ICP ENH4X24C17A1, ENH4X24T17A1, ENH4X30C17A1, ENH4X30T17A1, ENH4X31C17A1 Installation Guide

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 7O.
In Canada, refer to the current editions of the Canadian

Electrical Code CSA 022.1.
Recognize safety information. This is the safety-alert

symbol /b,. 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.

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 plugs is required before removing the plugs.

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.

484 01 3700 01 December 2011

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.

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.

Furnace

ctworCo.Ib

Airflow

Airflow

Shipping Brace

Pan Extension

Figure 1 - Model ENH4X Furnace Coil

Furnace

Coil I

o T r)O

Furnace Coil

Airflow

Firer Fra'e _1

Filler Plate -_/! _, o co

Remove

2 Screws

Ductwork

Ductwork

A06031

Ductwork Coil

o o O0

Ductwork Coil

o o ©O

Furnace

i[ ,_ Filler Plate

Filler Plate

Airflow

Airflow

A08065

Figure 2 - Horizontal-Left Installation with Filler Plate

Filler Plate -_

Coil Ductwork

Furnace

Airflow o o co

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:

• 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 wilt 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°C) can harm valve performance. Use a wet cloth or

heat sink when brazing.

2 484 01 3700 01

• 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.

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 Sweatinq
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 Manaqement
With proper installation, these coils wilt 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.

/

Pan Extension

/

Supply Condensate Pan
Plenum

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.

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.

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.

A09084

Figure 5 - Horizontal-Right Installation of Pan

Extension

Installation Confiqurations

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.

484 01 3700 01 3

i

A05419

Figure 6 - Mount Attachment Plates

3. Connect furnace snugly against coil casing.

4. Use self-tapping screws to attach furnace. See
Figure 7.

Drill After Coil _ Self-Tapping Screws

Is Installed\

\b4 _ ,

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.

I.... i

A05420

Figure 7 - Attach Coil to Furnace

5. Seat joint between coil casing and furnace to create
air-tight seat 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 wilt 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.

A05421

Figure 8 - ENH4X Suspension with Plumbers Strap

4 484 01 3700 01

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 Refriqerant 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.

Table 1

MODEL NUMBER Liquid Suction

ENH4X24(C,T)17A 3/8 (1 O) 5/8 (16)
EN H4X30(C,T)I 7A 3/8 (10) 3/4 (19)

ENH4X31 (C,T)I 7A 3/8 (10) 3/4 (19)
ENH4X36(C,T)17A 3/8 (1 O) 3/4 (19)

ENH4X42(C,T)21A 3/8 (1 O) 7/8 (22)
ENH4X43(C,T)21A 3/8 (1 O) 7/8 (22)

ENH4X48(C,T)21A 3/8 (1 O) 7/8 (22)
ENH4X60(C,T)24A 3/8 (10) 7/8 (22)

ENH4X61 (C,T)24A 3/8 (1 O) 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.

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 coot. 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.

COIL CONNECTION TUBE SIZE

inches (mm)

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 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 wilt 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

484 01 3700 01 5