Atwood AFLA35 Panduan Instalasi Teknis - Halaman 4

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 Horizontal Bottom Discharge: This installation is for horizontally

installed units and can be used with the addition of one duct any

location except the top two.

 Vertical Bottom Discharge: Installation of the furnace in a

vertical mounting position can be used with the addition of one

duct any location except the top two.

REQUIRED DISCHARGE

Models

AFL (35)(40)

Horizontal Bottom

Vertical Bottom

System

AFLD35

AFLD40

4" Duct

Bottom plus

4x10

4"duct min

Vertical

5x9-3/4

Bottom

*Note the table is for minimum requirements and should in most

cases allow the unit to operate correctly. If the burner cycles on

and off on high temperature limit. Extra ducting can be used to

help correct this condition due to restriction or bends in duct

work.



Proper duct installation is critical to operation of furnace. When

installing ducts, use materials rated for continuous use at 200°F.



Each 4-inch duct opening provides 12 in

Provide an extra 12 in

of non-closeable duct discharge area for

each closeable register used.



Ducting into dead air space with no return air, such as holding

tank areas, does not count toward achieving minimum discharge

requirements.



Adjust ducting installation to obtain air rise of 100°F-130°F. Also

see air flow check section.

Required Discharge Area

36 in

48 in

AFLA35

AFLA40

4x10

5x9-3/4

of discharge area.

FLEXIBLE DUCTING

When designing flexible duct systems:



Follow ducting configuration shown



Avoid sharp bends or crushed ducts.



Stretch all ducts and run them directly to outlets, keeping quantity

and angles of bends to a minimum.



Remove knockout plate from desired outlets. If a knockout is

removed accidentally a cover plate can be purchased.



Attach a duct adapter by inserting flange over casing hole, locking

the tab into casing slot and turning adapter 90°.



Attach and secure four-inch flexible duct to adapter(s).



Run duct(s) to desired location within RV, secure to register(s).

AIR FLOW CHECK



Appliance is tested to a temperature rise as specified on the

Rating Plate. After installation of the furnace and duct system is

completed, adjustment to obtain a temperature rise should be

4x10

made.



The table below is a reference to maintain maximum operation of

the appliance when checking temperature rise is not possible.

Airflow measurements made at each registers the total reading

should not be less than what is shown in table below for each

BTU size.



If readings are below the table values airflow can be improved by

adding ducts or reduce restrictions in the system.

Total fpm= feet per minute readings

FURNACE INSTALLATION



The furnace should always be installed level (front to back, side to

side) to prevent water intrusion into the interior.



Set aside venting and outer door parts for installing on the outside

of coach.



NOTE to assure sufficient return air to circulating blower maintain

specified clearances.



If units are installed using the small outside vent system access to

the inside of the coach must be provided directly in front of the

unit to remove for service suggested opening size 17" wide by 9-

1/2" height.



Remove knockouts from furnace and install duct adapters for side

discharge by inserting back flange over casing and inserting tab

into square notch, then twist adapter 90°.



Insert furnace into cabinet opening and secure with two screws

through casing legs to floor. Units are secured by door or vent

systems through the coach sidewall.



Attach flexible ducting over duct adapters and secure. All flex

ducting requires rating of 200°F.



Run ducting to locations keeping bends and excess ducting to a

minimum and secure to registers.



Connect wiring to located on the top of the furnace. See wiring

connection section.



Connect gas line to top or rear of furnace. See gas connection

section.

SIDEWALL CUTOUT

Maximum exterior wall thickness 0" to 2-1/2" an optional vent kit can be

purchased to extend the vent usage to 3" wall thickness for small vent

installations

WALL CUTOUT

(Flush Door requires 3/4" radius corners)

Flush Door (corner cut requires

3/4" radius) (horizontal or vertical)



DO NOT oversize hole – over sizing can result in water leakage.



Zero clearance around air intake cutout for best sealing condition.

35-40 DC

35-40 AC

4600 fpm

5000 fpm

18-1/4"

11 1/8"

20"