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Installation Instructions for 48/50LC 07-12 Units
ONLY
IMPORTANT: This section is for economizer installation
instructions on 48/50LC 07-12 units only.
1.
Follow Steps 1 through 10 on pages 4-5.
2.
The 48/50LC 07-12 units require different wiring than is
factory-attached to the W7220 controller. Disconnect the
complete wiring harness factory-attached to the W7220
controller, as shown below in Fig. 26. This harness can be
discarded.
Fig. 26 — Remove Complete Harness
Factory-Attached to W7220 Controller
NOTE: The 4-wire 48TMHSRSE--A20 harness provided with the
economizer will also NOT be used on the 48/50LC07-12 units.
(See Fig. 27.)
3.
The 48/50LC 07-12 units that do not have a factory-installed
economizer will have a new W7220 controller wiring harness
shipped in the control box section of the HVAC unit. This
harness, Carrier part number 48LCHSRADH--A00, is shown
in Fig. 28 and 29.
Fig. 28 — 48LCHSRADH--A00 W7220 Controller Harness Shipped With 48/50LC 07-12 Units
4.
The connectors on the right side of Fig. 28 on the
48LCHSRADH--A00 harness attach to the W7220
controller installed in the unit control box. See Fig. 28
and 30. 48LCHSRADH--A00 harness connectors are
labeled to easily identify the plug-in location on the
controller.
5.
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 Fig. 30.)
6.
The connectors on the left side of Fig. 28 on the
48LCHSRADH--A00 harness attach to the unit's CSC board.
Connect J3 and J5 plugs to the CSC board.
7.
Screw the green wire with yellow stripe in the
48LCHSRADH--A00 harness to the control box (ground).
(See Fig. 13 and 30.)
8.
Mount the provided HH79ZZ007 mixed-air temperature
(MAT) sensor to the indoor blower. Confirm that the screws
do not interfere with blower rotation. (See Fig. 16.) Connect
the (2) spade terminals on the HH79ZZ007 sensor to orange
and brown wires in the indoor blower section wire bundle.
9.
Follow Steps 21 through 25 on page 8 in this book.
Fig. 27 — 48TMHSRSE--A20
NOT Used on 48/50LC 07-12 Units
11
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