11
Since 1965
MicroMetl
Figure 26 – Photo of 48LCHSRADH--A00 W7220
Controller Harness Shipped With 48/50LC 07-12
Units
Figure 27 - Use Part of 9962-0407-SAOEXT Harness for MAT Sensor on LC Units
Step LC4.
The connectors on the right side of Figure 25 on
the 48LCHSRADH—A00 harness attach to the Jade W7220
controller installed in the unit control box. See Figures 25 and 28.
48LCHSRADH—A00 harness connectors are labeled to easily
identify the plug-in location on the controller.
Step LC5.
Locate the Compressor Staging Control (CSC) board
in the HVAC unit. When a field-installed economizer is used the J5
jumper on the CSC must be removed. Remove the J5 jumper. See
Figure 28
Step LC6.
The connectors on the left side of Figure 25 on the
48LCHSRADH—A00 harness attach to the unit’s CSC board.
Connect J3 and J5 plugs to the CSC board.
Step LC7.
Screw the green wire with yellow stripe in the
48LCHSRADH—A00 harness to the control box (ground). See
Figures 12 and 28.
Step LC8.
Mount the provided 9901-2021 mixed air temperature
(MAT) sensor (C7250) to the indoor blower. Confirm that the screws
do not interfere with blower rotation. See Figure 15.
IMPORTANT:
The brown and orange wires in the indoor blower section for the
mixed air sensor have spade terminals, and will not connect directly
to the MAT sensor, which requires a 2-pin plug.
Some Economizer Models:
Locate brown and orange MAT wires on the 9962-0407-SAOEXT
harness, see Figure 15. Cut the orange and brown leading to the
2-pin MAT plug. Splice these 2 wires to the brown and orange wires
in the indoor blower section. Connect the 2-pin plug to the mixed air
sensor, see Figures 27 and 28.
Other Economizer Models:
Locate the brown and orange wire on the original Jade harness,
see Figure 27. Disconnect the terminals on the brown and orange
MAT wires, see Figure 27. Connect these terminals to the brown
and orange wires factory installed in the blower section. Connect
the 2-pin plug to the mixed air sensor, see Figure 28.
Step LC9.
Follow steps 21 through 25 earlier in instructions.
Instructions for 48/50LC 07-12 Units Only
Important: This page is for economizer installation instructions on 48/50LC 07-12 units only.
2-Pin Plug
to MAT
BRN
ORG
BRN
ORG
Disconnect Terminals
or Cut and Splice
Use This Section
on LC Units for
Mixed Air Sensor
