Raypak HI DALTA HD101 User Manual download pdf (Page 31)

Vertical Direct Vent System

Installation

hese installations utilize the heater mounted blower

to draw combustion air from outdoors and uses the

natural buoyancy of the heated flue products to create

a thermal driving head that expels the exhaust gases

rom the flue. The negative draft must be within the

range of -0.01 to -0.08 in. WC as measured 12 in. from

the appliance outlet to ensure proper operation. The

vent material must be in accordance with the above

instructions for vent materials. Vent material must be

listed by a nationally recognized test agency.

The maximum and minimum venting length for

Category I appliance shall be determined per the lat-

est edition of the NFGC (U.S.) and B149 Installation

Code (Canada).

The connection from the appliance exhaust vent to the

stack must be as direct as possible and should be the

same as or larger than the vent outlet. The vent must

be installed to prevent accumulation of condensate

and, where necessary, have means provided for

drainage of condensate. The horizontal breaching of a

vent must have an upward slope of not less than 1/4

inch per linear foot from the heater to the vent termi-

nal. The horizontal portions of the vent shall also be

supported for the design and weight of the material

employed to maintain clearances and to prevent phys-

ical damage or separation of joints.

Vertical Direct Vent Termination

The exhaust vent terminal should be vertical and

should terminate outside the building at least two (2)

feet above the highest point of the roof within 10 feet.

The vent cap should have a minimum clearance of

four (4) feet horizontally from and in no case above or

below (unless a four (4) foot horizontal distance is

maintained) electric meters, gas meters, regulators

and relief equipment. The distance of the vent terminal

from adjacent public walkways, adjacent buildings,

open windows and building openings must be consis-

tent with the NFGC, or in Canada, the B149

Installation Code. Gas vents supported only by flash-

ing and extended above the roof more than five feet

should be securely guyed or braced to withstand snow

and wind loads.

The vertical direct vent cap is designed for roof top

mounting only. The air inlet opening MUST be installed

one (1) foot above the roof line or above normal snow

levels that might obstruct combustion air flow. This

dimension is critical to the correct operation of the

heater and venting system and reduces the chance of

blockage from snow. The vent cap must have a mini-

mum 3 foot clearance from the air inlet opening.

Outdoor Installation

Outdoor models are self-venting when installed with

the factory-supplied vent assembly and air intake

over and require no additional vent piping. This spe-

cial vent assembly is provided with the heater in

accordance with CSA requirements. It must be

installed directly on the heater. See the Venting sec-

tion for correct clearances.

Care must be taken when locating the outdoor unit

because the flue gases discharged from the vent

assembly can condense as they leave the assembly.

Improper location can result in damage to adjacent

structures or building finish. For maximum efficiency

and safety, the following precautions must be

observed:

a) Outdoor models must be installed outdoors and

must use the outdoor vent assembly and air intake

cover supplied by the manufacturer.

b) Periodically check venting system. The heater’s

venting areas must never be obstructed in any

way and minimum clearances must be observed

to prevent restriction of combustion and ventilation

air. Keep area clear and free of combustible and

flammable materials.

c) Do not locate adjacent to any window, door walk-

way, or gravity air intake. The vent must be located

a minimum of four (4) feet horizontally, or four (4)

feet below, or one (1) foot above such areas.

d) Install above grade level and above normal snow

levels.

e) Vent must be at least 3 feet above any forced air

inlet located within 10 feet.

f) Adjacent brick or masonry surfaces must be pro-

tected with a rust-resistant sheet metal plate.

g) Multiple Outdoor Vent installations require a four

(4) feet clearance between vent assemblies.

The vent assembly must be furnished by the

heater manufacturer in accordance with its listing.

NOTE: Condensate can freeze on the vent

assembly. Frozen condensate on the vent assembly

can result in a blocked flue condition.

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Raypak HI DALTA HD101 User Manual Page 31

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