Zephyr ZNA-M90BS Installation guide

Use, Care, and Installation Guide
Model number:
Serial Number:
www.zephyronline.com
JUL12.0401 © Zephyr Corporation
Airflow Control Technology
TM
C
+
Napoli
ZNA-M90BS
ZNA-E42BS

www.zephyronline.com

1
SAFETY NOTICE ................................................................. 2-3
LIST OF MATERIALS....................................................... 4
INSTALLATION
Ducting Calculation Sheet....................................... 5
Mounting Height & Clearance................................ 6
Ducting Options........................................................... 7
Hood Specifications................................................... 8
Mounting the Hood..................................................... 9-10
Ductless Recirculating .............................................. 11
FEATURES & CONTROLS
Touch Controls ............................................... 12
User Interface................................................. 13
MAINTENANCE
Hood and Filter Cleaning......................................... 14
TROUBLESHOOTING................................................................ 15
FAN CURVE DIAGRAMS ......................................................... 16-17
WIRING DIAGRAM...................................................................... 18
LIST OF PARTS AND ACCESSORIES .............................. 19
Table of Contents

Important Safety Notice
READ AND SAVE THESE INSTRUCTIONS
2
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WARNING
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT USE THIS FAN WITH ANY SOLID-STATE CONTROL DEVICE.
WARNING
TO REDUCE THE RISK OF FIRE ELECTRIC SHOCK, OR INJURY TO PERSONS, OBSERVE THE FOLLOWING:
a. Use this unit only in the manner intended by the manufacturer, if you have questions, contact the manufacturer.
b. Before servicing or cleaning unit, switch power off at service panel and lock panel to prevent power from being switched on accidentally.
When the service disconnecting means cannot be locked, securely fasten a prominent warning device, such as a tag, to the service
panel.
CAUTION
For general ventilating use only. Do not use to exhaust hazardous or explosive materials and vapors. Take care when using cleaning
agents or detergents. Suitable for use in household cooking area.
WARNING
TO REDUCE THE RISK OF RANGE TOP GREASE FIRE:
a. Never leave surface units unattended at high settings. Boilovers cause smoking and greasy spillovers that may ignite. Heat oils slowly
on low or medium settings.
b. Always turn hood ON when cooking at high heat or when flaming food
c. Clean ventilating fans frequently. Grease should not be allowed to accumulate on fan or filter.
d. Use proper pan size. Always use cookware appropriate for the size of the surface element.
e. Keep fan, filters and grease laden surfaces clean.
f. Use high setting on hood only when necessary.
g. Don’t leave hood unattended when cooking.
h. Always use cookware and utensils appropriate for the type of and amount of food being prepared.
WARNING
TO REDUCE THE RISK OF INJURY TO PERSONS IN THE EVENT OF A RANGE TOP FIRE, OBSERVE THE FOLLOWING:
a. SMOTHER FLAMES with a close-fitting lid, cookie sheet, or metal tray, then turn off the burner. BE CAREFUL TO PREVENT BURNS.
If the flames do not go out immediately, EVACUATE AND CALL THE FIRE DEPARTMENT.
b. NEVER PICK UP A FLAMING PAN – You may be burned.
c. DO NOT USE WATER, including wet dishcloths or towels – a violent steam explosion will result.
d. Use an extinguisher ONLY if:
1. You know you have a Class ABC extinguisher, and you already know how to operate it.
2. The fire is small and contained in the area where it started.
3. The fire department is being called.
4. You can fight the fire with your back to an exit
WARNING
TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK OR INJURY TO PERSONS, OBSERVE THE FOLLOWING:
a. Installation work and electrical wiring must be done by qualified person(s) in accordance with all applicable codes and standards.
Including fire-rated construction.
b. Sufficient air is needed for power combustion and exhausting of gases through the flue (chimney) of fuel burning equipment to prevent
back-drafting. Follow the heating equipment manufacturer’s guideline and safety standards such as those published by the National
Fire Protection Association (NFPA) and the American Society for Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) and
the local code authorities.
c. When cutting or drilling into wall or ceiling, do not damage electrical wiring and other hidden utilities.
d. Ducted fans must always vent to the outdoors.
e. NEVER place a switch where it can be reached from a tub or shower.
f. Make sure the power is off before installing, wiring or maintenancing.

Important Safety Notice
3
WARNING
TO REDUCE THE RISK OF FIRE, USE ONLY METAL DUCTWORK.
CAUTION
To reduce risk of fire and to properly exhaust air outside - Do not vent exhaust air into spaces within walls, ceilings,
attics, crawl spaces or garages.
Not for use over an outdoor grill.
OPERATION
Always leave safety grilles and filters in place. Without these components, operating blowers could catch onto hair, fingers
and loose clothing.
The manufacturer declines all responsibility in the event of failure to observe the instructions given here for installation,
maintenance and suitable use of the product. The manufacturer further declines all responsibility for injury due to
negligence and the warranty of the unit automatically expires due to improper maintenance.
*NOTE: Please check www.zephyronline.com for revisions before doing any custom work.
ELECTRICAL REQUIREMENTS
Important:
Observe all governing codes and ordinances.
It is the customer’s responsibility:
- To contact a qualified electrical installer.
- To assure that the electrical installation is adequate and in conformance with National Electrical Code, ANSI/NFPA 70
latest edition* or CSA standards C22.1-94, Canadian Electrical Code, Part 1 and C22.2 No.0-M91 - latest edition** and
all local codes and ordinances.
If codes permit and a separate ground wire is used, it is recommended that a qualified electrician determine that the
ground path is adequate.
Do not ground to a gas pipe.
Check with a qualified electrician if you are not sure the range hood is properly grounded.
Do not have a fuse in the neutral or ground circuit.
*National Fire Protection Association Batterymarch Park, Quincy, Massachusetts 02269
** CSA International 8501 East Pleasant Valley Road, Cleveland, Ohio 44131-5575
This appliance requires a 120V 60Hz electrical supply and connected to an individual properly grounded branch circuit
protected by a 15 or 20 ampere circuit breaker or time delay fuse. Wiring must be 2 wire with ground. Please also refer to
Electrical Diagram on product.
A cable locking connector (not supplied) might also be required by local codes. Check with local requirements, purchase
and install appropriate connector if necessary.
ZNA-M90BS, ZNA-E42BS - 215 Watts, 3.5 Amps
Power consumption shown above is the default power specs. Hoods with Zephyr’s proprietary Airflow Control Technology
(ACT) enabled will consume less power. See wiring diagram at the end of this manual for more information.

List of Materials
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(3) Wire Nuts (4)ø12 OD / ø5
ID Washers
(4) M6 x 1”
wood srews
(2) 3/16 x 1/4” pan-head
machine screws
(12) M3 x 5 pan-head
machine screws
(1) Hardware package
(1) 8” round damper (pre-installed)
MODELS: ZNA-M90BS, ZNA-E42BS
PARTS SUPPLIED
HARDWARE PACKAGE CONTENTS
PARTS NOT SUPPLIED
- Ducting, conduit and all installation tools
- Hack saw to cut down trim pieces
- Cable connector (if required by local codes)
- Duct cover extension accessory
- Recirculating kit accessory
(2) Top Duct Covers (1) Top Support Frame
(2) Bottom Duct Covers (1) Bottom Support Frame
(2) Thin Trim Pieces
(2) Thick Trim Pieces
(1) Hood Body
(4) 3W LED Light Bulbs
(3) Aluminum Mesh Filters
(1) M4 x 12
safety screw
A
B
Front of Hood
CL
/
Cut-Out Shaded Area
(1) Paper ceiling template

5
Duct pieces To t a l
Equivalent number
length x used =
3-1/ 4” x 10”
Rect.,
straight
1 Ft. x ( ) = Ft.
8” Round,
straight
1 Ft. x ( ) = Ft.
3-1/ 4” x 10”
Rect.900
elbow
15 Ft. x ( ) = Ft.
3-1/ 4” x 10”
Rect.450
elbow
9 Ft. x ( ) = Ft.
3-1/ 4” x 10”
Rect.900
flat elbow
24 Ft. x ( ) = Ft.
3-1/ 4” x 10”
Rect.
wall cap
with damper
30 Ft. x ( ) = Ft.
3-1/ 4” x 10”
Rect.to
6” round
transition
5 Ft. x ( ) = Ft.
3-1/ 4” x 10”
Rect.to
6” round
transition
900 elbow
20 Ft. x ( ) = Ft.
8” Round,
900 elbow
15 Ft. x ( ) = Ft.
8” Round,
450 elbow
9 Ft. x ( ) = Ft.
Ft.
7” Round,
straight
1 Ft. x ( ) = Ft.
Subtotal column 1 =
Duct pieces To t a l
Equivalent number
length x used =
6”- 8”Round
wall cap
with damper
30 Ft. x ( ) = Ft.
Round
wall cap
with damper
30 Ft. x ( ) = Ft.
7” or 8”
Round,
900elbow
15 Ft. x ( ) = Ft.
7” or 8”
7” or 8”
Round,
450
elbow
9 Ft. x ( ) = Ft.
Ft.
Ft.
Ft.
6”- 8” Round,
roof cap
30 Ft. x ( ) = Ft.
7” or 8”
Round,
roof cap
30 Ft. x ( ) = Ft.
Subtotal column 2 =
Subtotal column 1 =
Total ductwork =
Maximum Duct Length: For satisfactory air movement,
the total duct length
should not exceed 100 equivalent feet.
6” roundto
3-1/ 4” x 10”
rect.
transition
1 Ft. x ( ) = Ft.
6” roundto
3-1/ 4” x 10”
rect.
transition
900 elbow
16 Ft. x ( ) = Ft.
7” roundto
3 1/ 4” x 10”
rect.
transition
8 Ft. x ( ) = Ft.
7” roundto
3-1/ 4” x 10”
rect.
transition
900 elbow
23 Ft. x ( ) = Ft.
Installation – Ducting Calculation Sheet

Installation – Mounting Height & Clearance
6
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DUCTING
A minimum of 8” round duct is recommended to
maintain maximum air flow efficiency.
Always use rigid type metal ducts only. Flexible
ducts could restrict air flow by up to 50%.
Use calculation worksheet to compute total duct
work (Page 5).
ALWAYS, when possible, reduce the number of
transitions and turns. If a long duct run is required,
increase duct size from 8” to 10”.
If turns or transitions are required: Install as far
away from duct opening and as far apart between
the two transitions as possible.
Minimum mount height between range top to hood
bottom should be no less than 26”.
Maximum mount height should be no higher than
34”.
It is important to install the hood at the proper
mounting height. Hoods mounted too low could
result in heat damage and fire hazard; while hoods
mounted too high will be hard to reach and will
loose performance and efficiency.
If available, also refer to range manufacturer’s
height clearance requirements and recommended
hood mounting height above range. Always check
your local codes for any differences.
Duct cover extension kit available for ceiling
heights up to 12 feet. Turn to page 19 for part
number and ordering information.
DAMAGE-SHIPMENT / INSTALLATION:
• Please fully inspect unit for damage before
installation.
• If the unit is damaged in shipment, return the
unit to the store in which it was bought for
repair or replacement.
• If the unit is damaged by the customer, repair
or replacement is the responsibility of the
customer.
• If the unit is damaged by the installer (if other
than the customer), repair of replacement must
be made by arrangement between customer
and installer.
min. A
min. B
max. C
Standard Extension
Hood Heights Duct Cover Duct Cover
minimum ducted (A) 32” 49“
minimum recirculating (B) 36
1/2 ” 53 1/2 “
maximum (C) 50” 80”
Ceiling Heights
minimum ducted (D) 94” (7’ 10”) 111“ (9’ 3”)
minimum recirculating (E) 98
1/2 ” (8’2 1/2 ”) 115 1/2 “ (9’7 1/2 ”)
maximum (F) 120” (10’) 150” (12’ 6”)
36”
26” min.
34” max.
min. D
min. E
max. F

7
WARNING FIRE HAZARD
NEVER exhaust air or terminate duct work into spaces between walls, crawl spaces, ceiling, attics or garages.
All exhaust must be ducted to the outside, unless using the recirculating option.
Use single wall rigid metal ductwork only.
Fasten all connections with sheet metal screws and tape all joints w/ certified Silver Tape or Duct Tape.
Some Ducting Options
Installation – Ducting Options
side wall cap
w/ gravity damper
Soffit or crawl space
Roof Pitch w/
Flashing & Cap
ductless
recirculating

8
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Installation – Hood Specification
FRONT SIDE
TOP of HOOD TOP SUPPORT FRAME
(top view)
1 1/8”
5 5/16”
STANDARD
min. ducted - 32”
min. recirc. - 36 1/2”
max. - 50”
Z1C-01NA
min. ducted - 49”
min. recirc. - 53 1/2”
max. - 80”
9 13/16”
25 9/16”
12 13/16”
35 7/16”, 41 15/16”
9 9/16”
10 5/16”
7
15/16
”
2 1/16”
AC In
C/L
C/L
4 1/2”
9/16”FRONT
10 1/16”
10 1/14”
C/L
4 3/14”
6 3/4”

9
1
2
Ceiling Joists
Wood Blocking
Top Support Frame
Support Frame Arm
Bottom Support Frame
Hood Body
3
Mounting Screws
(pre-installed)
4
Installation – Mounting the Hood
1. Determine mounting location on ceiling and temporarily tape paper template (included with the hood) to
the ceiling. Cut out internal shaded area of template to allow the ducting and electrical to pass through.
If necessary, add wood blocking (min. 2” x 4”) to ceiling joists located behind the drywall to reinforce the
mounting location*. (FIG. A1) Secure (2) M6 x 1” wood screws to points A and B of the paper template (FIG.
G). Do not completely tighten screws, leave approx. 1/4” exposed.
2. Remove screws securing top and bottom support frames together. Adjust support frame to accomodate the
desired hood height and re-assemble the frame using the previously removed screws (2 screws for each
support frame arm). (FIG. A3)
3. Lift support frame assembly up to the ceiling making sure the word “front” on the top support frame faces the
front of the hood where the controls will be located. (FIG. B) The key holes on the top support frame should
cover the wood screws previously installed in the ceiling. Slide support frame towards narrow end of key
holes to lock the frame in place. Install the last (2) M6 x 1” wood screws with washers into the two remaining
corners of the top support frame to secure it to the ceiling. Tighten all screws.
4. Lift hood and align the (4) pre-installed mounting screws located on top of the unit body (FIG. A4) with the (4)
key holes on the Bottom of Support Frame. (FIG. C) Slide hood towards the narrow end of key holes to lock
into place. Hand tighten each of the (4) screws with a screwdriver to secure hood to Bottom Support Frame.
Further secure bottom support frame to unit body by one M4 x 12 safety screw. (FIG. F, pg 10)
*Hood is intended to be mounted to a finished ceiling.
CAUTION: At least two installers are
required due to the weight and size of the
hood.
!
Bottom Support Frame
(secures to top of blower housing)
Key Holes
front - facing controls
back
FIG. A
FIG. C
FIG. B
Side
Front
XP022220
A
B
Cut-Out Shaded Area
FIG. G
FRONT

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Installation – Mounting the Hood
1
2
4
3
5
Top Duct Covers
Top Support Frame
Bottom Duct Covers
Bottom Support Frame
Thin Trim Piece
Thick Trim Piece
5. Remove tape securing electronics mounting bracket to hood and reposition electronics mounting bracket.
(FIG. E) Install electrical and duct work. A cable lock, not supplied, might be required by local codes. (FIG.
E) Seal duct work with aluminum duct tape.
6. Power up hood, verify all functions and check for leaks around duct tape.
7. Assemble Top Duct Covers (with louver holes) together over Top Support Frame using (6) M3 x 5 screws,
(3) on each side of the duct cover. (FIG. D1). Larger screw hole openings should overlap the smaller hole
openings. Note: If using hood in ductless recirculating mode you must install the air diverter plate to the
Top Support Frame prior to assembling the duct covers. Turn to page 11 for more details.
8. Secure Top Duct Covers to Top Support Frame by using (2) 3/16 x 1/4 screws. (FIG. D2).
9. Assemble Bottom Duct Covers together over top duct covers using the final (6) M3 x 5 screws, (3) screws
on each side of the duct cover (FIG. D3). Bottom Duct Covers should rest on top of the Hood Body.
10. Insert the (2) Thin Trim Pieces into left and right seams of Bottom Duct Covers. (1 on each side)
(FIG. D4)
11. Insert the (2) Thick Trim Pieces into left and right seams of Top Duct Covers. (1 on each side)
Note: Because less of the Top Duct Covers may be exposed, it may be necessary to measure
and cut the Thick Trim Pieces with a hack saw before installing them into the Top Duct Covers.
Measure and cut carefully.
FIG. D
Cable Lock
Cable Lock
A cable locking connector (not
supplied) might be required
by local codes. Check with
local requirements and codes,
purchase and install appropriate
connector if necessary.
FIG. E
WARNING: Electrical wiring must be done by a qualified person(s) in
accordance with all applicable codes and standards. This range hood must be
properly grounded. Turn off electrical power at service entrance before wiring.
!
FIG. F

11
Ductless recirculation is intended for applications where an exhaust duct work is not possible to be installed.
When converted, the hood functions as a recirculating hood rather than an exhaust hood. Fumes and exhaust
from cooking are drawn and filtered by a set of optional charcoal filters. The air is then purified and re-
circulated back within the home.
We recommend to ALWAYS exhaust air outside of the home by employing existing or installing new duct
work, if possible. The hood is most effective and efficient as an exhaust hood. Only when the exhaust option
is not possible should you recourse to converting the hood into a recirculating hood.
When converted to be a recirculating hood, a set of charcoal filters are required on top of its standard
aluminum mesh filter set. Order according to its part number below. The standard aluminum mesh filters are
intended to capture residue from cooking and the optional charcoal filters help to purify fumes exhausted from
cooking for recirculation.
RECIRCULATING KIT (REQUIRED IF NO DUCTING IS USED)
Kit includes charcoal filters, brackets and air diverter plate.
Hood Models Part No. Filters & Brackets in pkg.
ZNA-M90BS ZRC-00NA 3
ZNA-E42BS ZRC-00NA 3
1. Purchase recirculating kit per the part number above
2. Secure air diverter plate to top support frame (FIG. H) Open sides
of air diverter plate should face left and right to direct air through the
louver holes located on the top duct cover. Run 8” ducting from top of
hood and secure to air diverter plate.
3. Remove aluminum mesh filters from hood. Install charcoal filter
brackets inside filter opening. Note: screws to secure charcoal filter
brackets are already pre-installed in the hood and must first be
removed. Clip charcoal filters onto each charcoal filter bracket. (FIG.
H)
4. Re-Install aluminum mesh filters.
5. Turn on charcoal filter change indicator on control panel. (Refer to
details on page 13.) The microprocessor in the controls will indicate
the need to change the charcoal filter after 120 hours of continuous
use. Order replacement charcoal filters per the list below.
Charcoal filters must be replaced after every 120 hours of use (or
approximately every 3 to 4 months based on an average of 1 - 2 hrs.
of daily cooking time).
NOTE: For more details refer to manual included with
recirculation kit.
Charcoal Filter Replacements
Hood Model Part No. Qty to Order
ZNA-M90BS Z0F-C002 3
ZNA-E42BS Z0F-C002 3
DO NOT WASH CHARCOAL FILTERS. Charcoal filters may need
to be changed more often depending on cooking habits.
Installation – Ductless Recirculating
FIG. H

12
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Lights On/Dim/Off
Display (speed level, delay off, filter clean/change,clean air)
Adjust 6 Speed Levels
Power / Delay Off
1
Power / Delay Off Button
Power Button Function
- Button will turn power on and off for entire hood (fan and lights).
- Hood will remember the last speed and light level it was turned off at.
(Example: Press Button to turn off hood when on fan speed 4 and high lights. Press Button again and the hood
will turn back on at speed 4 and high lights level.)
Delay Off Button Function
- Press and hold Button for two seconds and the fan will turn on speed 1. The Graphic will illuminate. After five minutes
the fan and lights will automatically turn off.
- Pressing Button while Delay Off Function is enabled will turn the hood off and cancel the Delay Off Function.
ACT Verification
-
Airflow Control Technology (ACT) allows the installer to set the maximum blower CFM to align with local codes and regulations.
- To verify the maximum blower CFM:
- With hood off, hold the Button for three seconds. The blower CFM will be displayed on the LCD.
2
Speed Selection Button
Fan Speed Decrease Button
- Press this button to decrease fan speed. 6 (burst), 5, 4, 3, 2, 1.
- If fan is On Speed 1 and this button is pressed, fan will power Off.
Fan Speed Increase Button
- Press this button to increase fan speed. Fan On, 1, 2, 3, 4, 5, 6 (burst).
- If hood is Off and this button is pressed, fan will turn On Speed 1.
Burst Mode
- This speed level is intended to be used as a quick burst of air extraction when excess cooking fumes and smoke are
generated. After 3 minutes the fan will automatically change to Speed 5.
3
Lights Button
- Lights are two levels, High and Low.
- From off, press one time for High. LCD will show the words “
lights hi ” for 2 seconds then fade away.
- Press again for Low. LCD will display the words “
lights lo ” for 2 seconds then fade away.
- Press again to power lights off.
clean mesh filter
clean air
replace charcoal filter
Features & Controls - Touch Controls

13
Mesh Filter Clean Indicator (always enabled)
- After 30 hours of fan usage the Graphic and words “clean mesh filter” will illuminate indicating it is time to clean
the mesh filters. Graphic and words will remain illuminated until reset.
- To reset: With hood off, hold the Button for three seconds, after three seconds the Graphic and words “clean mesh
filter” will turn off and the 30 hour timer will reset.
Charcoal Filter Replace Indicator (disabled by default, must be enabled if recirculating hood)
- To enable Charcoal Filter Replacement Function:
- With hood off, hold Button and Button simultaneously for three seconds. The Graphic will illuminate for
three seconds indicating the Charcoal Filter Replacement Function is enabled.
- To disable Charcoal Filter Replacement Function:
- With hood off, hold Button and Button simultaneously for three seconds. The Graphic will be
illuminated then turn off indicating the Charcoal Filter Replacement Function is disabled.
- After 120 hours of fan usage the Graphic and words “replace charcoal filter” will illuminate indicating it is time to
replace the charcoal filter. Graphic and words will remain illuminated until reset.
- To reset: With hood off, hold the Button for three seconds, after three seconds the Graphic and words “replace
charcoal filter” will turn off and the 120 hour timer will reset.
Clean Air Indicator
- Clean Air is a feature that turns the fan on every 4 hours for 10 minutes to remove stagnant air in the kitchen.
- To enable Clean Air Function:
- With hood off, hold the Button and Button simultaneously for three seconds. The Graphic and
words “clean air” will illuminate and the fan will turn on speed 1 for 10 minutes. After 10 minutes the fan
will turn off and the 4 hour timer will begin.
- Graphic will remain on when Clean Air Function is enabled, even if fan is not on.
- To disable Clean Air Function:
- With hood off, hold the Button and Button simultaneously for three seconds until Graphic
turns off.
- When the Clean Air Function is enabled the fan will turn on speed 1 for 10 minutes every 4 hours of non fan usage. After 10
minutes the fan will turn off and the 4 hour timer will reset.
- If the user changes the fan speed while the Clean Air Function is in use, the words “clean air” will turn off but the Graphic
will remain illuminated. If the user presses the Button at any time the 4 hour clean air timer will reset.
Features & Controls - User Interface

14
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SURFACE MAINTENANCE:
Clean the hood surface periodically with hot soapy water and clean cotton cloth. Do not use corrosive or
abrasive detergent or steel wool/scouring pads which will scratch and damage surface.
For heavier soil use liquid degreaser.
After cleaning it is recommended that you use non-abrasive stainless steel polish/cleaners, to polish and
buff out the stainless luster and grain. Always scrub lightly, with clean cotton cloth, and with the grain.
Do not use any product containing chlorine bleach. Do not use “orange” cleaners.
Aluminum Mesh Filters
The aluminum mesh filters installed by the factory are intended to filter out residue and grease from
cooking. They need not be replaced on a regular basis but are required to be kept clean.
Remove and clean by hand or in dishwasher on low heat. Spray degreasing detergent and leave to soak if
heavily soiled.
Dry filters and re-install before using hood.
Removing Aluminum Mesh Filters
1. Push in on spring loaded handle
2. Pull down on filter hande to remove filter
Maintenance – Hood and Filter Cleaning

15
Troubleshooting
TROUBLESHOOTING PROCEDURES FOR NAPOLI ISLAND
Issue Cause What to do
After installation,
the unit doesn’t
work.
1. The power source is not turned ON. 1. Make sure the circuit breaker and the unit’s
power is ON.
2. The power line and the cable locking connector
is not connecting properly.
2. Check the power connection with the unit is
connected properly.
3. The wires on the control board are loose. 3. Make sure the wires on the control board are
connected properly.
4. The switch board and control board wirings are
disconnected.
4. Make sure the wirings between the switch
board and control board are connected
properly.
5. The switch board or control board is defective. 5. Change the switch board or control board.
Light works, but
blower is not
turning.
1. The blower cable is disconnected. 1. Check all wirings from the blower to be sure
all cables are connected properly.
2. The blower is defective, possibly seized. 2. Change the blower.
3. The thermally protected system detects if the
blower is too hot to operate and shuts the blower
down.
3. The blower will function properly after the
thermally protected system cool down.
4. The switch board or control board is defective. 4. Change defective part.
The unit is
vibrating.
1. The motor is not secure in place. 1. Tighten the motor in place.
2. Damaged blower wheel. 2. Replace the blower.
3. The hood is not secured in place. 3. Check the installation of the hood.
The unit is
whistling.
1. The filter is not in the correct position. 1. Adjust the filters until the whistling stops.
2. The duct pipe connections are not sealed or
connected properly.
2. Check the duct pipe connections to be sure all
connections are sealed properly.
The blower is
working, but the
lights are not.
1. Defective LED bulb. 1. Change the LED bulb.
2. The LED bulb wire is loose. 2. Check LED wire connections at the control
board and the LED light bulbs. Reconnect any
loose wires.
The speed levels
of the blower
sound the same.
1. Using the wrong size of ducting. 1. Change the ducting to at least 8” or higher.
2. ACT enabled blower CFM set to 290 or 440
CFM.
2. Noise level distinction between some speeds
may be minimal when ACT enabled blower is
set to 290 or 440 CFM.
The hood is
not venting out
properly.
1. The hood might be hanging too high from the
cook top.
1. Adjust the distance between the cook top and
the bottom of the hood within 26” and 34”
range.
2. The wind from the opened windows or opened
doors in the surrounding area are affecting the
ventilation of the hood.
2. Close all the windows and doors to eliminate
the outside wind flow.
3. Blockage in the duct opening or ductwork. 3. Remove all the blocking from the duct work or
duct opening.
4. The direction of duct opening is against the wind. 4. Adjust the duct opening direction.
5. Using the wrong size of ducting. 5. Change the ducting to at least 8” or higher for
the internal blower.
Mesh Filter is
vibrating.
1. Mesh filter is loose. 1. Make sure the metal clips in the handle are
not stuck. Or replace the mesh filter.
2. Filter spring clip is loose or broken. 2. Uninstall and reinstall filter, push up on filter
latch. Replace mesh filter if needed.

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Fan Curve Diagrams
Airflow Control Technology (ACT)
Some local codes limit the maximum amount of CFM a range hood can move. ACT allows you to
control the maximum blower CFM of hoods with Zephyr’s DCBL Suppression System without the need
for expensive make up air kits. ACT enables the installer to easily set the maximum blower speed to
one of three most commonly specified CFM levels; 590, 440 or 290 CFM. The usage of ACT may not be
necessary for your installation. Please check your local codes for CFM restrictions.
By default the maximum blower CFM is set to 715.
To verify if your installer enabled ACT; With hood off, press and hold the power button for three seconds.
Blower CFM will be displayed on the LCD screen. There should also be a foil label located inside the
hood body near the wiring diagram that indicates the blower CFM.

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Fan Curve Diagrams

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Wiring Diagram
THERMALLY PROTECTED
Fan: Max. 203W
Lamp: Max. 3Wx4
Total: Max. 215W @ 3.5A
Voltage: 120V 60Hz
Model: ZNA-M90BS/E42BS
Power consumption
U
U
V
W
V
W
AC-N AC-L
ON/OFF DOWN UP LAMP
5A 250V
Power consumption shown for default 715 CFM blower configuration
ACT 590 CFM - Fan Max. 130W @ 1.8A
ACT 440 CFM - Fan Max. 70W @ 1A
ACT 290 CFM - Fan Max. 35W @ .55A