11
INSTRUCTIONS FOR 48/50LC
07-12 UNITS ONLY
1. Follow steps 1 through 19 in the Installation section.
2. The 48/50LC 07-12 units require different wiring than is
factory-attached to the W7220 Jade controller. Disconnect
the complete wiring harness factory-attached to the
W7220 Jade 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 48/50LC 07-12 units,
see Fig. 27.
Fig. 27 — 48TMHSRSE--A20 Not Used on 48/50LC 07-
12 Units
3. The 48/50LC 07-12 units that do not have a factory-installed
economizer will have a new Jade W7220 controller wiring
harness shipped in the control box section of the HVAC unit.
This harness, Carrier part number 48LCHSRADH-A00, is
shown below in Fig. 28 and 30.
Fig. 28 — 48LCHSRADH-A00 W7220 Controller Harness Shipped With 48/50LC 07-12 Units
IMPORTANT: This section is for economizer installation in-
structions on 48/50LC 07-12 units only.
