Raypak HI DALTA HD101 User Manual download pdf (Page 11)

area per 20,000 BTUH (111 mm

per kW) of total

input rating of all equipment in the room when the

opening is communicating directly with the out-

doors or through vertical duct(s). The total

cross-sectional area shall be at least 1 in.

of free

area per 10,000 BTUH (222 mm

per kW) of total

input rating of all equipment in the room when the

opening is communicating with the outdoors

through horizontal duct(s).

3. In cold climates, and to mitigate potential freeze-

up, Raypak highly recommends the installation of

a motorized sealed damper to prevent the circula-

tion of cold air through the heater during

non-operating hours.

Conventional Combustion Air

Supply

U.S. Installations

All Air from Inside the Building

The confined space shall be provided with TWO per-

manent openings communicating directly with an

additional room(s) of sufficient volume so that the com-

bined volume of all spaces meets the criteria for an

unconfined space. The total input of all gas utilization

equipment installed in the combined space shall be

considered in making this determination. Each open-

ing shall have a minimum free area of 1 in.

per 1,000

BTUH (22 cm² per kW) of the total input rating of all

gas utilization equipment in the confined space, but

not less than 100 in.² (645 cm²). One opening shall

commence within 6-3/4 in. of the top, and one opening

shall commence within 6-3/4 in. of the bottom, of the

enclosure. The minimum dimension of air openings

shall be not less than 3 in. (8 cm) in any direction.

All Air from Outdoors

The confined space shall communicate with the out-

doors in accordance with methods 1 or 2 below. The

minimum dimension of air openings shall not be less

than 3 in. (8 cm) in any direction. Where ducts are

used, they shall be of the same cross-sectional area

as the free area of the openings to which they connect.

1. Two permanent openings, one commencing

within 12 in. (30 cm) of the top, and one commenc-

ing within 12 in. (30 cm) of the bottom, of the

enclosure shall be provided. The openings shall

communicate directly, or by ducts, with the out-

doors or spaces (crawl or attic) that freely

communicate with the outdoors.

Combustion and Ventilation Air

Combustion Air Filter

This heater is supplied with an integral combustion air

filter. This filter will reduce the amount of particulates

passed through the combustion system and heat

exchanger but will not protect against chemical inside

air contamination (See Appendix). The filter must be

checked periodically to verify that adequate combus-

tion air is being supplied to the heater. See the

Maintenance section of this manual for information on

checking the filter and establishing service intervals.

Indoor Units

The heater must be supplied with sufficient quantities

of non-contaminated air to support proper combustion

and equipment ventilation. Combustion air can be sup-

plied via conventional means where combustion air is

drawn from the area immediately surrounding the

heater, or via direct vent, where combustion air is

drawn directly from outside. All installations must com-

ply with the requirements of the NFGC (U.S.) and

B149 (Canada), and all local codes.

Direct Combustion Air

If outside air is drawn through the intake pipe directly

to the unit for combustion:

1. Install combustion air direct vent in accordance

with the venting section of this manual.

2. Provide adequate ventilation of the space occu-

pied by the heater(s) by an opening(s) for

ventilation air at the highest practical point com-

municating with the outdoors. The total

cross-sectional area shall be at least 1 in.

of free

CAUTION: Combustion air must not be

contaminated by corrosive chemical fumes which

can damage the heater and void the warranty. (See

the Appendix.)

These clearances are required when the outdoor

vent cap is used. If installing the heater outdoors

with a vent stack, the indoor clearances may be

utilized.

The combustion air intake hood MUST be used for

outdoor installations. The hood is shipped loose and

installed on the side of the heater over the filter box at

the job site.

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Raypak HI DALTA HD101 User Manual Page 11

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