Lennox CB28UH User Manual

LENNOX

INSTALLATION

,?,_2003 Lennox (ndustries inc.

Dallas, Texas, USA

CB28UH

Upflow Position

(WithOptionalElectncHeat)

INSTRUCTIONS

Merit®CB28UH

UPFLOW HORIZONTAL BLOWER COIL UNITS

504,739M 05/03

CB28UH Series Units ........................... 1

General ....................................... 1

Shipping & Packing List ......................... 1

Unit Dimensions ............................... 2

Requirements .................................. 4

Installation .................................... 4

Field Piping Connections ........................ 6

Condensate Drain .............................. 6

Filters ......................................... 7

Sealing the Unit ................................ 7

Blower Speed Adjustments ...................... 7

Electrical ..................................... 10

System Wiring Diagrams ....................... 11

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

TeCh nical

blications

Litho U.S.A.

The Lennox Merit® CB28UH series blower coil units are designed for installation with optional field-installed elec-

tric heat and a matched remote outdoor unit, These units are for indoor installation only.

The CB28UH units are designed for upflow/horizontal positional installations and are shipped (completely as- sembled) from the factory for upflow and horizontal right- hand discharge.

These instructions are intended as a general guide and do not supersede local codes in any way. Consult authori-

ties having jurisdiction before installation. Check equipment for shipping damage. If you find any

damage, immediately contact the last carrier.

CB28UH Series

Package 1 of I contains

1 - Assembled blower coil unit

IMPORTANT

• , WARNING

05/03

IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

504,739M

IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

3/4

(19)

LINE VOLTAGE LOW VOLTAGE

INLETS INLETS

(Top and Left Side) ,.,_!ght

TOP VIEW

SUPPLY

Top and

Side)

AUX,_,AR%'/--T.........

CONDENSATE

DRAIN (Upflow)

5/8

(16)

FILTER

ACCESS

o,o Lo,o

(16) F

Return Air

FRONTVIEW

i ,

(16)

OPTIONALELECTRIC

HEAT

f (Field

Installed)

SUCTION

L,NE_=_

LIQUID

LINE

DETAILOF PIPING PLATE

......

......................../ DRAINS (2)

I J_ c-_

(25)

CONDENSATE

(_ / mo_izontol)

CONDENSATE

DRAIN

(Upfl ow)

Return Air (16)

E ---------_ '_-

SlDE VIEW

A,N

UPFLOW POSITION

AUXILIARY DRAIN ON LEFT

MAIN DRAIN ON RIGHT

Model

5/8

CB28UH-018/024

No.

A 1334

B 540

C 575

D 502

E 533

F 508

CB28UH-030 inch mm

45-1/4 1149

16-1/4 413

20-5/8 524

14-3/4 375

19 483

15 351

CB28UH

CB28UH-036 CB28UH-042

inch mm

49-1/4 1251

21-1/4 540

20-5/8 524

19-3/4 502

19 483

20 508

CB28UH-048 CB28UH-060

inch

52-1/2

21-1/4

22-5/8

19-3/4

Torque Table

Part Recommended Torque

Blower Motor Bolts 48 in./Ibs. 5.42 NM

Blower Set Screw 155 in./Ibs. 17.51 NM

Drain Pan Plug 84 in./Ibs. 9.49 NM

TXV Chatleff Nuts 20 ft./Ibs. 27.11 NM

Sheet Metal 16 in Jibs. 1.80 NM

Machine Screws #10 28 in./Ibs. 3.16 NM

Page 2

DETAIL OF PIPING PLATE

CB28UH HORIZONTAL POSITION

(RIGHT-HAND AIR DISCHARGE)

FILTER

AUXILIARY CONDENSATE ( ) C ONDDREN SATE I\

I DRAIN (Horizontal) (Horizontal) I \

CB28UH HORIZONTAL POSITION

(LEFT-HAND AIR DISCHARGE)

3/4

(19)

3/4 f(19)

1;;, MAN 5

5/8 1 \

(16) (25) \

5/8 ACCESS

(16)

END VIEW

11-1/t6 LOW VOLTAGE TOP VIEW

INLETS

(Top and si8 -=114

LeftSide)/ (16) --II A

LIQUID

LINE

FILTER

OPTIONAL ELECTRIC HEAT

(Field Installed) SUCTION LINE

SUCTION LINE (Field installed)

TOP VIEW

FRONT VIEW

OPTIONAL ELECTRIC HEAT

FILTER

LIQUID

LINE

;l#p f AUXILIARY DRAIN ON LEFT

LINE VOLTAGE

INLETS

(16) Side)

all= _I- 518 (Top and Right

LOW VOLTAGE INLETS

(Bottom and Right Side)

DETAIL OF PIPING PLATE

END VIEW

I- .......... 1

MAIN DRAIN ON RIGHT

11-1/16

3/4

(19)

f 3/4

.__1

(19)

FILTER

3/4

(19)

............ I

Model

END VIEW

No.

LINE V )LTAGE INLETS

(Bottom and Left Side)

inch mm inch mm inch mm inch mm inch mm inch mm

AUXILIARY

DRAIN

FRONT VIEW

A B C D E F

MAIN

CONDENSATE 215 518

DRAIN ( ) (16)

(Horizontal)

END VIEW

CB28UH-018/024

CB28UH-030 45-1/4 1149 16-1/4 413 20-5/8 524 14-3/4 375 19 483 15 351 CB28UH-036

CB28UH-042 49-1/4 1251 21-1/4 540 20-5/8 524 19-3/4 502 19 483 20 508 CB28UH-048

CB28UH-060 52-1/2 1334 21-1/4 540 22-5/8 575 19-3/4 502 21 533 20 508

Page 3

(16)

518

InstallationofLennoxblowercoilunitswithorwithoutop- tionalelectricheatmustconformwithstandardsintheNa-

tionalFireProtectionAssociation(NFPA)"Standardfor InstallationofAirConditioningandVentilationSystems NFPANo,90A,"and"StandardforInstallationof Resi- denceTypeWarmAirHeatingandAirConditioningSys- temsNFPANo.90B,"manufacturer'sinstallationinstruc- tionsandlocalmunicipalbuildingcodes,

Thisunitiscertifiedforinstallationclearancestocombus- tiblematerialaslistedontheunitratingplate,

CB28UHunitsarefactory-configuredforupfloworhori- zontalright-handdischargeinstallation,Forhorizontal left-handdischarge,somefieldmodificationisrequired.

ACAUTION

Upflow Application

1 - Remove access panel. Remove corrugated padding

from the space between the blower and coil assem-

blies.

2 -To ensure proper operation, remove the horizontal

drain pan from units in upflow configurations,

3 -Place unit in desired location. Make sure that unit is

level. Connect return and supply air plenums as re- quired using sheet metal screws, See figure 1,

UPFLOW CONFIGURATION

HORIZONTAL

DRAIN PAN*

UPFLOW/

DRAIN PAN

*FOR OPTIMUM PERFORMANCE,

REMOVE HORIZONTAL DRAIN PAN.

FIGURE 1

Horizontal Right-Hand Discharge Application

1 -Remove access panel. Remove corrugated padding

from the space between the blower and coil assem- bly.

2 -No further adjustment is necessary. Set unit so that it is

sloped 1/4 inch toward the drain pan end of the unit.

NOTE - For horizontal applications, an auxiliary drain pan is required. Refer to local codes. NOTE - For horizontal applications in high humidity

areas, seal around the exiting drain pipe, liquid line and suction line to prevent infiltration of humid air.

RIGHT-HAND DISCHARGE CONFIGURATION

NO ADJUSTMENT IS NECESSARY

UPFLOW/DRAIN PAN HORIZONTAL

4 - Mount units that have no retum air plenum on a stand

at least 14" from the floor for proper air return. Lennox offers an optional upflow unit stand. (45K31 for CB28UH-018, 024, 030; 45K32 for CB28UH-036 through -060.)

DRAIN PAN

FIGURE 2

Page 4

3-If theunitisto besuspended,itmustbesupported

alongtheentirelengthofthecabinet.If youusea strap,attachapieceofangleironorsheetmetaltothe

unit(eitheraboveorbelow)sothatthefulllengthof thecabinetissupported.Usesecuringscrewswhich arenolongerthan1/2inchtoavoiddamagingthecoil orfilter,Seefigure3.Connectthereturnandsupply airplenumsasrequiredusingsheetmetalscrews,

SUSPENDINGHORIZONTALUNIT

1/2 in Screws max. Electrical Inlet

SHEET METAL

I I I

tl " I I II

FRONT VIEW END VIEW

FIGURE 3

Clearance

8 -Rotate top cap 180°front to back and align with un-

used screw holes, Holes must align with front and back coil end plates. Note that top cap has a 45° bend

on one side and 90° bend on the other. The 90° bend must be on the same side as the horizontal drain

pan. See figures 4 and 5,

NOTE - Use extreme care when re-installing screws into coil end plate engaging holes. Misaligned screws may damage coil.

9 -Remove the condensate shield from the right front

and install it on the left front as shown in figure 4,

FIELD MODIFICATION FOR

LEFT-HAND DISCHARGE

CABINET

90°

BEND

CAUTION

Horizontal Left-Hand Discharge Application

NOTE - For horizontal applications, an auxiliary drain pan is required. Refer to local codes.

1 - Remove access panel. Remove corrugated padding

from the space between the blower and coil assembly

before operation.

2-Pull coil assembly from unit, Pull off the horizontal

drain pan,

3 -Remove drain plugs from back drain holes on hori-

zontal drain pan and reinstall them on front holes.

4 -Rotate drain pan 180° front to back and install it on the

opposite side of coil. Follow the instruction steps with the corresponding numbers in figure 4.

5-Remove screws from top cap, Remove horizontal

drip shield screw located in the center of the back coil end seal. See figure 4,

6 -Rotate horizontal drip shield 180° front to back. 7-Remove plastic plug from left hole on coil front end

seal and reinstall plug in back hole. Re-install horizon- tal drip shield screw in front coil end seal, Drip shield should drain downward into horizontal drain pan inside coil, See fgure 4,

COIL SHOWN IN UP-FLOW POSITION

FOR EASY CONVERSION

FIGURE 4

BACK COIL

90 ° BEND

FIGURE 5

10 -From the upflow position, flip cabinet 90° to the left

and set into place. Put coil assembly back in place, Secure coil in place by putting the cabinet support rail back in place, See figures 4 and 6,

LEFT-HAND DISCHARGE CONFIGURATION

SECURING FLANGE ON HORIZONTAL

CABINET SUPPORT RAIL DRIP SHIELD

FIGURE 6

END SEAL

HORIZONTAL

DRAIN PAN

Page 5

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