DURASTAR DRAH1T Manuel utilisateur

AIR HANDLERS

FEATURING INDUSTRY STANDARD R-410A REFRIGERANT:

DRAH1T

INSTALLATIONINSTRUCTIONS

92-20521-124-00

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.

ACCREDITED

WARNING

TABLE OF CONTENTS

1.0 SAFETY INFORMATION ................................................................................. 4

2.0 GENERAL INFORMATION ............................................................................. 6

2.1 Important Information About Efciency & Indoor Air Quality ........................ 6

2.2 Checking Product Received ......................................................................... 7

2.3 Model Number Nomenclature ...................................................................... 7

2.4 Available Models .......................................................................................... 8

2.5 Dimensions & Weight ................................................................................... 9

2.5.1 DRAH1T Models .......................................................................... 9

2.6 Importance of Proper Indoor/Outdoor Match-Ups ........................................ 10

2.7 Importance Of Quality Installation ................................................................ 10

3.0 INSTALLATION ............................................................................................... 11

3.1 Tools and Refrigerant ................................................................................... 11

3.1.1 Tools Required For Installation and Servicing R-410A Models .............. 11

3.1.2 Specications of R-410A ....................................................................... 11

3.1.3 Quick-Reference Guide for R-410A ....................................................... 11

3.2 Applications and Orientation ........................................................................ 12

3.2.1 Vertical Upow & Horizontal Left Discharge .......................................... 12

3.2.2 Vertical Downow & Horizontal Right Discharge ................................... 12

3.2.3 Installation in an Unconditioned Space ................................................. 14

3.2.4 Installation in Mobile/Manufactured Homes ........................................... 15

3.2.5 Installation in Corrosive Environments .................................................. 16

3.2.6 Supporting Air-Handler in Horizontal Applications ................................. 16

3.3 Auxiliary Overow Pan ................................................................................. 16

3.4 Clearances ................................................................................................... 16

3.5 Duct Flanges ................................................................................................ 17

3.6 Ductwork ...................................................................................................... 17

3.7 Return Air Filter ............................................................................................ 18

3.8 Orice Size ................................................................................................... 18

3.9 Refrigerant Line Connections & Charging ................................................... 18

3.9.1 Preparation ............................................................................................ 18

3.9.2 Liquid Line Filter Drier ........................................................................... 18

3.9.3 Brazing .................................................................................................. 19

3.9.4 Leak Testing .......................................................................................... 19

3.9.5 Evacuation ............................................................................................. 19

3.9.6 Refrigerant Charging ............................................................................. 19

3.10 TXV Sensing Bulb Attachment ................................................................... 19

3.11 Condensate Drain ...................................................................................... 20

3.12 Thermostat ................................................................................................. 21

3.13 Electrical Wiring ......................................................................................... 21

3.13.1 Conguring Unit for 208 Volt Power .................................................... 22

3.13.2 Grounding ............................................................................................ 22

3.13.3 Power Wiring ....................................................................................... 22

3.13.4 Cooper Wire Size - AWG. (3% Voltage Drop) ..................................... 22

3.13.5. Electrical Data - Blower Motor Only - Without Electrical Heat ............ 22

3.13.5.1 DRAH1T ......................................................................................... 22

3.13.6 Electrical Data - With Electric Heat ...................................................... 23

3.13.6.1 DRAH1T ......................................................................................... 26

3.13.7 Electric Heater Kit Supplemental Information ...................................... 27

3.13.8 Control Wiring ...................................................................................... 27

3.13.9 Thermostat & Control Wiring Connections .......................................... 27

3.14 Airow ......................................................................................................... 27

TABLE OF CONTENTS (continued)

3.14.1 General Airflow Operating Limits ......................................................... 28

3.14.2 Selecting Indoor Blower Motor Speed ................................................. 28

3.14.2.1 DRAH1T Models (Constant Torque ECM Motor) ............................ 28

3.14.3 Airow Performance Data .................................................................... 29

3.14.3.1 DRAH1T (Constant Torque Motor) - 115/208/240/480V ................. 29

4.0 START-UP ....................................................................................................... 33

4.1 Pre-Start Checklist ....................................................................................... 33

4.2 System Start-Up and Operational Check-Out .............................................. 33

4.3 Sequence of Operation ................................................................................ 33

4.3.1 Cooling Mode ........................................................................................ 33

4.3.2 Electrical Heat Mode ............................................................................. 34

4.3.3 Heat Pump Heating Mode ..................................................................... 34

4.3.4 Supplemental Electric Heat During Defrost ........................................... 34

4.3.5 Emergency Heat (Heat Pump) .............................................................. 34

4.3.6 Thermostat Fan Setting ......................................................................... 34

4.4 Correcting Electric Heat kW for Voltage ....................................................... 35

4.5 Calculating Electric Heat Capacity in BTUH ................................................ 35

4.6 Checking Indoor Air-Flow ............................................................................. 35

4.6.1 Estimating CFM Using External Static Pressure ................................... 35

4.6.2 Estimating CFM Using Electric HEat Temperature Rise ....................... 35

4.7 Checking Refrigerant Charge ....................................................................... 36

5.0 COMPONENTS & CONTROLS ...................................................................... 36

5.1 Blower Motor ................................................................................................ 36

5.2 Motor Run Capacitor .................................................................................... 36

5.3 Blower Control .............................................................................................. 37

5.4 Blower .......................................................................................................... 37

5.5 Transformer .................................................................................................. 37

5.6 Indoor Coil Assembly ................................................................................... 37

6.0 ACCESSORIES & KITS .................................................................................. 38

6.1 Electric Resistance Heart Kits ...................................................................... 38

6.2 Jumper Bar Kits ............................................................................................ 38

6.3 Auxiliary Horizontal Overow Pans .............................................................. 38

6.4 External Filter Bases .................................................................................... 38

6.5 Combustible Floor Bases ............................................................................. 39

6.6 Horizontal Adapter Kits ................................................................................ 39

7.0 MAINTENANCE .............................................................................................. 39

7.1 Air Filter ........................................................................................................ 39

7.2 Indoor Coil, Drain Pan, Drain Line ............................................................... 40

7.3 Blower Motor and Wheel .............................................................................. 40

7.4 Motor Lubrication ......................................................................................... 40

7.5 Blower Assembly Removal & Replacement ................................................. 40

7.6 Motor Replacement ...................................................................................... 41

7.7 Blower Wheel Replacement ......................................................................... 41

7.8 Replacement Parts ....................................................................................... 41

8.0 DIAGNOSTICS ................................................................................................ 42

9.0 WIRING DIAGRAMS ....................................................................................... 43

9.1 DRAH1T - 208-240V ..................................................................... 43

WARNING (SEE SECTION 3.2.2: VERTICAL DOWNFLOW)

The RXHB-17, RXHB-21 or RXHB-24 combustible oor base is required when

some units with electric heat are applied downow on combustible ooring.

Failure to use the base can cause a re resulting in property damage, personal

injury or death. See CLEARANCES for units requiring a combustible oor base.

See the accessory section in this manual for combustible oor base RXHB.

WARNING

These instructions are intended as an aid to qualied, licensed service per-

sonnel 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, adjust-

ment, service or maintenance possibly resulting in re, electrical shock, prop-

erty damage, personal injury or death.

WARNING

Duct leaks can create an unbalanced system and draw pollutants such as

dirt, dust, fumes and odors into the home causing property damage. Fumes

and odors from toxic, volatile or ammable chemicals, as well as automo-

bile exhaust and carbon monoxide (CO), can be drawn into the living space

through leaking ducts and unbalanced duct systems causing personal injury

or death (see Figure 1).

• If air-moving equipment or ductwork is located in garages or off-garage stor-

age areas - all joints, seams, and openings in the equipment and duct must

be sealed to limit the migration of toxic fumes and odors including carbon

monoxide from migrating into the living space.

• If air-moving equipment or ductwork is located in spaces containing fuel

burning appliances such as water heaters or boilers - all joints, seams, and

openings in the equipment and duct must also be sealed to prevent depres-

surization of the space and possible migration of combustion byproducts

including carbon monoxide into the living space.

WARNING (SEE SECTION 3.6: DUCTWORK)

Do not, under any circumstances, connect return ductwork to any other heat

producing device such as replace insert, stove, etc. Unauthorized use of

such devices may result in re, carbon monoxide poisoning, explosion, per-

sonal injury or property damage.

WARNING (SEE SECTION 7.0: MAINTENANCE)

Units with circuit breaker(s) meet requirements as a service disconnect

switch, however, if access is required to the line side (covered) of the circuit

breaker, this side of the breaker(s) will be energized with the breaker(s) de-en-

ergized. Contact with the line side can cause electrical shock resulting in per-

sonal injury or death.

WARNING (SEE SECTION 3.13.2: GROUNDING)

The unit must be permanently grounded. Failure to do so can result in electri-

cal shock causing personal injury or death.

WARNING

Because of possible damage to

equipment or personal injury,

installation, service, and mainte-

nance should be performed by a

trained, qualied service person-

nel. Consumer service is recom-

mended only for lter cleaning/re-

placement. Never operate the unit

with the access panels removed.

WARNING

If removal of the blower assembly

is required, all disconnect switch-

es supplying power to the equip-

ment must be de-energized and

locked (if not in sight of unit) so

the eld power wires can be safely

removed from the blower assembly.

Failure to do so can cause electrical

shock resulting in personal injury

or death.

WARNING

Disconnect all power to unit

before installing or servicing.

More than one disconnect switch

may be required to de-energize

the equipment. Hazardous volt-

age can cause severe personal

injury or death.

(SEE SECTION 3.13:

ELECTRICAL WIRING)

(SEE SECTION 7.5: BLOWER

ASSEMBLY REMOVAL &

REPLACEMENT)

Continued on next page ❯

1.0 SAFETY INFORMATION

CAUTION

(SEE SECTION 3.2.2: VERTICAL DOWNFLOW & HORIZONTAL RIGHT DISCHARGE)

Unit must be recongured for vertical down or horizontal right supply air dis-

charge applications. The coil must be repositioned so the vertical drainpan is

on the bottom for vertical down discharge applications or the horizontal drip

pan is below coil for horizontal right discharge applications. Failure to recon-

gure the unit for these applications can result in property damage and poor

system performance.

CAUTION (SEE SECTION 3.3: AUXILIARY OVERFLOW PAN)

In compliance with recognized codes, an auxiliary drain pan must be

installed under all equipment containing evaporator coils that are located in

any area of a structure where damage to the building or building contents

may occur as a result of an overow of the coil drain pan or a stoppage in

the primary condensate drain piping. See Section 6.3 of this manual for

auxiliary horizontal overow pan accessory information (model RXBM).

NOTICE

When used in cooling applications, excessive sweating may occur when unit

is installed in an unconditioned space. This can result in property damage.

WARNING (SEE SECTION 3.7: AIR FILTER)

Do not operate the system without lters. A portion of the dust entrained in

the air may temporarily lodge in the duct runs and at the supply registers. Any

circulated dust particles could be heated and charred by contact with the heat-

ing elements. This residue could soil ceilings, walls, drapes, carpets and other

articles in the house.

Soot damage may occur even with lters in place when certain types of can-

dles, oil lamps or standing pilots are burned.

WARNING

The rst 36 inches of supply air plenum and ductwork must be constructed

of sheet metal as required by NFPA 90B. The supply air plenum or duct must

have a solid sheet metal bottom directly under the unit with no openings, reg-

isters or exible air ducts located in it. If exible supply air ducts are used they

may be located only in the vertical walls of a rectangular plenum, a minimum

of 6 inches from the solid bottom. Metal plenum or duct may be connected

to the combustible oor base, if not, it must be connected to the unit supply

duct anges such that combustible oor or other combustible material is not

exposed to the supply air opening from the downow unit. Exposing combus-

tible (non-metal) material to the supply opening of a downow unit can cause

a re resulting in property damage, personal injury or death.

Exceptions to downow warnings:

• Installations on concrete oor slab with supply air plenum and ductwork

completely encased in not less than 2 inches of concrete (See NFPA 90B).

NOTICE

Improper installation, or installation not made in accordance with the Underwriters

Laboratory (UL) certication or these instructions, can result in unsatisfactory

operation and/or dangerous conditions and are not covered by the unit warranty.

WARNING

PROPOSITION 65: This appliance

contains berglass insulation.

Respirable particles of berglass

are known to the State of California

to cause cancer.

All manufacturer products meet

current Federal OSHA Guidelines for

safety. California Proposition 65

warnings are required for certain

products, which are not covered by

the OSHA standards.

California’s Proposition 65 requires

warnings for products sold in

California that contain or produce

any of over 600 listed chemicals

known to the State of California to

cause cancer or birth defects such

as berglass insulation, lead in

brass, and combustion products

from natural gas.

All “new equipment” shipped for

sale in California will have labels

stating that the product contains

and/or produces Proposition 65

chemicals. Although we have not

changed our processes, having the

same label on all our products facil-

itates manufacturing and shipping.

We cannot always know “when,

or if” products will be sold in the

California market.

You may receive inquiries from cus-

tomers about chemicals found in, or

produced by, some of our heating

and air-conditioning equipment, or

found in natural gas used with some

of our products. Listed below are

those chemicals and substances

commonly associated with similar

equipment in our industry and other

manufacturers.

• Glass Wool (Fiberglass) Insulation

• Carbon Monoxide (CO).

• Formaldehyde

• Benzene

More details are available at the

websites for OSHA (Occupational

Safety and Health Administration),

at www.osha.gov and the State of

California’s OEHHA (Ofce of

Environmental Health Hazard

Assessment), at www.oehha.org.

Consumer education is important

since the chemicals and substanc-

es on the list are found in our daily

lives. Most consumers are aware

that products present safety and

health risks, when improperly used,

handled and maintained.

NOTICE

Improper installation, or installation not made in accordance with the Underwriters

Laboratory (UL) certication or these instructions, can result in unsatisfactory

operation and/or dangerous conditions and are not covered by the unit warranty.

WARNING

Duct leaks can create an unbalanced system and draw pollutants such as

dirt, dust, fumes and odors into the home causing property damage. Fumes

and odors from toxic, volatile or ammable chemicals, as well as automo-

bile exhaust and carbon monoxide (CO), can be drawn into the living space

through leaking ducts and unbalanced duct systems causing personal injury

or death (see Figure 1).

• If air-moving equipment or ductwork is located in garages or off-garage stor-

age areas - all joints, seams, and openings in the equipment and duct must

be sealed to limit the migration of toxic fumes and odors including carbon

monoxide from migrating into the living space.

• If air-moving equipment or ductwork is located in spaces containing fuel

burning appliances such as water heaters or boilers - all joints, seams, and

openings in the equipment and duct must also be sealed to prevent depres-

surization of the space and possible migration of combustion byproducts

including carbon monoxide into the living space.

NOTICE

Use of this air-handler during construction is not recommended. If oper-

ation during construction is absolutely required, the following temporary

installation requirements must be followed:

Installation must comply with all Installation Instructions in this manual

including the following items:

• Properly sized power supply and circuit breaker/fuse

• Air-handler operating under thermostatic control;

• Return air duct sealed to the air-handler;

• Air lters must be in place;

• Correct air-ow setting for application

• Removing the coil and storing it in a clean safe place is highly recom-

mended until construction is completed and the outdoor unit is installed.

• Clean air-handler, duct work, and components including coil upon com-

pletion of the construction process and verify proper air-handler operat-

ing conditions according as stated in this instruction manual.

• NOTE: Electric strip heater elements tend to emit a burning odor for a few

days if dust has accumulated during construction. Heater elements are

easily damaged. Take great care when cleaning them. Low pressure com-

pressed air is recommended for cleaning elements.

2.0 GENERAL INFORMATION

2.1 IMPORTANT INFORMATION ABOUT EFFICIENCY & INDOOR

AIR QUALITY

Central cooling and heating equipment is only as efcient as the duct system that car-

ries the cooled or heated air. To maintain efciency, comfort and good indoor air quality,

FIGURE 1

MIGRATION OF DANGEROUS SUBSTANCES, FUMES, AND ODORS INTO LIVING SPACES

WARNING

Carbon Monoxide (CO) Poisoning

Can Cause Severe Injury or Death.

Carbon Monoxide from the exhaust of motor vehicles

and other fuel burning devices can be drawn into the

living space by the operation of the central heating

and air conditioning system.

Exhaust from motor vehicles, generators, garden tractors,

mowers, portable heaters, charcoal and gas grills, gasoline

powered tools, and outdoor camping equipment contains

carbon monoxide, a poisonous gas that can kill you.

You cannot see it, smell it, or taste it.

•

Do NOT operate an automobile or any engine in a

garage for more than the few seconds it takes to

enter or exit the garage.

•

Do NOT operate any fuel-burning device in an

enclosed or partly enclosed space, or near

building windows, doors or air intakes.

The U.S. Consumer Product Safety Commission (CPSC)

and Health Canada recommend the installation of UL or CSA

certied Carbon Monoxide Alarm(s) in every home.

it is important to have the proper balance between the air being supplied to each room

and the air returning to the cooling and heating equipment.

Proper balance and sealing of the duct system improves the efciency of the heating

and air conditioning system and improves the indoor air quality of the home by reducing

the amount of airborne pollutants that enter homes from spaces where the ductwork

and/or equipment is located. The manufacturer and the U.S. Environmental Protection

Agency’s Energy Star Program recommend that central duct systems be checked by a

qualied contractor for proper balance and sealing.

2.2 CHECKING PRODUCT RECEIVED

Immediately upon receipt, all cartons and contents should be inspected for transit dam-

age. Units with damaged cartons should be opened immediately. If damage is found, it

should be noted on the delivery documents and a damage claim led with the delivering

carrier.

After unit has been delivered to the job site, remove the unit from the carton taking care

not to damage the unit. Check the unit rating plate for unit model number, unit size, coil

model, voltage, phase, etc. to assure the unit matches the job specications.

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FIGURE 2

MODEL NUMBER NOMENCLATURE

2.3 MODEL NUMBER NOMENCLATURE

AVAILABLE 208/240V MODELS

2.4 AVAILABLE MODELS

Notes:

• J Voltage (208/240V) single phase air handler is designed to be used with single or

three phase 208/240V power. When connecting 3-phase power to the air handler ter-

minal block, bring only two leads to the terminal block. Cap, insulate and fully secure

the third lead.

• The air handlers are shipped from the factory with the proper indoor coil installed, and

cannot be ordered without a coil.

• These air handlers do not have an internal lter rack. An external lter rack or other

means of ltration of return air is required.

• Electric resistance heaters are eld installed items. (See Section 6.1)

DRAH1TA2417ASTNJA

DRAH1TA3617ASTNJA

DRAH1TA3621AHTNJA

DRAH1TA3621AMTNJA

DRAH1TA4821AMTNJA

DRAH1TA4821ASTNJA

DRAH1TA6021ASTNJA

DRAH1TA6024ASTNJA

2.5.1 DIMENSIONS & WEIGHTS: DRAH1T MODELS

UPFLOW UNIT SHOWN;

UNIT MAY BE INSTALLED UPFLOW, DOWNFLOW. HORIZONTAL RIGHT, OR LEFT AIR SUPPLY.

Return Air Return Air Opening

Model Opening Width Depth/Length

Cabinet Size (Inches) (Inches)

17 157⁄8193⁄4

21 193⁄8193⁄4

24 227⁄8193⁄4

Return Air Opening Dimensions

FIGURE 3A

DIMENSIONS AND WEIGHTS

A-1038-01

NOTE: 24” CLEARANCE REQUIRED

IN FRONT OF UNIT FOR FILTER

AND COIL MAINTENANCE.

ELECTRICAL CONNECTIONS MAY

EXIT TOP OR EITHER SIDE

HIGH VOLTAGE CONNECTION 7/8”,

1 3/32”, 1 31/32” DIA. KNOCK OUTS.

LOW VOLTAGE CONNECTION

5/8” AND 7/8” KNOCK OUT

(OUTSIDE OF CABINET)

FLANGES ARE PROVIDED

FOR FIELD INSTALLATION

AUXILIARY DRAIN CONNECTION

3/4” FEMALE PIPE THREAD (NPT)

HORIZONTAL APPLICATION ONLY

PRIMARY DRAIN CONNECTION

3/4” FEMALE PIPE THREAD (NPT)

AUXILIARY DRAIN CONNECTION

3/4” FEMALE PIPE THREAD (NPT)

UPFLOW/DOWNFLOW APPLICATION

ONLY

LIQUID LINE CONNECTION

COPPER (SWEAT)

VAPOR LINE CONNECTION

COPPER (SWEAT)

2111/16

105/16

SUPPLY AIR

191/2

RETURN AIR

OPENING

(SEE DUCT FLANGES, SECTION 3.5,

FOR INSTRUCTIONS)

DIMENSIONAL DATA

MODEL

SIZE

REFRIGERANT CONNECTIONS

UNIT

HEIGHT

IN. [mm]

UNIT

WIDTH

“W” IN.

[mm]

SUPPLY

DUCT

“A” IN.

[mm]

NOMINAL CFM

[L/s]

UNIT WEIGHT / SHIPPING

WEIGHT (LBS.) [kg]

SWEAT (IN.) [mm] ID LO HI UNIT WITH

COIL (MAX. kW.)

DRAH1T LIQUID VAPOR

2717AS 3/8” [9.53] 3/4” [19.05] 421/2” [1080] 171/2” [445] 16” [409] 600 [283] 800 [378] 92/106 [42/48]

3617AS 3/8” [9.53] 3/4” [19.05] 421/2” [1080] 171/2” [445] 16” [409] 1000 [472] 1200 [566] 96/110 [44/50]

3621AM 3/8” [9.53] 7/8” [22.23] 501/2” [1282] 21” [533] 191/2” [495] 1000 [472] 1200 [566] 126/142 [57/64]

3621AH 3/8” [9.53] 7/8” [22.23] 57 [1448] 21” [533] 191/2” [495] 1000 [472] 1200 [566] 137/149 [62/68]

4821AS 3/8” [9.53] 7/8” [22.23] 501/2” [1282] 21” [533] 191/2” [495] 1400 [661] 1600 [755] 128/144 [56/65]

4821AM 3/8” [9.53] 7/8” [22.23] 57 [1448] 21” [533] 191/2” [495] 1400 [661] 1600 [755] 139/151 [63/68]

6021AS 3/8” [9.53] 7/8” [22.23] 57 [1448] 21” [533] 191/2” [495] 1600 [755] 1725 [814] 139/151 [63/68]

6024AS 3/8” [9.53] 7/8” [22.23] 551/2” [1410] 241/2” [622] 23” [585] — 1800 [850] 159/176 [72/80]

2.6 IMPORTANCE OF PROPER INDOOR/OUTDOOR MATCH-UPS

To assure many years of reliable operation and optimum customer comfort and to

assure the outdoor unit warranty remains valid, an air-handler model should be selected

that is properly matched to the outdoor unit. This is especially critical for heat pump

systems to assure proper refrigerant charge balance between the cooling and heating

modes. The recommended approach is to select an air-handler model that has an

AHRI match with the outdoor unit. Refer to the AHRI directory at www.ahridirectory.

org to conrm the air-handler and outdoor unit are a certied combination in the AHRI

Directory.

2.7 IMPORTANCE OF QUALITY INSTALLATION

A quality installation is critical to assure safety, reliability, comfort, and customer satis-

faction. Strict adherence to applicable codes, the information in this installation manual,

the outdoor unit installation manual, and the thermostat installation manual are key to a

quality installation. Read the entire instruction manuals before starting the installation.

IMPORTANT: This product has been designed and manufactured to meet certied

AHRI capacity and efciency ratings with the appropriate outdoor units. However, prop-

er refrigerant charge, proper airow, and refrigerant line sizing are critical to achieve

optimum capacity and efciency and to assure reliable operation. Installation of this

product should follow the manufacturer’s refrigerant charging and airow instructions

located in the outdoor unit installation instructions and the charging chart label afxed to

the outdoor unit. Failure to conrm proper charge and airow may reduce energy ef-

ciency and shorten equipment life.

The equipment has been evaluated in accordance with the Code of Federal

Regulations, Chapter XX, Part 3280.

Install the unit in accordance with applicable national, state, and local codes. Latest edi-

tions are available from: “National Fire Protection Association, Inc., Batterymarch Park,

Quincy, MA 02269.” These publications are:

• ANSI/NFPA No. 70-(Latest Edition) National Electrical Code.

• NFPA90A Installation of Air Conditioning and Ventilating Systems.

• NFPA90B Installation of warm air heating and air conditioning systems.

Install the unit in such a way as to allow necessary access to the coil/lter rack and

blower/control compartment.

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