Product Configuration – Nautilair Family

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Application Information

Nautilair variable speed brushless DC blowers have been engineered to deliver a measured air/fuel mixture in gas-fired burner systems for optimized combustion and reduced nitrous oxide and carbon monoxide emissions.

Mechanical Characteristics

Nautilair blowers are designed for combustion applications and are typically mounted directly to the inlet of the burner. The fan housings are sealed to allow for the combustion gas and air to mix inside the blower. Fans have been designed to optimize air/gas mixtures and provide high efficiency combustion.

Their design uses an offset motor that allows for higher temperatures and condensation in the fan housing without effecting the blower PC board.

There are three sizes of blowers: 7.6", 8.9" and 12.3". We have a Standard and High Output version of each blower and we will customize the blower to meet your needs.

Electrical Characteristics

The motor controller uses a digital signal processor (DSP) drive to control the speed of the blower. It is completely programmable for various speed profiles and several different speed signals (0-10VDC, PWM, 4-20mA, and mechanical).

Nautilair blowers have an optional internal speed control circuit that will maintain a specific speed regardless of load or supply voltage. This allows for a constant speed in areas of fluctuating supply voltages or varying pressures.

AMETEK blowers have the ability to accept Universal Voltages. One benefit of this option is the ability to use the same blower in applications installed anywhere in the world, without the need of a transformer. The Common Performance option standardizes the performance so that the blower output is the same while being run at any input voltage. In the case of voltage spikes, or the system being installed in a different location, the air performance remains constant.

Nautilair Proformance

There are a wide variety of options available as part of the Nautilair lineup. These options make it possible to configure your Nautilair blower to fit seamlessly into your application.

1. Sizing Based on Performance Requirement

The chart shown at the bottom of previous page can be used to identify the proper Nautilair family required based on the output of your application (BTU). Depending on the system resistance (pressure drop) of your system it may be possible that multiple blower models may be suitable.

2. Determine Outlet Flange Size

Nautilair blowers have been optimized to fi t into many standard combustion applications. Outlet flange options allow for the blower to bolt up to each specific application with minimal modification of the system.


3. Determine Input Voltage and Control

Options for input voltage as well as control types makes the Nautilair lineup of blowers adaptable to a wide variety of applications. Depending on the application, the blower can be confi gured for open or closed loop control. In closed loop control, a specifi c speed control command, say 5vdc, is correlated to a specifi c blower speed, say 8,000 RPM. If the system resistance (pressure) changes the speed will be maintained. Open loop allows for the speed to vary according to the system resistance.

Input Voltages      Speed Control Inputs Speed Control Options
120 VAC    Mechanical Potentiometer   Open Loop
230/240 VAC 1 Phase   0-10 VDC  Closed Loop
230/240 VAC 3 Phase PWM
380-575 VAC 3 Phase 4-20 mA


4.Determine Inlet / Gas Valve Mounting 

All Nautilair blowers are designed to accept several different gas valves that attach directly to the inlet of the blowers of Honeywell, Karl Dungs, SCC and Kromshroder. Your AMETEK sales representative can help you to determine the suitable inlet configuration to match the gas valve being used. Unique bolt patterns, tapped holes, O-ring grooves, and gasket locating features are only a few of the options available.




Information provided by Ametek DFS

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