Description
Product image is representative only. Actual product may differ in appearance depending on size, configuration, and options selected at order.
Hoyme inline damper body with Belimo TFB24-SR-T spring return modulating actuator. Proportional blade positioning via 2–10 VDC analog signal — the blade tracks the signal continuously from minimum to fully open. Spring return on power loss moves the blade to the fail-safe position. For BAS and DDC analog output control. Sizes 6"–20" in even-inch increments.
Confirm action code with the mechanical engineer or DDC controls designer before ordering. The action code determines both the fail-safe direction on power loss and the signal-to-blade relationship — whether increasing voltage opens or closes the blade. The wrong action code means the blade modulates in the reverse direction relative to the control signal. This cannot be corrected after installation.
✓ 2–10 VDC proportional blade positioning — blade tracks the analog signal continuously; 2 VDC = minimum position, 10 VDC = fully open, every point in between proportional
✓ Spring return fail-safe — on power loss the blade moves to the action-code position regardless of where it was in the modulating range; defined fail-safe on every power interruption
✓ Belimo TFB24-SR-T — factory-mounted to Hoyme damper body — single SKU, ready to install; actuator field-replaceable through Belimo distributors without disturbing duct connections
✓ 24 Vac or 24 Vdc supply — either polarity on DC; suitable for BAS systems with 24 Vdc control power
✓ End switch available — optional position confirmation signal back to BAS digital input; no relay, no heat bypass on modulating actuator
✓ Need to hold last position on power loss instead? — see HAC-60 (LMB24-SR-T) — same 2–10 VDC modulating control, no spring return
| Signal (VDC) | Approximate Blade Position |
|---|---|
| 2.0 VDC | Minimum position — closed or minimum open per action code |
| 4.0 VDC | 25% open |
| 6.0 VDC | 50% open |
| 8.0 VDC | 75% open |
| 10.0 VDC | Fully open |
| If your application needs… | Product | Actuator |
|---|---|---|
| Proportional 0–100% via 2–10 VDC — spring return fail-safe | HAC-43 | TFB24-SR-T — this product |
| Proportional 0–100% via 2–10 VDC — holds last position on power loss | HAC-60 | LMB24-SR-T |
| On/off spring return gate — 2-position, 24 Vac/dc | HAC-40 | TFB24 |
| 3-wire open/stop/close DDC floating point | HAC-34 | CMB24-3-T |
| On/off spring return — 100–240 Vac line voltage | HAC-44 | TFB120 |
| UL 555S fire and smoke rated, 24 Vac | HAC-90 | FSLF24 US |
Control Input
2–10 VDC analog — proportional
Actuator
Belimo TFB24-SR-T
Supply Voltage
24 Vac or 24 Vdc
Fail-Safe
Spring return — OPO or OPC
Sizes
6"–20" even inches
Action Code
Confirm with engineer before ordering
Heat Bypass
Not available on modulating
CSA Status
Confirm with Hoyme before ordering
On/off sufficient for your application? If the damper just needs to be open when ventilation is called and closed when it isn't — no proportional positioning required — use the HAC-40 (TFB24 on/off). It's less expensive, the control circuit is simpler, and the commissioning is straightforward. Modulating control is required only when the application strategy demands proportional blade positioning: demand-controlled ventilation, mixed air temperature control, building pressure management, or VAV fresh air tracking.
2-year electrical · 10-year mechanical warranty
Hoyme damper body — Made in Canada · Belimo TFB24-SR-T field-replaceable through Belimo distributors