Trane 4NXCA024AC3HCA, 4NXCB025AC3HCA, 4NXCA018AC3HCA, 4NXCB032AC3HCA, 4NXCB036AC3HCA Installer's Manual
...
Installer’s Guide
WARNING
!
Cased Aluminum "Convertible" Coils
18-AD28D1-2
4NXCA018AC3HCA
4NXCA024AC3HCA
4NXCB025AC3HCA
4NXCB032AC3HCA
4NXCB036AC3HCA
4NXCD063BC3HCA
4NXCB031AC3HCA
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.
WARNING (Medium/high pressure)
Contains Refrigerant!
System contains oil and refrigerant under high pressure. Recover refrigerant to relieve pressure before
opening the system. See unit nameplate for refrigerant
type. Do not use non-approved refrigerants, refrigerant substitutes, or refrigerant additives.
Failure to follow proper procedures or the use of
non-approved refrigerants, substitutes, or refrigerant additives could result in death, serious injury, or
equipment damage.
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
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 transportation 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.
Figure 1
These coils fit the 17½" and 24½" width furnaces without
any adapters in vertical upflow, downflow, or horizontal application. 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.
A341869P25
Installer’s Guide
CAUTION
!
UPFLOW
FURNACE
CASED
COIL
SCREWS
(BOTH SIDES)
STANDOFFS
(BOTH SIDES)
STANDOFFS (4)
DRILL SCREWS (4)
Remove
and
Discard
Replace
C. RECOMMENDATION
If a coil is part of the total system installation, use the Installer’s Guide packaged with the furnaces, and outdoor sections,
and thermostat for physically installing those components.
D. FURNACE IN UPFLOW POSITION
1. UPFLOW COIL CONVERSION (Model 4NXCD063
only)
a. Remove the factory installed two-piece baffle assembly from the apex of the coil by removing the 5/16”
hex head screws. See Figure 2.
b. Replace only the top baffle using the same screws
previously removed.
c. The (2) outer water diverter baffles and the two
piece factory baffle must be removed and the top baffle
replaced for maximum efficiency.
d. Remove the coil by sliding the coil out of the coil
enclosure.
e. Remove the (2) outer water diverter baffles by
removing the 5/16” hex head screws. See Figure 3.
Coil is pressurized with 10 to 20 psi nitrogen. Remove
the valve core on the pressure tap to release the pressure before un-sweating the tubing caps. If no pressure
is released, check for leaks.
2. UPFLOW GAS FURNACE
a. Turn furnace power OFF and remove the flue pipe if
necessary.
b. Apply gasket material (duct seal field supplied) to
ALL mating surfaces between the furnace and the coil
case.
c. Set the coil case on top of the furnace. Connect the
ductwork to the coil case.
d. Replace the furnace flue pipe if it has been removed
and fasten it securely.
e. Turn the furnace power ON.
3. UPFLOW GAS FURNACE - Add-on Cooling
a. Turn furnace power OFF and remove the flue pipe if
necessary.
b. Disconnect and remove a sufficient portion of the
supply ductwork to provide clearance for the cased coil.
c. Install the cased coil following the Installation In-
struction section D-1 of these instructions.
d. Reconnect the ductwork to the coil case.
e. Replace the furnace flue pipe if it has been removed
and fasten it securely.
f. Turn the furnace power ON.
Figure 2
Figure 3
FOR VERTICAL
INSTALLATIONS:
Standoffs and screws (See Figure 4) are included with
the cased coils for attachment to the furnace. There are
clearance alignment holes near the bottom of the coil wrap-
Drill Screw
per. Drill screws are used to engage the top flanges of the
furnace. The standoff is inserted into the cabinet alignment
hole (See Figure 4). The drill screws are inserted through
the standoffs then screwed into the furnace top flange. The
Standoff
coil is always placed downstream of the furnace airflow. The
above instructions apply if the coil is on top of an upflow
furnace.
Alignment Holes
on both sides.
Figure 4
© Trane 2013 18-AD28D1-2
E. FURNACE IN DOWNFLOW POSITION
Remove
and
Discard
Replace
1. DOWNFLOW COIL CONVERSION
Installer’s Guide
For All Downflow Coils
a. Remove the horizontal drain pan from the coil and
discard.
b. Lay the coil on its back side.
c. Locate the 4" wide gasket material found in a plastic
bag in the document pack.
d. Attach the 4" gasket material to three sides of the
bottom of the drain pan as shown. Make sure to start
by matching up the edge of the gasket material to the
inner edge of the drain pan by the coil fins and working
outwards.
e. The gasket material can be cut or ripped easily so
that it can tailored to fit. The gasket material must
cover the three sides along the entire length of the coil
as shown in Figure 5.
For 4NXCD063 Coil Only
a. Remove the factory installed two-piece baffle assem-
bly from the apex of the coil by removing the 5/16” hex
head screws. See Figure 6.
b. Replace only the top baffle using the same screws
previously removed.
c. Installation of the 1/2” wide gasket behind the front
and back triangular baffles is required for downflow applications.
d. Remove the coil by sliding the coil out of the coil
enclosure.
e. Remove the front shield from the coil.
f. Remove the coil from the drain pan.
g. Remove the front triangular two piece baffle from the
coil (do not disassemble) and apply the 1/2” wide gasket
provided to the inside surface of the front baffle. The
gasket will need to be cut in three pieces; two 31.25"
pieces for the sides and one 17.5" piece for the bottom.
See Figure 7.
h. Remove the back triangular two piece baffle from the
coil (do not disassemble) and apply the 1/2” wide gasket
provided to the inside surface of the back baffle. The
gasket will need to be cut in three pieces; two 31.25"
pieces for the sides and one 17.5" piece for the bottom.
See Figure 7.
Start
here
Figure 5
Attach Downflow
Bottom Gasket
Figure 6
Do not overlap
gasket material at
corners.
1/2" Gasket
Attach to
inside surface
of Triangular
Baffle
Figure 7
Attach Gasket to Inside Surfaces
18-AD28D1-2 3
Installer’s Guide
▲
CAUTION
!
CAUTION
!
Coil is pressurized with 10 to 20 psi nitrogen. Remove
the valve core on the pressure tap to release the pressure before un-sweating the tubing caps. If no pressure
is released, check for leaks.
2. DOWNFLOW GAS FURNACE
When a coil is used with a downflow furnace, a subbase
is not required between the coil case and combustible
flooring.
a. Place the coil case on the furnace supply air ple-
num.
b. Secure the coil case to the plenum.
c. Set the furnace on top of the coil case, making sure
that the back side of the discharge opening is snug up
against the duct flange at the top rear of the coil case.
d. Secure the coil case to the furnace.
3. DOWNFLOW GAS FURNACE -- Add On Cooling
a. Turn the furnace power OFF, remove the flue pipe,
and disconnect the fuel and power lines.
b. Raise the furnace to provide sufficient clearance to
mount the coil case beneath it. Modifications will be
required to the existing return air ductwork to permit
the furnace to be raised.
c. Place the coil case on the furnace supply air plenum.
d. Secure the coil case to the plenum.
e. Set the furnace on top of the coil case, making sure
that the back side of the discharge opening is snug up
against the duct flange at the top rear of the coil case.
f. Reconnect the flue pipe and the fuel and power lines.
g. Turn the furnace power ON.
F. FURNACE IN HORIZONTAL LEFT POSITION
Both the coil and furnace must be fully supported. Do not
attempt to suspend the coil using the brackets.
1. HORIZONTAL LEFT COIL CONVERSION (4NXCD063
Coil Only).
a. For the horizontal left configurations, the (2) outer
water diverter baffles must be removed for maximum
efficiency.
b. Remove the coil by sliding the coil out of the coil
enclosure.
c. Remove the (2) outer water diverter baffles by remov-
ing the 5/16” hex head screws. See Figure 8.
Figure 8
2. HORIZONTAL LEFT (4NXCB025 and 4NXCB031 only)
For horizontal left applications in the 4NXCB025 and the
4NXCB031 coils, the installer must remove the horizontal
drain pan retainer clips prior to installing the splash guard.
a. Remove the two screws holding the two horizontal
drain pan clips. See Figure 9.
b. Discard screws and clips.
Figure 9
4 18-AD28D1-2
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