Laars MagnaTherm HTD Series Installation And Operation Instructions Manual page 49

3 3
Wiring Diagram is located on the inside front panel.
HTD
4 4
R R
BK BK
G G
TB1-6:3
W W
TB1-9:3
BK/O BK/O
TB1-12:1
O2 Sensor
Page 45
TB1-6:3
TB1-9:3
TB1-12:1
O2 Sensor