Description
Hoyme inline damper body with Belimo CMB120-3 line-voltage floating point actuator. Same 3-wire Open / Stop / Close control architecture as the HAC-34 (CMB24-3-T). Same holds-last-position behavior on power loss. One difference: the CMB120-3 accepts 100–230 Vac directly, so no step-down transformer or low-voltage circuit is required at the damper location. Sizes 6"–20" in even-inch increments.
⚠ No Spring Return: Holds Last Position on Power Loss
On power loss, the HAC-35 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, use a spring return product: HAC-44 (TFB120) for line-voltage on/off with spring return.
✓ CMB120-3, 100–230 Vac direct. Accepts North American 120 Vac, 208/240 Vac, and international line voltage; no transformer, no low-voltage run to the damper
✓ Same 3-wire floating point as HAC-34: Open / Stop / Close; DDC controller pulses the Open or Close wire to position the blade incrementally; blade holds when neither is active
✓ 18 in-lb [2 Nm] motor torque, same as CMB24-3-T. Suited to the same applications as the HAC-34; for more torque at line voltage see the 45 in-lb LMX120-3 (HAC-70)
✓ Belimo CMB120-3: factory-mounted to Hoyme damper body. Single SKU, ready to install; actuator field-replaceable through Belimo distributors
✓ End switch and heat bypass (-H) available on all sizes: factory-installed; no relay on CMB120-3 motor code
HAC-35 (CMB120-3): this product
✓Only line voltage (100–230 Vac) available at the damper location
✓DDC floating point output card operates at line voltage
✓Adding a step-down transformer to the damper location is impractical
✓Spec names CMB120-3 specifically
HAC-34 (CMB24-3-T): use instead when…
→24 Vac is already available at the damper location
→DDC floating point output card operates at 24 Vac/dc
→Simpler wiring: low-voltage circuit avoids running line voltage to the actuator
→Spec names CMB24-3-T specifically
Do not specify -H heat bypass on fresh air intake, make-up air, or ventilation applications. The 10% bypass allows continuous outdoor air infiltration when the damper is at minimum position. Specify -H only for hot air supply duct zone control on single-speed furnace systems.
| Actuator | Voltage | Torque | Product |
|---|---|---|---|
| LMB24-3-T | 24 Vac/dc | 45 in-lb | HAC-30 |
| CMB24-3-T | 24 Vac/dc | 18 in-lb | HAC-34 |
| CMB120-3 | 100–230 Vac | 18 in-lb | HAC-35: this product |
| LMX120-3 | 100–230 Vac (PO only) | 45 in-lb | HAC-70 |
Actuator
Belimo CMB120-3, 100–230 Vac
Fail-Safe
Holds last position, no spring return
Control
3-wire floating point
Sizes
6"–20" even inches
Heat Bypass (-H)
Available all sizes: hot air zone only
CSA Status
Not CSA certified
Need spring return fail-safe at line voltage? The HAC-35 holds last position on power loss. For line-voltage on/off with spring return see HAC-44 (TFB120). For 24 Vac floating point see HAC-34 (CMB24-3-T) or HAC-30 (LMB24-3-T). For line-voltage floating point with higher torque (45 in-lb, PO only) see HAC-70 (LMX120-3).
2-year electrical · 10-year mechanical warranty
Hoyme damper body: Made in Canada · Belimo CMB120-3 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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