LENNOX Evaporator Coils Manual L0806270

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

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,t_2007 Lennox Industries Inc.

DatIas, Texas, USA

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

WARNING

CAUTION

AIMPORTANT

10/07

IIIHllllll]]lll]llllllllll]lllllllll]

INSTALLATION

INSTRUCTIONS

C33/CX34 Series Coils

EVAPORATOR COILS _ Technical

505,060M (65594205) LL.L[Publications

10/07 Litho U.S.A.

Supersedes 06/07

C33 and CX34 Series Coils ..................... 1

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

Shipping and Packing List ...................... 1

Releasing Air Charge .......................... 2

Unit Installation ............................... 2

Refrigerant Line Set ........................... 3

Replacement Parts ............................ 4

Connections .................................. 4

Refrigerant Metering Device .................... 5

Leaking Testing, Evaculating and Charging ....... 7

Sealing Ducts ................................. 7

Condensate Drain Connection .................. 7

Blower Speed Connection ...................... 8

Maintenance .................................. 9

C33 and CX34 upflow evaporator coils are designed to be

used with air conditioner or heat pump units. C33 coils

include a factory-installed fixed orifice metering device and

are available cased or uncased. CX34 coils include a

factory-installed, HFC-410A check (CTXV - heat pumps)

or thermostatic (TXV - air conditioner units) expansion

valve (externally equalized) and are only available cased.

Refer to the Lennox Engineering Handbook for the proper

use of these coils with Lennox furnaces, air conditioner

units, heat pumps, and line sets.

These instructions are intended as a general guide and do

not supersede local or national codes in any way.

Authorities who have jurisdiction should be consulted

before installation.

Package 1 of 1 contains the following:

C33

1 -- Evaporator coil

1 -- Patch plate with nameplate label (uncased coils only)

1 -- Metering device label (uncased coils only)

CX34

1 -- Evaporator coil

Check the components for shipping damage. If you find

any damage, immediately contact the last carrier.

Page 1 505,060M (65594205)

II]lllllllll]llllllllHlllllllllll]]lllll

Table 1. Orifice Size Shipped with C33 Units

Model C33 (Case/and Uncase) Orifice Size

C33-18A-2/(2-F) 0.053

C33-19A-2/(2-F) 0.053

C33-24A-2/(2-F) 0.062

C33-24B-2/(2-F) 0.062

C33-24C-2/(2-F) 0.062

C33-25A-2/(2-F) 0.062

C33-25B-2/(2-F) 0.062

C33-30A-2/(2-F) 0.071

C33-30B-2/(2-F) 0.071

C33-30C-2/(2-F) 0.071

C33-31A-2/(2-F) 0.071

C33-31B-2/(2-F) 0.071

C33-36A-2/(2-F) 0.076

C33-36B-2/(2-F) 0.076

C33-36C-2/(2-F) 0.076

C33-38A-2/(2-F) 0.076

C33-38B-2/(2-F) 0.076

C33-42B-2/(2-F) 0.082

C33-43B-2/(2-F) 0.082

C33-43C-2/(2-F) 0.082

C33-44C-2/(2-F) 0.082

C33-48B-2/(2-F) 0.091

C33-48C-2/(2-F) 0.091

C33-49C-2/(2-F) 0.091

C33-50/60C-2/(2-F) 0.091

C33-60D-2/(2-F) 0.099

C33-62C-2/(2-F) 0.099

C33-62D-2/(2-F) 0.099

a CAUTION

The C33 and CX34 coils are shipped with a 15 + 3 psi dry

air holding charge. Ensure that the coil is void of pressure

by performing the following procedure:

1. Remove valve stem cap,

2. Press the liquid line valve stem.

505060M 10_7

Page 2

NOTE -If there is no pressure when the valve core is

pressed, check the coil for leaks before continuing with the

installation.

a WARNING

Install the furnace or air handler according to the

installation instructions provided with the unit.

Cased C33 or CX34 Coils - Position the cased coil on top

of the furnace or air handler cabinet and secure it using

field-provided screws,

NOTE - Cased coils have six screw clearance holes which

should be aligned with the furnace engagement holes.

Secure the coil casing to the furnace using six

field-provided #8 X 1" screws.

NOTE -An optional adapter base (ordered separately) is

available for use with uncased coils. Order Lennox part no.

81J46 for a single adapter as illustrated in figure 1, and

11L09 for a package of 10 adapters.

NOTE -Figure 2illustrates how to place the uncased coil

into the air duct.

Note: *C33-18A through

C33-62C coils are positioned

on the furnace cabinet

front-to-rear, as shown,

C33-60D and C33-62D are

positioned left-to-right on the

furnace.

DUCT

PATCH PLATE __

ADAPTER BASE

(OPTIONAL-USEDIN

UNCASED COILS ONLY)

FURNACE

Figure 1. Adapter Base

DUCT (FIELD INSTALLED)

COIL SUPPORT - FIELD

INSTALLED - (USED WITH

UNCASED COILS ONLY)

UNCASED COIL*

Note: *C33-18A through C33-62C

coils are positioned on the furnace

cabinet front-to-rear, as shown,

C33-60D and C33-62D are

positioned left-to-right on the

furnace.

Figure 2. Field-Installed Coil Support

Installing Patch Plate (Uncased Coils Only - C33) -A

two-piece patch plate and metering device label are

provided (taped to the top of the coil), To install the plate:

NOTE -Either models (C33 or CX34) could be configured

as illustrated in either figure 10 or 11,

1. Carefully pull the orifice housing forward through the

patch plate opening in the plenum. Do not twist, kink

or damage the distributor tubes. Use wire ties to

secure tubes to prevent movement that could cause

the refrigerant tubing to fail. Adjust the tubes if

necessary as illustrated in figures 3 and 4.

AIMPORTANT

PIPES.

Figure 3. Secure Distributor Tubes to Pipes

_B DISTRIBUTOR TUBES

DO NOT LEAVE DISTRIBUTOR

ES UNSECURED.

USE WIRE TIRES TO SECURE THE DISTRIBUTOR TUBES TOGETHER.

WIRE TIES

Figure 4. Secure Distributor Tubes Together

2. Position the orifice housing with the patch plate as

illustrated in either figure 10 or 11. Carefully install two

#8 X 1/2" sheet metal screws through the patch plate

into the orifice housing mounting base. The distributor

lines must not be twisted or kinked,

3. Install the patch plate onto the plenum.

4. Affix metering device label to front of plenum.

The refrigerant line sets should be sized according to the

recommendations given in the air conditioner unit

installation instructions. Use either table 2 or 3 to

determine correct braze connection sizes. A field-provided

adapter may be required to match line set connections.

Page 3

C33/CX34 SERIES

Table 2. Refrigerant Line Connections - Model C33

Model Number Suction Liquid

18-2(F)

19-2(F)

24-2(F), -24C-2, -24C-2(F)

25-2(F)

30-2(F), -30C-2, -3OC-2(F)

31-2(F)

36-2(F)

38-2(F)

42-2(F)

43-2(F)

44-2(F)

48-2(F)

49-2(F)

60/60-2(F)

60-2(F)

62C-2(F)

62-2(F)

Line

Sweat

Size -

3/4 Inch

(19mm)

Line

Sweat

Size -

7/8 Inch

(22mm)

Line

Sweat

Size -

3/8 Inch

(9.5mm)

Table 3. Refrigerant Line Connections - Model CX34

Model Number Suction Liquid

18/24-6F

19-6(F)

24-6(F), -24C-6(F)

25-6(F)

30-6E -3OC-6(F)

31-6(F)

36-6(F)

38-6(F)

42-6(F)

43-6(F)

44/48-6(F)

49-6(F)

50/60-6(F)

60-6(F)

62-6(F), -62C-6(F)

Line

Sweat

Size -

3/4 Inch

(1gram)

Line

Sweat

Size -

7/8 Inch

(22ram)

Line

Sweat

Size -

3/8 Inch

(9.5mm)

If replacement parts are necessary, order kit 69J46. The kit

includes:

• 10 -- Brass nuts for liquid line assemblies

• 20 -- Teflon rings

• 10 -- Liquid line orifice housings

• 10 -- Liquid line assemblies

PISTON

LIQUID LINE ORIFICE HOUSINGS (10) J RETAINER

/TEFLON RINGS (20)

//BRASS NUTS (I 0)

"_ E] L_ _" STRAINER

] ]--O%ER

L,QU,DUNEASSEMSL,ES

(INCLUDES STRAINER) (10) LIQUID LINE

ASSEMBLY

Figure 5.69J46 Kit Components

Use a silver alloy brazing rod (5 or 6 percent silver alloy for

copper-to-copper connections or 45 percent silver alloy for

copper4o-brass or copper-to-steel connections).

C33/CX34 -- BRAZE SUCTIONNAPOR LINE

Use the following procedure to connect the vapor line to

the indoor coil unit:

1. Remove rubber plug.

2. 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 protect the paint from heat damage.

3. Braze connection.

4. Remove the heat shield after brazing and allow the

connections to cool.

C33 -- CONNECT LIQUID LINE

Use the following procedure to connect the liquid line to the

indoor coil unit:

1. Slide the liquid line compression nut onto the provided

liquid line fitting (the liquid line fitting comes attached

to the front of the delta plate of the uncased coils).

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

stub for brazing.

CX34 -- CONNECT LIQUID LINE

Use the following procedure to connect the liquid line to the

indoor coil unit. Connect the field-provided liquid line to the

liquid line of the cased coil as illustrated in figure 6 using

one of the following procedures:

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

against the piping plate and around the piping stubs,

and braze in the liquid line. The heat shield must be in

place to protect the metering device from heat

damage.

2. Braze the brass seal assembly out of the swedged

copper liquid line on the coil; braze field-provided liquid

line into the swedged connection.

3. Cut the copper liquid line on a vertical or horizontal

section. Use a field-provided coupling to join the field

liquid line and coil liquid line connections.

4. Remove the heat shield after brazing and allow the

connections to cool.

REMOVE AND DISCARD

STEM ASSEMBLY

(IF PRESENT)

CUT TWO INCHES UP \

COIL LIQUID LINE

UNBRAZE AT FITTING

SWEDGED CONNECTION

CUT TWO INCHES OUT

COUPLING

Note: Use the coupling at either of the two cut connections.

Figure 6. Liquid Line Connections

505060M 10/07

Page 4

Beloware the factory-installedmeteringdevicesand

optionalmeteringdevicesif applicableto bothtypesof

coils.

• TheC33coilsareshippedwithafactory-installedfixed

orifice.C33casedanduncasedcoilsarecompatible

with eitherHFC-410Afixed orificeor TXV/CTXV

meteringdevices,

• CX34casedcoilshavefactory-installedHFC-410A

TXV/CTXVmeteringdevices,

ThepreviouslyreferenceTXV/CTXVmeteringdeviceswill

bereferredto inthisinstructionasTXV,

DETERMININGCORRECTFIXEDORIFICE

A properlysizedfixedorificemaybe providedwiththe

outdoorunit.Refertotheoutdoorunitinstructiontoensure

propersizingof the refrigerantflow controlorifice.An

improperlysized RFCorificecan lead to diminished

capacitiesand/orefficiencies,aswellaspotentialdamage

totheunit,RFCsshippedwiththecoilsareidentifiedin

table1.

I_I/8 TURN

I/2TURN

Figure 7. Tightening Distance

C33 - TYPICAL FIXED ORIFICE REMOVAL

PROCEDURE

1. On fully cased coils, remove the coil access and

plumbing panels.

2. Remove any shipping clamps holding the liquid line

and distributor assembly,

3. Using two wrenches, disconnect liquid line from

distributor. Take care not to twist or damage distributor

tubes during this process,

4. Remove and discard orifice, valve stem assembly if

present and Teflon ring as illustrated in figure 8.

5. Retain brass nut to be using later with the liquid line

assembly.

DISTRIBUTOR TUBES

LIQUID LINE ORIFICE HOUSING

TEFLON RING REMOVE AND DISCARD

ORIFICE VALVE STEM ASSEMBLY

(IF PRESENT)

BRASS NUT

VALVE STEM

VALVE STEM CAP

LIQUID LINE ASSEMBLY

(INCLUDES STRAINER)

(Uncased Coil Shown)

Figure 8. Typical Fixed Orifice Removal

C33 - TYPICAL FIXED ORIFICE INSTALLATION

PROCEDURE

1, Ensure that the orifice is installed with the nylon seat

pointing toward the liquid line orifice housing,

,Insert the Teflon ring securely into the liquid line orifice

housing. Lightly lubricate the threads of the liquid line

orifice housing and the expose surface of the Teflon

ring,

,Connect the liquid line assembly with the brass nut to

the liquid line orifice housing. Finger tighten and use an

appropriately sized wrench to turn an additional 1/2

turn clockwise as illustrated in figure 7, or 20 ftqb,

4. Place the supplied fixed orifice sticker on the indoor

cabinet after installation.

Figure 9. Typical Fixed Orifice Installation

Page 5

C33/CX34 SERIES

C33 - TYPICAL TXV INSTALLATION PROCEDURE

The TXV unit can be installed internal or external to the

indoor coil. In applications where an uncased coil is being

installed in a field-provided plenum, install the TXV in a

manner that will provide access for field servicing of the

TXV. Refer to figures 10 or 11 for reference during

installation of TXV unit.

(Uncased Coil Shown)

TWO PIECE

PATCH PLATE LIQUID LINE

UNCASED COIL ORIFICE STUB END

ONLY) HOUSING

DISTRIBUTOR TXV

TUBES

RING

SENSING

LINE

MALE EQUALIZER LINE

FITTING (SEE FIGURE

13 FOR FURTHER

DETAILS)

Sensing bulb insulation is

required if mounted external to

the coil casing. See figure 12 for

bulb positioning.

LIQUID

LINE

Figure 10. Patch Plate (Configuration A)

(uncased coil shown)

MALE EQUALIZER LINE

FITTING (SEE FIGURE

13 FOR FURTHER

DISTRIBUTOR

TUBES

,PIECE PATCH PLATE

Sensing bulb insulation is

required if mounted external

VAPOR LINE to the coil casing. See figure

f 12 for bulb positioning,

S_BNuSIBN _ "UB END

SENSING

TXVTEFLON

RING

TEFLON

RING

LIQUID LINE

ORIFICE

HOUSING

LIQUID LINE ASSEMBLh

WITH BRASS NUT

Figure 11. Patch Plate (Configuration B)

1, Insert one of the provided Teflon rings into the stubbed

end of the TXV, Lightly lubricate the threads of the

stubbed end of the TXV and the expose surface of the

Teflon ring.

2, Attach the stubbed end of the TXV to the liquid line

orifice housing, Finger tighten and use an appropriately

sized wrench to turn an additional 1/2 turn clockwise

as illustrated in figure 7, or 20 ft-lb,

3, Place the remaining Teflon washer around the other

end of the TXV and lightly lubricate the threads of the

that end of the TXV, and the expose surface of the

Teflon ring,

4, Attach the liquid line assembly with brass nut to the

TXV. Finger tighten and use an appropriately sized

wrench to turn an additional 1/2 turn clockwise as

illustrated in figure 7, or 20 ft-lb,

5, Attach the sensing bulb of the TXV in the proper

orientation as illustrated in figure 12 to the suction line

using the clamp and screws provided.

On lines smaller than

Suction Line .. 7/8", mount sensing bulb

at either the 3 or 9 o'clock

(Bu,b Bu,b)

On 7/8" and larger lines,

Suction Line _ mount sensing bulb at

_.___ _.,/_/either the 4 or 8 o'clock

• _. position, never mount on

,_, , \\ bottom of line.

O" I "_\\_q I

NOTE -Never mount on bottom of line.

Figure 12. TXV Sensing Bulb Installation

NOTE -To prevent any possibility of water damage,

properly insulate all parts of the TXV assembly that may

sweat due to temperature differences between the valve

and its surrounding ambient temperatures.

6. Connect the equalizer line from the TXV to the

equalizer suction port on the suction line. Finger

tighten the flare nut plus 1/8 turn (7 ft-lbs) as illustrated

in figure 7.

XkIMPORTANT

505060M 10/07

Page 6

FLAREcApSEAL _._ _FLARE NUT

,_ COPPER

OR --FLARE SEAL

BONNET

I (REMOVE)

-- MALE BRASS EQUALIZER

_ LINE FITTING

SUCTION LINE

Figure 13. Copper Flare Seal Bonnet Removal

See the C33/CX34 Engineering Handbook for approved

TXV match-ups and application information, Typically, the

TXV kits include the following:

1 -- TXV

2 -- Teflon rings

1 -- 1 1/4" wide copper mounting strap for sensing bulb

2 -- #10 hex head bolts and nuts for securing sensing bulb

%1%51(°?s

@ TEFLON

RINGS (2)

COPPER

MOUNTING

STRAP (I)

Figure 14. TXV Kit Components

Refer to the outdoor unit instruction for leak testing,

evacuating and charging procedures, Always leak check

entire system before charging,

Ensure the duct is secured and all joints are properly

sealed to either the coil cabinet flanges (fully cased

models) or the furnace cabinet flanges (uncased models),

C33(F) and CX34(F) coils have both main and auxiliary

drain connections, The auxiliary drain removes

accumulated condensate if the main drain becomes

plugged,

AIMPORTANT

VENT MUST EXTEND ABOVE THE HEIGHT OF THE COIL"

DRAIN PAN BY 2 INCHES (51 MM). VENT

DRAIN PAN

TRAP MUST BE DEEP ENOUGH TO OFFSET

MAXIMUM STATIC DIFFERENCE (GENERAL

2 INCHES [51MM]).

TRAP (49P66)

DRAIN LINE SHOULD SLOPE A MINIMUM 1 INCH PER

10 FEET (25 MM PER 3 M) TO APPROVED DRAIN

Figure 15. Typical Condensate Drain Connection

1, Install a trap in both drain lines per local codes, Ifa vent

tee is required to reduce friction and static pressure,

the trap should be installed between the unit outlet and

the vent tee as illustrated in figure 15,

2, Make drain connections at the 3/4" female threaded

pipe using condensate lines dthe same size. Pitch the

main drain line down to an open drain or sump.

3, If the auxiliary drain line is to be used, remove the plug

and route the drain line so that water draining from the

outlet will be easily noticed by the homeowner.

4, After removal of drain pan plugs, check the drain port

to see if holes have been drilled. If not drilled, use a

19/32" bit to drill out the primary drain hole; use a 3/8"

drill bit for the secondary drain hole, Remove all drill

shavings.

5, Make sure drain ports and drain pan are free of all

debris.

6, Plug and check any unused drain pan openings for

tightness. Tighten plugs to 1/8 tum or 7 ft-lb, to prevent

water leaks or seepage from the drain pan,

Page 7

C33/CX34 SERIES

TESTHOLES

LEFT-HANDAIRDISCHARGE

(TOPVlEW)

Figure 16. Static Pressure Test

CAUTION

Proper air volume must be provided over the evaporator

coil. Select a blower motor speed tap that will provide 400 _+

50 CFM per 12,000 Btuh of cooling capacity (wet coil). A

static pressure reading must be taken to see if the pressure

drop falls within the proper range,

To ensure accuracy, air must be read from below the coil

and above the coil. See figure 16 for an example to obtain

an accurate reading,

1. Drill one 5/16" (8 mm) air test hole into the delta plate

between the coil slabs,

2. Drill one 5/16" (8 mm) air test hole into the duct above

the top of the coil,

3. Connect the instrument for static pressure

measurement hoses to the air entering side of coil.

Insert the hoses so that 1/4" (6 mm) extends inside the

duct or end seal, Seal around holes with Permagum,

4. Turn on electrical power to the furnace and set the

thermostat to initiate a cooling demand.

5. Tables 4 and 5 lists the range of air volumes and

equivalent static pressure readings for these units.

Observe the static pressure reading. If the reading is

below the required air volume, increase the blower

speed; if the reading is above the required air volume,

decrease the blower speed. Refer to the furnace

wiring diagram for blower speed settings,

6. When the required static pressure readings are

obtained, remove the test hose lines and insert

snaphole plugs into test holes,

Table 4. Air Volume /Static Pressure Drop Across

Coil - Model C33

Cabinet Drop:

Voh CFM

Model

18A-2(F)

19A-2(F)

24A-2(F)

24B-2(F)

24C-2(F)

25A-2(F)

25B-2(F)

30C-2(F)

30A-2(F)

30B-2(F)

31A-2(F)

31B-2(F)

36A-2(F)

36B-2(F)

38A-2(F)

38B-2(F)

36C-2(F)

42B-2(F)

43B-2(F)

43C-2(F)

44C-2(F)

48B-2(F)

48C-2(F)

49C-2(F)

50/60C-2(F)

60D-2(F)

62C-2(F)

62D-2(F)

Width in.

(ram)

14-1/2 (394)

17-1/2 (444)

21 (533)

14-1/2 (394)

17-1/2 (444)

21 (533)

14-1/2 (394)

17-1/2 (444)

14-1/2 (394)

17-1/2 (444)

14-1/2 (394)

17-1/2 (444)

14-1/2 (394)

17-1/2 (444)

21 (533)

17-1/2 (444)

21 (533)

17-1/2 (444)

21 (533)

24-1/2 (622)

(L/s) Dry

600 (285) .14 (35)

6OO (285) .O8 (2O)

8O0 (38O) .18 (45)

800 (380) .16 (40)

800 (380) .11 (27)

1000 (470) .20 (50)

1000 (470) .22 (55)

1000 (470) .18 (45)

1000 (470) .13 (32)

1200 (565) .27 (67)

1200 (565) .17 (42)

1200 (565) .27 (67)

1200 (565) .17 (42)

1400 (660) .22 (55)

1400 (660) .23 (57)

1400 (660) .13 (32)

1400 (660) .18 (45)

1600 (755) .17 (42)

1600 (755) .23 (57)

1600 (755) .17 (42)

1600 (755) .23 (57)

2000 (945) .21 (52)

2000 (945) .29 (72)

2000 (945) .21 (52)

in. w.g. (Pa)

Wet

.17 (42)

.09 (22)

.25 (62)

.22 (55)

.15 (37)

.28 (70)

.3O(75)

.2O(50)

.16 (40)

.3O(75)

.21 (52)

.3O(75)

.21 (52)

.28 (70)

.24 (60)

.16 (40)

.23 (57)

.21 (52)

.29 (72)

.22 (55)

.29 (72)

.27 (67)

.34 (85)

.27 (67)

505060M 10/07

Page 8

Table 5. Air Volume /Static Pressure Drop Across

Coil - Model CX34

Model

Vol: CFM

(L/s)

Cabinet

Width in.

(mm)

14-1/2 (394)

17-1/2 (444)

21 (533)

14-1/2 (394)

17-1/2 (444)

14-1/2 (394)

17-1/2 (444)

14-1/2 (394)

17-1/2 (444)

14-1/2 (394)

17-1/2 (444)

14-1/2 (394)

17-1/2 (444)

21 (533)

17-1/2 (444)

21 (533)

17-1/2 (444)

21 (533)

24-1/2 (622)

18/24A-6(F) 800 (380) .25 (62)

19A-6(F) 600 (285) .09 (22)

24B-6(F) 800 (380) .25 (62)

24C-6(F) 800 (380) .22 (55)

24B-6(F) 1000 (470) .28 (70)

25A-6(F) 800 (380) .22 (55)

25B-6(F) 800 (380) .15 (37)

30A-6(F)

30B-6(F) 1000 (470) .30 (75)

31A-6(F) 1000 (470) .20 (50)

31B-6(F) 1000 (470) .16 (40)

36A-6(F) 1200 (565) .30 (75)

36B-6(F) 1200 (565) .21 (52)

38A-6(F) 1200 (565) .30 (75)

38B-6(F) 1200 (565) .21 (52)

36C-6(F) 1200 (565) .21 (52)

42B-6(F) 1400 (660) .28 (70)

43B-6(F) 1400 (660) .24 (60)

43C-6(F) 1400 (660) .16 (40)

44/48C-6(F) 1400 (660) .23 (57)

48B-6(F) 1600 (755) .21 (52)

49C-6(F) 1600 (755) .22 (55)

50/60C-6(F) 1600 (755) .29 (72)

60D-6(F) 2000 (945) .27 (67)

62C-6(F) 2000 (945) .34 (85)

62D-6(F) 2000 (945) .27 (67)

Drop: in. w.g. (Pa)

Dry Wet

.18 (45)

.O8 (2O)

.18 (45)

.16 (40)

.2O (5O)

.16 (40)

.11 (27)

.22 (55)

.18 (45)

.13 (32)

.27 (67)

.17 (42)

.27 (67)

.17 (42)

.22 (55)

.23 (57)

.13 (32)

.18 (45)

.17 (42)

.23 (57)

.21 (52)

.29 (72)

.21 (52)

Xk CAUTION

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.

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.

Alkaline washes are useful for dissolving oxides such as

zinc oxide, aluminum oxide, and iron oxide (rust). These

three oxides are more corrosion-resistant than base

metals, so dissolving or removing them will cause an

increase in corrosion.

CLEANING THE COIL:

1. Remove the coil from the cabinet or plenum, and take

the coil to an appropriate place to clean it.

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 and wait 10 minutes.

NOTE -For units in coastal regions, fresh water will

dissolve away any salt deposits. (Wash coils with fresh

water at least every six months.)

4. 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.

5. Direct the spray so that any debris is washed out of the

coil and basepan. 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 or plenum. Ensure

that you have followed the proper procedure for

routing and securing the refrigerant tubing.

AIMPORTANT

Page 9

C33/CX34 SERIES

LENNOX Evaporator Coils Manual L0806270

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