ICP ENA4X18C14A1, ENA4X18C14A2, ENA4X18T14A1, ENA4X18T14A2, ENA4X19C17A1 Installation Guide

NOTE: Read the entire instruction manual before starting
the installation.

TABLE OF CONTENTS

PAGE

SAFETY CONSIDERATIONS ........................ 1

INTRODUCTION ................................... 2

INSTALLATION .................................... 2

Airflow ........................................... 2

TXV ............................................. 2

Inspect Equipment ................................ 2

Select Installation Procedure ....................... 2

Installation of Furnace Coils ........................ 3

Connect Refrigerant Piping ......................... 5

Connect Refrigerant Liquid and Suction Lines ......... 5

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

Condensate Drain Line Connection .................. 5

Waste Line Connection ............................ 6

Humidifier Application .............................. 6

Model Number Identification ........................ 7

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical

shock, or other conditions which may cause death, personal
injury or property damage. Consult a qualified installer,

service agency, or your distributor or branch for information
or assistance. The qualified installer or agency must use

factory-authorized kits or accessories when modifying this
product. Refer to the individual instructions packaged with

the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective

clothing, and work gloves. Use quenching cloth for brazing
operations. Have fire extinguisher available. Read these

instructions thoroughly and follow all warning or cautions
included in literature and attached to the unit. Consult local

building codes and the current editions of the National
Electrical Code (NEC) NFPA 70.

In Canada, refer to the current editions of the Canadian
Electrical Code CSA C22.1.

Recognize safety information. When you see this symbol

Z_ on the unit and in instructions or manuals, be alert to the

potential for personal injury. Understand the signal words
DANGER, WARNING, CAUTION, and NOTE. These words

are used with the safety-alert symbol. DANGER identifies
the most serious hazards which will result in severe

personal injury or death. WARNING signifies hazards which
could result in personal injury or death. CAUTION is used

to identify unsafe practices which may result in minor
personal injury or product and property damage. NOTE is

used to highlight suggestions which will result in enhanced
installation, reliability, or operation.

IMPORTANT: Nitrogen can leak out through the hole that
the needle pierced in the plugs. This does not indicate a
leaking coil nor warrant return of the coil.

ELECTRICALSHOCKHAZARD
Failure to follow this warning could result in personal

injury or death.
Before installing, modifying or servicing system, always

turn off main power to system. There may be more than

one disconnect switch. Lock out and tag switch with a
suitable warning label.

PERSONALINJURY HAZARD
Failure to follow this caution may result in personal

injury.
This coil contains Nitrogen precharge of 15 PSIG.

Release of this pressure through the center of the
rubber lu _beforeremovin the tu s.

ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental

pollution.
Remove and recycle all components or materials (i.e.

oil, refrigerant, etc.) before unit final disposal.

CUT HAZARD
Failure to follow this caution may result in personal

injury.
Sheet metal parts may have sharp edges or burrs. Use

care and wear appropriate protective clothing and

loves when handlin arts.

484 01 3600 00 April 2010

iNTRODUCTiON

Use this instruction manual to install indoor coils on upflow
or downflow furnaces. Do not install coil in horizontal

position. Coils are enclosed in a painted casing have
factory-installed TXV's. These coils are used with R-410A

refrigerant systems.

INSTALLATION

These units can be installed in multiple configurations.
Before installation, there are several performance

requirements that must be considered because poor
installation can negatively alter performance. This section

wilt briefly discuss those factors.

Airflow

Airflow amount and distribution are vital to adequate system
performance. Problems that can be experienced with

incorrect airflow include:

• low system performance

• restricted TXV
frosted coil

poor humidity control
water blow-off

When attaching the coil and building the plenum, pay
special attention to the effect these details will have on

airflow. After system start-up, check the cfm to insure that it
is correct. (Generally, the cfm should be 350 to 400 cfm/ton

during normal cooling operation.)

TXV

A thermal expansion valve is utilized in this coil design to
optimize performance and comfort throughout the entire

operating range of the system. Special attention needs to be
taken to the TXV when installing the coil

Do not overheat valve. Temperatures that exceed 212°F

(100_}0) can harm valve performance. Use a wet cloth or

heat sink when brazing.
Place liquid filter dryer near ID unit to reduce the risk of

debris clogging the valve.
Make sure TXV bulb is securely fastened and wrapped in
the indentation on vapor line tube.

END4X, ENW4X coils have a factory-installed hard-shutoff
TXV designed only for use with R-410A refrigerant. Use

only with outdoor units designed for R-410A.
NOTE: AIt TXV'S have preset superheat settings and are

not field-adjustable.

Cabinet Sweating

if this unit is installed in a garage, attic, or other
unconditioned space, special attention needs to be given to

the potential of cabinet sweating. A 6-in (152 mm) wide
piece of insulation should be wrapped around the coil

casing and supply duct connection point.

Inspect Equipment

File claim with shipper if equipment is damaged.

NOTE: Models with tin-plated copper coils, "T" in the 8th
position of the model number, are

standard copper coils.

installed the same as

Select Installation Procedure

PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property

damage.
installing coils rotated 90 ° from the front of the furnace,

in upflow or downflow applications, may cause water
blow-off or coil freeze-up due to the concentration of air

on one slab of the coil or lack of air to a stab in the coil.
it is recommended that on this type of application, a

field-supplied adapter be placed between the coil and
furnace to allow air to distribute properly between all

slabs of the coil.

NOTE: Furnace coils are not approved to be used in fan
coil or "draw-through" type applications.

To install cased coils in upflow applications, follow the

instructions below, Upflow Cased Coil Installation.

To install cased coils in downflow applications, follow the

instructions below, Downflow Cased Coil installation.
See Table 1 for dimensions and overhang options. Refer to

instructions for placement of coil casing on furnace.

2 484 01 3600 00

Table 1

MODEL NUMBER TONS

END4X18(C,T) 14A 1 - 1/2 14-3/16 (360)
END4X19(C,T)17A 1-1/2 17-1/2 (445)

END4X24(C,T)14A 2 14-3/16 (360)
END4X24(C,T)17A 2 17-1/2 (445)

END4X30(C,T) 14A 2-1/2 14-3/16 (360)
END4X30(C,T)17A 2-1/2 17-1/2 (445)

END4X31(C,T)17A 2-1/2 17-1/2 (445)
END4X36(C,T)17A 3 17-1/2 (445)

END4X36(C,T)21A 3 21 (533)
END4X37(C,T)17A 3 17-1/2 (445)

END4X42(C,T)17A 3-1/2 17-1/2 (445)
END4X42(C,T)21A 3-1/2 21 (533)

END4X43(C,T)24A 3-1/2 24-1/2 (622)
END4X48(C,T)21A 4 21 (533)

END4X48(C,T)24A 4 24-1/2 (622)
END4X60(C,T)24A 5 24-1/2 (622)

END4X61 (C,T)24A 5 24-1/2 (622)
ENW4X36 (C,T) 17A 3 17-1/2 (445)

ENW4X42(C,T)21A 3-1/2 21 (533)
ENW4X48(C,T)21A 4 21 (533)

ENW4X60(C,T)24A 5 24-1/2 (622)

NOTES:

For the model number; C = standard copper and T= tin plated copper

FLUSH FIT TO

FURNACE WIDTH

inches (ram)

COIL CONNECTION SHELF WIDTH FITS NEXT SMALLER FURNACE

Liquid Suction

3/8 5/8
3/8 5/8

3/8 5/8
3/8 5/8

3/8 3/4
3/8 3/4

3/8 3/4
3/8 3/4

3/8 3/4
3/8 3/4

3/8 7/8
3/8 7/8

3/8 7/8
3/8 7/8

3/8 7/8
3/8 7/8

3/8 7/8
3/8 3/4

3/8 7/8
3/8 7/8

3/8 7/8

END4X, ENW4X COiL INFORMATION

TUBE SIZE

inches (ram)

(See Figure 1,

Dim. A)

inches (ram)

12-7/8 (327)

16-3/16 (411)

12-7/8 (327)

16-3/16 (411)

12-7/8 (327)

16-3/16 (411)
16-3/16 (411)

16-3/16 (411)

19-5/8 (498)

16-3/16 (411)
16-3/16 (411)

19-5/8 (498)

23-1/8 (587)

19-5/8 (498)
23-1/8 (587)
23-1/8 (587)

23-1/8 (587)

16-3/16 (411)

19-5/8 (498)

19-5/8 (498)
23-1/8 (587)

Overhang

Equal

N/A

No

N/A

No

N/A

No
No

No
No

Yes

No
No

No
No

No
No

No

Yes
Yes

Yes
Yes

Overhang with

Transition

N/A
Yes

N/A
Yes

N/A
Yes

Yes
Yes

Yes

No

Yes
Yes

Yes
Yes

Yes
Yes

Yes

No
No

No
No

Offset Left

N/A
Yes

N/A
Yes

N/A
Yes

Yes
Yes

Yes

No

Yes
Yes

Yes
Yes

Yes
Yes

No
No

No
No

No

Field-supplied
Plenum

193/16"

Coil
Support Shelf

(152)

Table 1

Figure 1 - Correct Orientation of Coil Support on Furnace

L Furnace

(57)

A08336

Installation of Furnace Coils

Upflow Cased Coil installation
NOTE: On upflow installations where the indoor coil is

placed in an unconditioned space, a 6 inch (152 mm) wide
piece of insulation should be applied and wrapped around
the outside of coil casing and supply duct contact point.

1. Set coil in place on upflow furnace discharge air
opening. See Figure 2.

2. When coil front width matches furnace front width, the
coil can be placed directly on furnace.

3. Ensure coil is level for proper condensate drainage.
Do not tip coil toward condensate drain. Coil

enclosure need not be fastened or screwed to

furnace.

Return

Upflow
Furnace

\

Evaporator
Coil

Downflow

Furnace

\

Supply

A05411

Figure 2 - Typical Coil Installation

484 01 3600 O0 3

NOTE: When ENW4X coils are applied to same width
furnace, remove block-off plates at casing base by
removing 2 screws per plate from side of casing. See
Figure 3.

3. Prepare and install block-off plate. See Figure 4,

Alternative C. Using field-supplied sheet metal, cut a

block-off plate to be attached to bottom left side of
coil casing. This plate prevents air leakage from

overhanging portion of coil. Attach plate using sheet
metal screws.

4. Continue with normal installation practices. See
Connect Refrigerant Piping.

Block-Off

A05412

Figure 3 - Block-Off Plate Removal

ENW4X MODEL COILS APPLIED CENTERED OVER
NARROW FURNACE

1. There is no transition required for this application.

2. Remove coil from packaging and place on top of
furnace with 1 5/8 inch (41 mm) overhang on both
sides. See Figure 4, Alternative A.

3. Continue with normal installation practices. See
Connect Refrigerant Piping.

STANDARD MODEL COILS APPLIED CENTERED OVER
NARROW FURNACE REQUIRE A MINIMUM TRANSITION
AS SPECIFIED IN Figure 5.

1. Prepare transition, following recommended transition
drawing. See Figure 5.

2. Place transition on top of gas furnace. See Figure 4,
Alternative B. Secure with sheet metal screws. Place

coil on top of transition. Make sure coil rests evenly
on top of transition and gas furnace.

3. Secure coil to transition using sheet metal screws.

4. Continue with normal installation practices. See
Connect Refrigerant Piping.

NOTE: If coil is not being installed in the standard
orientation (front of coil matching front of furnace) then coil
must be raised above furnace as specified in Figure 5.

STANDARD MODEL COILS APPLIED DIRECTLY ON TOP
AND OFFSET TO THE LEFT ON NARROW FURNACE

1. Notch support rail on underside of coil cabinet to
provide clearances for gas furnace flange. This rail is

not visible from front of coil. To locate position of
notch, place coil directly on top of gas furnace with

overhanging portion entirely on left side as in
Figure 4, Alternative C. Mark location of gas furnace

flange on coil casing. Remove coil from top of
furnace. Using tin snips, make a notch in rail large

enough to allow clearance for gas flow furnace flange.

2. Place coil on top of gas furnace. Make sure coil is
shifted completely to left side, and notch is sufficient
so coil rests on top of furnace cabinet.

__ 2 1/4" (57)

! __

l

ENW4X Models Only

Field J
Fabricated

Block-off
Plate

Downflow Cased Coil Installation

1. Place N-coil on supply duct opening.

2. When coil width matches furnace width, furnace can

NOTE: In downftow installation with a 4-way multipoise

furnace, break off perforated duct flanges on furnace. See

Furnace Installation Instructions.

3. Coils that under-hang (narrower than furnace) must

4. Coils that overhang (wider than furnace) do not

5. Place furnace on top of N-coil casing, or

l

ALTERNATIVE

C

Figure 4 - Alternative Coil Mounting Positions

be placed directly on the cased coil.

have a field-fabricated transition between furnace
and N-coil casing as specified in Figure 5.

require a transition in downflow application. However,
a field-supplied furnace shelf should be constructed

to fit furnace to coil opening.

field-supplied furnace shelf.

l

ALTERNATIVE

B

A08337

4 484 01 3600 00

Coil Casing Width

B

C

Front Bracket

A

(InsideOpening)

Furnace Outlet

Figure 5 - Recommended Transition

Connect Refrigerant Piping

Use accessory tubing package or field-supplied tubing of
refrigerant grade. Suction tube must be insulated. Do not

use damaged, dirty, or contaminated tubing because it may
plug refrigerant flow-control device. ALWAYS evacuate the

coil and field-supplied tubing before opening outdoor unit
service valves.

Connect Refrigerant Liquid and Suction
Lines

For matched and mismatched systems, use line sizes
recommended in outdoor unit Installation Instructions.

The coil can be connected to outdoor units using accessory
tubing packages or field-supplied tubing of refrigerant
grade. Always evacuate tubing and reclaim refrigerant when

making connections or flaring tubing. Leak check
connections before insulating entire suction line.

Suction Line

Suction line is designed for field sweat connection. Line is
plugged to keep out moisture and dirt. Remove these plugs

only when ready to make connection.
See Table 1 for coil connection tube size.

UNiT DAMAGE HAZARD
Failure to follow this caution may result in product

damage.

To avoid valve damage to the refrigerant control device

while brazing, valves must be wrapped with a
heat_ial such as a wet cloth.

1. Remove cabinet access door.

2. Remove rubber plugs from coil stubs using a pulling
and twisting motion. Hold coil stubs steady to avoid

bending or distorting.

3. Wrap TXV and nearby tubing with a heat sinking
material such as a wet cloth.

4. Use 1/2 psig Nitrogen purge in the suction and out the
liquid line.

5. Braze using a Sil-Fos or Phos-copper alloy. Do not
use soft solder.

Rear Bracket

NOTE: Weld 3 places

19 1/2" (495)

(Outside)

DIMENSIONS Inches (mm)

A B C

12-3/4 (324) 17-1/2 (445) 2-1/4 (57)
16-1/16 (408) 21 (533) 2-1/4 (57)
19-9/16 (497) 24-1/2 (622) 2-1/4 (57)

17-5/8 (448) 19-3/8 (492) 4 (102)

21-1/4 (540) 23 (584) 4 (102)

23 (584) 24-1/2 (622) 4 (102)

in 4 corners

3/4" (19)
Flanges

(Where Shown)

A09395

6. After brazing, allow joints to coot. Slide rubber
grommets over joints. Position tubing at center of
each grommet to ensure an air seat around the tube.

7. Always evacuate lines and reclaim refrigerant when
making connections or flaring refrigerant lines. Leak

check connections before insulating entire suction line.

8. If outdoor equipment will not be installed until a later
date, braze liquid and suction lines closed outside. Add

a Schraeder port test fitting to the suction line outside.

Refrigerant Metering Device
END4X, ENW4X coils have a factory-installed hard shut-off

TXV designed only for use with R-410A refrigerant. Use

only with outdoor units designed for R-410A.
NOTE: ALL TXV'S HAVE PRESET SUPERHEAT

SETTINGS AND ARE NOT FIELD-ADJUSTABLE.

Condensate Drain Line Connection

PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property

damage.
When installing over a finished ceiling and/or living area,

install a field-fabricated secondary condensate pan
under the entire unit.

The coil is designed to dispose of accumulated water
through built-in condensate drain fittings. It is recommended

that PVC fittings be used on the condensate pan. Do not

over-tighten. Finger tighten plus 1-1/2 turns. Be sure to
install plastic plug in unused condensate drain fitting. Two

3/4 inch female threaded pipe connections are provided in

each coil condensate pan.

A trap is not necessary on the condensate line. Consult

local codes for additional restrictions or precautions. If local
codes require a trap then the following guidelines are

suggested to assure proper drainage. Install a trap in

condensate line of coil as close to the coil as possible. Make

trap at least 3 inches (76 mm) deep and no higher than the

bottom of unit condensate drain opening (See Figure 6).

484 01 3600 00 5

Pitch condensate line 1 inch (25.4 mm) for every 10 ft. of
length to an open drain or sump. Make sure that the outlet

of each trap is below its connection to condensate pan to
prevent condensate from overflowing the drain pan. Prime

all traps, test for leaks, and insulate traps and lines if located
above a living area.

A08067X

Figure 6 - Condensate Trap

NOTE: If unit is located in or above a living space, where

damage may result from condensate overflow, a
field-supplied, external condensate pan should be installed
underneath the entire unit, and a secondary condensate line
(with appropriate trap) should be run from the unit into the

pan. Any condensate in this external condensate pan
should be drained to a noticeable place. As an alternative to

using an external condensate pan, some localities may
allow the running of a separate 3/4 inch (19 mm)

condensate line (with appropriate trap) per local code to a
place where the condensate will be noticeable. The owner

of the structure must be informed that when condensate
flows from secondary drain or external condensate pan, the

unit requires servicing or water damage will occur. To further
protect against water damage, install a float switch to shut
the unit off if the water in the secondary pan gets too high.

NOTE: To avoid drainage problems, test the primary drain
line by slowly pouring water into the pan. Check piping for
leaks and proper condensate drainage. Using the
secondary drain as explained in the previous note provides
further protection against overflow due to a clogged primary

drain.
NOTE: In applications where return air humidity levels stay

at 70% or above for a prolonged period of time,
condensation can form on the bottom of pan and drip.

WASTE LINE CONNECTION

If the condensate line is to be connected to a waste (sewer)
line, an open trap must be installed ahead of the waste line

to prevent escape of sewer gases (See Figure 7).

Air Gap Above

aid Level

EXPLOSION HAZARD
Failure to follow this warning could result in personal

injury or death.
Provide trap with air gap in drain line when connecting

to waste (sewer) line.

Humidifier Application

When installing a humidifier in a system which contains an

N-coil, consideration must be given to location of coil slabs.
See Fig. 8.

1. The humidifier should be mounted to the supply
plenum or return duct whenever possible. If

necessary, humidifiers can be mounted to the left side
of coil casing. The right side of the coil casing must

not be used to mount the humidifier.

2. Care must be taken to prevent damage of N-coil
when attaching humidifier to coil casing or plenum.

3. Ensure that humidifier has adequate airflow.

Evaporator
N-Coil

Upflow
Furnace

A05414

Figure 8 - Installation of Humidifier in System with

N=Coil

Condensate

Line

Trap I Sewer Line I

A102t6

Figure 7 - Condensate Drain to Waste Line

6 484 01 3600 00

Digit Position

E = Evaporator
B = Builder

D = Standard
N = N Coil

A = Uncased

D = Cased Upflow/Downflow
M = Cased Multiposition (Upflow/Downflow/Horizontal)

W = Cased Upflow/Downflow for narrower furnaces

H = Cased Horizontal INSTALLATION

4 = Environmentally Sound R-410A REFRIGERANT
P = Piston

X = TXV METERING DEVICE
18 = 18,000 BTUH = 11/2tons

19 = 18,000 BTUH = 11/2tons
24 = 24,000 BTUH = 2 tons

30 = 30,000 BTUH = 21/2tons
31 = 30,000 BTUH = 21/2tons
36 = 36,000 BTUH = 3 tons

37 = 36,000 BTUH = 3 tons
42 = 42,000 BTUH = 31/2tons
43 = 42,000 BTUH = 31/2tons

48 = 48,000 BTUH = 4 tons
60 = 60,000 BTUH = 5 tons

61 = 60,000 BTUH = 5 tons NOMINAL CAPACITY
C = Plain Copper

L = Aluminum

T = Tin Coated Copper

14 = 14.5"
17 = 17.5"

21 = 21"
24 = 24.5"

BB = 15.5"
FF = 19.1"
JJ = 22.8"

LL = 24.5"
Sales Digit (Major Revision)

Engineering Digit (Minor Revision)

1 2 3

E N D

TYPE

4 5 6,7
4 X 18

HAIRPIN MATERIAL

8 9,10

C 14

WIDTH

11

A

ii

12

1

484 01 3600 00 7

International Comfort Products, LLC

Lewisburg, TN 37091 USA