AIR for Combustion Ventilation | Desa FVF18P, FVF30P, FVF24P

OWNER’S MANUAL

AIR FOR

COMBUSTION AND

VENTILATION

Continued

DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION

Determining if You Have a Confined or Unconfined Space

Use this work sheet to determine if you have a confined or unconfined space.

Space: Includes the room in which you will install heater plus any adjoining rooms with doorless passageways or ventilation grills between the rooms.

1.Determine the volume of the space (length x width x height).

Length x Width x Height = ___________________ cu. ft. (volume of space)

Example: Space size 20 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) = 2560 cu. ft. (volume of space)

If additional ventilation to adjoining room is supplied with grills or openings, add the volume of these rooms to the total volume of the space.

2.Divide the space volume by 50 cubic feet to determine the maximum Btu/Hr the space can support.

_______________ (volume of space) ÷ 50 cu. ft. = (maximum Btu/Hr the space can support)

Example: 2560 cu. ft. (volume of space) ÷ 50 cu. ft. = 51.2 or 51,200 (maximum Btu/Hr the space can support)

3.Add the Btu/Hr of all fuel burning appliances in the space.

Vent-free heater		_____________	Btu/Hr
Gas water heater*		_____________	Btu/Hr
Gas furnace		_____________	Btu/Hr
Vented gas heater		_____________	Btu/Hr
Gas fireplace logs	+	_____________	Btu/Hr
Other gas appliances*	+	_____________	Btu/Hr
Total	=	_____________	Btu/Hr

Example:
Gas water heater	+	40,000	Btu/Hr
Vent-free heater	+	31,500	Btu/Hr
Total	=	71,500	Btu/Hr

*Do not include direct-vent gas appliances. Direct-vent draws combustion air from the outdoors and vents to the outdoors.

4.Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr used.

_________________ Btu/Hr (maximum the space can support)

_________________ Btu/Hr (actual amount of Btu/Hr used)

Example: 51,200 Btu/Hr (maximum the space can support)

71,500 Btu/Hr (actual amount of Btu/Hr used)

The space in the above example is a confined space because the actual Btu/Hr used is more than the maximum Btu/Hr the space can support. You must provide additional fresh air. Your options are as follows:

A.Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconfined space, remove door to adjoin- ing room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 6.

B.Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 6.

C.Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconfined.

If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an unconfined space. You will need no additional fresh air ventilation.

WARNING: If the area in which the heater may be operated is smaller than that defined as an unconfined space, or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of the methods described in the National Fuel Gas Code, ANS Z223.1, 1992, Section 5.3 or applicable local codes.

Continued

105192

FVF30P, FVF18P, FVF24P specifications

Desa FVF24P, FVF18P, and FVF30P are innovative products in the heating and ventilation sector, designed to meet diverse customer needs while optimizing performance. Each model has unique features and technologies that cater to various applications whether residential, commercial, or industrial.

Starting with the FVF24P, this model is renowned for its high efficiency and compact design. It is equipped with advanced modulation technology which allows the unit to adjust its output based on real-time demand. This results in reduced energy consumption and lower operating costs. The FVF24P also boasts an integrated smart control system that enables users to monitor and manage settings remotely via smartphone applications. This feature not only enhances convenience but also maximizes comfort by ensuring optimal temperature levels at all times.

Moving on to the FVF18P, this model is specifically engineered for smaller spaces or apartments where heating efficiency is paramount without compromising on space. It incorporates a unique heat exchanger that significantly increases heat transfer efficiency. Additionally, the FVF18P features a quiet operation mode, making it suitable for bedrooms or any noise-sensitive environments. Its compact size does not detract from its performance, as it offers a balanced air distribution system ensuring every corner receives adequate warmth.

The FVF30P, on the other hand, is a powerhouse designed for larger areas requiring robust heating capabilities. It supports a wider range of airflow settings and has an impressive BTU rating, making it ideal for vast commercial spaces or industrial applications. The inclusion of multiple safety features, such as overheat protection and automatic shut-off, underscores its design philosophy focused on user safety and reliability. Furthermore, the FVF30P is built to work with renewable energy sources, aligning with modern sustainability goals and reducing the environmental impact associated with traditional heating solutions.

In summary, the Desa FVF series presents a range of efficient heating solutions with the FVF24P, FVF18P, and FVF30P models catering to different power requirements and space constraints. With advanced technologies such as smart controls, enhanced heat exchangers, and safety features, these models are a testament to Desa’s commitment to quality, efficiency, and customer satisfaction in the heating market.

Desa FVF18P AIR for Combustion Ventilation, Determining FRESH-AIR Flow for Heater Location

Models: FVF30P FVF18P FVF24P