Service Procedures

Removing Control Valve and Burner Tube

1.Shut off gas supply to heater.

2.Remove lower front access panel on heater.

3.Disconnect burner tube from orifice holder (see Figure 18).

4.Remove pilot gas line from control valve (see Figure 18).

5.Disconnect wire connec- tors from thermocouple interrupter (see Figure 18).

6.Remove thermocouple and thermocouple inter- rupter from control valve.

7.Remove cotter pin from control valve. This releases the control rod from valve (see Figure 18).

8.Remove the two mounting screws from control valve mounting bracket (see Figure 18).

9.Remove assembly from the rear of heater. Pull burner tube through hole in combustion chamber.

10.To reinstall, reverse above steps. Turn on gas to heater and check for gas leaks. Apply a mixture of liquid soap and water to all joints. Bubbles forming show a leak. Correct all leaks at once.

11.Replace lower front access panel.

WARNING

Turn off and unplug heater and let cool before servicing. Unless you need gas supply for testing, shut off manual shutoff valve before servicing. Only a qualified service person should service and repair heater and venting system.

Control Rod

Cotter Pin

Control Valve	Control Valve
Bracket

	Mounting
Orifice	Screw
Holder
Burner Tube	Wire Connector
Thermocouple
Interrupter
Thermocouple
	Pilot Gas Line
	Wire Connector

Figure 18 - Removing Control Valve and Burner Tube

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GVC35NA, GVC50NA, GVC65NA specifications

Desa GVC series heaters, including models GVC35NA, GVC65NA, and GVC50NA, are prominent products in the realm of gas-fired heating solutions. These heaters are designed for residential and light commercial applications, providing a reliable heat source with high efficiency.

The GVC35NA has a heating capacity of 35,000 BTU, making it an excellent choice for smaller spaces. It features a compact design, allowing for easy installation in various settings. The advanced vent-free technology incorporated into the GVC35NA enables it to operate without the need for external venting, maximizing efficiency and eliminating heat loss. Additionally, this model includes an oxygen depletion sensor (ODS), which ensures safety by shutting off the unit if oxygen levels drop below a certain threshold.

Moving on to the GVC50NA, this model provides a mid-range heating capacity of 50,000 BTU. This unit is ideal for medium-sized rooms and offers the same vent-free technology as the GVC35NA. The GVC50NA's unique design also enhances airflow, ensuring a consistent and comfortable temperature throughout the space. Like its counterpart, it is equipped with the ODS for added safety, making it suitable for use in bedrooms and other enclosed areas.

The GVC65NA represents the upper end of the GVC series, boasting a robust heating capacity of 65,000 BTU. Designed for larger spaces, it features multiple heat settings, allowing users to customize their heating experience based on specific needs. The unit’s sleek design not only provides aesthetic value but also incorporates a built-in blower option, enhancing air circulation and ensuring even heat distribution. Safety remains a priority with the GVC65NA, which includes an ODS as well as a built-in thermostat for precise temperature control.

All models in the GVC series come equipped with simple control mechanisms, ensuring ease of use. They also utilize glowing ceramic elements for efficient and effective heating. Furthermore, the stylish exterior and compact design of these heaters make them an attractive addition to any room.

In summary, the Desa GVC35NA, GVC65NA, and GVC50NA heaters provide a comprehensive range of heating solutions, combining efficiency, safety, and ease of use. Their vent-free operation, built-in safety features, and aesthetic designs make them ideal choices for a variety of heating needs. Whether for small, medium, or large spaces, there is a GVC model to meet specific requirements, ensuring comfort and warmth for users.