LENNOX Evaporator Coils Manual L0806277

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

Open the PDF directly: View PDF PDF.
Page Count: 6

DownloadLENNOX  Evaporator Coils Manual L0806277
Open PDF In BrowserView PDF
INSTALLATION
INSTRUCTIONS

®
,1,_2008 Lennox
Dallas,

Industries

Inc,

Texas,

USA

CR33 Series Coils
EVAPORATOR
505,056M

COILS

_

Technical

LL.L[ Publications

04108

Litho U.S.A.

Supersedes 05/05

CR33 Series Coils .............................
General
.....................................
Shipping and Packing List ......................
Dry Air Charge Release ........................
Plenum Installation ............................
Coil Installation ................................
Condensate Drain .............................
Blower Speed Adjustment ......................
RETAIN THESE INSTRUCTIONS
REFERENCE

1
1
1
2
2
3
4
4

FOR FUTURE

WARNING

CAUTION

IMPORTANT

04/08

IIIHIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

CR33 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 installation 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 / expansion valve (ordered separately) is the only metering device 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.

Package 1 of 1 contains the following:
1 - CR33 evaporator coil
1 - Bag assembly containing:
3 - Straight coil Iocators (24B, 30/36B, 30/36C,
48C, 60D)
2 - Angular and 1 straight coil Iocator (18A,
24A, 30/36A, 48B, 50/60C)
6 - #8 Screws for fastening coil Iocators
1 - Liquid line stub (3/8" copper swedged)
1- O-ring
1 - Warranty/Installation Instructions
Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.

Page 1

505,056M

IIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

CAUTION
The CR33 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.
NOTE - If there is no pressure when the rubber plug is punctured, check the coil for leaks before installing the coil.

3. Sealing--Seal between the furnace cabinet and the
coil cabinet to prevent air leaks.

Loosen and remove the liquid line compression fitting. Remove and discard the plug which is in the distributor body.

4. As you lower the furnace onto the coil, align the
flanges of the furnace and the the coil cabinet.
Gas Furnace

A IMPORTANT

and Coil

GAS
FURNACE

See table 1 for the dimensions of the floor opening required
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
Floor Opening
CR33

Unit

1

to Side

19 (483mm)

SEAL BETWEEN
ADAPTER RAILS
AND FURNACE.

Front to Rear

USE STRAIGHT OR
i ANGULAR COIL
LOCATOR BRACKETS,
DEPENDING ON
:_._
MODEL AND
!
ALIGNMENT

23" (584mm)
-_

CAUTION
E--I,_=-]_2_1
_

REQUIREMENTS
X

I. Lower plenum through floor opening--Align the
the base of the unit with the matching plenum, then
lower the unit over the plenum. 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 3.

Figure

ASTEN BRACKETS
TO FURNACE AND
COIL CABINET WITH
#8 SCREWS

1

The refrigerant line sets should be sized according to the
recommendations given in the condensing unit installation
instructions (see table 2 for sweat connection sizes). A
field-provided adapter may be required to match line set
connections.
Table 2

BJ_ [_J_Jl_I_
Refrigerant

2, Coil Cabinet Width--Install the provided coil Iocator
brackets on the coil. Align the coil Iocator brackets with
the rear and sides of the coil cabinet. Figure 1 illustrates how the furnace, coil, and coil Iocator brackets
fit together.

Page 2
04/08

ALIGN THE COIL
LOCATOR BRACKET
WITH THE REAR AND
SIDES OF THE COIL
CABINET.

CR33 COIL

22-1/2"
(571mm)

-50/60C, -60D

505056M

COIL
LOCATOR
BRACKETS

14-1/4"
(394mm)

- 18A, -24A, -24B,
-30/36A, -30136B

I_'_/i_

0

Dimensions

Side

-30136C, -48B, -48C

o

Line Connection

CR33 Model

Suction (Vapor)
Line Sweat Size

-18, -24, -30/36

314(19.0)

-48,-60

7/8 (22.0)

Sizes - in (mm)
Liquid Line
Sweat Size

3/8(9.5)
3/8

Typical

1. Placea field-provided
heatshield,suchasa wetrag,
againstthepipingplateandaroundthepipingstubs,
andsweatinthesuctionline.Theheatshieldmustbe
inplacetoguardagainstheatdamagetothepaint.
2. Slidetheliquidlinecompression
nutontotheprovided
liquidlinestub.Insertthefield-supplied
liquidlineinto
theliquidlinestubforbrazing.
3. Brazeliquidlineand coilconnections.
Usea silver
alloybrazingrod(5or6 percentsilveralloyforcopperto-copperconnections
or 45 percentsilveralloyfor
copper-to-brass
orcopper-to-steel
connections).
4. Removetheheatshieldafterbrazingandallowthe
connections
tocool.
5. Selectthe appropriaterefrigerantmeteringdeviceRefrigerant
Valve.

Flow Control

Metering

Device Installation
NYLON SEAT

DISTRIBUTOR
TUBES

_

ORIFICE
or

ORIFICE
HOUSING

EXPANSION VALVE

O-RING

O-RING
STRAINER

_)
LIQUID LINE
STUB

Orifice or Expansion

SENSING
BULB
SUCTION LINE

Figure 2
Install either a Refrigerant Flow Control Orifice or (Check/)
Thermal Expansion Valve. Refer to outdoor unit bulletins
for approved metering device.
Refrigerant

Flow Control

Orifice

To install the Refrigerant Flow Control Orifice:
1. Ensure that the orifice is installed with the nylon seat
pointing toward the distributor (see figure 2).

Check / Thermal Expansion Valve
To install the Check/Thermal Expansion Valve:
1. Remove factory-installed metering orifice from orifice
housing (see figure 2).
2. Apply a small amount of refrigerant oil on the O-ring
(shipped with the valve assembly) and place it securely in the orifice housing.

2. Apply a small amount of refrigerant oil on the O-ring
and insert the O-ring securely into the orifice housing.
3. Screw the liquid line stub to the orifice housing. Tighten the compression fitting to 20 ft-lbs.
4. The suction line service port has no core. Make sure
that the service port cap is tightened securely.
5. Insulate the refrigerant lines at the connections to prevent sweating.
NOTE - Slide Armaflex insulation up to cabinet to
cover all of the suction line and seal cabinet opening.

3. Insert the expansion valve into the orifice housing and
tighten the expansion valve compression fitting.
4. Screw the liquid line compression nut (with the liquid
line) on the threaded end of the expansion valve. Tighten the fitting to 20 ft.qbs.
5. Install the expansion valve equalizer line on the suction line service port.
NOTE - Make sure that the equalizer line fitting is tightened securely.
6. Use the clamp provided with the valve assembly to secure the sensing bulb to the suction line.

Zi, IMPORTANT

IMPORTANT

Page 3
CR33

SERIES

Before connecting drain line(s), check drain hole(s) to
verify that drain opening is fully open and free of any debris. Also check to make sure that no debris has fallen into
the drain pan during installation that may plug up the drain
opening,

Proper air volume MUST be provided over the evaporator
coil. To ensure that the static pressure is within the proper
range, take a draft gauge reading as follows:

Make drain connections from the 3/4" (19 mm) pipe nipple
on pan with a 3/4" (19 mm) drain pipe. Route drain pipe
downward to an open drain or sump, Never connect drain
to a closed system.
Connect main condensate drain and route downward to an
open drain or sump. Do not connect drain to a closed waste
system. See figure 3 for typical condensate trap configuration.
Typical Condensate Drain
VENT MUST EXTEND
DRAIN

ABOVE

PAN BY 2 INCHES

THE HEIGHT

OF THE COIL"

(51 MM).

VENT

CAUTION
1, Remove access panel.
2. Drill two 5/16" (8 mm) air test holes in the right front
access panel; hole locations are shown in figure 4. Replace the panel,
3. Connect draft gauge. Zero end of draft gauge scale
connects to air entering hole of the coil. Insert gauge
hoses into test holes about 5/16" (8 mm), Seal around
holes with permagum,
4. Set the thermostat fan switch to ON position with no
heating nor cooling demand. Turn on power to the unit;
the furnace blower will begin operating,
Air Test Hole Locations

TRAP MUST BE DEEP ENOUGH TO OFFSET
MAXIMUM STATIC DIFFERENCE
(GENERALLY,
DRAIN PAN
2 INCHES [51MM]).

NOTE--Remove

panel

before drilling test holes.
DRAIN LINE SHOULD SLOPE
10 FEET (25 MM PER 3 M)

A MINIMUM

1 INCH PER
TO APPROVED

Figure

RIGHT FRONT
ACCESS PANEL

DRAIN

3

The following practices are recommended to ensure condensate removal:

+l

1-1/2"

1/2-4

•

Drain piping should not be smaller than the drain connections at drain pan.

•

A trap must be installed in the main drain line.

•

The trap must be deep enough to offset the difference
in static pressure between drain pan and atmosphere.
Generally, two inches is satisfactory for medium static
applications.

•

Horizontal runs must be sloped 1" (25.4mm) per 10'
(3m) of drain line to offset friction.

5. Table 3 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, decrease 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,

•

An open vent in the drain line, as illustrated in figure 3,
should be used to overcome line length, friction and static pressure.
Drains should be constructed in a manner to facilitate
future cleaning and not interfere with filter access as
illustrated in figure 3.

6. On belt drive blowers, check amperage draw on motor
by connecting an ammeter to one leg of the motor supply 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,

Auxiliary drain should run to an area where homeowner will notice it draining. The auxiliary drain line does
not required venting or a trap. Refer to local codes.

7. After required draft gauge readings are obtained, remove draft lines and seal air test holes,

•

•

Page 4
505056M

04/08

Figure 4

8. Set the room thermostat to desired temperature.

CR33 Coil Air Volume
Dry Coil
Model
No.
18A-F

24B-F

30/36B-F

48B-F

50/60C-F

Resistance
in.w.g.

Table 3
and Static

Pressure

Wet Coil

Air Volume
Pa

cfm

L/s

.05
.08

12
19

370
510

175
240

.10

25

645

.15

37

815

.20

50

.25

Resistance
in.w.g.

Resistance
Dry Coil

Air Volume

Model

Pa

cfm

L/s

No.

.05
.07

12
17

255
305

121
144

24A-F

305

.09

22

355

385

.12

30

395

980

465

.15

37

62

1115

525

.18

.30

75

1250

590

.35

87

1395

.40

100

.45

Resistance
Pa

cfm

L/s

.o5
.09

12
22

315
465

150
220

167

.14

35

595

186

.20

50

725

435

205

.25

62

44

520

245

.30

20

50

600

284

660

25

62

690

1535

725

.30

75

112

1645

775

.35

.50

125

1760

830

.55

137

1870

.06

15

.09

22

.13

Resistance

cfm

L/s

.05
.10

12
25

335
490

157
231

280

.15

37

600

284

345

.20

50

705

332

825

390

.25

62

790

373

75

910

430

.30

75

870

411

.35

87

1000

470

.35

87

940

444

325

.40

100

1080

510

.40

100

1020

481

775

365

.50

125

1225

580

.45

112

1090

514

86

845

399

.60

150

1370

645

.51

127

1160

547

.39

97

920

433

880

.50

125

1505

711

400

190

.07

17

400

189

.10

25

600

283

.10

25

600

283

500

235

.10

25

500

236

.13

32

700

330

.14

35

700

330

32

600

285

.15

37

600

283

.16

40

800

378

.18

45

800

378

.17

42

700

330

.20

50

700

330

.20

50

900

425

.23

57

900

425

.23

57

800

380

.26

65

800

378

.24

60

1000

472

.27

67

1000

472

.27

67

900

425

.32

80

900

425

.28

70

1100

519

.32

80

1100

519

.33

82

1000

470

.39

97

1000

472

.33

82

1200

566

.38

95

1200

566

.39

97

1100

520

.46

115

1100

519

.38

94

1300

614

.43

107

1300

614

.47

117

1200

565

.54

135

1200

566

.43

107

1400

661

.49

122

1400

661

.05

12

525

245

.05

17

600

283

310

.08

.06
.08

.07

660

194
233

285

19

410
495

600

.08

12
19

15
20

700

330

.10

25

700

330

.10

25

795

375

.10

25

580

273

.10

25

800

380

.13

32

800

378

.15

37

980

465

.15

37

785

371

.13

32

900

425

.17

42

900

425

.20

50

1165

550

.20

50

995

469

.16

40

1000

470

.21

52

1000

472

.25

62

1320

625

.25

62

1155

546

.19

47

1100

520

.25

62

1100

519

.30

75

1475

695

.30

75

1320

624

.22

55

1200

565

.29

72

1200

566

.35

87

1605

760

.35

87

1465

692

.26

65

1300

615

.34

85

1300

614

.40

100

1735

820

.40

100

1610

761

.29

72

1400

665

.38

95

1400

661

.43

107

1805

855

.45

112

1730

816

.46

115

1875

885

.50

125

1850

872

.14

35

1200

566

.17

42

1200

566

.05

12

595

280

.05

12

575

271

.16

40

1300

614

.20

50

1300

614

.10

25

860

405

.10

25

820

386

.19

47

1400

661

.23

57

1400

661

.15

37

1060

500

.15

37

995

469

.22

55

1500

708

.26

65

1500

708

.20

50

1235

580

.20

50

1170

551

.25

62

1600

755

.29

72

1600

755

.25

62

1395

655

.25

62

1320

623

.28

70

1700

802

.32

80

1700

802

.30

75

1545

730

.30

75

1445

682

.30

75

1800

850

.36

90

1800

850

.35

87

1675

790

.35

87

1575

744

.34

85

1900

897

.42

105

1900

897

.40

99

1805

850

.40

100

1710

807

.37

92

2000

944

.45

112

2000

944

.45

112.

1925

910

.45

112

1825

861

.50

124

2030

960

.50

125

1915

904

1395

660

.19

47

1400

661

30/36C-F

48C-F

in.w.g.

Air Volume
Pa

30/36A-F

in.w.g.

Wet Coil

Air Volume

.17

42

1395

660

.19

47

1400

661

.18

45

1450

685

.20

50

1450

684

.17
.18

42
45

1450

685

.20

50

1450

684

.19

47

1500

710

.22

55

1500

707

.19

47

1500

710

.22

55

1500

707

.20

50

1545

730

.23

57

1555

733

.20

50

1545

730

.23

57

1555

733

.21

52

1605

755

.24

60

1600

755

.21

52

1605

755

.24

60

1600

755

.22

55

1645

775

.25

62

1645

777

.22

55

1645

775

.25

62

1645

777

.24

60

1700

805

.27

67

1710

807

.24

60

1700

805

.27

67

1710

807

.25

62

1750

825

.28

70

1745

824

.25

62

1750

825

.28

70

1745

824

.27

67

1805

850

.31

77

1800

850

.27

67

1805

850

.31

77

1800

850

.28

70

1845

870

.32

80

1850

874

.28

70

1845

870

.32

80

1850

874

.29

72

1905

900

.33

82

1890

892

.29

72

1905

900

.33

82

1890

892

.30

75

1950

920

.34

85

1950

920

.30

75

1950

920

.34

85

1950

920

.32

80

2000

945

.36

90

2000

944

.32

80

2000

945

.36

90

2000

944

.33

82

2055

970

.38

95

2050

968

.33

82

2055

970

.38

95

2050

968

.35

87

2105

995

.40

100

2105

993

.35

87

2105

995

.40

100

2105

993

.38

94

2150

1015

.43

107

2150

1015

.38

94

2150

1015

.43

107

2150

1015

.39

97

2200

1040

.45

112

2190

1034

.39

97

2200

1040

.45

112

2190

1034

CR33

SERIES

60D-F

Page 5

A trained technician or service agency must perform maintenance and service on equipment. At the beginning of
each heating or cooling season, indoor coils should be
cleaned,

Cleaning the coil:
1. Remove the coil from the cabinet and take the coil to
an appropriate place to clean it,

Do not use hydrofluoric acid, alkaline, or similar chemicals
on coils. These chemicals are not necessary to dissolve
salt, and may damage the fin coating. Acid washes are
used to dissolve oils and greases, which generally are not
present on most installations,
Do not use alkaline washes to dissolve oxides such as zinc
oxide, aluminum oxide, and iron oxide (rust). These three
oxides are more corrosion-resistant than base metals. Dissolving or removing them will cause an increase in corrosion.

CAUTION

2. Vacuum or brush the coil to remove matted and surface debris from the fin. Use vacuum attachments and
/or brushes that are non-destructive to fins,
3. If oil deposits are present, spray the coil with ordinary
household liquid detergent, Allow detergent to soften
deposits. Wait 10 minutes,
NOTE - For units in coastal regions, fresh water will
dissolve salt deposits. (Wash coils with fresh water at
least every six months,)
,

5,

Spray the coil at a vertical angle of 30 to 45 degrees
with a constant stream of water at moderate pressure.
A pressure washer with a fan nozzle will work best, Do
not spray the coil from a horizontal direction,
Direct the spray so that any debris is washed out of the
coil and base pan, For most residential units, hot water
is not necessary,
NOTE - Attempting to back flush from the inside of the
coil will require removing parts from the unit, and it
may be very difficult to flush the whole coil surface. Attempting to blow water through a coil will slow the water stream and reduce the flushing action of the outer
fin surface.

6. Replace the coil into the cabinet,

Page 6
505056M

04_8



Source Exif Data:
File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.2
Linearized                      : No
Page Count                      : 6
Page Layout                     : SinglePage
Page Mode                       : UseNone
Producer                        : Goby Monitor Application version 4, 0, 0, 13
Create Date                     : Mon Jun 30 04:47:34 2008
Author                          : 
Title                           : 
Subject                         : 
EXIF Metadata provided by EXIF.tools

Navigation menu