Installer’s Guide
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES
IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service informa-
tion pack upon completion of work.
4NXCA018AC3HCA
4NXCA024AC3HCA
4NXCB025AC3HCA
4NXCB031AC3HCA
WARNING
!
WARNING (Medium/high pressure)
Contains Refrigerant!
System contains oil and refrigerant under high pres-
sure. Recover refrigerant to relieve pressure before
opening the system. See unit nameplate for refrigerant
type. Do not use non-approved refrigerants, refriger-
ant substitutes, or refrigerant additives.
Failure to follow proper procedures or the use of
non-approved refrigerants, substitutes, or refriger-
ant additives could result in death, serious injury, or
equipment damage.
NOTE:
The 4NXCB025AC3HCA and the 4NXCB031AC3HCA coils
are not direct replacements for previously installed 4TXC
coils. There is a height difference in the two coils models
between the two coil families.
A. GENERAL
These coils are designed for use in combination with a heat
pump or cooling outdoor section using
R-410A REFRIGER-
ANT
. These coils may be converted for use with a horizontal
furnace as well.
The 4NXC equipment has been evaluated in accordance with
the Code of Federal Regulations, Chapter XX, Part 3280 or the
equivalent. “Suitable for Mobile Home use” The height of the
Furnace, Coil and discharge duct work must be 7 ft. or less.
Inspect the coil for shipping damaged. Notify the transporta-
tion company immediately if the coil is damaged.
B. APPLICATION INFORMATION
1. FURNACE AND COIL
The coil MUST BE installed downstream (in the outlet air)
of the furnace. The coil apex can face into or away from the
direction of the airflow, depending on horizontal left or right
application.
A341869P25
These coils fit the 17½" and 24½" width furnaces without
any adapters in vertical upflow, downflow, or horizontal ap-
plication.
Some coils require model specific changes
to the coil. See application specific sections.
2. INDOOR UNIT AIRFLOW
Indoor unit must provide the required airflow for the heat
pump or cooling combinations approved for these coils.
IMPORTANT: Review your installation requirements. Check
the table on the outline drawings and note all dimensions
for your coil before beginning the installation.
Table of Contents
General ............................................................................... 1
Application Information ................................................ 1
Recommendation ............................................................. 1
Furnace in Upflow Position .......................................... 2
Furnace in Downflow Position ..................................... 3
Furnace in Horizontal Left Position ........................... 4
Furnace in Horizontal Right Position ........................ 6
Maximum Airflow Setting, CFM ................................... 7
Installing Refrigerant Lines ......................................... 7
Field Fabricated Interconnecting Lines .................... 7
Brazing to Evaporator .................................................... 7
Leak Check........................................................................ 8
Condensate Drain Piping .............................................. 8
Cleaning the Coil ............................................................. 8
Outline Drawings ............................................................ 9
Replacing TXC***S3 Coil with NXC***C3 Coil ........11
TXV Change Out .............................................................11
Figure 1
18-AD28D1-2
Cased Aluminum "Convertible" Coils
4NXCB032AC3HCA
4NXCB036AC3HCA
4NXCD063BC3HCA
