International Comfort Products ENH4X Installation Manual

INSTALLATION 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

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.

. When you see this symbol on the unit and in

!

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.

!

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.

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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.

Ductwork

Coil

Furnace

Airflow

Airflow

Shipping Brace

Pan Extension

Figure 1 -- Model ENH4X Furnace Coil

Furnace

Filler Plate

Furnace

Airflow

Filler Plate

Coil

Coil

Remove
2 Screws

Ductwork

Ductwork

A06031

Filler Plate

Ductwork

CoilDuctwork

Coil

Furnace

Airflow

Filler Plate

Furnace

Airflow

Filler Plate

A08065

Figure 2 -- Horizontal--Left Installation with Filler Plate

Filler Plate

Furnace

Coil

Airflow

Ductwork

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:

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

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.

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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.
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.

!

CAUTION

Pan Extension

Supply
Plenum

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.

Condensate Pan

A06032

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 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.

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