International comfort products ENH4X User manual

484 01 3700 01 December 2011
INSTALL
A
TION INSTRUCTIONS
Cased N Coil, Horizontal
ENH4X
NOTE: Read the entire instruction manual before starting
the installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 1........................
INTRODUCTION 2...................................
INSTALLATION 2....................................
Horizontal Right and Left with Pan Extension 3......
Furnace Attachment 3............................
Horizontal Attic 4................................
Horizontal Crawl Space 4.........................
Refrigerant Lines 4..............................
Connect Refrigerant Liquid and Suction Lines 4......
Connect Condensate Drain Line 5.................
Waste Line Connection 5.........................
Model Number Identification 6.....................
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 cloths for brazing
operations. Have fire extinguisher available. Read these
instructions thoroughly and follow all warnings or cautions
attached to the unit. Consult local building codes and the
current editions of the National Electrical Codes (NEC)
NFPA 70.
In Canada, refer to the current editions of the Canadian
Electrical Code CSA C22.1.
Recognize safety information. This is the safety--alert
symbol . When you see this symbol on the unit and in
instructions or manuals, be alert to the potential for personal
injury.
Understand the signal words DANGER,WARNING and
CAUTION. 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.
NOTE: Nitrogen can leak out through the needle pierce
hole in the plugs. This does not indicate a leaking coil nor
warrant return of the coil.
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.
!WARNING
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.
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
!

2484 01 3700 01
INTRODUCTION
The ENH4X is a horizontal, multi--use furnace coil (see
Figure 1). With the use of field--supplied transition duct,
these furnace coils can also be applied to other similar
horizontal furnaces on the market. The ENH4X is available
in sizes 24 through 60. All models are equipped with a
factory--installed TXV and are used with R--410A refrigerant
systems.
NOTE: Models with tin--plated copper coils, “T” in the 8th
position of the model number, are installed the same as
standard copper coils.
Shipping Brace
Remove
2 Screws
Pan Extension
A06031
Figure 1 -- Model ENH4X Furnace Coil
INSTALLATION
This coil is not designed to be installed with furnaces that
measure wider than the coil itself.
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.
Coil Furnace
Ductwork
Airflow
CoilDuctwork Furnace
Filler Plate
Filler Plate
Airflow
Furnace
Coil
Ductwork
Airflow
Filler Plate
A08065
Figure 2 -- Horizontal--Left Installation with Filler Plate
Coil Ductwork
Airflow
Furnace
Furnace
Coil Ductwork
Airflow
Filler Plate
Coil Ductwork
Airflow
Furnace
Filler Plate
Filler Plate
A08066
Figure 3 -- Horizontal--Right Installation with Filler Plate
Airflow
Airflow amount and distribution are vital to adequate system
performance. In addition, heat pump applications require
airflow in a particular direction for best performance. See
decal on front of coil for correct direction. Problems that can
be experienced with incorrect airflow include:
Slow system performance
Srestricted TXV
Sfrosted coil
Spoor humidity control
Swater 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
SDo not overheat valve. Temperatures that exceed 212_F
(100_C) can harm valve performance. Use a wet cloth or
heat sink when brazing.

484 01 3700 01 3
SPlace liquid filter dryer near ID unit to reduce the risk of
debris clogging the valve.
SMake sure TXV bulb is securely fastened and wrapped in
the indentation on vapor line tube.
ENH4X Models:
These 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.
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 inch (152 mm) wide
piece of insulation should be wrapped around the coil
casing and supply duct connection point.
Condensate Management
With proper installation, these coils will manage the
condensate without blow--off into the duct work. The 60 size
coil requires the addition of a pan extension for both horizontal
left and horizontal right position, which is supplied with the
coils. See detailed instructions for more info. Also, refer to
Connect Condensate Drain Line section of this instruction.
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.
CAUTION
!
HORIZONTAL--RIGHT AND
HORIZONTAL--LEFT WITH PAN EXTENSION
(5 Ton Size Only)
1. There are two separate pan extensions shipped with
the unit. For horizontal left installations, use the pan
attached to the left shipping bracket. For horizontal
right installations, use the pan attached to the right
shipping bracket. Be sure to use the correct pan
extension for the application. There should not be any
gaps between the plastic condensate pan and the
pan extension. All condensate should flow from the
pan extension to the plastic condensate pan and not
leak into the coil cabinet or duct.
NOTE: Discard the pan not used along with both shipping
brackets.
2. For horizontal--left installation, install pan extension
onto left end of horizontal--condensate pan. Pan
extension is slotted to fit onto condensate pan edge
and will extend into supply plenum. See Figure 4.
Supply
Plenum Condensate Pan
Pan Extension
A06032
Figure 4 -- Horizontal--Left Installation of Pan Extension
3. For horizontal--right installation, install pan extension
onto right end of horizontal--condensate pan. Pan
extension is slotted to fit onto condensate pan edge
and will extend into supply plenum. See Figure 5.
A09084
Figure 5 -- Horizontal--Right Installation of Pan
Extension
Installation Configurations
These units can be installed on a work platform, secured to
roof trusses in the attic, suspended from hangers on floor
joists in the crawl space, or installed on blocks. See proper
section and figures for detailed installation instructions.
NOTE: Pan extension is needed for both horizontal left and
right applications. DO NOT DISCARD.
FURNACE ATTACHMENT
Attach coil to furnace
The attachment plates (3) and filler plate (1) are packaged
together and placed in the coil carton. Remove these items,
verifying the number of pieces. Use the following procedure
to attach ENH4X horizontal coil to furnace.
NOTE: Remove shipping brace from both ends of casing
prior to installation. Also remove corrugated shipping block
from inside the right end of casing prior to installation.
1. Three attachment plates are used to attach coil to
furnace. Application determines which end of the coil
will be attached to the furnace.
2. Use self--tapping screws to mount attachment plates
to coil casing. See Figure 6.

4484 01 3700 01
A05419
Figure 6 -- Mount Attachment Plates
3. Connect furnace snugly against coil casing.
4. Use self--tapping screws to attach furnace. See
Figure 7.
Self-Tapping Screws
Drill After Coil
Is Installed
A05420
Figure 7 -- Attach Coil to Furnace
5. Seal joint between coil casing and furnace to create
air--tight seal using locally--approved materials.
NOTE: If the coil and furnace are different widths, refer to
Figure 2 and Figure 3.
HORIZONTAL ATTIC INSTALLATION
Construct work platform to support coil/furnace
combination
1. Construct work platform, using material in platform
that will support the weight of an installer or a service
person.
2. Place work platform in front of discharge end of
furnace.
3. Secure platform to building joists.
Install coil
To suspend ENH4X:
1. Cut metal plumbers strap to desired lengths.
2. Attach metal plumbers strap to four corners of coil
casing (see Figure 8).
3. Use a minimum of two screws per corner to attach
plumbers strap to casing.
4. Position and secure coil in front of furnace discharge
end.
5. Make sure coil is level for proper condensate
drainage.
6. Using appropriate fasteners for duct type, connect
supply--air duct to coil.
HORIZONTAL CRAWL SPACE INSTALLATION
As an alternate to horizontal attic installation, the ENH4X
horizontal coil can be installed in a crawl space by mounting
on suitable blocks, pads or by hanging from floor joists.
To suspend ENH4X:
1. Cut metal plumbers strap to desired lengths.
2. Attach metal plumbers strap to four corners of coil
casing. See Figure 8.
3. Use a minimum of two screws per corner to attach
metal plumbers strap to casing.
4. Position and secure coil in front of furnace discharge
end.
5. Make sure coil is level for proper condensate drainage.
6. Using appropriate fasteners from duct type, connect
supply--air duct to coil.
2 Screws for
Attachment
to Casing
Plumbers
Strap
A05421
Figure 8 -- ENH4X Suspension with Plumbers Strap

484 01 3700 01 5
REFRIGERANT LINES
Refrigerant lines must be configured per local building
codes and the guidelines outlined in the OD units
installation instructions.
NOTE: The filter dryer should be placed just before the
indoor unit.
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
refrigerant line sets or field--supplied lines of refrigerant
grade.
See Table 1 for coil connection tube size.
Ta b le 1 COIL CONNECTION TUBE SIZE
inches (mm)
MODEL NUMBER Liquid Suction
ENH4X24(C,T)17A 3/8 (10) 5/8 (16)
ENH4X30(C,T)17A 3/8 (10) 3/4 (19)
ENH4X31(C,T)17A 3/8 (10) 3/4 (19)
ENH4X36(C,T)17A 3/8 (10) 3/4 (19)
ENH4X42(C,T)21A 3/8 (10) 7/8 (22)
ENH4X43(C,T)21A 3/8 (10) 7/8 (22)
ENH4X48(C,T)21A 3/8 (10) 7/8 (22)
ENH4X60(C,T)24A 3/8 (10) 7/8 (22)
ENH4X61(C,T)24A 3/8 (10) 7/8 (22)
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
!
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. Fit refrigerant lines into coil stubs. Wrap a heat sinking
material such as a wet cloth behind braze joints.
5. Use 1/2 psig Nitrogen purge in the suction and out the
liquid line.
6. Braze using a Sil--Fos or Phos--copper alloy. Do not use
soft solder.
7. After brazing, allow joints to cool. Slide rubber grommets
over joints. Position tubing at center of each grommet to
ensure an air seal around the tube.
8. Always evacuate lines and reclaim refrigerant when
making connections or flaring refrigerant lines. Leak
check connections before insulating entire suction line.
9. 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.
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.
CAUTION
!
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 9).
Pitch condensate line 1 inch (25.4 mm) for every 10 feet
(3m) 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.
3” / 76mm
A08067
Figure 9 -- 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

6484 01 3700 01
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 Fig. 10 ).
A10216
Figure 10 -- Condensate Drain to Waste Line
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

484 01 3700 01 7
COIL MODEL NUMBER IDENTIFICATION GUIDE
Digit Position 123456,7 89,10 11 12
E N H 4 X 18 C14 A 1
E = Evaporator
B = Builder
D = Standard
N=NCoil TYPE
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 = 1½tons
19 = 18,000 BTUH = 1½tons
24 = 24,000 BTUH = 2 tons
30 = 30,000 BTUH = 2½tons
31 = 30,000 BTUH = 2½tons
36 = 36,000 BTUH = 3 tons
37 = 36,000 BTUH = 3 tons
42 = 42,000 BTUH = 3½tons
43 = 42,000 BTUH = 3½tons
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 HAIRPIN MATERIAL
14 = 14--3/16”
17 = 17--1/2”
21 = 21”
24 = 24--1/2”
BB = 15--1/2”
FF = 19.1”
JJ = 22.8”
LL = 24--1/2” WIDTH
Sales Digit (Major Revision)
Engineering Digit (Minor Revision)
International Comfort Products, LLC
Lewisburg, TN 37091 USA