The Sterling Shield GF series is a perfect solution for high humidity and corrosive environments such as greenhouses and waste water treatment plants. It is also a great option for the agricultural and food service industries where excess moisture may be found. The GF Series feature a stainless steel cabinet and tubular heat exchanger. A tubular heat exchanger is a curved, non-welded design for more uniform heat transfer. The low-pressure drop associated with this design enables heated air to be evenly distributed to the conditioned space. A tubular heat exchanger is an extremely durable alternative to the traditional welded clamshell design. Stainless steel offers maximum protection against rust and corrosion caused by excess moisture. The heaters in the GF series have an efficiency rating of 83%. The GF Series is NOT certified for residential use.
The GF400A2NS111 is a 400,000 BTU, power vented standard combustion unit. It must be vented to the outside with either horizontal or vertical venting. Either is acceptable and dependent on your installation needs and uses 6" venting (a flue collar is supplied). A venting system is required but is not supplied with the unit and must be purchased separately. The “GF” series is ETL certified in accordance with Categories I and III venting requirements. This certification allows units to be vented both vertically and horizontally using either single wall or double wall venting materials. The louvers on the units are individually adjustable and removable. Once the Shield GF Series heater is installed, you and your employees will experience a warmer, quieter thermostat controlled work environment.
These units utilize a direct spark, pilotless ignition of the burner, providing fast heat delivery. This highly reliable and efficient ignition system incorporates an integrated electronic control board to regulate the system sequence of operation, including an externally mounted LED indicator for simple troubleshooting. Designed with the service person in mind, ignition and fan controls can be found in one centrally located control panel. It offers a single stage combination gas valve and includes a 115/1/60 volt fan motor with internal overload protection.
The unit heater comes standard for Natural Gas usage. An LP gas conversion kit is also available (sold separately). The GF Series has a 115/24V Control Transformer making it usable with 24V thermostats. The 20-gauge steel cabinet of the GF series is crafted to be long-lasting and corrosion resistant. The tubular heat exchanger, constructed of heavy-duty 20-gauge 409 stainless steel, carries a limited 5-year heat exchanger, flue collector and burner warranty.
The heater is set for elevations up to 2,000 feet above sea level. For installation above 2,000 ft, the unit must be field adjusted in accordance with the service manual.