Unitary products group LA120 Installation guide

Brand: Unitary products group

Model: LA120

Category: Split-system air conditioners

Type: Installation guide

Unitary products group LA120 is a versatile air handling unit designed for cooling applications. It features a well-insulated cabinet, a DX cooling coil with copper tubes and aluminum fins, a centrifugal blower, and a blower motor contactor. The LA120 is available in a range of capacities to suit different room sizes and cooling requirements. It can be installed vertically or horizontally, making it suitable for a variety of applications. The LA120 is also compatible with a range of accessories, including a supply air plenum, a return air grille, and a base.

INSTALLATION

MANUAL

CAUTION: READ ALL SAFETY GUIDES BEFORE YOU

BEGIN TO INSTALL YOUR UNIT.

SAVE THIS MANUAL

MODEL: LA120

(AIR COOLED)

SPLIT-SYSTEM

AIR CONDITIONER

035-18525-001-B-0203

CONTENTS

NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . 4

AGENCY APPROVALS . . . . . . . . . . . . . . . . . . . . . . . . . 4

INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

NOTES, CAUTIONS AND WARNINGS

Installer should pay particular attention to the words:

NOTE, CAUTION, and WARNING. Notes are intended to

clarify or make the installation easier. Cautions are given

to prevent equipment damage. Warnings are given to

alert installer that personal injury and/or equipment dam-

age may result if installation procedure is not handled

properly.

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TABLE OF CONTENTS

NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . .3

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . .4

RENEWAL PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

AGENCY APPROVALS . . . . . . . . . . . . . . . . . . . . . . .4

INSPECTION 4

INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

LIMITATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

RIGGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

CLEARANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

VERTICAL / HORIZONTAL INSTALLATION . . . . . . . . . . 8

DUCT CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

DRAIN CONNECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

REFRIGERANT MAINS . . . . . . . . . . . . . . . . . . . . . . . . . . 9

POWER AND CONTROL WIRING . . . . . . . . . . . . . . . . . 10

SUPPLY AIR BLOWER ADJUSTMENT . . . . . . . . . . . . . 11

ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

EVAPORATOR COIL . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

DRAIN PAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

BELTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

LIST OF FIGURES

Fig. # Pg. #

1. UNIT SUSPENSION MOUNTING LA120 (HORIZONTAL

APPLICATIONS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2. VERTICAL AND HORIZONTAL APPLICATION . . . . . . 8

3. VERTICAL AND HORIZONTAL APPLICATION . . . . . . 8

4. SUPPLY AIR PLENUM ACCESSORY . . . . . . . . . . . . . 9

5. BASE ACCESSORY (VERTICAL ONLY) . . . . . . . . . . . 9

6. RECOMMENDED DRAIN PIPING . . . . . . . . . . . . . . . 10

7. RETURN AIR GRILLE ACCESSORY (VERTICAL) . . 10

Fig. # Pg. #

8. FIELD WIRING DIAGRAMS FOR POWER SUPPLY . 12

9. FIELD WIRING DIAGRAM COOLING

(COOLING ONLY) . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

10. TYPICAL MOTOR MOUNTING ASSEMBLY . . . . . . . 13

11. HOLE LOCATIONS FOR PRESSURE DROP

READINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

12. PRESSURE DROP ACROSS A DRY

EVAPORATOR COIL VS. SUPPLY AIR CFM . . . . . . 14

13. BLOWER PERFORMANCE CURVE . . . . . . . . . . . . . 15

14. UNIT DIMENSIONS AND CLEARANCES . . . . . . . . . 16

LIST OF TABLES

Tbl. # Pg. #

1. PHYSICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2. APPLICATION LIMITATIONS . . . . . . . . . . . . . . . . . . . 5

3. LA120 UNIT SUSPENSION WEIGHTS (LBS) . . . . . . . 7

4. ELECTRIC HEATER DIMENSIONS FA120 . . . . . . . . . 9

5. ELECTRICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . 11

6. SUPPLY AIR BLOWER MOTOR PULLY

ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

7. BLOWER MOTOR AND DRIVE DATA . . . . . . . . . . . 14

8. SUPPLY AIR BLOWER PERFORMANCE 1, 2 . . . . . 15

9. ACCESSORY STATIC RESISTANCE (IWG)

(TO BE INCLUDED WITH DUCT SYSTEM

STATIC RESISTANCE) . . . . . . . . . . . . . . . . . . . . . . 16

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NOMENCLATURE

YORK SPLIT INDOOR PRODUCT NOMENCLATURE

L A 120 C 0 0 A 2 A A A 1 A

Model # Model Number Description Options

L Product Category L = Air Handling Unit-Cooling F = Air Handlng Unit-Heat Pump

A Product Identifier A = R-22 Standard Efficiency 2-Pipe

B = R-22 Standard Efficiency 4-Pipe

120

Nominal Cooling

Capacity

MBH

090 = 7-1/2 Ton

120 =10 Ton

150 = 12-1/2 Ton

180 = 15 Ton

240 = 20 Ton

C Heat Type C = Cooling Only

00 Nominal Heating

Capacity 00 = No Heat Installed

A Airflow Options A = None

2Voltage 6 = 208/230-460-3-60

A Factory Options A = None

B = Disconnect

AA Special Options AA = None

AC = Technicoat Coil

1 Generation 1 = 1st Generation 2 = 2ndGeneration

AStyle A = Style A B = Style B

*NOT AVAILABLE IN HEAT PUMP

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GENERAL

This completely assembled unit includes a well-insu-

lated cabinet, a DX cooling coil with copper tubes and

aluminum fins, 1 expansion valve, 1 distributor, throw-

away filters, a centrifugal blower, a blower motor con-

tactor and a small holding charge of Refrigerant-22. A

blower motor with adjustable drive is factory mounted

on every unit.

Supplemental resistance heaters, a supply air plenum,

a return air grille and a base are available as accesso-

ries for field installation.

The unit is shipped in the vertical position with a verti-

cal air discharge. The blower section can be reposi-

tioned as shown in Figure 2 for horizontal applications.

SAFETY CONSIDERATIONS

Installer should pay particular attention to the words:

NOTE, CAUTION, and WARNING. Notes are intended

to clarify or make the installation easier. Cautions are

given to prevent equipment damage. Warnings are

given to alert installer that personal injury and/or equip-

ment damage may result if installation procedure is not

handled properly.

RENEWAL PARTS

Refer to parts Manual for complete listing of replace-

ment parts on this equipment. The forms referenced in

this instruction may be ordered from:

Standard Register

2101 West Tecumseh Road

Norman, Oklahoma 73069

Toll Free TEL: 877-318-7920

Toll Free FAX: 877-379-7920

This instruction covers the installation and operation of

evaporator blower units. For information on the opera-

tion of the matching condensing unit, refer to Form

035-18506-001.

AGENCY APPROVALS

Design certified by UL as follows:

1. For use as a cooling coil/air handler only.

2. For indoor installation only.

INSPECTION

As soon as a unit is received, it should be inspected for

possible damage during transit. If damage is evident,

the extent of damage should be noted on the carrier's

freight bill. A separate request for inspection by the

carrier's agent should be made in writing.

Improper installation may create a condition

where the operation of the product could cause

personal injury or property damage.

Improper installation, adjustment, alteration,

service or maintenance can cause injury or

property damage. refer to this manual for

assistance or additional information, consult a

qualified installer, service agency.

This product must be installed in strict compli-

ance with the enclosed installation instructions

and any applicable local, state, and national

codes including but not limited to, building,

electrical and mechanical codes.

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TABLE 1: PHYSICAL DATA

DESCRIPTION UNIT MODEL

LA120

Evaporator

Coil

Rows Deep 3

Rows High 32

Finned Length (in.) 54.5

Fins / Inch 13

Tube O. D. (in.) 3/8

Face Area (Sq. Ft.) 12.1

Centrifugal1

Blower

1. Refer to data in Table 8 for complete motor specifications.

Wheel Dia. X Width (in.) 18 X 18

Filters2

2. Filters are throwaway type 2” filters may be used, if required by removing the 1” filter retaining angles provided in the filter rack.

Qty. & Size (in.) (6) 20 X 20 X 1

Face Area (Sq. Ft.) 16.7

Operating Charge (Refrigerant-22) Lbs. - Oz. 5-8

Weight (Lbs.) Shipping 439

Operating 399

Accessory

Weights (Lbs.)

Electric

Heaters

10 KW 66

16 KW 70

26 KW 74

36 KW 77

Supply Air Plenum 144

Base 65

Return Air Grille 19

Horizontal Suspension 68

Steam Coil 149

Hot Water Coil 135

TABLE 2: APPLICATION LIMITATIONS

Power

Supply

Voltage

Variation1

1. Utilization Range”A” in accordance with ARI Standard 110.

Supply Air Range

CFM

Entering Air Temperatures, ºF

Cooling-db/wb Heating-db

Min. Max. Min. Max. Min. Max. Min. Max.

208/230-3-60 187 252 2800 6800 65/67 96/72 - 77

460-3-60 432 504

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INSTALLATION

LIMITATIONS

This unit must be installed in accordance with all

national and local safety codes. If no local codes

apply, installation must conform to the appropriate

national code. The unit is designed to meet National

Safety code Standards. If components are to be added

to a unit to meet local codes, they are to be installed at

the dealer's and/or the customer's expense. See

Table 2 for application limitations.

LOCATION

The LA 120 is not designed for outdoor installation. It

must be located within the building structure, either

inside or outside the conditioned space.

The unit should be located as close to the condensing

unit as practical and positioned to minimize bends in

the refrigerant piping.

Units being installed vertically or horizontally can be set

directly on a floor or platform, or metal or wooden

beams can support them.

Units being installed horizontally can be suspended

from above as shown in Figure 1. Refer to Form 035-

16622-001 for more information on the installation of

the suspension accessory and for the individual load

on each hanger rod.

A field added secondary drain pan may be required in

locations where possible condensate overflow could

cause damage.

RIGGING AND HANDLING

Be careful when moving the unit. Do not remove any

packaging until the unit is near its final location.

The packaging consists of a bottom wooden skid that

can be lifted with a fork truck from any direction, a card-

board container that covers the entire unit, and strap-

ping that secures the cardboard container to the

bottom skid.

These units can be rigged with slings under the bottom

skid.

Before rigging any unit, determine its weight from

Table 1 . Before rigging a unit for horizontal installa-

tion, make sure that its weight will be distributed

equally.

Be careful when attaching the hanger rods.

Use a washer with a back-up nut on each rod

and tighten down against the cabinet so they

will not be allowed to turn or slip.

Spreader bars should be used to prevent

slings from crushing the unit panels and frame.

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CLEARANCES

The clearances listed on the unit dimension drawing

(Figure 10) are required for the proper service and

operation of the unit.

VERTICAL / HORIZONTAL INSTALLATION

The LA120 unit is shipped for vertical installation with a

vertical air discharge as shown in Figure 2, but may be

converted to other arrangements per the following

instructions:

1. Remove the panels from the blower section.

2. Remove the four Phillips machine bolts that hold

the coil and blower sections together. A bolt is

located near each corner.

3. Move the blower section to the proper location.

4. Attach the blower section to the coil section with

the machine bolts removed in Step 2.

5. Before replacing the panel, see Duct Connection

and Drain Connection.

Replace the panels.

FIGURE 1: UNIT SUSPENSION MOUNTING LA120 (HORIZONTAL APPLICATIONS)

TABLE 3: LA120 UNIT SUSPENSION WEIGHTS (LBS)

SUSP'N. POINT W/ 2 HP MOTOR W/ HEATER ACCESS W/ PLENUM ACCESS W/ HEATER & PLENUM

ACCESS

A95 95 85 85

B120 120 100 100

C95 115 165 185

D115 140 185 205

TOTAL WT.425 470 535 575

FIGURE 2: VERTICAL AND HORIZONTAL APPLICATION

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DUCT CONNECTIONS

All ducts should be designed and installed in accor-

dance with all national and/or local codes.

NOTE: Certain blower positions are not recommended

because the blower motor should not be mounted

upside down.

Ducts should be sized no smaller than the duct flanges

on the unit or the electric heater (if used). Refer to the

unit dimensions (Figure 10) and the heater detail (Fig-

ure 3) for these sizes. Refer to Form 035-16602-001

for installation instructions on the electric heater.

A supply air plenum (Figure 3), a base (Figure 4) and

a return air grille (Figure 5) are available as field-

installed accessories and one of the following respec-

tive instructions will be packed with each.

Form 035-16650-001 Supply Air Plenum

Form 035-16621-001 Return Air Grille

Form 035-16632-001 Base

The supply air plenum and the return air grille should

be used in lieu of ductwork only when a free blow/free

return application is practical.

FIGURE 1 : ELECTRIC HEAT ACCESSORY

HEATER

ELEMENT

CHAMBER

3/4

1DLE

ACCESS OPENING FOR POWER SUPPLY WIRING

1/2

IRING HARNESS LOCATION

his opening in the bottom of the heater

control box is used for the wiring harness

hat connects the heater accessory to the

basic unit. It is provided with a squeeze

connector for securing the wiring harness,

and its location corresponds to the loca-

ion of the 1-23/32 inch knockout in the top

panel of the basic unit.

CONTROL BOX

ACCESS PANEL

10KW THRU 30KW - Add a 1-1/4 inch conduit fitting

to the 1-23/32 inch hole for wire sizes up through

#1 AWG. Remove the knockout ring and add a

1-1/2 inch conduit fitting to the 1-31/32 inch hole

for wire sizes up through #0 AWG.

TABLE 4: ELECTRIC HEATER DIMENSIONS FA120

HEATER

MODEL

NOM.

Heater Dimensions (inches)

ABCDEFGHKLM

2HS04501025, 46 10

28-1/2 25-1/4 14-1/4 1 4 1/2 5-1/2 1-1/2 1-1/2 22-1/4 19-1/4

2HS04501625, 46 16

2HS04502625, 46 26

2HS04503625, 48 36

FIGURE 3: SUPPLY AIR PLENUM ACCESSORY

A L T E R N A T E

A I R D I S C H A R G E

T O P P A N E L S

B L O W E R

U N I T

S U P P L Y

A I R

G R I L L E

FIGURE 4: BASE ACCESSORY (VERTICAL ONLY)

B L O W E R

U N I T

B L O W E R U N I T

B A S E P A N E L W h e n o u t d o o r a i r i s r e q u i r e d , a h o l e c a n b e

c u t i n b a c k p a n e l f o r c o n n e c t i n g d u c t w o r k .

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DRAIN CONNECTION

The drain line MUST be trapped because the coil is

located on the negative side of the supply air blower. It

must also be protected from freezing temperatures.

A 7/8" OD stub connection is provided within the cabi-

net on both ends of the condensate drain pan for either

left hand or right hand piping connections. Refer to

Figure 6 for recommended drain piping.

The drain line is usually located on the same end of the

coil section as the refrigerant connections. The line

should be insulated where moisture drippage will be

objectionable or cause damage to the area. Seal the

unused drain connection with suitable mastic.

The 5" dimension must equal or exceed the negative

static pressure developed by the supply air blower. If it

does not, the condensate will not drain properly and

may overflow the drain pan. The trap must be at least

2" deep to maintain a water seal under all operating

conditions, especially during blower start up.

REFRIGERANT MAINS

Many service problems can be avoided by taking ade-

quate precautions to provide an internally clean and

dry system and by using procedures and materials that

conform with established standards.

Hard drawn copper tubing should be used where no

appreciable amount to bending around pipes or other

obstructions is necessary. Use long radius ells wher-

ever possible. If soft copper is used, care should be

taken to avoid sharp bends, which may cause a restric-

tion.

Fiber glass insulation and a sealing material such as

permagum should be packed around refrigerant lines

where they penetrate a wall to reduce vibration and to

retain some flexibility.

Support all refrigerant lines at minimum intervals with

suitable hangers, brackets or clamps.

Braze all copper to copper joints with Sil-Fos 5 or

equivalent brazing material. DO NOT use soft solder.

Never braze or solder the liquid and suction lines

together.

The complete suction line should be insulated with no

less than 1/2" ARMAFLEX or equivalent.

If it is desirable to tape or wire the liquid and suction

lines together for support purposes, they must be com-

pletely insulated from each other.

INSTALLING REFRIGERANT MAINS

The units are evacuated and dehydrated at the factory

and shipped with a holding charge of Refrigerant-22.

The suction and liquid connections are sealed with

copper discs.

Before starting installation of the mains, be sure the

unit has not developed a leak in transit by drilling a

small hole in the sealing discs. If pressure still exists,

the circuit may be considered leak free. If pressure

does not exist, the coil should be leak tested and the

necessary repairs should be made.

NOTE: To minimize the possibility of system failure due

to dirt and moisture, a filter-drier must be

installed in each liquid line as close to the

evaporator as possible. Filter-dryers are not

supplied with the evaporator blowers. They

are supplied with the matching YORK con-

densing sections.

FIGURE 5: RETURN AIR GRILLE ACCESSORY

(VERTICAL)

FIGURE 6: RECOMMENDED DRAIN PIPING

5 "

2 "

P L A S T I C

E L L *

STEEL

S T U B

C O N N E C T I O N

H O S E C L A M P S

E V A P O R A T O R

C O I L

D R A I N P A N

* F A C T O R Y S U P P L I E D

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10 Unitary Products Group

The temperature required to make or break a brazed

joint is sufficiently high to cause oxidation of the copper

unless an inert atmosphere is provided.

The liquid, suction and drain connections inside the

unit must be piped to the outside. Refer to Unit Dimen-

sions for locations of the access openings in the unit

panel.

The factories for field placement into these access

openings supplies protective grommets.

The blower units are shipped with the coil section side

panels suitable for right hand piping connections when

viewed from the return air side of the unit.

In left hand piping is required, the two panels on the

right side of the coil section can be interchanged with

the single panel on the left side of the coil section.

When left-hand piping connections are installed, the

suction line must be insulated to prevent moisture from

condensing and being carried into the blower section.

EXPANSION VALVE BULB

The expansion valve bulb must be fastened in the 10 or

2 o’clock position to the suction line outside the cabinet

after the piping connections have been made. Use the

clamps supplied with the valve. Bulb must be

insulated with Armaflex or Mystic to assure proper

operation.

POWER AND CONTROL WIRING

Install electrical wiring in accordance with the latest

National Electrical Code (NFPA standard No. 70) and/

or local regulations. The unit should be grounded in

accordance with these codes.

Route the power wires into the unit through one of the

7/8" knockouts in the panel with the supply air opening,

and connect them to the terminals on blower motor

contactor 10M. Route the control wires into the unit

through the other 7/8" knockout, and connect them to

terminals on block TB1.CONTROL WIRE SIZING.

To determine the total circuit length, add the follow-

ing distances:

1 - Outdoor Unit to Indoor Unit _____________

2 - Indoor Unit to Thermostat _____________

3 - Thermostat to Indoor Unit _____________

4 - Indoor Unit to Outdoor Unit _____________

5 - Outdoor Unit to Elec. Heater _____________

Total Circuit Length _____________

If the unit includes an electric heat accessory, route the

power wires into heater control box in lieu of the unit.

Refer to the unit drawing in Figure 13 for locations of

these knockouts.

If the unit includes an electric heat accessory, route the

power wires into heater control box in lieu of the unit.

Refer to electric heat instruction Form 035-16602-001

for additional installation information.

NOTE: Three-phase motor rotation may be incorrect

when unit is first started up. Reverse phase

(leads L1 and L2) at contactor to obtain the

correct rotation.

Dry nitrogen should flow through the system at

all times when heat is being applied and until

the joint has cooled.

Wire Size

Maximum Total

Circuit Length

(Feet)

#19 Solid

#18 Solid

#18 Stranded

#16 Stranded

#14 Stranded

#12 Stranded

130

170

180

270

455

730

TABLE 5: ELECTRICAL DATA

Blower Motor HP Power Supply FLA LRA Maximum Fuse Size Amps Maximum Wire Length Ft.

208-3-60 7.5 49.0 15 103

230-3-60 6.8 55.0 15 126

460-3060 3.4 27.0 15 505

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SUPPLY AIR BLOWER ADJUSTMENT

The RPM of the supply air blower will depend on the

required CFM, the unit accessories and the static resis-

tances of both the supply and the return air duct sys-

tems. With this information, the RPM for the supply air

blower can be determined from the blower perfor-

mance in Table 8 .

Knowing the required blower RPM and the blower

motor HP, the setting (turns open) for the supply air

motor pulley can be determined form Table 5 .

Each motor pulley has:

1. A threaded barrel with two (2) flats (or notched

recesses) 180 degrees apart.

2. A movable flange with one setscrew.

After the movable flange has been rotated to the

proper number of “turns open”, the set screw

should be tightened against the flat on the barrel to

lock the movable flange in against the flat on the

barrel to lock the movable flange in place. If the

pulley includes a locking collar, the locking collar

must be loosed to adjust the setting of the movable

flange.

3. The tension on the belt should be adjusted for a

deflection of 3/16 of an inch per foot of belt span

with an applied force of 2 to 3 pounds. This adjust-

ment is made by moving the blower motor mount-

ing plate. Refer to Figure 7. Turning the

adjustment bolt (B) moves the motor mounting

plate up or down. Note - Never loosen the tow nuts

(C). Two hex nuts (A) have to be loosened to

move the mounting plate and retighten after the

mounting plate has been moved to the proper posi-

tion.

FIGURE 7: FIELD WIRING DIAGRAMS FOR POWER SUPPLY

COOLING ONLY UNITS AND UNITS WITH

STEAM OR HOT WATER COIL ACCESSORY

ERMINALS ON

SUPPLY AIR

BLOWER MOTOR

CONTACTOR 10M

GROUND

SCREW

POWER WIRING,

DESCONNECT SWITCH

AND FUSING TO BE

SUPPLIED BY FIELD

LINE VOLTAGE

POWER SUPPLY

*Not required on 060 (1-Phase

only) All other units are 3-Phase.

TERMINALS

ON FUSE HOLDER

IN ELECTRIC HEAR

CONTROL BOX

GROUND LUG

IN ELECTRIC HEAT

CONTROL BOX

POWER WIRING,

DESCONNECT

SWITCH

AND FUSING

(OR CIRCUIT

BREAKER)

TO BE SUPPLIED

BY FIELD

3-PHASE

LINE VOLTAGE

POWER SUPPLY

NOTE: USE COPPER

CONDUCTORS ONLY

WIRE IN ACCORDANCE WITH LOCAL

AND NATIONAL ELECTRICAL CODES

UNITS WITH ELECTRIC HEAT ACCESSORY

FIGURE 8: FIELD WIRING DIAGRAM COOLING

(COOLING ONLY)

TERMINAL

BLOCK TB1

ON BLOWER

UNIT

COOLING

COND.

UNIT

24-VOLT

CONTROL

WIRING

TYPICAL TERMINALS

ON THERMOSTAT

NOTE: See PN 036-13335-002

for applicable thermostats.

TABLE 6: SUPPLY AIR BLOWER MOTOR PULLY

ADJUSTMENT

TURNS

OPEN

BLOWER DRIVE RANGE (RPM)

549-716

5549

4582

3625

2655

1685

0716

035-18525-001-B-0203

12 Unitary Products Group

4. All pulleys are factory aligned.

5. All supply air motor pulleys are factory set at 2

“turns open”.

After the supply air blower motor is operating,

adjust the resistances in both the supply and the

return duct system to balance the air distribution

throughout the conditioned space. The job specifi-

cations may require that this balancing be done by

someone other than the equipment installer.

To check the supply air CFM after the initial balancing

has been completed:

1. Drill two (2) 5/16-inch holes in the side panel as

shown in Figure 8.

2. Insert at least 8" of 1/4 inch tubing into each of

these holes for sufficient penetration into the air-

flow on both sides of the evaporator coil.

3. Using an inclined manometer, determine the pres-

sure drop across a dry evaporator coil. Since the

moisture on an evaporator coil may vary greatly,

measuring the pressure drop across a wet coil

under field conditions would be inaccurate. To

assure a dry coil, the refrigerant system should be

de-activated while the test is being run.

4. Knowing the pressure drop across a dry coil, the

actual CFM through the unit can be determined

from the curve in Figure 9.

If the CFM is above or below the specified valve, the

supply air motor pulley may have to be readjusted.

After on hour of operation, check the belt and pulleys

for tightness and alignment.

After readings have been obtained, remove the tubes

and seal up the drilled holes in the side panel. 5/16"

dot plugs (P/N 029-12880) are available through nor-

mal York parts ordering procedures.

FIGURE 9: TYPICAL MOTOR MOUNTING

ASSEMBLY

FIGURE 10: HOLE LOCATIONS FOR PRESSURE

DROP READINGS

Failure to properly adjust the total system air

quantity can result in extensive blower dam-

age.

5 / 1 6 "

H O L E

5 / 1 6 "

H O L E

18"

7 "

22"

10"

E V A P O R A T O R

C O I L

F I L T E R S

C O I L S E C T I O N

035-18525-001-B-0203

Unitary Products Group 13

NOTE: Shut down the refrigerant system before taking

any test measurements to assure a dry evapo-

rator coil.

TABLE 7: BLOWER MOTOR AND DRIVE DATA

Unit

Model

Motor

Blower HP*

Blower

RPM

Adjustable Motor Pulley Fixed Blower Pulley Belt

Pitch Dia.

(Inches)

Bore

(Inches)

Pitch Dia.

(Inches)

Bore

(Inches) Designation Pitch Lg.

(Inches)

LA120 2 549-716 3.1-4.1 7/8 9.5 1 A55 56.3

Motor Specifications

• 1750 RPM

• 208/230/460-3-60

•Solid Base

• 56 Frame

• Inherently Protected

• Permanently lubricated ball

bearings

FIGURE 11: PRESSURE DROP ACROSS A DRY EVAPORATOR COIL VS. SUPPLY AIR CFM

035-18525-001-B-0203

14 Unitary Products Group

FIGURE 12: BLOWER PERFORMANCE CURVE

TABLE 8: SUPPLY AIR BLOWER PERFORMANCE 1, 2

NOTE: Refer to Form 550.13-AD1 for blower performance curves.

RPM range for the standard, factory-mounted drive components.

1Available static pressure in IWG to overcome the resistance of the duct system and any accessories added to the unit. Refer to the respective tables for the

resistance of these accessories and for additional motor and drive data.

2 Motors can be selected to operate into their service factor because they are located in the moving air stream, upstream of any heating device. Units with steam or

hot water coils are the only exception.

LA120

3000

3500

4000

4500

5000

5500

6000

6500

7000

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1

External Static

CFM

0 Turns

1 Tu r n

2 Turns

3 Turns

4 Turns

5 Turns

10 TON BLOWER PERFORMANCE

ESP CFM RPM Watts CFM RPM Watts CFM RPM Watts CFM RPM Watts CFM RPM Watts CFM RPM Watts

0.2 - - - 5775 680 2168 5402 650 1851 4990 616 1516 4571 582 1281 4250 548 1097

0.4 5521 713 2283 5409 684 1954 4810 653 1633 4326 618 1307 3785 582 1069 3484 550 903

0.6 4864 718 2006 4736 688 1695 4098 657 1353 3411 622 1052 2635 586 826 - - -

0.8 4221 722 1695 3780 693 1393 2860 661 1019 - - - - - - - - -

1 3223 728 1376 2625 697 1097 - - - - - - - - - - - -

0turns 1turn 2turns 3turns 4turns 5turns

Exceeds Amperage rating of motor.

035-18525-001-B-0203

Unitary Products Group 15

ACCESSORIES

• ELECTRIC HEATER

Add 15” to unit height when using 10, 16, 26, or 36

KW heater

• SUPPLY AIR PLENUM

Add 27” to unit height when used.

• BASE

TABLE 9: ACCESSORY STATIC RESISTANCE (IWG)(TO BE INCLUDED WITH DUCT SYSTEM STATIC

RESISTANCE)

120

3200 3600 4000 4400 4800

Electric Heaters

10 KW 0.02 0.02 0.03 0.03 0.04

16 KW 0.03 0.04 0.05 0.06 0.07

26 KW 0.06 0.07 0.09 0.11 0.13

36 KW 0.09 0.11 0.14 0.17 0.20

Supply Air Plenum 0.05 0.06 0.07 0.08 0.10

Return Air Grille 0.05 0.06 0.07 0.08 0.10

Hot Water Coil 0.19 0.24 0.30 0.35 0.40

FIGURE 13: UNIT DIMENSIONS AND CLEARANCES

2 7 - 5 / 8

2 - 3 / 8

2 - 3 / 1 6

5 6 - 3 / 8

2 - 3 / 1 6

3 1 - 5 / 8

3 - 1 / 8

6 2 - 5 / 8

1 - 1 / 4 " K N O C K O U T

F O R 7 / 8 " O D D R A I N

C O N N E C T I O N *

( M u s t b e t r a p p e d )

F I L T E R A C C E S S P A N E L

F i l t e r s c a n b e r e m o v e d

t h r o u g h e i t h e r s i d e o f

t h e u n i t .

1 - 1 / 4 " K N O C K O U T F O R

5 / 8 " O D L I Q U I D C O N N E C T I O N *

C O I L

S E C T .

6 - 1 / 4 3 - 1 / 8

3 - 1 / 8 1 9

1 0

2 - 1 / 8

2 - 5 / 8 "

K N O C K -

O U T F O R

1 - 5 / 8 " O D

S U C T I O N

C O N N . *

3 2 - 3 / 8

1 8 - 7 / 8

5 - 1 / 2

5 - 7 / 8

B L O W E R

S E C T I O N

7 - 1 / 4 1 6 - 1 / 2

7 / 8

1 9 - 3 / 8 2 1 - 7 / 8

6 0 - 3 / 4

B L O W E R M O T O R A N D D R I V E A C C E S S P A N E L

( A l w a y s o n t h e w i r i n g c o n n e c t i o n s i d e o f u n i t )

L o c a t e d o n o p p o s i t e s i d e O N L Y w h e n t h e b l o w e r

s e c t i o n h a s b e e n r o t a t e d 1 8 0 f r o m p o s i t i o n s h o w n .

1 - 2 3 / 3 2 " K N O C K O U T

R e m o v e o n l y w h e n E l e c t r i c

H e a t A c c e s s o r y i s u s e d .

7 / 8 " K N O C K O U T F O R P O W E R W I R I N G

D o n o t r e m o v e t h i s k n o c k o u t w h e n t h e u n i t i s e q u i p p e d w i t h a n E l e c t r i

H e a t A c c e s s o r y . R e f e r t o d e t a i l o f t h e H e a t e r A c c e s s o r y f o r p o w e r

w i r i n g a c c e s s o p e n i n g

7 / 8 " K N O C K O U T F O R

C O N T R O L W I R I N G

A L T E R N A T E

2 - 5 / 8 " K N O C K O U T *

* R e f e r t o I N S T A L L I N G R E F R I G E R A N T M A I N S i n i n s t a l l a t i o n i n s t r u c t i o n

w h e n p i p i n g t h r o u g h t h e o p p o s i t e s i d e o f t h e u n i t .

A I R

O U T

A I R

I N

Subject to change without notice. Printed in U.S.A. 035-18525-001-B-0203

Unitary 5005 Norman

Products York OK

Group Drive 73069

MAINTENANCE

EVAPORATOR COIL

Do not allow dirt to accumulate on the evaporator coil

or other parts of the evaporator air circuit. Clean as

often as necessary to assure good system perfor-

mance. Use a brush, vacuum cleaner attachment or

other suitable means.

FILTERS

The filters must be replaced as often as necessary to

assure good air flow and filtering action.

Refer to Figure 10 for filter access panel location.

DRAIN PAN

The drain pan should be inspected regularly to assure

proper drainage.

LUBRICATION

The bearings for the blower shaft and the blower

motors are permanently lubricated and should not

require additional lubricant.

BELTS

Maintain belt tension to extend belt life. Replace when

signs of failure begin to appear.

MINIMUM CLEARANCES

Side Air with RETURN AIR opening 24”

Side with SUPPLY AIR opening1

1. Overall dimension of the unit will vary if an electric heater, a

supply air plenum or a base is used.

24”

Side with PIPING CONNECTIONS2

2. This dimension is required for removal of the DX coil. Only 26”

is required for normal servicing.

61”

Side opposite PIPING CONNECTIONS3

3. If the DX coil has to be removed, this dimension is required to

loosen screws that secure the coil to the unit frame. This dimen-

sion will also be required for blower motor access if the piping

connections are made on the opposite side of the unit.

26”

Bottom4

4. Allow enough clearance to trap the condensate drain lines.

Unitary products group LA120 Installation guide

Brand: Unitary products group

Model: LA120

Category: Split-system air conditioners

Type: Installation guide

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Unitary products group LA120 Installation guide

Unitary products group LA120 Installation guide

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