Raypak 850 Instructions d'exploitation télécharger pdf (Page 11)

Combustion Air Filter

This heater is supplied with an integral combustion air

filter. This filter will reduce the amount of particulates

that pass 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.

Direct Vent

If outside air is drawn through the intake pipe directly

to the unit for combustion:

1. Install the combustion air ducting kit.

2. Install combustion air direct vent in accordance

with Fig. 24 (horizontal) or Fig. 26 (vertical) of this

manual.

3. Ventilation of the space occupied by the heater(s)

is recommended and can be provided by an open-

ing(s) for ventilation air at the highest practical

point communicating with the outdoors. The total

cross-sectional area should be at least 1 in² of free

area per 20,000 BTUH (111 mm² 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 should be at least 1 in² of free

area per 10,000 BTUH (222 mm² per kW) of total

input rating of all equipment in the room when the

opening is communicating with the outdoors

through horizontal duct(s). Damage to the equip-

ment due to inadequate ventilation of the space is

not a warrantable failure.

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

up, Raypak highly recommends the installation of

a motorized sealed damper on the air intake to

prevent the circulation of cold air through the

heater during the non-operating hours.

TruSeal™ Combustion Air

In addition to the 4 previous steps, combustion air may

be ducted directly to the heater by using PVC, CPVC

or sealed single-wall galvanized ducting. The duct will

attach directly to the air collar located on the rear of the

heater when the combustion air ducting kit is installed,

using three or four sheet metal screws (not supplied)

equally positioned around the circumference of the

duct. The screws and duct connection point must be

ealed with RTV (not supplied). TruSeal is generally

used when damaging contaminants are present in the

mechanical room. All ducting must be self-supported.

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 a

room large in comparison (NFGC). The total input of all

gas utilization equipment installed in the combined

space shall be considered in making this determina-

tion. Each opening shall have a minimum free area of

1 in.

per 1,000 BTUH (2,225 mm

per kW) of the total

input rating of all gas utilization equipment in the con-

fined space, but not less than 100 in.

(645 cm

). One

opening shall commence within 12 in. (305 mm) of the

top, and one opening shall commence within 12 in.

(305 mm) of the bottom of the enclosure. The mini-

mum dimension of air openings shall be not less than

3 in. (76 mm) in any direction.

All Air from Outdoors

The confined space shall communicate with the out-

doors in accordance with one of the methods below.

The minimum dimension of air openings shall not be

less than 3 in. (76 mm) in any direction. Where ducts

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

area as the net free area of the openings to which they

connect.

1. Two permanent openings, one commencing

within 12 in. (305 mm) of the top, and one com-

mencing within 12 in. (305 mm) of the bottom of

the enclosure, shall be provided. The openings

shall communicate directly, or by ducts, with the

outdoors or spaces (crawl or attic) that freely com-

municate with the outdoors.

CAUTION: Use TruSeal combustion air if

damaging airborne contaminants are or may be

present in the boiler area. See the Appendix of this

anual regarding air contamination.

NOTE: To ensure proper cooling and ventilation of

components, do not block any air openings in the

cabinet

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Raypak 850 Instructions d'exploitation Page 11

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