10
Electrical Specications by Heater Input
Item # kW Max
Amps
Required Breaker Req. Wire Size
AT-912-18TP2 18 75 2 x 40A Double Pole 2 x 8/2 AWG with Ground
AT-912-24TP2 24 100 3 x 40A Double Pole 3 x 8/2 AWG with Ground
AT-912-29TP2 29 120.8 3 x 40A Double Pole 3 x 8/2 AWG with Ground
Power Rates
Item # 240V 220V 208V
AT-912-18TP2 18,000 Watts 15,125 Watts 13,520 Watts
AT-912-24TP2 24,000 Watts 20,166 Watts 18,026 Watts
AT-912-29TP2 29,000 Watts 24,368 Watts 21,782 Watts
Terminal Block in Unit
40 Amp
Double Pole
40 Amp
Double Pole
Unit Requires 10 AWG ground wire - one for each 240V circuit
L1L1 L2
8/2 AWG
8/2 AWG
L2
240V
240V
L1 L2 L1 L2
Wiring Diagram for 18kW
Wiring Diagram for 24kW, 29kW
40 Amp
Double Pole
40 Amp
Double Pole
40 Amp
Double Pole
Unit Requires 10 AWG ground wire - one for each 240V circuit
L1L1L1 L2
8/2 AWG
8/2 AWG
8/2 AWG
L2L2
240V
240V
240V
L1 L2 L1 L2 L1 L2
Terminal Block in Unit