Reznor EEDU Unit Installation Manual Uživatelský manuál stáhnout pdf (Strana 15)

Form I-EEDU, P/N 150492 R6, Page 15

6.3.3 Constructing

Bypass Duct

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

FIGURE 13 - Bypass Duct

Bypass CFM

"A" Pressure Drop through the Furnace

Width 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50

490 530 610 700 780 830 900 960 1010

630 750 870 980 1090 1160 1250 1310 1400

850 1010 1190 1300 1410 1520 1640 1730 1810

1050 1290 1480 1650 1800 1940 2090 2200 2320

1250 1510 1760 1960 2180 2320 2500 2650 2800

1490 1810 2100 2350 2560 2760 2940 3110 3290

1700 2100 2400 2700 2970 3200 3400 3600 3800

10"

1920 2350 2760 3090 3650 4020 4300 4550 4800

When the CFM of air throughput is greater than desirable or permissible for the unit,

a bypass duct may be constructed. Follow these instructions to determine the correct

size of the bypass duct.

Directions for Sizing

Bypass Duct

6.3.2 Duct Furnace

Blower Connections

Proper arrangements of blower and duct furnace with respect to angle of approach

of the duct connection and the arrangement of the discharge opening of the blower

are shown. Blowers should be bottom horizontal discharge when coupled to the duct

furnace. When a top horizontal discharge blower is connected to the duct furnace, be

sure that sufcient length of duct is provided to permit even ow of air at the end of the

duct. Or, bafes may be inserted between the blower and the heater to assure an even

ow of air across the heat exchanger. See illustrations in FIGURE 12 A, B, and C.

FIGURE 12A - Straight

through Air Blower

Connection

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WARNING

The furnace must be installed on the positive pressure side of the air-circulating blower. See Hazard

Levels, page 2.

FIGURE 12B - Blower

Connection With

Elbows Up or Down

FIGURE 12C - Blower

Connection with Elbows

Right or Left

1) From the tables in Paragraph 6.3.1, nd the pressure drop (P.D.) and the allowable

CFM for the furnace that is being installed.

Example: Standard Size 170 @ 70°F temperature rise; P.D. .33; CFM 1790

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 31 32

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