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 LMX120-3 line-voltage floating point actuator. Same Open / Stop / Close 3-wire architecture as the rest of the floating point family. Two constraints distinguish it from the HAC-35 (CMB120-3): Power Open configuration only — Power Close is not available on the LMX120-3 — and lower torque class. When the spec names LMX120-3 and PO is confirmed, this is the product. Sizes 6"–20".
Power Open only. The LMX120-3 is not available in Power Close configuration. If Power Close action is required at line voltage, use HAC-35 (CMB120-3) — same line-voltage floating point architecture, PO and PC both available.
No spring return — holds last position on power loss. The blade stays at its last position if power is lost. If a defined fail-safe position is required on power loss, use HAC-44 (TFB120) — line-voltage on/off with spring return.
✓ 3-wire floating point at line voltage — Open / Stop / Close — DDC controller pulses the Open or Close wire to position the blade incrementally at 100–230 Vac; no transformer, no low-voltage run to the damper
✓ LMX120-3 — lighter torque class than CMB120-3 — suited to smaller and mid-range duct sizes at moderate static pressure; if torque adequacy is uncertain, specify HAC-35 (CMB120-3)
✓ Belimo LMX120-3 — 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 LMX120-3 motor code
HAC-70 (LMX120-3) — this product
✓Power Open is confirmed — PC is not required
✓Spec names LMX120-3 or is actuator-neutral
✓Smaller or mid-range duct sizes at moderate static pressure
✓Lower torque class confirmed adequate for the application
HAC-35 (CMB120-3) — use instead when…
→Power Close action is required at line voltage
→Spec names CMB120-3 specifically
→Larger duct sizes or higher static pressure
→Torque adequacy of LMX is uncertain — CMB is the safer choice
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.
| Application at line voltage | Control type | Product |
|---|---|---|
| On/off, spring return, PO or PC | On/Off spring return | HAC-44 (TFB120) |
| Floating point, PO only, lower torque | Floating point, PO only | HAC-70 (LMX120-3) — this product |
| Floating point, PO or PC, higher torque | Floating point, PO or PC | HAC-35 (CMB120-3) |
| Fire and smoke UL 555S, 120 Vac | Spring return fire/smoke | HAC-80 (FSLF120 US) |
Actuator
Belimo LMX120-3 — 100–230 Vac
Action
Power Open only — no PC
Fail-Safe
Holds last position — no spring return
Control
3-wire floating point
Sizes
6"–20" even inches
Torque
Lower class — confirm for size and pressure
CSA Status
Confirm with Hoyme before ordering
Need Power Close at line voltage? Use HAC-35 (CMB120-3) — same line-voltage floating point architecture, PO and PC both available, higher torque class. For line-voltage on/off with spring return see HAC-44 (TFB120). For 24 Vac floating point see HAC-34 or HAC-30.
2-year electrical · 10-year mechanical warranty
Hoyme damper body — Made in Canada · Belimo LMX120-3 field-replaceable through Belimo distributors