Installation Instructions

The installation of this appliance must conform with local codes or, in the absence of local codes with the National Fuel Gas Code, ANSI Z223.1.

NOTE: Before the unit is connected to any gas line, check the name plate on the unit for the proper gas type you will be using.

Do not install this appliance in a bedroom or bathroom.

This appliance is equipped with a control valve that has an internal regulator, and is not intended to regulate any gas pressure above ½psig. If using LP gas, a low pressure regulator (not furnished) must be installed in the gas line between the tank and appliance. Do not connect the appliance to the gas line if this regulator is not in place. If using natural gas, check with the gas company to insure that proper gas pressure is available.

GAS PRESSURE: Minimum inlet gas supply pressure must be 5.0” WC for natural gas or 11” WC for LP gas for the purpose of input adjustment. Maximum inlet gas supply pressure must not exceed 10.5” WC for natural gas, or 13” WC for LP gas. The gas line supplying the appliance must be sufficient size to furnish the appropriate supply pressure to the appliance when being operated on the high setting.

+The appliance and its appliance main gas valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of ½ psig (3.5kPa).

+The appliance must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than ½psig (3.5kPa).

+Always keep appliance area clear and free from combustible materials, gasoline and other flammable vapors and liquids.

+Pressure tap screws must be closed before turning on gas to appliance.

HEATER CLEARANCES FROM COMBUSTIBLES:

The minimum clearances to any combustible surface are: 1 inch from the left and right sides, 4 inches from the rear, 24 inches from the front and 24 inches from the top of the heater. The left and right side clearances are measured from the outside edge of the top of the heater. The front clearance is measured from the front of the cabinet and the top measurement is measured from the top of the heater. The rear clearance is measured from the back panel of the heater.

CLEARANCES AROUND AIR OPENINGS:

Do not place any material or store any objects behind the heater. After installation of the heater, do not block the open area behind the heater in any way.

HEATER CLEARANCES FOR SERVICING:

The minimum clearances for servicing the heater are: 18 inches from the right side and 18 inches from the rear of the heater.

This appliance may be installed in an aftermarket permanently located manufactured (mobile) home, where not prohibited by state or local codes.

Aftermarket: Completion of sale, not for the purpose of resale, from the manufacturer.

This appliance is only for use with the type of gas indicated on the rating plate. This appliance is not convertible for use with other gases.

HMDGII, HMDGJ specifications

Heatmaster has established itself as a leader in high-performance outdoor wood-burning furnaces, with the HMDGJ and HMDGII models exemplifying their commitment to quality and innovation. Both units are designed to provide efficient, environmentally friendly heating solutions for residential and commercial applications, each with its unique features and advanced technology.

The HMDGJ model is known for its robust construction and user-friendly design. It features a unique "Dual Feed" system, allowing for the use of various fuels, including wood, pellets, and biomass, providing versatility and convenience for users. This model is equipped with a high-efficiency heat exchanger, which maximizes heat transfer while minimizing emissions, ensuring that more heat reaches your home and less escapes into the atmosphere. The HMDGJ also incorporates a state-of-the-art control system, allowing users to easily adjust settings and monitor performance through a digital display, making it an ideal choice for those who appreciate modern technology.

On the other hand, the HMDGII model boasts enhanced insulation and a larger firebox, which significantly increases the furnace's heating capacity. This model is perfect for larger properties or applications where high heat demand is essential. The HMDGII is designed with a high-temperature rating, allowing it to burn hotter for longer periods, which translates into less frequent refueling and increased efficiency. Similar to the HMDGJ, the HMDGII also features a digital control system that provides real-time data on temperature, fuel levels, and overall efficiency, enabling users to optimize performance effortlessly.

Both models are built with heavy-duty steel construction and are coated with high-temperature paint to resist corrosion and weathering, ensuring longevity and durability in outdoor settings. They also come equipped with user-friendly access doors for easy loading and maintenance.

With the Heatmaster HMDGJ and HMDGII, you can expect superior performance and reliability. Their commitment to efficiency not only reduces fuel usage but also minimizes environmental impact, making these furnaces a responsible choice for conscientious users. Whether for residential heating or larger commercial needs, Heatmaster’s HMDGJ and HMDGII provide innovative solutions that combine technology, efficiency, and ease of use for optimal heating comfort.