8
connector on the Economizer Control Board, plug J8,
pins 16 through 18. Connect the plug marked “ECB-J7”
to the J7 plug on the Economizer Control Board.
20. Several wires will need to be connected to the BACK-
SIDE of the terminal strips TB4 and TB5. The wires are
marked with the appropriate locations. Connect the wires
as marked to the back of the TB4 terminal strip, locations
1 and 7. Connect the wires as marked to the back of the
TB5 terminal strip, locations 6, 7, 8 and 9. Connect the
red power wire marked “CB1” to the CB1 circuit breaker
on the load side.
21. Secure all wires so that they do not rub any sharp edges or
interfere with any moving parts.
22. Replace the control box cover using the screws saved
from Step 13.
23. Power can now safely be restored to the unit.
FU2
FU1
FU3
FU4
WIRE ROUTING
PLASTIC
BUSHING
CB1
CB2
CB3
ECB
TB2
TB4
TB3
TB5
Fig. 11 — Wiring Installation into Control Box
LEGEND
FU
—
Fuse
CB
—
Circuit Breaker
ECB —
Economizer Control Board
TB
—
Terminal Block
