OMH Models and Specifications
The OMH is a single model line: a ½ HP, 115 V single-phase jackshaft operator. It mounts directly on the torsion shaft beside the spring, leaving the ceiling clear for ductwork, racks or mezzanine edges. The motor drives the shaft through a chain-and-sprocket reduction , mechanically simpler than a trolley rail and less exposed to dust.
| Spec | Detail |
|---|---|
| Motor | ½ HP, 115 V single-phase |
| Max door size | 18 ft × 18 ft, standard lift |
| Duty cycle | 12 cycles/hour, 50 cycles/day |
| Manual operation | Hoist-a-Matic chain (powered, engaged) |
| Drive | Chain-and-sprocket to torsion shaft |
Where the OMH Fits , And Where It Doesn't
The OMH is built for standard commercial sectional doors up to 18×18 ft on standard-lift track. It suits strata parkade entries, auto repair bays, and light industrial units where ceiling space is occupied and only 115 V power is available at the door.
It is not the right choice for doors larger than 18×18 ft, high-traffic loading docks cycling every few minutes, or heavy insulated doors with wind-load struts and reinforced hardware. Those applications need a higher-horsepower, often three-phase operator such as the Manaras OHM or a comparable LiftMaster commercial unit.
Common Failures and How We Repair Them
- Limit switch drift: Vibration shifts the cam positions over time, causing the door to stop short or over-travel. We recalibrate the limits and secure the cam assembly.
- Chain-and-sprocket wear: The reduction chain stretches and sprockets wear, especially in dusty environments. We replace the chain, inspect sprockets, and re-tension.
- Hoist-a-Matic mechanism binding: The manual chain can seize if not exercised. We clean, lubricate and verify free operation so the door can be raised by hand during a power outage.
- Capacitor or motor start failure: Single-phase motors rely on a start capacitor. We test and replace it on site; if the motor windings are damaged, we swap the motor module.
- Wiring and control issues: Loose low-voltage wires at the push-button station or photo-eyes cause intermittent operation. We trace and re-terminate every connection.
Because we stock Manaras parts, most OMH repairs are completed in a single visit across Vancouver, Richmond, Burnaby, Surrey and the North Shore.
Choosing Between the OMH and Other Operators
If your door is 18×18 ft or smaller, runs on standard-lift track, cycles fewer than 50 times a day, and you have only 115 V at the jamb, the OMH is the logical fit. If any of those limits are exceeded , larger door, high-lift or vertical-lift track, heavier construction, or higher cycle demand , step up to a higher-horsepower model. We assess the door, track geometry and traffic pattern on site and quote per project.
Parts and Accessories We Stock
- Replacement limit switch assemblies and cams
- Chain-and-sprocket kits for the reduction drive
- Hoist-a-Matic chain and guide components
- Start/run capacitors and motor modules
- Low-voltage control stations, photo-eyes and safety edges
Service and Installation Across Metro Vancouver
Up and Down Garage Doors is your local authorized Manaras dealer. We handle new OMH installations, scheduled maintenance, and emergency repairs from our Richmond shop. Our technicians know the OMH platform inside out , because we install it and we fix it.
Call 778-873-7282 for a site assessment, a quoted price, or same-day service anywhere in Metro Vancouver.
Commercial garage door repair | Operator pricing guide | Broken spring repair