READ AND SAVE THESE INSTRUCTIONS.
MODEL A24DD
DIRECT DRIVE
WHOLE HOUSE VENTILATORS
LEAVE THIS MANUAL WITH HOMEOWNER
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CEILING INSTALLATION
LOCATING & MOUNTING FAN
FIG. 1
STEP 1 — The A24DD fan mounts on ceiling joists that are
spaced 16” O.C. Fan should be located in center of house,
preferably in hallway or corridor. This will allow air to be drawn
through all parts of living space. (See Fig. 1.) Determine tenta-
tive location of fan and proceed as shown below.
STEP 2 — Determine joist direction and locate center joist in ten-
tative fan opening. Lightly pencil a rectangular 30 1/2” x 33 1/2”
opening on ceiling below where shutter is to be located. Make
sure 33 1/2” side is parallel to joist direction. Check to be sure
that enough clearance area is available on ceiling for overlap of
shutter flanges (1 1/2” on all sides). Drill two small pilot holes
close to center joist, (one on either side) to indicate where hole
will be centered. (See Fig. 2.)
FIG. 2
EA
HOLES
STEP 3 — Now clear insulation and find pilot holes in attic.
Tentatively lay out same rectangular hole as on ceiling below.
Adjust location of hole if necessary to insure a minimum verti-
cal clearance from roof rafters of 18” above fan (Fig. 3).
FIG. 3
18” MIN
CLEARANCE
STEP 4 — Carefully cut hole in ceiling (Fig. 4), being careful not
to cut into center joist. Cut along both sides of the center joist,
leaving the 1 1/2” (approximately) strip of ceiling sheet rock cov-
ering the center joist.
2 X 6 JOISTS
(DO NOT CUT!)
If you have 2 x 4 joist construction, the joists on which
the fan will be mounted must be built up to 2 x 6 joist height. This
can be done very easily at this point by nailing (3) 2 x 2 furring
strips 38” long to the top of the joists, one on each joist.
STEP 5 — Remove adhesive backing from the 1/2” x 1/2” gas-
ket material and attach to the bottom flanges of fan which rest on
the joists. (Fig. 5) Now place fan on joists. Install grommet in
bracket (Fig. 5) and attach on each end of fan, using two of the
short screws provided. Position fan over opening so that grom-
mets are resting against center joist. Attach fan and brackets to
center joist with the two long wood screws and flat washers. Do
not crush grommet when tightening screws.
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WIRING
STEP 6 — PRECAUTIONS: READ CAREFULLY BEFORE WIRING FAN!
A. Electrical connections and all wiring should be in accordance with the National Electrical Code and all local codes that may
apply.
B. To avoid possibility of serious injury or electrical shock, the installer must disconnect electrical circuit supplying power prior
to wiring fan.
C. CAUTION: Incorrect wiring can cause motor failure and possibly fire. Marley Engineered Products will not accept liability
for damage resulting from incorrect wiring. Follow all wiring diagrams and instructions carefully!
D. This fan is designed to run on 120 volt A.C. 60 Hz power only.
STEP 7 — The 3-speed control packed with this fan is used to operate the fan from a remote wall location. Generally the best location is in
the hallway near the fan. The control should be in sight of the fan. Install a single switch box at the location chosen.
STEP 8 — The wiring diagrams, Figs. 6 & 7, show two alternate methods of wiring fan control. If the 120V power supply is available at the
fan, Fig. 6 should be followed. If the 120V power supply is available at the control, Fig. 7 should be followed. In either case, note that the
brown control wire must be connected to the black (hot) wire from the 120 volt power supply
FAN MOTOR OUTLET BOX
CONTROL OUTLET BOX
FIG. 6
BLACK (HI)
BLUE (MED)
RED (LOW)
BLACK (HI)
BLUE (MED)
RED (LOW)
WHITE (COM)
CONTROL
MOTOR
BLACK
WHITE
BROWN
120 V, 60 HZ
GND. SCREW
120 V SUPPLY AVAILABLE AT FAN
FAN MOTOR OUTLET BOX
CONTROL OUTLET BOX
BLACK (HI)
FIG. 7
CONTROL
BLACK (HI)
BLUE (MED)
BLUE (MED)
MOTOR
RED (LOW)
RED (LOW)
BROWN
WHITE (COM)
BLACK
WHITE
120 V, 60 HZ
GND. SCREW
120 V SUPPLY AVAILABLE AT CONTROL
STEP 9 — After determining which diagram applies, pull wires to fan and control switch box. Be sure to secure cable at fan to prevent it from
being caught in fan blade. Make connections to fan from room below, through hole cut in ceiling. After wiring of fan and control is completed
and checked against the appropriate wiring diagram, replace outlet box cover on fan and secure control in switch box. Leave control in “OFF”
position.
— 4 —
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FIG. 8
SHUTTER INSTALLATION
STEP 10 — Unpack Model A3024 shutter and read instruc-
tions included. Note that the first part of the shutter instruc-
tions refer to cutting the shutter hole, which you have already
done, and so they may be disregarded. Follow the remaining
instructions to adjust springs so that shutters open and close
freely. (See Fig. 8.)
STEP 11 — Mount shutter to joists directly below fan opening
with wood screws provided. Note sheet rock must be cover-
ing center joist before shutter is installed. Again, make sure
both sides of shutter open and close freely. (See Fig. 9.)
FIG. 9
STEP 12 — Return to attic and attach side panels to fan as
shown using remaining short screws and washers. (See Fig.
10.) Bottom of panels should rest upon ceiling. Bend flaps on
ends of panels back when inserting panels between joists.
These flaps will then spring back to seal off any space
between panel and joist.
STEP 13 — Fan installation is now complete. With control in
“OFF” position turn on 120V power supply to fan. Test run fan
through all speeds.
WALL INSTALLATION MODEL 3130 SHUTTER
THIS INSTALLATION IS TO BE USED ONLY IN AN ATTIC
GABLE OR WALL WHICH FACES AN UNOCCUPIED
AREA, AN AREA NOT READILY ACCESSIBLE TO PEO-
PLE OR ANIMALS! DO NOT USE THIS INSTALLATION IN
AN ATTIC WITH ANY TYPE OF LOOSE INSULATION.
STEP 1 — Construct wood frame as shown in Figs. 11 &
12. Use 2 x 8 framing lumber and 2 x 2 furring strips.
STEP 2 — Drill (4) holes 1⁄4” in diameter in fan housing as
shown in Fig. 13.
STEP 3 — Position fan in frame and secure with (4) wood or
lag screws (#12 x 11⁄2” preferred) through holes drilled in Step
2. Note 33⁄4” dimension from edge of frame. (Fig. 14)
STEP 4 — Secure Model 3130 shutter with (8) wood or lag
screws (#12 x 1” preferred) through holes in shutter frame.
Shutter should be positioned so that louvers swing outward
and upward. See Fig. 15. Check shutter to make sure it
opens and closes freely. Also check to make sure there is
clearance between shutter and fan blade.
STEP 5 — To mount this attic fan in gable or wall, a box must
be framed into wall construction as shown in Fig. 16. Make
opening in outside wall 37” x 37”.
STEP 6 — Insert frame containing fan and shutter assembly
into opening with outside surface of shutter frame flush with
outside surface of wall. See Fig. 16.
— 5 —
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STEP 7 — Nail frame assembly securely in place with 2 x 2 furring strips. See Fig. 17. Put moulding around outside of shutter as shown in
Fig. 17. Moulding should be at least 4” wide. Caulk around moulding to provide a water-tight seal. Check shutter again to be sure it opens
and closes freely.
STEP 8 — Wire fan to 120V power supply and 3-speed control. Follow steps 6 through 9 under wiring section of “CEILING INSTALLATION.”
STEP 9 — Fan installation is now complete. With control in “OFF” position turn on 120V power supply to fan. Test run fan through all speeds.
FIG. 15
FIG. 17
DOUBLE 2 X 6
HEADER
2 X 4 FRAMING
URE UNIT IN PLACE
TH 2” X 2” FURRING
RIPS INSIDE
FRAME HOLE AT
37” X 37”
SECURE UNIT IN PLACE
OUTSIDE WITH MOULDING
ATTIC AIR INTAKE AND DISCHARGE
Your wholehouse ventilator will be discharging a large volume of air into the attic every minute. It is obvious that provisions must be made to
allow this air to escape to the outside. The sketches below illustrate several different types of exhaust vents that are in common usage. Of
these types, the under-eave and gable methods are the most prevalent. Under-eave exhaust is probably the most satisfactory from the stand-
point of simplicity and economical installation.
Each size fan requires a given amount of minimum outlet in order to insure quiet operation and unrestricted air movement. The table
below shows the minimum area to be provided for each fan, and the increased size that is required if the outlet is restricted with louvres,
screening, etc.
Sufficient outlet air is most important. Unless enough is provided, the fan will be overloaded, and the motor will run hot, causing the ther-
mal protector to turn it off. When it cools, it will start again. Such intermittent operation is usually an indication of too little outlet air or too little
input air through the house.
MINIMUM ATTIC DISCHARGE AREAS REQUIRED
(All areas are in square feet)
FAN
SIZE
UNRESTRICTED*
OPENING REQD.
WOOD LOUVER*
OPENING REQD.
METAL LOUVER*
OPENING REQD.
24”
8.5
19.2
15
B (Ft.)
A (Ft.)
(1/2 A x B = AREA Sq. Ft.)
GABLE EXHAUST
A (Ft.)
(A x B = AREA Sq. Ft.)
GABLE EXHAUST
(A X B = AREA Sq. Ft.)
EAVE
EXHAUST
— 6 —
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REF
NO.
MODEL
USED ON
REF
NO.
MODEL
USED ON
DESCRIPTION
QTY.
DESCRIPTION
QTY.
15*
CAPACITOR, 6 MFD 379V
CAPACITOR, 12.5 MFD 370V
BOOT, CAPACITOR TERMINAL COVER
FAN HOUSING ASSEMBLY
FAN HOUSING ASSEMBLY
PANEL, SIDE
SCREW, 10-16 X 1/2 TYPE AB
WASHER, 9/32” ID 5/8” OD
SCREW, 12-14 X 1 TYPE AB
GROMMET, RUBBER
1
A24DD
B30DD
ALL
A24DD
B30DD
ALL
ALL
ALL
ALL
ALL
1*
2*
RETAINING RING
1
1
1
1
1
4
4
4
4
2
1
2
2
1
2
1
1
ALL
A24DD
B30DD
A24DD
B30DD
ALL
ALL
ALL
ALL
ALL
ALL
ALL
ALL
ALL
ALL
A24DD
B30DD
FAN BLADE ASSEMBLY - 24”
FAN BLADE ASSEMBLY - 30”
MOTOR, PSC 120V 1/3 HP 3 SPEED
MOTOR, PSC 120V 1/3 HP 3 SPE3D
SCREW, 1/4-20 X 1 TRUSS HEAD
WASHER, FLAT 5/16” ID 7/8” OD
SPACER, 1/4” ID X 7/16”
GROMMET, RUBBER
NUT, HEX LOCK 1/4-28
MOTOR MOUNT ASSEMBLY
SCREW, 1/4-28 X 7/8 HEX HEAD
SCREW, 6-21 X 1/4
16*
17*
1
1
3*
18*
19*
20*
21*
22*
23*
24*
25*
26†
27†
4
10
10
2
2
2
4
4*
5*
6*
7*
8*
BRACKET, MOUNTING
ALL
ALL
ALL
ALL
9*
NUT, SERRATED FLANGE 1/4-20
CONTROL ASSEMBLY - 3 SPEED
GASKET, 1/2” X 1/2” P/SENSITIVE
INSTRUCTION SHEET
10*
11*
12
13*
14
1
5.4 LF
1
COVER, OUTLET BOX
SCREW, 10-14 X 1/4
BRACKET, CAPACITOR MOUNTING
BRACKET, CAPACITOR MOUNTING
ALL
* STANDARD HARDWARE ITEM, AVAILABLE LOCALLY
† ITEM NOT SHOWN
— 7 —
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OPERATING HINTS AND SUGGESTIONS
1. Never operate a wholehouse ventilator with all outside doors and windows closed. Air will be drawn down the chimney, bringing soot into
the house. This could also impair flue gas ventilation of furnaces, water heaters, etc. located in the house, possibly drawing fumes into
the house. Be sure to open enough doors and windows to provide adequate ventilating air intake.
2. For best results, open windows in OCCUPIED rooms only. This will insure maximum breeze where you want it most. Before retiring at
night, bedroom windows may be opened 15-20 minutes earlier in order to give the fan opportunity to draw out bedroom heat and bring
in cooling air from the outside. Windows should be opened 4”-6” from the bottom for best results.
3. Experiment with the drawing power of the fan. It is possible, by regulating room doors and windows, to get the air movement through
several rooms without actually opening windows in all the rooms. Air in the house acts like water in a pipe; it follows the path you provide.
4. MAINTENANCE: TURN OFF ALL ELECTRIC POWER TO THE FAN AT THE CONTROL PANEL—REMOVE FUSE OR DISCONNECT
CIRCUIT BREAKER BEFORE PERFORMING ANY MAINTENANCE.
If your motor is provided with oil caps, once each year, after 3 years use, oil the front and rear motor bearings with four drops of SAE 20
weight non-detergent motor oil.
5. Check fan periodically for insulation or any foreign materials having fallen into or onto any part of the fan.
ACCESSORIES
The model 1012A Timer may be used to control the fan it if is desirable to run the fan after retiring at night. This timer can be set manually to
run up to 12 hours, turning fan off automatically at the pre-set time.
LIMITED WARRANTY
Dear Customer,
Thank you for your interest in Marley Engineered Products products. We’re sure you will
enjoy its benefits for many years to come. Please take a minute to fill out the following
information and keep it in your permanent records.
3. The Marley Engineered Products Service Representative will determine the best way
to resolve the difficulty.
Date Purchased
Model Number
Date Installed
Products within warranty which have been installed and returned to the seller for repair will
be repaired and returned as used products. Repairs to products outside the warranty peri-
od will be subject to labor and parts charges.
Serial Number
LIMITED WARRANTY
This Marley Engineered Products product is warranted to be free of defects in material and
workmanship for 12 months from date of original purchase.
Some states have enacted legislation which (a) does not allow the inclusion of limitations
on incidental or consequential damages; (b) does not allow limitations on the length of a
warranty period; (c) precludes exclusion, during the period of a limited warranty, of any
implied warranties of merchantability or fitness for purpose.
There is no other warranty, express or implied, except such as is expressly set forth herein.
Seller will not be liable for any general, consequential, or incidental damages, including without
limitation any damages for loss of use or loss of profits, for any breach of warranty or for neg-
ligence. Seller’s liability and buyer’s exclusive remedy are limited to the repair of defective
goods or the shipment of equivalent goods, or the granting of a reasonable allowance on
account of any defects, as the seller may elect.
To the extent of such provisions being applicable in your state, the limitations in this war-
ranty may not apply.
TO ENSURE SAFE OPERATION
• Be sure that this unit is correctly installed and wired by a qualified installer in accordance
with the instructions and applicable NEC or equivalent codes.
• Be sure that operating instructions are followed and that moving and heating parts are
kept clean and free from obstructions.
To obtain performance under this warranty, you must:
1. Contact the Marley Engineered Products Service Department at 1-800-642-HEAT between
the hours of 8:00 a.m. and 5:00 p.m. E.S.T. Monday through Friday.
Any warranties granted or liabilities assumed hereunder will not apply to goods that have
been damaged in transit, altered, repaired, installed or operated otherwise than in confor-
mity with the above requirements for safe operation.
2. Provide the model number of the product, the date of installation, and state the nature of
the difficulty being experienced.
HOW TO ORDER REPAIR PARTS
In order to obtain any needed repair or replacement
parts, warranty service or technical information, please
contact Marley Engineered Products Service Center toll-
free by calling 1-800-642-HEAT.
When ordering repair parts, always give the informa-
tion listed as follows:
SPX Corporation
470 Beauty Spot Rd. East
Bennettsville, SC 29512 USA
1. The Part Number
2. The Model Number
3. The Part Description
4. Date of Manufacture
Part No. 5200-2545-000
PPD 035
3-00
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