9
and can be removed from the W7220 and discarded. Follow all
local and other applicable codes.
Wiring Instructions for 1 and 2 Speed Units
1. Install W7220 (with harnesses attached) in unit top left of
control box. See wiring diagram in instructions.
2. Mount supply air temperature (SAT) sensor, with 2 wire SAT
harness attached, in the indoor blower section.
3. Unplug the EconoMi$er X harness from PL6 with 10-pin
plug shown in Fig. 27, from Central Terminal Board (CTB).
4. Attach 10-pin plug disconnected from (CTB) to 10-pin plug
harness from W7220 controller.
5. Connect other 10-pin plug from W7220 controller into
ECONO terminals on CTB. (See Fig. 27.)
6. Inside control box – connect 4-pin plug from the W7220
controller to the 4-pin 50HEHMRAE--A10 harness provided
with economizer accessory.
7. Inside the control box – the brown and orange wires with
male terminals from the 50HEHMRAE--A10 harness
connect to the female terminals on the pink and violet wires
from the PL6 harness.
8. Inside the control box – connect the pink and violet wires
with female terminals on 50HEHMRAE--A10, to the pink
and violet wires with male terminals from the PL6 harness.
9. Inside the Indoor Blower Section connect the pink and violet
wires from the PL6 harness to the (2) green wires leading to
the SAT.
Fig. 27 —
Harness Detail
PL6
SAT
ORN
BRN
CONTROL BOX
CENTRAL
TERM.BRD
.
ECONO
W7720
48TMHSRSE--A20
SEE DETAIL
Unplug the 10-pin plug from
Pl6 from the central terminal
Board (in control box) and plug
Into 10-pin plug from W7220.
Plug 10-pin from
W7220 into econo
Terminals on central
Terminal board.
INDOOR BLOWER
SECTION
CONNECT SAT SENSOR AND PINK
AND VIOLET WIRES FROM PL6 TO
THE 48TMHSRSE--A20
HARNESS.
HARNESS WITH 4-PIN
PLUG
ECONOMIZER X
