Why Use Belimo Retrofit Actuators?
Replacing legacy or discontinued actuators in HVAC systems can be complicated due to mounting differences, torque mismatches, and signal variations. Belimo offers a retrofit solution that simplifies this process by providing universal mounting kits, adjustable shaft clamps, and wide voltage ranges, making it easy to upgrade existing systems with minimal downtime.
🔟 Step Selection Process (as per Belimo guide)
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Measure the Damper Size (sq.ft.)
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Identify Blade Type (Parallel or Opposed)
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Check for Blade Seals
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Confirm the Rated Torque per Square Foot
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Note Air Velocity or Static Pressure
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Choose whether Spring Return is needed
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Confirm Voltage Requirements (24V AC/DC, 120V, 230V)
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Identify Control Signal Type (On/Off, Modulating, Floating Point)
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Assess Shaft Dimensions and Coupling
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List any Accessories or Linkages required
🧮 Example:
A 24″ x 24″ opposed-blade damper with seals and 5 in-lbs/sq.ft torque =
4 sq.ft × 5 = 20 in-lbs torque → Use LF24 or LF24-SR actuator.
Belimo Retrofit Cross Reference Examples
| Brand | Model No. | Belimo Retrofit | Notes |
|---|---|---|---|
| Honeywell | ML6161A2009 | LMB24-SR | 24V, modulating, spring return |
| Siemens | GCA126.1P | GMB24-MFT | 24V, programmable, non-spring |
| Johnson | M9106-GGA-2 | NM24A-SR | 24V, floating, spring return |
| Invensys | M7410A2001 | LF24-SR | 24V, 2–10 VDC, spring return |
Brackets & Mounting Kits
Belimo provides universal mounting brackets for each actuator series (e.g., KH6, KH7, ZG series) to simplify installation.
| Kit Code | Compatible Series | Application |
|---|---|---|
| KH6 | LF, NF | Parallel damper blades |
| KH8 | GM, AM, NM | Opposed blades |
| ZG-100 | All series | Shaft mounting accessories |
Common Actuator Series & Features
| Series | Torque Range | Control Type | Spring Return | Notes |
|---|---|---|---|---|
| LF | 35 in-lbs | On/Off, Mod | Yes | Compact, for small dampers |
| NM | 90 in-lbs | Mod/Floating | No | For mid-size dampers |
| GM | 180 in-lbs | Mod/Floating | Optional | For larger dampers |
Download the Full Belimo Retrofit PDF
🔗 Download Belimo Retrofit Guide PDF
Where to Buy
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Final Tips
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Always double-check voltage and control signals
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Use the correct mounting bracket for easy fit
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Don’t guess torque—calculate based on damper specs
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