a.Where directly communicating with the out- doors or where communicating to the outdoors through vertical ducts, each opening shall have a minimum free area of 1 in.2 per 4000 BTUH (5.5 cm2 per kW) of total input rat- ing of all equipment in the enclosure.

b.Where communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 in.2 per 2000 BTUH (11 cm2 per kW) of total input rating of all equipment in the enclosure.

2.One permanent opening, commencing within 12 in. (30 cm) of the top of the enclosure, shall be permitted where the equipment has clearances of at least 1 in. (2.5 cm) from the sides and back and 6 in. (16 cm) from the front of the appliance. The opening shall directly communicate with the out- doors or shall communicate through a vertical or horizontal duct to the outdoors or spaces (crawl or attic) that freely communicate with the outdoors, and shall have a minimum free area of:

a.1 in.2 per 3000 BTUH (7 cm2 per kW) of the total input rating of all equipment located in the enclosure, and

b.Not less than the sum of the areas of all vent connectors in the confined space.

WARNING: Do not use one permanent opening method if the equipment room is under negative pressure conditions or the equipment is common vented with other gas-fired appliances.

Installations in Canada

CAUTION: All combustion air must be drawn from the air outside of the building; the mechanical equipment room must communicate directly with the outdoors.

1.Ventilation of the space occupied by the heater shall be provided by an opening(s) for ventilation air at the highest practical point communicating with outdoors. The total cross-sectional area of such an opening(s) shall be at least 10% of the area required in (2) and (3), but in no case shall the cross-sectional area be less than 10 in.2 (6500 mm2.).

2.For heaters using a barometric damper in the vent system, and when air supply is provided by natu-

ral air flow from the outdoors for natural draft, par- tial fan assisted, fan-assisted or power draft-assisted burners, there shall be a permanent air supply opening(s) having a cross section area of not less than 1 in.2 per 7000 BTUH (310 mm2 per kW) up to and including 1 million BTUH, plus 1 in.2 per 14000 BTUH (155 mm2 per kW) in excess of 1 million BTUH. This opening(s) shall be either located at or ducted to a point not more than 18 in. (450 mm) nor less than 6 in. (150 mm) above the floor level. The duct can also "Goose Neck" through the roof. The duct is preferred straight down 18” from floor, but do not place near piping. This air supply opening requirement shall be in addition to the air opening for ventilation air required in (1).

3.For heaters not using a barometric damper in the vent system, and when air supply is provided by natural air flow from outdoors for a power burner and there is no draft regulator, drafthood or similar flue gas dilution device installed in the same space, in addition to the opening for ventilation air required in (1), there shall be a permanent air sup- ply opening(s) having a total cross-sectional area of not less than 1 in.2 for each 30,000 BTUH (70 mm2 per kW) of total rated input of the burner(s), and the location of the opening(s) shall not inter- fere with the intended purpose of the opening(s) for ventilation air referred to (1). This opening(s) can be ducted to a point not more than 18 in. (450 mm) nor less than 6 in. (150 mm) above the floor level. The duct can also "Goose Neck" through the roof. The duct is preferred to be straight down 18” from floor, but do not place near piping.

4.Refer to the latest version of the B149 for addition- al information.

Water Piping

General

The heater should be located so that any water leaks will not cause damage to the adjacent area or struc- tures.

CAUTION: This heater requires forced water circulation when the burner is operating. See Table E and Table F for minimum and maximum flow rates and water pump selection. The pump must be interlocked with the heater to prevent heater operation without water circulation.

12

Page 11 Page 13
Page 12
Image 12
Raypak HD401, HD101 operating instructions Water Piping, Installations in Canada, General
Page 11 Page 13

HD101, HD401 specifications

Raypak is renowned for its commitment to high-quality heating solutions, with the HD101 and HD401 models standing out in their product range. These units are designed specifically for commercial applications, providing reliable and efficient hydronic heating systems. The HD series embodies innovation while addressing the unique demands of larger spaces.

One of the main features of the HD101 and HD401 is their stainless steel construction, which ensures increased durability and resistance to corrosion. This design choice enhances the longevity of the units, making them ideal for various installations in commercial or industrial settings.

Both models are equipped with a high-efficiency heat exchanger that maximizes heat transfer while minimizing energy consumption. This feature is particularly significant in today’s environmentally conscious market, as it contributes to lower operating costs and reduced carbon footprints. The heat exchangers are engineered for easy maintenance, offering simplicity when service is required.

In terms of technology, the HD101 and HD401 include advanced digital controls that allow for precise temperature regulation. This user-friendly interface enables operators to easily manage and monitor heating parameters, facilitating optimal performance and energy management.

The models also feature modulating burners that adjust their output according to the heating demand. This capacity for modulation results in smoother operation and an overall increase in efficiency, as the burners can maintain consistent temperatures without excessive energy use.

Another noteworthy characteristic is their compatibility with various control systems, including BMS (Building Management Systems). This adaptability allows for seamless integration into existing infrastructure, providing users with greater versatility and control over their heating environments.

Both the HD101 and HD401 come with advanced safety features, including flame rollback protection and pressure monitoring, ensuring safe operation even in demanding conditions. Additionally, their compact design allows for easy installation in limited spaces while still providing powerful heating capabilities.

Ultimately, the Raypak HD101 and HD401 are exceptional choices for those in need of high-efficiency commercial heating solutions. With their robust construction, advanced technology, and user-friendly features, these models promise to deliver reliable performance and energy savings for years to come. Whether for a large facility or a specific industrial application, they stand ready to meet the heating challenges of today’s commercial landscape.
Top Page Image Contents