Carrier 50HCQA04-06 Installation Instructions Manual page 21

Low Voltage Control Connections
Run the low-voltage control leads from the heater module(s)
— VIO and BRN (two of each if two modules are installed;
identify for Module #1) — to the 4-pole terminal board TB4
located on the heater bulkhead to the left of Heater #1. Connect
the VIO leads from Heater #1 and Heater #2 to terminal
TB4-1. Connect the BRN leads to terminal TB4-3. See Fig. 35.
DEFROST
BOARD
E-HEAT
ORN
P3-3
BRN
ORN
1
TB4
VIO
Field
Connections
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)
Fig. 35 — Accessory Electric Heater Control
Connections
BRN
3
VIO BRN BRN
Elec Htr
VIO HR2 BRN
VIO HR1 BRN
CONTROL AND POWER WIRING DIAGRAMS
Figures 36-44 are typical control and power wiring diagrams.
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