Description
Hoyme inline damper body with Belimo LMB24-SR-T modulating actuator. Proportional blade positioning via 2–10 VDC analog signal, same control input as the HAC-43 (TFB24-SR-T). One difference: the LMB24-SR-T has no spring return. On power loss, the blade holds its last position rather than moving to a defined fail-safe state. Sizes 6"–20" in even-inch increments.
⚠ No Spring Return: Holds Last Position on Power Loss
On power loss, the HAC-60 blade stays at its last position. It does not move to a defined open or closed fail-safe position. If your application requires the damper to move to a defined position on power loss, whether to close and seal the duct or to open and ensure ventilation, use the HAC-43 (TFB24-SR-T), which provides the same 2–10 VDC modulating control with spring return fail-safe.
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2–10 VDC proportional blade positioning: same control input as HAC-43; blade tracks the analog signal continuously across the full range of travel
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Holds last position on power loss: preferred behavior on most commercial BAS installations; avoids abrupt airflow changes on brief power interruptions while the DDC resumes control
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Belimo LMB24-SR-T: factory-mounted to Hoyme damper body. Single SKU, ready to install; actuator field-replaceable through Belimo distributors
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24 Vac or 24 Vdc supply: compatible with BAS and DDC analog output cards; same supply flexibility as HAC-43
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Heat bypass (-H) available on all sizes: factory-installed; for hot air supply duct zone control only; do not specify -H on fresh air or ventilation applications
HAC-60 (LMB24-SR-T): this product
✓2–10 VDC modulating: holds last position on power loss
✓BAS resumes control after power event, no abrupt airflow change on interruption
✓Holds-last-position is acceptable: DDC manages recovery
✓Belimo LMB24-SR-T: 45 in-lb [5 Nm] motor torque
HAC-43 (TFB24-SR-T): use instead when…
→Spring return to defined position required on power loss
→Duct must seal completely if power is lost
→Ventilation must be guaranteed regardless of power state
→Spec names TFB24-SR-T or requires spring return
Confirm action code (OPP vs. SPP) with the mechanical engineer or DDC controls designer before ordering. The action code determines the signal-to-blade direction relationship: whether increasing VDC opens or closes the blade must match the BAS control sequence. Confirm with Belimo LMB24-SR-T documentation for the specific configuration required.
Control Input
2–10 VDC analog: proportional
Fail-Safe
Holds last position, no spring return
Actuator
Belimo LMB24-SR-T
Supply Voltage
24 Vac or 24 Vdc
Sizes
6"–20" even inches
End Switch
Not in standard variants: confirm with Hoyme
CSA Status
Not CSA certified
Need spring return fail-safe with modulating control? Use HAC-43 (TFB24-SR-T), same 2–10 VDC proportional control, spring return to defined fail-safe position on power loss. If on/off is sufficient for your application, use HAC-40 (TFB24), less expensive, simpler wiring, spring return included. For 3-wire floating point DDC control see HAC-34 (CMB24-3-T).
2-year electrical · 10-year mechanical warranty
Hoyme damper body: Made in Canada · Belimo LMB24-SR-T field-replaceable through Belimo distributors
Product image is representative only. Actual product may differ in appearance depending on size, configuration, and options selected at order.
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