LENNOX Evaporator Coils Manual L0806276

User Manual: LENNOX LENNOX Evaporator Coils Manual LENNOX Evaporator Coils Owner's Manual, LENNOX Evaporator Coils installation guides

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LENNOX

Dallas, Texas

INSTALLATION

INSTRUCTIONS

CR26 Series Coils

EVAPORATOR COILS

504,361M

4/2001

Supersedes 503,379M

F]_puTeCh nical

blications

Lithe U.S.A.

RETAIN THESE INSTRUCTIONS

FOR FUTURE USE

CR26 downflow evaporator coils are designed for use with

condensing units or heat pumps. Each coil is equipped with

a compression fitting that provides convenient field instal-

lation of a refrigerant metering device. Either a refrigerant

metering orifice (provided with some Lennox condensing

units) or a thermal expansion valve (ordered separately)

may be used in condensing unit applications. A check /ex-

pansion valve (ordered separately) is the only metering de-

vice approved for use in heat pump applications.

Refer to the Lennox Engineering Handbook for proper use

of these coils with Lennox furnaces, condensing units, heat

pumps and line sets.

These instructions are intended as a general guide and do

not supersede local codes in any way. Consult authorities

who have jurisdiction before installation.

ACAUTION

AWARNING

Package 1 of 1 contains the following:

1-CR26 evaporator coil

2-Adaptor rails for width adjustment only

1-Bag assembly containing

1 - Suction line 90° street elbow

1 - Heat shield

1 - Liquid line stub (3/8" copper swedged)

4- Screws

Check equipment for shipping damage. If you find any

damage, immediately contact the last carrier.

NOTE -If there is no pressure when the rubber plug is punc-

tured, check the coil for leaks before installing the coil.

The CR26 coils are shipped with a 10 psi dry air holding

charge. Puncture the suction line rubber plug to release the

charge. Remove the rubber plug.

Loosen and remove the liquid line compression fitting. Re-

move and discard the plug which is in the distributor body.

This releases the liquid line charge.

NOTE -If there is no pressure when the plugs are re-

moved, check the coil for leaks before installing it.

An adaptor may be necessary to match the furnace supply

opening with the inlet opening of the coil cabinet. Adaptor

rails are supplied to provide width adjustment. See tables

5, 6, 7, 8, and 9 for the coil/furnace match-ups with or with-

out transitions.

IMPORTANT

04/01

IIIHIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII Page 1

504,361M

IIIlllIIIIIIIIIIIIIIIIIIIIIIIIIIIWIIIIII

1- See table 1 for the dimensions of the floor opening re-

quired to accommodate the supply air opening and the

plenum. If the unit is installed against a wall, the rear

edge of the opening must be at least 1" (25 mm) from

the wall. Cut an appropriately sized opening,

Table 1

Floor Opening

Unit

CR26-18N, -30N, -36N

CR26-36W, -48N, -60N

CR26-48W

CR26-60W

Side to Side

14-1/4" (3.6 m)

19-1/4" (4.9 m)

24-1/4" (6.2 m)

Front to Rear

22-1/8" (5.6 m)

2- Lower the plenum through the floor opening. Align the

flanges on the base of the unit with the matching

flanges on the plenum, then lower the unit over the ple-

num. The coil cabinet must be level or sloped slightly

toward the drain outlet and secured and sealed to the

plenum, If the furnace and coil cabinet are the same

size, skip to step four.

Adjusting the Coil Cabinet Width

3- Install the provided adaptor rails or filler pieces on the

coil if necessary. Align the adaptor rails with the rear

of the coil cabinet. Figure 2 illustrates how the furnace,

coil, and adapter rails fit together,

G40/50 Furnace Applications -

Use the provided rails to match the coil to the furnace.

Refer to tables 5 through 9 for correct rail widths,

Place the adaptor rail flat on the top of the coil cabinet.

See figure 1, Bend the short flange up 90° at the perfo-

ration. Use the four provided screws to secure the rails

to the coil cabinet,

Adaptor Short

Adaptor Rail Rails Flange

Installation bend)

Align the adaptor

rail with the rear of

the coil cabinet.

Secure With

Two Screws

On Each Side

Figure 1

Gas Furnace with

Adaptor Rails and Coil

gas

furnace

Seal

between

adaptor

and furnace.

adaptor

rails

short flange the

(90° angle) rail

the rear

of the coil

CR26 cabinet.

coil

FILLER PIECES

Figure 2

Applications other than the G40/G50 -

If you use the CR26 coil with furnaces other than the

G40/G50, and the furnace's width is smaller than the

coil inlet opening, install filler pieces (field-provided).

See figure 3,

If the supply opening on the furnace is larger than the

evaporator cabinet inlet opening, use an adaptor and

furnace support (field-provided). See figure 4.

FURNACE I

FILLER PIECES

AIR FLOW

CR26

PLENUM

Figure 3

Seal between

filler pieces

and furnace.

Page 2

FURNACE

SUPPORT

FURNACE

,_ADAPTOR!

AIR FLOW

CR26

PLENUM

Seal between

furnace supports

Jand furnace.

Figure 4

ACAUTION

4- Seal between the furnace cabinet and the coil cabinet

to prevent air leaks.

5- As you lower the furnace onto the coil, align the flanges

of the furnace and the the coil cabinet,

The refrigerant line sets should be sized according to the

recommendations given in the condensing unit installation

instructions, Refer to table 2 for sweat connection sizes, A

field-provided adapter may be required to match line set

connections.

Table 2

Refrigerant Line Connections

Model No.

CR26-18 9.5

CR26-30,-36 9.5

CR26-48 9.5

CR26-60 9.5

Suction (Vapor)

Line Sweat Size

inches mm

5/8 15.9

3/4 19.0

7/8 19.0

1-1/8 28.6

Liquid Line

Sweat Size

inches

3/8

1 - Place a field-provided heat shield, such as a wet rag,

against the piping plate and around the piping stubs,

and sweat in the suction line. The heat shield must be

in place to guard against heat damage to the paint,

2 - Slide the liquid line compression nut onto the provided

liquid line stub. Insert the field-supplied liquid line into

the liquid line stub for brazing.

3- Braze liquid line and coil connections. Use a silver

alloy brazing rod (5 or 6 percent silver alloy for copper-

to-copper connections or 45 percent silver alloy for

copper-to-brass or copper-to-steel connections),

4- Remove the heat shield after brazing and allow the

connections to cool.

5 - Select the appropriate refrigerant metering device:

• refrigerant flow control orifice

• expansion valve

See the following sections: Refrigerant Flow Control

Orifice and (Check/) Thermal Expansion Valve. Follow

these sections and table 3 to install the appropriate meter-

ing device, See figure 5,

Typical Metering Device Installation

distributor orifice

tubes housing

orifice

valve OR orifice _

o-ring

expansion

valve (opt.)

strainer

liquid line

stub

suction line Sensing Bulb

Figure 5

Page 3

Refrigerant Flow Control Orifice

NOTE -A properly sized refrigerant flow control orifice may

be provided with the outdoor unit. Refer to table 3 to ensure

proper sizing of the refrigerant flow control orifice. An im-

properly sized flow control orifice can lead to diminished

capacities and/or efficiencies, as well as potential damage

to the unit.

• 10ACB and HS29 condensing units are shipped

with a matching metering orifice,

• See table 3 for the correct metering device match-

up.

a - Ensure that the orifice is installed with the nylon seat

pointing toward the distributor.

b - Apply a small amount of refrigerant oil on the O-ring

and insert the O-ring securely into the orifice housing,

c - Screw the liquid line stub to the orifice housing, Tight-

en the compression fitting to 20 ft-lbs,

d - The suction line service port has no core, Make sure

that the service port cap is tightened securely.

e - Insulate the refrigerant lines at the connections to pre-

vent sweating, Continue with step 7.

A IMPORTANT

(Check/) Thermal Expansion Valve

NOTE -Refer to table 3 to ensure selection of proper

(check/) expansion valve.

a - Remove factory-installed metering orifice from orifice

housing,

b - Apply a small amount of refrigerant oil on the O-ring

(shipped with the valve assembly) and place it secure-

ly in the orifice housing,

c - Insert the expansion valve into the orifice housing and

tighten the expansion valve compression fitting.

d - Screw the liquid line compression nut (with the liquid

line) on the threaded end of the expansion valve,

Tighten the fitting to 20 ft.-Ibs.

e - Install the expansion valve equalizer line on the suc-

tion line service port.

NOTE -Make sure that the equalizer line fitting is tight-

ened securely.

f - Use the clamp provided with the valve assembly to se-

cure the sensing bulb to the suction line. Continue with

step 7.

,& IMPORTANT

Page 4

Table 3 Table 3 (Continued)

CONDENSING UNIT /

HEAT PUMP

MODEL NO. TON-

NAGE

10ACB-12* 1

10ACB-18* 1.5

10ACB-24* 2

10ACB-30* 2.5

10ACB-36* 3

10ACB-42* 3.5

10ACB-48* 4

10ACB-60* 5

12ACB-24

HS26-24 2

HS27-24

12ACB-30

HS26-30 2.5

HS27-30

12ACB-36

HS21-36 3

HS26-36

HS27-36

12ACB-42

HS26-42 3.5

HS27-42

HS29-42"

HS21-48

HS26-48 4

HS21-60

HS26-60 5

HS26-18 1.5

HS29-12* 1

HS29-18* 1.5

HS29-24" 2

HS29-30" 2.5

HS29-36" 3

HS29-42" 3.5

HS29-48" 4

HS29-60" 5

HP29-18 1.5

HP29-24 2

HP29-30 2.5

METERING DEVICE

THERMALEXR

VALVE(TXV)/ CAT- ORIFICE

CHECKEXR ALOG SIZE

VALVE(CTXV) /NO.

ORIFICE (O)

O 42J35 .047

O 42J39 .055

O 66J87 .062

O 42J46 .068

O 42J48 .073

O 42J52 .080

O 42J54 .084

TXV 26K35 NA

O 42J58 .092

TXV 26K34 NA

TXV 26K35 NA

TXV 26K34 NA

TXV 26K49 NA

O 42J35 .047

TXV 26K49 NA

O 42J39 .055

TXV 26K49 NA

O 66J87 .062

TXV 26K34 NA

O 42J45 .067

TXV 26K34 NA

O 42J48 .073

O 42J51 .078

O 42J55 .086

O 42J61 .098

CTXV 56J19 NA

*Refrigerant metering orifice shipped with condensing unit.

**(Check)Expansion valve shipped with R410A condensing unit

or heat pump.

CONDENSING UNIT/ METERING DEVICE

HEAT PUMP

THERMAL EXR

MODEL NO. TON- VALVE(TXV)/CAT- ORIFICE

CHECK EXR ALOG

NAGE VALVE(CTXV) /NO. SIZE

ORIFICE (O)

HP29-36 3 CTXV 56J 19 NA

HP29-42 3.5 CTXV 56J20 NA

HP29-48 4 CTXV 56J20 NA

HP29-60 5 CTXV 56J20 NA

12HPB-24

HP26-24 2 CTXV 56J 19 NA

HP27-24

HS32-24"* 2 TXV 37L51 NA

HS32-30"* 2.5 TXV 37L51 NA

HS32-36"* 3 TXV 37L51 NA

HS32-42"* 3.5 TXV 39L72 NA

HS32-48"* 4 TXV 39L72 NA

HS32-60"* 5 TXV 39L72 NA

10HPB-18 1.5 CTXV 56J19 NA

10H PB-24 2 CTXV 56J 19 NA

10H PB-30 2.5 CTXV 56J 19 NA

10H PB-36 3 CTXV 56J 19 NA

10H PB-42 3.5 CTXV 56J20 NA

10HPB-48 4 CTXV 56J20 NA

10H PB-60 5 CTXV 56J20 NA

12HPB-24

HP26-24 2 CTXV 56J 19 NA

HP27-24

12HPB-30

HP26-30 2.5 CTXV 56J19 NA

HP27-30

12HPB-36

HP26-36 3 CTXV 56J 19 NA

HP27-36

12HPB-42

HP26-42 3.5 CTXV 56J20 NA

HP27-42

12HPB-48

HP26-48 4 CTXV 56J20 NA

HP27-48

12HPB-60

HP26-60 5 CTXV 56J20 NA

HP27-60

HP32-24"* 2 CTXV 49L24 NA

HP32-30"* 2.5 CTXV 49L24 NA

HP32-36"* 3 CTXV 49L24 NA

HP32-42"* 3.5 CTXV 49L25 NA

HP32-48"* 4 CTXV 49L25 NA

HP32-60"* 5 CTXV 49L25 NA

*Refrigerant metering orifice shipped with condensing unit.

**(Check)Expansion valve shipped with R4 IOA condensing unit

or heat pump.

Page 5

Makedrainconnectionsfromthe3/4"(19mm)pipenipple

onpanwitha 3/4"(19mm)drainpipe.Routedrainpipe

downwardtoanopendrainorsump,Neverconnectdrain

toa closedsystem.

Itisveryimportantthatproperairvolumebeprovidedover

theevaporatorcoil.Adraftgaugereadingmustbetakento

makesurestaticpressurefallswithintheproperrange.

1- Airtestholesmustbefieldprovidedintherightfront

accesspanel.

CAUTION--Remove panel before drilling holes.

Drill two 5/16" (8 mm) holes in locations shown in figure

6, Replace panel.

_ t,_____IRTEST HOLE LOCATIONS

t+ RIGHT FRONT

_ACCESS PANEL

+l 1-1/2' NO TE--Remove panel

t-1/2" --_ _T- before drilling test holes.

Figure 6

2- Connect draft gauge. Zero end of draft gauge scale

connects to air entering hole of coil. Insert gauge

hoses into test holes about 5/16" (8 mm), Seal around

holes with permagum,

3- Place the thermostat fan switch in continuous position

with no heating or cooling demand. Turn on power to

unit, and the furnace blower will begin operating,

4- Table 4 lists the range of air volumes and equivalent

draft gauge readings for this unit, Observe draft gauge

reading, If reading is above required air volume, de-

crease blower speed, Refer to furnace wiring diagram

for changing direct drive blower speed, Do not exceed

maximum air volume as indicated in diagram blower

speed table,

5- On belt drive blowers, check amperage draw on motor

by connecting an ammeter to one leg of the motor sup-

ply line, Compare this reading with the full load amps

listed on the motor nameplate. The motor pulley must

be adjusted not to exceed the motor nameplate full

load amps for motor listed,

6- After required draft gauge readings are obtained, re-

move draft lines and seal air test holes,

7- Set the room thermostat to desired temperature,

Table 4

Air Resistance

Air Volume

Mode! No. cfm L/s

500 235

600 285

CR26-18N 800 380

1000 470

800 380

1000 470

CR26-30N 1200 565

1400 660

800 380

1000 470

CR26-36N 1200 565

1400 660

1600 755

800 380

1000 470

CR26-36W 1200 565

1400 660

1600 755

1200 565

1400 660

CR26-48N 1600 755

1800 850

2000 945

1200 565

1400 660

CR26-48W 1600 755

1800 850

2000 945

1400 660

1600 755

1800 850

CR26-60N 2000 945

2200 1040

2400 1135

1400 660

1600 755

1800 850

CR26-60W 2000 945

2200 1040

2400 1135

2600 1225

Total Resistance

in. w.g. Pa

.02 5

.05 12

.12 30

.20 50

15 37

25 62

38 94

51 127

17 42

25 62

34 85

45 112

55 137

09 22

15 37

21 52

28 70

38 94

18 45

22 55

,28 70

33 82

40 100

14 35

18 45

23 57

29 72

35 87

20 50

26 65

32 80

39 97

46 115

55 137

14 35

17 42

22 55

27 67

32 80

37 92

43 107

Page 6

Furnace

Model

G40/50DF-24A-045

G40/50DF-36A-070

G40/50DF-36B-090

G40/50DF-48C-090

G40/50DF-48C-110

G40/50DF-60D-135

Table 5

Coil Model

CR26- CR26- *CR26- CR26- *CR26- CR26- *CR26- CR26-

18N-F 30N-2N 36N-F 36W-F 48N-F 48W-F 60N-F 60W-F

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Furnace

Model

Coil matches furnace size and air volume.

Coil matches air volume. Coil does not match the furnace size and requires a field-fabricated transition.

The coil does not match the furnace size.

3 - 3/16" adaptor rail supplied with the coil.

2 - 3/16" adaptor rail supplied with the coil.

NOTE -ff the application requires more air than a narrow (N) coil allows, use a wide (W) coil in the next column, ff wide coils

are used instead of narrow coils, a field-fabricated transition is necessary. Use the furnace adaptor rails provided with the

wide coils.

AM30Q2/3-70

AM30Q3/4-70

AM30Q3/4-90

AM30Q3/4-105

AM30Q4/5-90

AM30Q4/5-120

CR26-

18N-F

CR26- CR26-

30N-2N 36N-F

Table 6

Coil Model

CR26- I CR26-

36W-F t 48N-F

CR26-

48W-F

CR26-

60N-F

CR26-

60W-F

Coil matches air handler size and air volume.

Coil matches air volume. Coil does not match the air handler size and requires a field-fabricated

transition.

I The coil does not match the air handler size.

Furnace

Model

GHR26Q3-75

GHR26Q3/4-100

GHR26Q4t5-100

GHR26Q4t5-120

CR26- CR26- *CR26-

18N-F 30N-2N 36N-F

Table 7

Coil Model

CR26- I *CR26-

36W-F t48N-F

t CR26-

48W-F

*CR26-

60N-F

CR26-

60W-F

ICoil matches furnace size and air volume.

Coil matches air volume. Coil does not match the furnace size and requires a field-fabricated transition.

The coil does not match the furnace size.

NOTE -ff the application requires more air than a narrow (N) coil allows, use a wide (W) ceil in the next column, ff wide coils

are used instead of narrow coils, a field-fabricated transition is necessary. Use the furnace adaptor rails provided with the

wide coils.

Page 7

Furnace

Model CR26-

18N-F

CR26-

30N-2N

*CR26-

36N-F

Table 8

CR26-

36W-F

Coil Model

*CR26-

48N-F

CR26-

48W-F

*CR26-

60N-F

CR26-

60W-F

2-60

3-60

2-75

G24M 3-75

G24MX 4-75

80MGF

80MGFX 3/4-100

4/5-100

3/4-120

4t5-120

4t5-140

iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiil_

Coil matches furnace size and air volume.

Coil matches air volume. Coil does not match the furnace size and requires a field-fabricated transition.

The coil does not match the furnace size.

3 - 3/16" adaptor rail supplied with the coil.

2 - 3/16" adaptor rail supplied with the coil.

NOTE -ff the application requires more air than a narrow (N) coil allows, use a wide (W) coil in the next column, ff wide coils

are used instead of narrow coils, a field-fabricated transition is necessa_ Use the furnace adaptor rails provided with the

wide coils.

Furnace

Model

OHR23-Q3-150/120

OHR23-Q5-140/154

CR26- CR26-

18N-F 30N-2N

Table 9

Coil Model

CR26-

48W-F

CR26-

60N-F

CR26-

60W-F

Coil matches furnace size and air volume.

Coil matches air volume. Coil does not match the furnace size and requires a field-fabricated transition.

The coil does not match the furnace size.

Page 8

LENNOX Evaporator Coils Manual L0806276

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