All installations and services must be performed by qualified service personnel.

BTU at sea level must be reduced to a firing rate of 64,000 (80,000 x .80 = 64,000) at an elevation of 5,000 feet. If the furnace is installed at an elevation of 2,000 feet or less, no reduction in input is required. Your gas supplier may supply you with the correct orifice sizing information.

To check the heat input rate of your natural gas furnace, allow the unit to operate for 10 to 15 minutes and proceed as follows:

a. Call your gas supplier and ask for the BTU content (heating value) of one cubic foot of the gas, supplied to the installation area. An alternate approach is to assume a value of 1025 BTU/Cu Ft, which is the national average.

b. With all other gas appliances turned off and using a stopwatch, clock the time required for the (small) dial on the gas meter to make one full revolution. The meter dial will state the cubic feet of flow for one revolution usually one, two or five.

FORMULA: BTU/Cu Ft x Number of Cu Ft x 3600 Seconds = Input BTU/hr Seconds for one revolution

EXAMPLE: 1025 BTU/Cu Ft x 2 Cu Ft x 3600 = 78,678 BTU Input 93.80 Seconds

Check the model number of the furnace, the input rate, the type of gas, and the manifold pressure on the rating label located in the burner vestibule. If using the above example, the furnace is a GMD1-80N model and the input rate is 78,678 BTU/hr. The input rate would be acceptable because it was within + 2% of the listed input of 80,000.

c. Make sure that the gas supply pressure to the furnace is within the allowable range of 5.5" to 14" WC pressure on natural gas and 11.0" to 14.0" WC on propane gas. The pressure to the furnace must be checked while the furnace burner and any other gas appliances on the same supply system are operating, using the 1/8 in. NPT manifold pressure tap shown in figure 8.

GAS PRESSURE CHART FOR ALL GMD1-60 and GMD1-80 MODEL FURNACES

 

SUPPLY PRESSURE

MANIFOLD PRESSURE

 

 

 

NAT

MAX 14” WC

3.5 + .3” WC

MIN 5.5” WC

 

 

PROPANE

MAX 14” WC

10.0” + .3” WC

MIN 11” WC

 

 

 

 

 

 

TABLE 2

 

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Thermo Products GMD1-60N, GDM1-80N service manual Supply Pressure Manifold Pressure NAT
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GMD1-60N, GDM1-80N specifications

Thermo Products has established itself as a leader in the manufacturing of high-performance heating solutions. Among their notable offerings are the GDM1-80N and GMD1-60N units, which have garnered attention for their innovative features and reliable performance.

The GDM1-80N is designed for applications that require robust heating capabilities. This model boasts an impressive output capacity, making it suitable for industrial and commercial settings. One of its key features is the advanced temperature control system that ensures consistent heating across various environments. This system utilizes precision sensors that monitor temperature in real-time, allowing for adjustments to maintain the desired levels effectively.

Another notable characteristic of the GDM1-80N is its energy efficiency. It is engineered with state-of-the-art technology that minimizes energy consumption while maximizing heat output. This is particularly beneficial for businesses looking to reduce operational costs while still maintaining high-performance heating.

In contrast, the GMD1-60N is tailored for slightly less demanding applications but still delivers exceptional performance. With a compact design, it is ideal for spaces where floor space is limited without compromising on heating efficiency. The GMD1-60N features a user-friendly control interface, allowing operators to easily set and monitor temperatures.

Both models incorporate durable construction materials, ensuring longevity and reliability in various working conditions. The robust design means they can withstand the rigors of industrial use while providing consistent performance over time. Additionally, they are equipped with safety features, including overheat protection and user-accessible maintenance points, which enhance their usability and safety.

Thermo Products has integrated smart technology into these units, with options for remote monitoring and management through IoT devices. This capability allows users to track energy usage and system performance, facilitating better decision-making regarding heating needs and maintenance schedules.

In conclusion, the Thermo Products GDM1-80N and GMD1-60N units represent advanced heating solutions that cater to a range of industrial and commercial applications. With their emphasis on energy efficiency, durability, and smart technology, these models stand out as reliable choices for those seeking effective heating solutions in their operations.
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