ICP END4X36L17A1 Installation Guide

INSTALLATION INSTRUCTIONS

Cased N Coil, Upflow−Downflow

END4X, ENW4X

NOTE: Read the entire instruction manual before starting the

installation.

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
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.

!

WARNING

ELECTRICAL SHOCK HAZARD

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.

!

CAUTION

PERSONAL INJURY 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 plugs is required before removing the plugs.

on

!

CAUTION

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.

!

CAUTION

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
gloves when handling parts.

!

CAUTION

UNIT OR PROPERTY DAMAGE HAZARD

Failure to follow this caution may result in property
damage.

Take precautions to ensure Aluminum tubes do not
come in direct contact or allow for condensate run
off with a dissimilar metal. Dissimilar metals can
cause galvanic corrosion and possible premature
failure.

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..................................

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.

Specifications subject to change without notice.

484 01 3601 02 8/9/17

INSTALLATION

S water blow−off

When attaching the coil and building the plenum, pay special

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 will briefly discuss those factors.

Airflow

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

S low system performance
S restricted TXV
S frosted coil
S poor humidity control

Table 1

FLUSH FIT TO

MODEL NUMBER TONS

END4X18L14A 1-1/2 14-3/16 (360) 3/8 5/8 12-7/8 (327) N/A N/A N/A
END4X19L17A 1-1/2 17-1/2 (445) 3/8 5/8 16-3/16 (411) No Ye s Yes
END4X24L14A 2 14-3/16 (360) 3/8 5/8 12-7/8 (327) N/A N/A N/A
END4X24L17A 2 17-1/2 (445) 3/8 5/8 16-3/16 (411) No Ye s Yes
END4X30L14A 2-1/2 14-3/16 (360) 3/8 3/4 12-7/8 (327) N/A N/A N/A
END4X30L17A 2-1/2 17-1/2 (445) 3/8 3/4 16-3/16 (411) No Ye s Yes
END4X31L17A 2-1/2 17-1/2 (445) 3/8 3/4 16-3/16 (411) No Ye s Yes
END4X36L17A 3 17-1/2 (445) 3/8 3/4 16-3/16 (411) No Ye s Yes
END4X36L21A 3 21 (533) 3/8 3/4 19-5/8 (498) No Ye s Yes
END4X37L17A 3 17-1/2 (445) 3/8 3/4 16-3/16 (411) Yes No No
END4X42L17A 3-1/2 17-1/2 (445) 3/8 7/8 16-3/16 (411) No Ye s Yes
END4X42L21A 3-1/2 21 (533) 3/8 7/8 19-5/8 (498) No Ye s Yes
END4X43L24A 3-1/2 24-1/2 (622) 3/8 7/8 23-1/8 (587) No Ye s Yes
END4X48L21A 4 21 (533) 3/8 7/8 19-5/8 (498) No Ye s Yes
END4X48L24A 4 24-1/2 (622) 3/8 7/8 23-1/8 (587) No Ye s Yes
END4X60L24A 5 24-1/2 (622) 3/8 7/8 23-1/8 (587) No Ye s Yes
END4X61L24A 5 24-1/2 (622) 3/8 7/8 23-1/8 (587) No Ye s No

ENW4X36L17A 3 17-1/2 (445) 3/8 3/4 16-3/16 (411) Ye s No No
ENW4X42L21A 3-1/2 21 (533) 3/8 7/8 19-5/8 (498) Ye s No No
ENW4X48L21A 4 21 (533) 3/8 7/8 19-5/8 (498) Yes No No
ENW4X60L24A 5 24-1/2 (622) 3/8 7/8 23-1/8 (587) Ye s No No

FURNACE WIDTH

inches (mm)

COIL CONNECTION

Liquid Suction

END4X, ENW4X COIL INFORMATION

TUBE SIZE

inches (mm)

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.)

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.

SHELF WIDTH

(See Figure 1,

Dim. A)

inches (mm)

FITS NEXT SMALLER FURNACE

Equal

Overhang

Overhang with

Tr an si tio n

Offset Left

Select Installation Procedure

!

CAUTION

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 slab 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

19

3

⁄16″

(487)

1

⁄2″

(13)

(27)

3

1

⁄16″

(30)

A

1

1

⁄16″

Field-supplied
Plenum

6″

(152)

Field
Coil
Support Shelf

1

2

⁄4″

(57)

of the coil.

See
Table 1

See Table 1 for dimensions and overhang options. Refer to

Furnace

instructions for placement of coil casing on furnace.

Figure 1 − Correct Orientation of Coil Support on Furnace

2 484 01 3601 02

Specifications subject to change without notice.

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

Supply

Downflow

Evaporator

Upflow
Furnace

Return

Coil

Supply

Figure 2 − Typical Coil Installation

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.

Block-Off
Plates

Figure 3 − Block−Off Plate Removal

ENW4X MODEL COILS APPLIED CENTERED OVER
NARROW FURNACE

Furnace

A05411

A05412

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.

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.

Downflow Cased Coil Installation

1. Place N−coil on supply duct opening.

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

NOTE: In downflow 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 have a
field−fabricated transition between furnace and N−coil
casing as specified in Figure 5.

4. Coils that overhang (wider than furnace) do not require a
transition in downflow application. However, a
field−supplied furnace shelf should be constructed to fit
furnace to coil opening.

484 01 3601 02 3

Specifications subject to change without notice.

5. Place furnace on top of N−coil casing, or field−supplied

ABC

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)

DIMENSIONS Inches (mm)

furnace shelf.

2 1/4” (57)

Field
Fabricated
Block-off
Plate

ALTERNATIVE

A

ENW4X Models Only

MODELS: T036, T042,
T048, AND T060 ONLY

ALTERNATIVE

B

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

S Do not overheat valve. Temperatures that exceed 212_F

(100_C) can harm valve performance. Use a wet cloth or heat
sink when brazing.

S Place liquid filter dryer near ID unit to reduce the risk of debris

clogging the valve.

S 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: All TXV’S have preset superheat settings and are not
field−adjustable.

ALTERNATIVE

C

WRONG

A08337

Figure 4 − Alternative Coil Mounting Positions

Coil Casing Width

B

Rear Bracket

Side Bracket

c

Front Bracket

Side Bracket

19 1/2” (495)

(Outside)

NOTE: Weld 3 places
in 4 corners

3/4” (19)
Flanges
(Where Shown)

A

(Inside Opening)

Furnace Outlet

A09395

Figure 5 − Recommended Transition

4 484 01 3601 02

Specifications subject to change without notice.

Refrigerant Line Connections

!

PERSONAL INJURY HAZARD

Failure to follow this warning could result in personal
injury.

Wear eye protection.

Coil is factory charged with 15 psi nitrogen. The coil is
under pressure and TXV screen is in place behind liquid
line plug. DO NOT remove liquid line plug first, always
remove the suction line plug first to depressurize the coil.

NOTE: Factory nitrogen charge may escape past rubber plugs
during storage. This does not indicate a leaking coil nor warrant
return of the coil.

Size and install refrigerant lines according to information provided
with outdoor unit. Coil connection tube sizes are shown in Table 1.
Route refrigerant lines to the coil in a manner that will not obstruct
service access to the unit or removal of the filter.

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.

WARNING

Connect Refrigerant Liquid and Suction Lines

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

!

CAUTION

UNIT OR PROPERTY DAMAGE HAZARD

Failure to follow this caution may result in property damage.

Take precautions to ensure Aluminum tubes do not come in
direct contact or allow for condensate run off with a dissimilar
metal. Dissimilar metals can cause galvanic corrosion and
possible premature failure.

10 Slide tubing plate with rubber grommets over joints. Position

tubing at center of each grommet to ensure an air seal
around the tube. Reinstall cabinet door.

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.

!

CAUTION

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−sinking
material such as a wet cloth.

!

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in product damage.
DO NOT BURY MORE THAN 36 IN. OF REFRIGERANT

TUBING IN GROUND. If any section of tubing is buried,
there must be a 6 in. vertical rise to the valve connections
on the outdoor unit. If more than the recommended length is
buried, refrigerant may migrate to cooler buried section
during extended periods of unit shutdown, causing
refrigerant slugging and possible compressor damage at
start−up.

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

The coil can be connected to outdoor units using 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.

See Table 1 for coil connection tube size.

1 Remove cabinet access door.
2 Remove rubber plugs, suction plug then liquid plug, from coil

stubs using a pulling and twisting motion. Hold coil stubs
steady to avoid bending or distorting.

3 Remove tubing plate with rubber grommets and slide plate

with grommets onto the refrigerant lines (field line−set), away
from braze joints.

4 Fit refrigerant lines into coil stubs. Wrap a heat sinking

material such as a wet cloth behind braze joints.

5 Wrap TXV and nearby tubing with a heat−sinking material

such as a wet cloth.

6 Use 1/2 psig Nitrogen purge in the suction and out the liquid

line.

7 Braze using a Sil−Fos or Phos−copper alloy. Do not use soft

solder.

8 After brazing, allow joints to cool. Carefully remove TXV bulb

insulation and verify that the TXV bulb is securely fastened
with hose clamp. Tighten screw a half−turn past hand tight
with TXV bulb placed in the indentation with full contact with
the vapor line tube. Re−wrap TXV bulb with insulation.

9 Leak check connections before insulating entire suction line.

!

CAUTION

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). 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.

484 01 3601 02 5

Specifications subject to change without notice.

Figure 7 − Condensate Drain to Waste Line

A10216

3” / 76mm

A08067

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).

!

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.

WARNING

Humidifier Application

When installing a humidifier in a system which contains an
N−coil, consideration must be given to location of coil slabs. See
Figure 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.

Supply

Evaporator
N−Coil

Upflow
Furnace

Figure 8 − Installation of Humidifier in System with N−Coil

Copyright 2017 International Comfort Products

Lewisburg, TN 37091 USA

6 484 01 3601 02

Specifications subject to change without notice.

A05414