Template · Service and panels

Heat pump with electric backup heat single line diagram

Outdoor unit and an air handler with a 10 kW heat strip in place of a gas furnace.

A free template with typical ratings, conductor callouts and general notes. Open it, change what differs on your job, fill in the title block and export a PDF.

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Heat pump with electric backup heat single line diagram: outdoor unit and an air handler with a 10 kW heat strip in place of a gas furnace. — Heat pump with electric backup heat. 14 devices on an 11 × 17 in sheet with a title block and notes column.

What the drawing shows

Every device on the sheet, in the order power reaches it.

Symbol	Label	Rating or detail	Conductors feeding it
Utility source	Utility service	120/240V 1φ 3W
Meter	Utility meter	200A socket	Service conductors, per utility
Circuit breaker	200A 2P	Main breaker
Panel	Main panel	200A bus · 120/240V
Circuit breaker	Branch breakers
To (continues off sheet)	To house loads
Circuit breaker	15A 1P	Furnace
Load	Gas furnace
Circuit breaker	40A 2P	Heat pump
Disconnect switch	Disconnect	60A · NEMA 3R, within sight of unit	2 #8 Cu + #10 G
Device	Heat pump (HP)	MCA 28A · MOCP 40A
Circuit breaker	60A 2P	Air handler
Disconnect switch	Disconnect	60A non-fused, at air handler	2 #6 Cu + #10 G
Heater	Air handler	10 kW heat strip, 240V · 45.7A

Notes on the sheet

Heat strip 10 kW ÷ 240V = 41.7A, plus 4A blower = 45.7A; × 125% = 57A, protected at 60A.
Heat pump breaker does not exceed the nameplate MOCP (40A); conductors sized from the MCA (28A). Replace both with the nameplate data of the installed unit.
Service load calculation to include the heat pump and the heat strip. Where controls keep the two from running together, the larger is used.

Diagram is schematic and not to scale. Field-verify existing equipment ratings. Ratings and conductor sizes shown are typical. Confirm against the adopted code, the equipment listing and a load calculation before installation. Code references are to the 2023 NEC and the 2024 Canadian Electrical Code: see references and editions.