EcoNet A2024 Manuale utente

VARIABLE SPEED R-410A

AIR CONDITIONING

OUTDOOR UNITS

92-104921-12-00 (12/15) Printed in USA

[ ] indicates metric conversions.

Do not destroy this manual.

Please read carefully and

keep in a safe place for future

reference by a serviceman.

WARNING

THESE INSTRUCTIONS

ARE INTENDED AS AN AID

TO QUALIFIED, LICENSED

SERVICE PERSONNEL FOR

PROPER INSTALLATION,

ADJUSTMENT, AND

OPERATION OF THIS UNIT.

READ THESE INSTRUCTIONS

THOROUGHLY BEFORE

ATTEMPTING INSTALLATION

OR OPERATION. FAILURE

TO FOLLOW THESE

INSTRUCTIONS MAY RESULT

IN IMPROPER INSTALLATION,

ADJUSTMENT, SERVICE,

OR MAINTENANCE

POSSIBLY RESULTING IN

FIRE, ELECTRICAL SHOCK,

PROPERTY DAMAGE,

PERSONAL INJURY, OR

DEATH.

(-)A20 (20 SEER) EQUIPPED WITH

ECONET™ COMMUNICATIONS

WARNING:

RECOGNIZETHIS SYMBOL

AS AN INDICATION OF

IMPORTANT SAFETY

INFORMATION

ST-A1226-01-00

Enabled

Contents

Important

Safety Information �� 3

General Information�� 4-7

Checking Product Received ��4

Application ��4

Electrical and Physical Data�� 5-6

Specifications�� 6-7

Proper Installation ��7

Installation��8-22

Choosing a Location��8-10

Operational Issues��8

Corrosive Environment ��8

For Units With

Space Limitations��9

Customer Satisfaction Issues ��9

Unit Mounting��9

Factory-Preferred

Tie-Down Method��9

Snow Depth Table ��10

Tools and Refrigerant ��11

Tools Required for Installing and

Servicing R-410A Models ��11

Specifications of R-410A ��11

Quick-Reference

Guide for R-410A ��11

Replacement Units ��12

Indoor Coil ��12

Location��12

Interconnecting Tubing�� 12-22

Refrigerant Level Adjustment��12

Interconnecting Tubing and

Fitting Losses ��13

Liquid Line Selection��13

Long Line Set Applications ��14

Oil Level Adjustments for Long Line��14

Suction Line Selection ��15

Refrigerant Migration During Off Cycle��15

Tubing Installation ��20

Tubing Connections ��21

Leak Testing ��22

Wiring ��23-26

EcoNet™ Control Communications��23

Control Wiring ��23

EcoNet™ Control Board

Communication Wiring�� 23

Conventional 24VAC Thermostat Control Wiring�� 24

Conventional 24VAC Mode of Operation��24

Typical Noncommunicating Thermostat

Wiring Diagrams��24

Power Wiring ��25

Grounding��26

Start-Up ��27-32

Start-Up��27

Checking Airflow ��27

Evacuation Procedure �� 28

Final Leak Testing��28

Checking Refrigerant Charge �� 29-32

Charging Units

With R-410A Refrigerant ��29

Confirm ID Airflow and Coils Are Clean��29

Measurement Device Setup��29

Charging by Weight��29

Setting Compressor Speed��30

Gross Charging by Pressures ��30

Final Charge by Subcooling ��31

Finishing Up Installation ��31

Components and Controls��33-51

Compressor Stator Heat (CSH) ��33

Stator Heat Operation ��33

High- and Low-Pressure

Controls (HPC and SPT)��33

Accumulator �� 34

Outdoor Fan Motors�� 34

Outdoor Fan Blades�� 34

Alternate Suction LINE THERMISTOR �� 35

Coil Thermistor�� 35

Compressor Sump Thermistor�� 35

Suction Pressure Transducer (SPT) �� 36

Discharge Line Thermistor �� 36

Power Inverter Compressor Controls �� 36

Choke/Inductor�� 37

Filter & Ferrite Rings �� 37

EcoNet™ Variable Speed

Unitary Control �� 38

Test and SW2 Buttons ��38

Memory Card ��39

Factory Programmed Superheat��39

Compressor Operation��40

Active Compressor Protection Mode��42

Default Operations Upon Component Failure��49

Test and Fault Recall Modes��49

Agency Test Mode Instructions�� 50

Accessories ��52

Air Conditioner Thermostat Warning Light Kit �� 52

Communicating 2 Wire Kit �� 52

Diagnostics �� 53-73

Replacement of EcoNet™ Variable Speed

Unitary Control Board �� 53

ICC Diagnostic Codes��54-57

Electrical, Mechanical Checks Flowcharts ��58-61

General Troubleshooting Chart �� 62

Service Analyzer Charts ��63-70

ICC Diagnostic Codes��71-72

Cooling and Heating Mode Troubleshooting Tips �� 73

Wiring Diagram�� 74

2

CONTENTS

Safety

3

IMPORTANT SAFETY INFORMATION

WARNINGS:

• These instructions are intended as an aid to

qualified, licensed service personnel for proper

installation, adjustment, and operation of this

unit� Read these instructions thoroughly before

attempting installation or operation� Failure to

follow these instructions may result in improper

installation, adjustment, service, or maintenance

possibly resulting in fire, electrical shock,

property damage, personal injury, or death.

• The unit must be permanently grounded. Failure

to do so can cause electrical shock resulting in

severe personal injury or death.

• Turn off electric power at the fuse box or service

panel before making any electrical connections.

• Complete the ground connection before making

line voltage connections. Failure to do so can

result in electrical shock, severe personal injury,

or death.

• Disconnect all power to unit before starting

maintenance. Failure to do so can cause

electrical shock resulting in severe personal

injury or death.

• Never assume the unit is properly wired and/or

grounded. Always test the unit cabinet with a

noncontact voltage detector available at most

electrical supply houses or home centers before

removing access panels or coming into contact

with the unit cabinet.

• Do not use oxygen to purge lines or pressurize

system for leak test. Oxygen reacts violently with

oil, which can cause an explosion resulting in

severe personal injury or death.

• The top of the scroll compressor shell is hot�

Touching the compressor top may result in serious

personal injury�

• The manufacturer’s warranty does not cover

any damage or defect to the unit caused by the

attachment or use of any components, accessories,

or devices (other than those authorized by the

manufacturer) into, onto, or in conjunction with

the air conditioner� You should be aware that the

use of unauthorized components, accessories,

or devices may adversely affect the operation

of the air conditioner and may also endanger

life and property. The manufacturer disclaims

any responsibility for such loss or injury resulting

from the use of such unauthorized components,

accessories, or devices�

CAUTIONS:

• R-410A systems operate at approximately 60%

higher pressures (1�6 times) than R-22 systems� Do

not use R-22 service equipment or components on

R-410A equipment� Use appropriate care when using

this refrigerant� Failure to exercise care may result in

equipment damage or personal injury�

• Only match this outdoor unit with a matched indoor

coil or air handler approved for use with this outdoor

unit per the unit manufacturer’s specification sheet�

The use of unmatched coils or air handler will likely

result in a charge imbalance between the cooling

and heating modes which can cause unsatisfactory

operation including a high-pressure switch lockout

condition�

• Only use indoor coils approved for use on R-410A

systems� An R-22 coil will have a TXV or fixed

restrictor device that is not designed to operate

properly in an R-410A system and will result in

serious operational issues� The R-22 coil could also

contain mineral oil which is incompatible with the

POE oil used in R-410A systems and could result in

reliability issues with the compressor and TXVs�

• When coil is installed over a finished ceiling and/or

living area, it is required that a secondary sheet metal

condensate pan be constructed and installed under

the entire unit� Failure to do so can result in property

damage�

• The compressor has an internal overload protector�

Under some conditions, it can take up to 2 hours for

this overload to reset� Make sure overload has had

time to reset before condemning the compressor�

• UNIT MAY START SUDDENLY AND WITHOUT

WARNING� A flashing red light on the air conditioner/

defrost control indicates a call for unit operation is

present at the air conditioner/defrost control� The air

conditioner/defrost control will attempt to start unit

after the anti-short cycle time expires, when a high

or low pressure control automatically resets, or when

the air conditioner/defrost control exits the lockout

mode as the temperature rises above 5°F�

4

GENERAL INFORMATION

WARNING:

Improper installation, or installation not made in

accordance with these instructions, can result

in unsatisfactory operation and/or dangerous

conditions and can cause the related warranty

not to apply.

The RP series of air conditioners are designed to

operate with standard 24 VAC thermostats and air

handlers or gas furnaces�

This installation instruction manual contains

complete instructions for installation and setup

using conventional 24 VAC controls� Please refer

to the manufacturer’s specification sheets for

complete performance data, thermostat, and

accessory listings�

The information contained in this manual has

been prepared to assist in the proper installation,

operation, and maintenance of the air conditioning

system�

Read this manual and any instructions packaged

with separate equipment required to make up the

system prior to installation� Homeowner should

retain this manual for future reference�

To achieve optimum efficiency and capacity,

the matching indoor cooling coils listed in the

manufacturer’s specification sheet must be used

for this model air conditioner�

Checking Product Received

Upon receiving unit, inspect it for any shipping

damage� Claims for damage, either apparent or

concealed, should be filed immediately with the

shipping company� Check model number, electrical

characteristics, and accessories to determine if they

are correct� Check system components (indoor coil,

outdoor unit, air handler/furnace, etc�) to make sure

they are properly matched�

Application

Before specifying any air conditioner equipment,

a survey of the structure and a heat loss and

heat gain calculation must be made� A heat loss

calculation involves identifying all surfaces and

openings that lose heat to the surrounding air

and quantifying that heat loss� A cooling heat

gain calculation makes similar measurements

and determines the amount of heat needed

to be removed� A heat gain calculation also

calculates the extra heat load caused by sunlight

and by humidity removal� These factors must be

considered before selecting an air conditioner

system to provide year-round comfort� The Air

Conditioning Contractors of America (ACCA)

J Manual method of load calculation is one

recognized procedure for determining the heating

and cooling load�

After the proper equipment combination has

been selected, satisfying both sensible and

latent requirements, the system must be properly

installed� Only then can the unit provide the

comfort it was designed to provide�

There are several factors that installers must

consider�

• Outdoor unit location

• Indoor unit blower speed and airflow

• Proper equipment evacuation

• Supply and return air duct design and sizing

• Refrigerant charge

• System air balancing

• Diffuser and return air grille location and sizing

General Information

5

GENERAL INFORMATION

General Information

Electrical and Physical Data

VARIABLESPEEDR410AAIR

CONDITIONINGOUTDOORUNITS

Startwith921050740502markupsandusethefollowinginformationasneeded.

FrontPage

Changethetitletoalignwiththetitleabove.

Change“()P17(17SEER)”to()A20(20SEER)

Contentspg2

Updateasneeded.

ElectricalandPhysicalData

Rev.11/15Electrical

Model

Number

()A20

Phase

Frequency(Hz)

Voltage(Volts)

CompressorFanMotor

FullLoad

Amperes

(FLA)

FuseorHACRCircuit

Breaker

RatedLoad

Amperes

(RLA)

Locked

Rotor

Amperes

(LRA)

Minimum

Amperes

Maximum

Amperes

24 160208/23015.0/15.0351.42535

36 160208/23020.1/20.1353.53545

48 160208/23032.0/32.0505.36070

60 160208/23034.1/34.1505.36080



Rev.11/15Physical

Model

Number

()A20

OutdoorCoilRefrig.Per

CircuitOz.

[g]

Weight

FaceArea

Sq.Ft.[m²]

No.RowsCFM[L/s]NetLbs.

[kg]

Shipping

Lbs.[kg]

2422.23 1 3328/1796/1264148(4195)198206

3622.34 1 4313/2065/1050193.6

(5488)

236244

4832.45 1 6242/3212/1853196(5556)255263

6032.45 2 6173/2932/1466376(10659)300307

GeneralInformation

2ndcharacter:Changefrom“P”to“A”andchangethedescriptionfrom“HeatPump”to“AIR

CONDITIONER”

6

“ L”

“W”

“H”

A

I

R

D

I

S

C

H

A

R

G

E

ALLOW 60” [1524mm]

OF CLEARANCE

AIR INLET LOUVERS ALLOW

6” [152mm] Min. OF CLEARANCE ALL SIDES

12” [305mm] RECCOMMENDED

SERVICE PANELS/

INLET CONNECTIONS / HIGH & LOW

VOLTAGE ACCESS

ALLOW 24”[ 610 mm] OF CLEARANCE

ST-A1226-02-00

ALLOW 60" [1524mm] OF

CLEARANCE

SERVICE PANELS/

INLET CONNECTIONS /

HIGH & LOW VOLTAGE

ACCESS ALLOW

24" [610 mm] OF

CLEARANCE

AIR INLET LOUVERS ALLOW

6" [152 mm] OF CLEARANCE ALL SIDES

12" [305 mm] RECOMMENDED

R A 20 36 A J V C A

MINOR SERIES

Z

TYPE

V - INVERTER

VOLTAGE

J = 1 PH, 208-230/60

MAJOR SERIES

CAPACITY

24 = 24000 BTU/HR [7.03 kW]

36 = 36000 BTU/HR [10.55 kW]

48 = 48000 BTU/HR [14.07 kW]

60 = 60000 BTU/HR [17.58 kW]

20 SEER

AIR CONDITIONER

BRAND

CONTROLS

C - COMMUNICATING

GENERAL INFORMATION

General Information

7

GENERAL INFORMATION

Proper Installation

Proper sizing and installation of this equipment is

critical to achieve optimal performance� Use the

information in this Installation Instruction Manual

and reference the applicable manufacturer’s

specification sheet when installing this product�

IMPORTANT: This product has been

designed and manufactured to meet ENERGY

STAR criteria for energy efficiency when matched

with appropriate indoor components� However,

proper refrigerant charge and proper airflow are

critical to achieve rated capacity and efficiency�

Installation of this product should follow the

manufacturer’s refrigerant charging and airflow

instructions� Failure to confirm proper charge

and airflow may reduce energy efficiency and

shorten equipment life�

MATCH ALL COMPONENTS:

• OUTDOOR UNIT

• INDOOR COIL

• INDOOR AIR HANDLER/FURNACE

• REFRIGERANT LINES

• INDOOR THERMOSTAT

Speciﬁcations

DIMENSIONAL DATA

(-)17 24

35 (889) 35 (889) 45 (1143)39 (991)

33.75 (857) 33.75 (857) 35.75 (908)35.75 (908)

Height “H” inches (mm)

Length “L” inches (mm)

Width “W” inches (mm)

36 6048

General Information

DimensionalData

()A2024364860

Height“H”inches(mm)39(991)39(991)51(1295)51(1295)

Length“L”inches(mm)33.75(857)33.75(857)35.75(908)35.75(908)

Width“W”inches(mm)33.75(857)33.75(857)35.75(908)35.75(908)



InterconnectingTubing

Pg14.Replacethetablewiththefollowing:



ODModel

Compressor

NameplateOil

Charge(oz)

()A2024

ZPV0212EZE9130

40

()A2036

()A2048

ZPV0342EZE9130

40

()A2060

ZPV038CEZE9130

40



Replacetable2onpg18withthebelowtable.



Replacetable2onpg19withthebelowtable.



ControlWiring

Modifythewiringdiagramsonpage24and25withtheattachedmarkup.(RemovingtheWandB

terminals.

WiringDiagram

Replacethewiringdiagramonpage77with901012293901.

8

INSTALLATION

Choosing a Location

IMPORTANT: Consult local and

national building codes and ordinances for special

installation requirements� Following location

information will provide longer life and simplified

servicing of the outdoor air conditioner�

NOTICE: These units must be installed

outdoors� No ductwork can be attached, or

other modifications made, to the discharge grille�

Modifications will affect performance or operation�

Operational Issues

IMPORTANT: Locate the unit

in a manner that will not prevent, impair, or

compromise the performance of other equipment

installed in proximity to the unit� Maintain all

required minimum distances to gas and electric

meters, dryer vents, and exhaust and inlet

openings� In the absence of national codes or

manufacturers’ recommendations, local code

recommendations and requirements will take

precedence�

• Refrigerant piping and wiring should be properly

sized and kept as short as possible to avoid

capacity losses and increased operating costs�

• Locate the unit where water runoff will not create

a problem with the equipment� Position the unit

away from the drip edge of the roof whenever

possible� Units are weatherized, but can be

affected by the following:

• Water pouring into the unit from the junction

of rooflines, without protective guttering� Large

volumes of water entering the air conditioner

while in operation can impact fan blade or

motor life, and coil damage may occur to an

air conditioner if moisture cannot drain from

the unit under freezing conditions�

• Freezing moisture or sleeting conditions can

cause the cabinet to ice-over prematurely and

prevent air conditioner operation, requiring

backup heat, which generally results in less

economical operation�

• Closely follow the clearance recommendations

on page 8�

• 24" [61.0 cm] to the service panel access

• 60" [152.4 cm] above air conditioner fan

discharge (unit top) to prevent recirculation

• 6" [15.2 cm] to air conditioner coil grille air

inlets

with 12" [30.5 cm] minimum recommended

Corrosive Environment

The metal parts of this unit may be subject to

rust or deterioration if exposed to a corrosive

environment� This oxidation could shorten the

equipment’s useful life�

Corrosive elements include, but are not limited to,

salt spray, fog or mist in seacoast areas, sulphur or

chlorine from lawn watering systems, and various

chemical contaminants from industries such as

paper mills and petroleum refineries�

If the unit is to be installed in an area where

contaminants are likely to be a problem, special

attention should be given to the equipment

location and exposure�

• Avoid having lawn sprinkler heads spray directly

on the unit cabinet�

• In coastal areas, locate the unit on the side of

the building away from the waterfront�

• Shielding provided by a fence or shrubs may

give some protection, but cannot violate

minimum airflow and service access clearances�

• Elevating the unit off its slab or base enough to

allow air circulation will help avoid holding water

against the base pan�

WARNING: Disconnect all power

to unit before starting maintenance� Failure to do

so can cause electrical shock resulting in severe

personal injury or death�

Regular maintenance will reduce the buildup of

contaminants and help to protect the unit’s finish�

• Frequent washing of the cabinet, fan blade, and

coil with fresh water will remove most of the salt

or other contaminants that build up on the unit�

• Regular cleaning and waxing of the cabinet with

a good automobile polish will provide some

protection�

• A good liquid cleaner may be used several times

a year to remove matter that will not wash off

with water�

Location

9

Location

INSTALLATION

Choosing a Location (cont�)

For Units With Space

Limitations

In the event that a space limitation exists, we will

permit the following clearances:

Single-Unit Applications: Clearances below 6"

[15.2 cm] will reduce unit capacity and efficiency.

Do not reduce the 60" [152.4 cm] discharge or the

24" [61.0 cm] service clearances.

Multiple-Unit Applications: When multiple

condenser grille sides are aligned, a 6" [15.2

cm] clearance is recommended for 1.5 and 2

ton models and 9" [22.9 cm] for 2.5 ton to 5 ton

models� Two combined clearances below the

minimum will reduce capacity and efficiency� Do

not reduce the 60" [152.4 cm] discharge or 24"

[61.0 cm] service clearances.

Customer Satisfaction Issues

• The air conditioner should be located away from

the living, sleeping, and recreational spaces

of the owner and those spaces on adjoining

property�

• To prevent noise transmission, the mounting pad

for the outdoor unit should not be connected to

the structure and should be located a sufficient

distance above grade to prevent ground water

from entering the unit�

Unit Mounting

WARNING: Secure an elevated unit

and its elevating stand in order to prevent tipping�

Failure to do so may result in severe personal

injury or death�

Elevation of Unit

If elevating the air conditioner, either on a flat roof

or on a slab, observe the following guidelines�

• If elevating a unit on a flat roof, use 4" x 4"

[10.2 cm x 10.2 cm] or equivalent stringers

positioned to distribute unit weight evenly and

prevent noise and vibration�

• Where snowfall is anticipated, raise the unit

above the base pad to prevent ice buildup and

coil damage� Mount the unit high enough to be

above the average accumulated area snowfall�

See “Ground Snow Depth” chart on page 10 for

representative snow depths�

NOTICE: Do not block drain openings on

bottom of unit�

• If unit must be elevated because of anticipated

snowfall, secure unit and elevating stand such

that unit and/or stand will not tip over or fall off�

Keep in mind that someone may try to climb on

unit�

Factory-Preferred Tie-Down

Method for High Wind or

Seismic Loads

IMPORTANT: The manufacturer-

approved/recommended method is a guide to

securing equipment for wind and seismic loads�

Other methods might provide the same result, but

the manufacturer method is the only one endorsed

by the manufacturer for securing equipment where

wind or earthquake damage can occur� Additional

information is available in the PTS (Product

Technical Support) section of the manufacturer’s

Web sites MyRheem�com, or MyRuud�com and

can be found as a listing under each outdoor

model� If you do not have access to this site, your

distributor can offer assistance�

SERVICE PANELS/

INLET CONNECTIONS

/ HIGH & LOW

VOLTAGE ACCESS

ALLOW 24” [610 mm] OF

CLEARANCE

ALLOW 60” [1524 mm]

OF CLEARANCE

AIR INLET LOUVERS ALLOW

6” [152 mm] Min. OF

CLEARANCE ALL SIDES

12” [305 mm] RECOMMENDED

ST-A1226-04-00

6" MIN. (152 mm) FOR 1.5 & 2 TON

9" MIN. (229 mm) FOR 2.5-5 TON

24" MIN. (610 mm)

ST-A1226-03-00

ELEVATE ABOVE

ANTICIPATE HIGH

SNOW FALL

DO NOT BLOCK

OPENINGS

IN BASE PAN

BASE PAD

(CONCRETE OR OTHER SUITABLE

MATERIAL)

10

Location

INSTALLATION

Choosing a Location (cont�)

GROUND SNOW DEPTH – INCHES

ALABAMA INDIANA MINNESOTA NEW MEXICO PENNSYLVANIA VIRGINIA

Huntsville 7 Evansville 12 Duluth 64 Albuquerque 4 Allentown 23 Dulles Airport 19

ARIZONA Fort Wayne 17 International Falls 43 Clayton 10 Erie 19 Lynchburg 16

Flagstaff 48 Indianapolis 21

Minneapolis/St. Paul

50 Roswell 8 Harrisburg 23 National Airport 18

Prescott 3 South Bend 44 Rochester 50 NEWYORK Philadelphia 16 Norfolk 9

Winslow 7 IOWA St. Cloud 53 Albany 25 Pittsburgh 22 Richmond 12

ARKANSAS Burlington 17 MISSISSIPPI Binghamton 35 Scranton 16 Roanoke 17

Ft. Smith 5 Des Moines 22 Jackson 3 Buffalo 42 Williamsport 20 WASHINGTON

Little Rock 6 Dubuque 38 MISSOURI

NYC – Kennedy Airport 18

RHODE ISLAND Olympia 24

CALIFORNIA Sioux City 33 Columbia 21

NYC – LaGuardia Airport 18

Providence 21 Quillayute 24

Blue Canyon 25 Waterloo 36 Kansas City 18 Rochester 38 SOUTH CAROLINA Seattle-Tacoma 14

Mt. Shasta 69 KANSAS St. Louis 16 Syracuse 35 Columbia 12 Spokane 41

COLORADO Concordia 23 Springﬁeld 14 NORTH CAROLINA Greenville 4 Stampede Pass 51

Alamosa 15 Dodge City 12 MONTANA Asheville 12 SOUTH DAKOTA Yakima 25

Colorado Springs 14 Goodland 14 Billings 17 Cape Hattaras 5 Aberdeen 42 WESTVIRGINIA

Denver 15 Topeka 19 Glasgow 17 Charlotte 10 Huron 43 Beckley 51

Grand Junction 16 Wichita 11 Great Falls 16 Greensboro 11 Rapid City 14 Charleston 20

Pueblo 7 KENTUCKY Havre 24 Raleigh-Durham 10 Sioux Falls 38 Elkins 21

CONNECTICUT Covington 12 Helena 18 Wilmington 9 TENNESSEE Huntington 15

Bridgeport 23 Lexington 12 Kalispell 53 Winston-Salem 17 Bristol 8 WISCONSIN

Hartford 29 Louisville 11 Missoula 23 NORTH DAKOTA Chattanooga 6 Green Bay 36

New Haven 15 MAINE NEBRASKA Bismarck 25 Knoxville 8 La Crosse 32

DELAWARE Caribou 100 Grand Island 30 Fargo 34 Memphis 5 Madison 32

Wilmington 13 Portland 62 Lincoln 20 Williston 25 Nashville 8 Milwaukee 32

GEORGIA MARYLAND Norfolk 29 OHIO TEXAS WYOMING

Athens 5 Baltimore 17 North Platte 15 Akron-Canton 15 Abilene 6 Casper 10

Macon 8 MASSACHUSETTS Omaha 20 Cleveland 16 Amarillo 10 Cheyenne 15

IDAHO Boston 30 Scottsbluff 11 Columbus 10 Dallas 3 Lander 20

Boise 6 Nantucket 18 Valentine 22 Dayton 11 El Paso 5 Sheridan 25

Lewiston 9 Worcester 35 NEVADA Mansﬁeld 17 Fort Worth 6

0 Pocatello 7 MICHIGAN Elko 20 Toledo Express 8 Lubbock 10

ILLINOIS Alpena 53 Ely 9 Youngstown 12 Midland 2

Chicago O’Hare 18 Detroit City 9 Reno 11 OKLAHOMA San Antonio 3

Chicago 22 Detroit Airport 17 Winnemucca 6 Oklahoma City 5 Wichita Falls 5

Moline 17

Detroit – Willow Run

21 NEW HAMPSHIRE Tulsa 8 UTAH

Peoria 16 Flint 28 Concord 66 OREGON Milford 16

Rockford 25 Grand Rapids 37 NEW JERSEY Burns City 24 Salt Lake City 8

Springﬁeld 23 Houghton Lake 56 Atlantic City 11 Eugene 17 Wendover 3

Lansing 42 Newark 15 Medford 8 VERMONT

Marquette 53 Pendleton 11 Burlington 37

Muskegon 43 Portland 10

Sault Ste. Marie 80 Salem 7

NOTICE:

Local records and experience must be considered when establishing the unit installation height� There is a 2% probability that

the ground snow depth shown in this table will be exceeded annually� Drifts have not been considered� This data represents 184

National Weather Service locations at which measurements are made and assumes a nationwide snow density of 12 lb�/ft�

3

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