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J20741 - Subject to change. © Belimo Aircontrols (USA), Inc.
Installation and Operation
Non-Spring Return
General Information
If more torque is required than one GM can provide, GM24B, GMB24-SR or GMX24-MFT may be installed on the same shaft.
Multiple Actuator Mounting
Preliminary Steps
1. Belimo actuators with NEMA 1 or NEMA 2 ratings should
be mounted indoors in a dry, relatively clean environment
free from corrosive fumes. If the actuator is mounted out-
doors, a protective enclosure must be used to shield the
actuator.
2. For new construction work, order dampers with extended
shafts. Instruct the installing contractor to allow space for
mounting the Belimo actuator on the shaft.
For replacement of existing gear train actuators, there are two
options:
A. From a performance standpoint, it is best to mount the
actuator directly onto the damper shaft.
B. If the damper shaft is not accessible, mount the non-
spring return actuator with a ZG-NMA or ZG-GMA
crankarm kit, and a mounting bracket (ZG-100, ZG-
101, ZG-103, ZG-104)
Torque Loading
Chart
Determining Torque Loading and Actuator Sizing
Damper torque loadings, used in selecting the correct size actua-
tor, should be provided by the damper manufacturer. If this
information is not available, the following general selection
guidelines can be used.
Damper Type Torque Loading
Opposed blade, without edge seals, 3 in-lb/sq. ft.
for non-tight close-off applications
Parallel blade, without edge seals, 4 in-lb/sq. ft.
for non-tight close-off applications
Opposed blade, with edge seals, 5 in-lb/sq. ft.
for tight close-off applications
Parallel blade, with edge seals, 7 in-lb/sq. ft.
for tight close-off applications
The above torque loadings will work for most applications under
2 in. w.g. static pressure or 1000 FPM face velocity. For appli-
cations between this criteria and 3 in. w.g. or 2500 FPM, the
torque loading should be increased by a multiplier of 1.5. If the
application calls for higher criteria up to 4 in. w.g. or 3000 FPM,
use a multiplier of 2.0.
Table of Contents Page
General Mounting
❑ Standard ............................................266
❑ Reversible Clamp ..............................267
❑ Linear..................................................268
❑ Rotary ................................................269
❑ Retrofit Brackets ................................271
Operation
❑ Electrical ..............................................272
❑ Mechanical ..........................................273
Wiring
❑ General ..............................................274
❑ Accessories ........................................275
Startup and Checkout..................................278
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