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)
Measure the Damper Size (sq.ft.)
Identify Blade Type (Parallel or Opposed)
Check for Blade Seals
Confirm the Rated Torque per Square Foot
Note Air Velocity or Static Pressure
Choose whether Spring Return is needed
Confirm Voltage Requirements (24V AC/DC, 120V, 230V)
Identify Control Signal Type (On/Off, Modulating, Floating Point)
Assess Shaft Dimensions and Coupling
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
Always double-check voltage and control signals
Use the correct mounting bracket for easy fit
Don’t guess torque—calculate based on damper specs
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