Atwood 8940 Manuale tecnico di installazione - Pagina 4

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120

VOLT AC MODELS

Route 120 volt AC and thermostat leads to wires located on the left

side of control box using a minimum of 18 GA wire. The furnace must

be installed so electrical components are protected from water. To

make electrical connections see

1. Route wiring to left side of furnace.

2. Remove junction box cover.

3. Connect 120 white wire to furnace 120 white wire.

4. Connect 120 black wire to furnace 120 black wire.

5. Connect ground wire to furnace green ground wire.

After field hookups have been made, put wire connections into

furnace junction box and replace cover.

6. Connect thermostat leads to the two blue furnace thermostat leads.

: Furnace is equipped with a 120 volt AC motor. All other

NOTE

electrical component parts are supplied with power from a trans-

former inside the furnace at 24 volts AC.

: A 120 volt model can also be supplied with a 30 inch

NOTE

power cord attached from the factory supplied with a molded plug

with ground pin.

: DC units are supplied with a power switch

NOTE

which when turned OFF for servicing will remove power through the

furnace wiring. Switch must be in ON position for furnace to operate.

See

1-D. AC units power switch is in valve circuit only.

FIG

POWER SUPPLY

Atwood Mobile Products highly recommends the use of an electronic

(solid state) converter with clean, clear power output. This will assure

the life of the electronic controls and motor life could be extended as

much as 500% beyond typical linear converter applications.

THERMOSTAT INSTALLATION

The thermostat is very sensitive.

Locate thermostat 48˝ to 54˝ above floor on an

areas of abnormal heat or cold.

spacer between thermostat and exterior wall.

Follow manufacturer's installation instructions provided with thermo-

stat. When a thermostat is not supplied use a thermostat rated for 12

VDC or 24 VAC minimum lamp.

DOOR INSTALLATION

HORIZONTAL & VERTICAL

CARBON MONOXIDE POISONING

• Properly seal door to prevent carbon monoxide from entering coach.

1. Secure mounting brackets (

furnace opening 5/16˝ from bracket face to exterior wall of coach.

2. Before installing recessed bezel/door assembly remove rain shield

(

9-A). Vertical Units Rain Shield not required and not returnable.

FIG

3. Slide furnace in cavity.

DO NOT

wall until door is ready to be installed.

4. Pull furnace forward until mounting tabs protrude through exterior

wall. The edge of control box is flush with coach's outer skin.

5. The door bezel (

7-8A) and recess pan must fit tightly, to prevent

FIG

water leakage.

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

NOTE

side) to prevent water intrusion into the interior.

6. To prevent moisture from entering inside of coach, apply RTV type

sealant to following areas:

HORIZONTAL

VERTICAL INSTALLATION

• entire mounting surface of door bezel, caulking must be tight

against inner flange of bezel.

• bending tabs over, fill tabs slots with caulking, securing with screws.

VERTICAL INSTALLATION

YOU MUST CAULK

• around red gas inlet plug (slide plate and casing bottom intersect).

• around back of slide plate where it joins metal casing.

• around gas line where it enters gal inlet plug.

• along welded joints of two bottom corners of casing.

WIRING DIAGRAM FIG 12

HANDLE WITH CARE AT ALL TIMES

wall away from

INTERIOR

wall location must have a 3/4˝

EXTERIOR

(

FIG

6-8A)

WARNING

6) to wood framing on each side of

FIG

have tabs protrude outside exterior

7. The inlet plug and slide plate must be in closed position and bezel

flange inside of casing. Insert six mounting tabs through slots pro-

vided in bezel, making sure bezel is tight against casing and cutting

into RTV sealant on bezel.

• fill tab slots with caulking after bending tabs over and securing

with screws.

8. Bend tabs flush with door bezel, aligning holes in tabs with slots in

door bezel.

9. Install 12 mounting screws.

10. Remove excess sealant from around door bezel and visually

inspect the door bezel to make sure it is completely sealed.

11. Secure mounting legs to floor for horizontal installation. Seal

around slide plate, gas plug and joint between control box right

side and back wall.

12. Fasten door (

RAIN SHIELD INSTALLATION

HORIZONTAL

Install rain shield after recessed bezel and door bezel are in place.

The rain shield must be in place to prevent water leakage on horizon-

tal units.

1. Insert rain shield on a 45˚ angle into right side of control box

making certain rear portion of rain shield is positioned under heat-

ing element exhaust tube

2. Lower left side of rain shield and position into place

3. Secure rain shield with one #8 x 1/2˝ screw into combustion

blower scroll

- Rain Shield not required on vertical unit and it's not a

VERTICAL

returnable part.

DRAFT CAP ASSEMBLY

CARBON MONOXIDE POISONING

• Properly adjust draft cap to prevent carbon monoxide from

entering the coach.

With wing nut 10-C loose on draft cap assembly, close door 10-A and

adjust draft cap 10-D. The draft cap assembly must be pulled out tight

against door screen 10-B. Open door 10-A and tighten wing nut 10-C.

CONVERTIBLE GAS CONTROL

MODEL UNITS

unit is supplied with two main burner orifices. One will be in place, the

other will be attached to blower housing cover. Each orifice will be

clearly marked with a drill size as shown below.

GAS TYPE

(

)

PROPANE

(

)

NATURAL

NAT

(

)

PROPANE

(

)

NATURAL

NAT

The pressure settings of the convertible valve are set for natural gas

NAT 3.5˝ W.C. or LP 10.5˝ W.C. and are not adjustable. Use Loctite

#RC609 on orifice threads when installing a new orifice. 1/8˝ NPT plug

is provided upstream of gas connections for checking gas pressure.

VALVE CONVERSION

1. Check exposed section on side of adjustment plug to determine

whether it is set for natural or propane. NAT is stamped on one end

and LP is stamped on the other end of plug. The types of gas in use

will be showing right side up.

2. Unscrew plug and remove from valve tower.

tower or make any adjustments.

deform bezel.

DO NOT

6-8A) with fasteners provided.

FIG

HORIZONTAL

. 9-A.

FIG

9-B.

FIG

(

FIG

10)

WARNING

FIG 5

come equipped with a convertible gas control. Each

BTU

LINE PRESSURE

VALVE REGULATOR

40,000

11˝ W.C.

40,000

7˝ W.C.

35,000

11˝ W.C.

35,000

7˝ W.C.

(

FIG

(

VERTICAL

FIG

9-2.

FIG

DRILL SIZE

10.5˝ W.C.

49P

3.5˝ W.C.

30N

10.5˝ W.C.

51P

3.5˝ W.C.

32N

remove rod from

DO NOT