Reznor EEDU Unit Installation Manual Manual do Utilizador descarregar pdf (Página 14)

Form I-EEDU, Page 14

6.2 Venting (cont'd)

6.0 Mechanical

(cont'd)

Venting Requirements cont'd)

FIGURE 11B - Horizontal Vent Terminal

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Single-Wall or Category III Vent Run

and Single-Wall Terminal End

Single-Wall or Category III Vent Run

and Double-Wall Terminal End

6.3 Duct Furnace

Airow

To determine temperature rise, the inlet and outlet air temperatures should be mea-

sured at points not affected by heat radiating from the heat exchanger. The Tempera-

ture Rise and Pressure Drop chart shows the approved temperature rise range with the

required CFM and the internal pressure drop for each size of unit.

The duct furnace must be installed on the positive pressure side of the eld-supplied

blower. The air throughput must be within the CFM range stated on the heater rating

plate. The air distribution must be even over the entire heat exchanger. Turning vanes

should be employed in elbows or turns in the air inlet to ensure proper air distribution

(See Paragraph 6.3.2).

6.3.1 Pressure Drop and

Temperature Rise by

Size

Size 75 100 125 140 170 200 225 250 300 350 400

Temperature

Rise

CFM P.D. CFM P.D. CFM P.D. CFM P.D. CFM P.D. CFM P.D. CFM P.D. CFM P.D. CFM P.D. CFM P.D. CFM P.D.

Model EEDU (80% thermal efcient)

50°F 1105 0.24 1475 0.43 1840 0.49 2065 0.65 2505 0.67 2945 0.67 3315 0.69 3685 0.67 4420 0.70 5160 0.75 5895 0.77

60°F 920 0.16 1225 0.30 1535 0.33 1720 0.43 2085 0.46 2455 0.46 2765 0.47 3070 0.45 3685 0.47 4300 0.52 4915 0.52

70°F 790 0.10 1050 0.21 1315 0.25 1475 0.32 1790 0.33 2105 0.35 2370 0.36 2630 0.34 3160 0.35 3685 0.38 4210 0.38

80°F 695 0.07 920 0.16 1150 0.20 1290 0.24 1565 0.25 1840 0.26 2070 0.27 2300 0.26 2765 0.27 3225 0.28 3685 0.28

90°F 615 0.05 815 0.12 1020 0.17 1145 0.20 1390 0.19 1635 0.20 1840 0.21 2045 0.20 2455 0.22 2565 0.23 3275 0.22

If it is determined that the blower CFM is greater than allowed or desirable, see Para-

graph 6.3.3 for instructions on determining the correct size of bypass duct required or

see the APPENDIX, page 30, for instructions on converting the furnace for a higher

CFM application.

Structure

Minimum Clearances for Vent

Termination Location (all

directions unless specied)

Forced air inlet within 10 ft

(3.1m)

3 ft (0.9m) above

Combustion air inlet of another

appliance

6 ft (1.8m)

Door, window or gravity air inlet

(any building opening)

4 ft (1.2m) horizontally

4 ft (1.2m) below

3 ft (0.9m) above

Electric meter, gas meter * and

relief equipment

4 ft (1.2m) horizontally

Gas regulator * 3 ft (0.9m)

Adjoining building or parapet 6 ft (1.8m)

Grade (ground level) 7 ft (2.1m) above

*Do not terminate the vent directly above a gas meter or service

regulator.

Horizontal Vent Terminal (FIGURE 11B) Clearances

The location of the termination of the horizontal vent system

must be in accordance with National Fuel Gas Code Z223.1.

See table for required minimum clearances.

If the vent terminal is to be installed near ground level, position

it at least six inches above maximum anticipated snow depth.

NOTE: Maintain the required clearance from the wall to

the vent terminal cap for stability under wind conditions

and to protect the building.

Products of combustion can cause discoloration of some build-

ing nishes and deterioration of masonry materials. Applying a

clear silicone sealant that is normally used to protect concrete

driveways can protect masonry materials. If discoloration is

an esthetic problem, relocate the vent or install a vertical vent.

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