Description
The HAC-12H combines two features in one unit: the 120 Vac built-in transformer of the HAC-12 and the 10% heat bypass blade of the HAC-H. For one specific situation: hot air supply duct zone control on a 120 Vac site. Both conditions must be present to justify this product. If only one applies, one of the single-feature variants is the correct order. CSA certified. Sizes 4"–9".
Do not supply 24 Vac to a HAC-12H. The built-in transformer requires 120 Vac input. Supplying 24 Vac will result in product damage and will not operate the damper.
Do not install on fresh air intake, make-up air, or ventilation applications. The 10% bypass is permanent and cannot be disabled: outdoor air infiltrates continuously through the bypass whenever the damper is commanded closed.
Confirm PO vs. PC before ordering. The action is set at the factory. If it needs to change, it can be converted in the field by removing the motor, reversing the spring plate, and remounting the drive, following the Hoyme conversion procedure. For most hot air zone control applications PO is correct. PC is used only when the zone must fail open on power loss; confirm with the system designer.
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Built-in 120 Vac to 24 Vac transformer: one switched 120 Vac circuit to the damper; no separate transformer, no low-voltage wiring run required
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10% bypass machined into the blade at the factory: permanent, not field-adjustable; maintains minimum flow through closed zones, prevents high-limit trips on single-speed furnaces
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Same spring return operation as the standard HAC: Hansen motor with 24 Vac spring return internally; same PO/PC fail-safe behavior
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PO or PC action, end switch available: all factory-installed; relay not available on any 120 Vac motor code variant
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Canada/USA CSA certified
| Job Condition | Right Product |
|---|---|
| 120 Vac supply + hot air duct zone control (bypass needed) | HAC-12H: this product |
| 120 Vac supply + fresh air intake or make-up air (full shutoff needed) | HAC-12 |
| 120 Vac supply + cold climate damper location (insulation needed, no bypass) | HAC-12L |
| 24 Vac supply + hot air duct zone control (bypass needed) | HAC-H |
| 24 Vac supply + fresh air intake or make-up air | HAC (standard) |
Supply Voltage
120 Vac: built-in transformer
Bypass
10%: factory machined, permanent
Sizes
4"–9"
Action
PO or PC
Not Suitable For
Fresh air, make-up air, ventilation
Relay
Not available: use HAC-H (24 Vac)
Need relay output or an ADP furnace fan interlock? The 120 Vac motor code does not include relay capability. For zone control applications requiring a relay output or furnace fan interlock, use the HAC-H (24 Vac) with the relay option and ADP relay adaptor. For 120 Vac sites requiring relay output, discuss the control circuit approach with your wholesaler.
2-year electrical · 10-year mechanical warranty
CSA certified · Made in Canada
Product image is representative only. Actual product may differ in appearance depending on size, configuration, and options selected at order.
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