Trane 4PXFH001AC3HHA Assembly instructions

A. GENERAL

These coils are designed for use as cooling only or in

combination with a Heat Pump outdoor section.

B. APPLICATION INFORMATION

1. FURNACE AND COIL

Coil MUST BE installed downstream (discharge air)

of the furnace.

2. INDOOR UNIT AIRFLOW

Indoor unit must provide the required airow for

Cooling only or Heat Pump System Combination.

INSPECTION

Check carefully for any shipping damage. This must be

reported to and claims made against the transportation

company immediately. Check to be sure all major

components are in the unit. Any missing parts should

be reported to your supplier at once, and replaced with

authorized parts only.

Horizontal, Flat “Cased” Coils

Copper/Aluminum Coils: 4PXFH001AC3HHA, 4PXFH003AZ3HHA,

4PXFH004AC3HHA, 4PXFH005AZ3HHA, 4PXFH007AC3HHA,

4PXFH009AZ3HHA

Installer’s Guide

C. RECOMMENDATIONS

CAUTION

This coil is pressurized with 8-12 psig of dry air. Do

not stand directly in front of the coil connections

when removing sealing plugs. If no pressure is

released, check for leaks.

1. If this coil is a part of the total system installation, then

use the Installer’s Guide packaged with the furnaces,

Heat Pump outdoor sections, and Control Center for

physically installing those components.

2. It is recommended that the outline drawing

(page 2) be studied and dimensions properly noted

and checked against selected installation site. By

noting in advance proper clearance allowances for

installation and possible future service of the coil.

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 information pack

upon completion of work.

①

18-AD40D1-1A-EN

WARNING

This product can expose you to chemicals including lead,

which are known to the State of California to case cancer and

birth defects or other reproductive harm. For more information

go to www. P65Warnings.ca.gov D. INSTALLING 4PXFH COIL/

ENCLOSURE

Coil/enclosure assembly can be used for all horizontal

furnaces (gas and electric) applications (Figure 1), and

for applications of vertical upow furnaces (Figure 2),

where the top clearance is insu󰀩cient for installing an

“A” coil and enclosure, and there is access to a run of

horizontal duct.

SUPPLY DUCT

2 FEET MINIMUM

RECOMMENDED

FURNACE

FLUE STACK

TRANSITION DUCT

COIL/ENCLOSURE ASSY

WARNING

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.

2 18-AD40D1-1A-EN

Installer’s Guide

OUTLINE DRAWING - 4PXFH001AC3HHA, 4PXFH004AC3HHA, 4PXFH007AC3HHA, 4PXFH003AZ3HHA, 4PXFH005AZ3HHA, 4PXFH009AZ3HHA

All dimensions are in inches

Ø 3/8” LIQUID

LINE SIZE

23.5

Ø “D” MANIFOLD

TUBE LINE SIZE

INSIDE

DUCT

FLANGE

OPENING

INSIDE DUCT

FLANGE OPENING

ISOMETRIC VIEW

FOR REFERENCE ONLY

5.00

6.50

0.750

5.00

1.875

10.0

1.875

0.750

FLANGES TYP.

MODEL

TRANE # Variable Speed

Compatible A B C D

4PXFH001AC3HHA No 29.5 24.0 21.0 3/4

4PXFH004AC3HHA No 35.5 30.0 21.0 7/8

4PXFH007AC3HHA No 35.5

7/8

4PXFH003AZ3HHA Ye s 35.5 30.0 21.0 3/4

4PXFH005AZ3HHA Ye s 35.5 30.0 21.0 3/4

4PXFH009AZ3HHA Ye s 41.5 36.0 21.0 7/8

AIRFLOW ALLOWED

BOTH DIRECTIONS

Refrigerant

control

NON-BLEED TXV

(Start kit may be

required on outdoor

unit)

ø 3/4 NPT

SECONDARY DRAIN

ø 3/4 NPT

PRIMARY DRAIN

18-AD40D1-1A-EN 3

Installer’s Guide

Since coil/ enclosure assembly must be installed within

the horizontal run of duct, a transition duct must be

fabricated to mate with the furnace supply outlet duct

ange on one end and the duct ange connection on the

coil/ enclosure assembly on the other end.

For maximum performance, it is recommended that the

transition duct be at least 2 feet in length.

1. Secure the transition duct to the furnace with the

furnace in position.

2. The refrigerant lines and condensate connections of

cased coils may be on either side of the supply air

duct. The air may be directed through the coil from

either side of the coil.

3. Attach the coil/ enclosure assembly to the transition

from the furnace, providing proper support for coil/

enclosure assembly’s weight. Keep the coil level.

Extra pitch is not required for coil to drain properly.

4. Secure the downstream side of coil/ enclosure

assembly to the supply air duct.

NOTE:

Secure properly so there will be no air leakage.

5. When hanging the coil for ceiling mounted

applications, do not assemble screws in the cabinet

in areas that may puncture the coil or drainpan. Areas

to be avoided include the back, bottom, front, top

center, and lower 3" of the left and right sides of the

coil cabinet.

6. The indoor coil must be evacuated through the

refrigerant lines at the outdoor unit before opening

the service valves. See evacuation procedure in

Field Fabricated Refrigerant Lines section of the

Installer’s Guide for the outdoor unit.

7. Complete the installation of the unit per installation

instructions.

FLUE

ACK

TRANSITION DUCT

COIL/ENCLOSURE ASSY

SUPPLY DUCT

VERTICAL UPFLOW

FURNACE

②

E. INSTALLING/BRAZING REFRIGERANT

LINES

CAUTION

Do NOT open refrigerant valve at the outdoor

unit until the refrigerant lines and coil have been

brazed, evacuated, and leak checked. This would

cause contamination of the refrigerant or possible

discharge of refrigerant to the atmosphere.

1. The following steps are to be considered when

installing the refrigerant lines:

a.Determine the most practical way to run the lines.

b.Consider types of bends to be made and space

limitations.

c. Route the tubing making all required bends and

properly secure the tubing before making nal

connections.

NOTE:

Refrigerant lines must be isolated from the structure

and the holes must be sealed weather tight after

installation.

IMPORTANT:

Do not unseal refrigerant tubing until ready to t

refrigerant lines.

4 18-AD40D1-1A-EN

Installer’s Guide

3. Swedge using approved industry practices, or use

eld supplied coupler, on indoor unit coil connections.

Connect eld supplied refrigerant tubing to coil

connections.

4. Flow a small amount of nitrogen through the tubing

while brazing.

5. Use good brazing technique to make leakproof joints.

6. Minimize the use of sharp 90 degree bends.

7. Insulate the suction line and its ttings.

8. Do NOT allow un-insulated lines to come into contact

with each other.

F. LEAK CHECK

1. Using a manifold gauge, connect an external supply

of dry nitrogen to the gauge port on the liquid line.

2. Pressurize the connecting lines and indoor coil to

150 PSIG maximum.

3. Leak check brazed line connections using soap

bubbles. Repair leaks (if any) after relieving pressure.

4. Evacuate and charge the system per the instructions

packaged with the outdoor unit.

G. CONDENSATE DRAIN PIPING

(SEE FIGURE 3)

NOTE:

When coils are installed above ceilings or in other

locations where damage from condensate overow

may occur, a eld fabricated auxiliary drain pan

shall be installed under the coil enclosure. Drain

lines from this pan must be installed, but should

NOT be connected to the primary pan. These drain

lines should terminate in an area easily seen by the

homeowner, but not located to drip on sidewalks or

other slip hazard areas.

Condensate drain connections are located in the drain

pan at the bottom of the coil/enclosure assembly. The

female threaded tting protrudes outside of the enclosure

for external connection. A eld fabricated trap is not

required for proper drainage due to the positive pressure

of the furnace; however, it is recommended to prevent

e󰀩ciency loss of conditioned air.

1. The drain hole in the drain pan must be cleared of all

insulation.

2. Insulate the primary drain line to prevent sweating

where dew point temperatures may be met. (Optional

depending on climate and application needs).

3. Connect the secondary drain to a separate drain

line (no trap is needed in this line). The secondary

drain should terminate in an area easily seen by the

homeowner, but not located to drip on sidewalks or

other slip hazard areas.

4. Test drainage of all condensate lines prior to

completing installation.

IMPORTANT:

Plug all drain line connection(s) not used. Do NOT

use heat or torch near drain ttings.

H. DUCT CONNECTIONS

The supply and return air duct should be connected to

the unit with a ame retardant duct connectors. Duct

ange connections are provided at both supply and

discharge openings of the coil.

FIELD FABRICATED TRAP

③

2" MIN.

CAP OR PLUG

Trap must be within 4'

of furnace / air handler

condensate drain connection.

Close as possible

There is only a holding charge of dry air in the indoor coil,

therefore no loss of operating refrigerant charge occurs

when the sealing plugs are removed.

1. Remove sealing plugs and use pipe cutter to remove

spun closed ends.

2. Field supplied tubing should be cut square, round

and free of burrs at the connecting end. Clean the

tubing to prevent contaminants from entering the

system.

18-AD40D1-1A-EN 5

Installer’s Guide

CAUTION

TXV sensing bulb is sensitive to heat. Do not

assemble to suction/vapor line until after eld

brazing is complete and line is cool to touch.

I. TXV BULB HORIZONTAL MOUNTING

The orientation and location of the TXV bulb has a major

inuence on the system performance.

It is recommended that the TXV bulb be installed parallel

to the ground (on a horizontal plane). The bulb position

should be at 2 o-clock or 10 o-clock. See Figure 4 for

recommended position of TXV bulb in the horizontal

plane.

J. TXV BULB VERTICAL MOUNTING

While it is recommended that the TXV sensing bulb

is mounted in the horizontal plane, some installation

congurations may require that the sensing bulb be

mounted vertically. In this instance, place the bulb such

that the capillary tubes are directed upwards as shown in

Figure 5.

The TXV sensing bulb should be mounted away from any

bends on a clean smooth section of suction/vapor line,

using the metal clamp provided. In order to obtain a good

temperature reading and correct superheat control, the

TXV sensing bulb must conform to the following criteria:

1. The sensing bulb must be in direct and continuous

contact with the suction line.

2. The sensing bulb should be mounted horizontally on

the suction line.

3. The sensing bulb should be mounted at the 2 o'clock

or 10 o'clock position on the circumference of the

suction line.

4. The sensing bulb must be insulated from outside air.

A properly mounted sensing bulb will prevent false

readings caused by liquid refrigerant that may have

formed inside the suction/vapor line. Insulation will

protect the sensing bulb from false readings due to

contact with warm air.

SENSING BULB

SUCTION LINE

Bulb position at

2 o’clock or

10 o’ clock

Refrigerant &

Oil Flow

Direct Capillary

Tube Upwards

Metal

Strap

Sensing Bulb location

on pipe wall opposite

to that being hit by

refrigerant and

oil leaving the

distributor tubes

Suction

Line

④

⑤RECOMMENDED LOCATION FOR

VERTICAL TXV BULB MOUNT

RECOMMENDED LOCATION FOR

HORIZONTAL TXV BULB MOUNT

6 18-AD40D1-1A-EN

Installer’s Guide

Is sub cooling at the

outdoor unit between

8 to 12F?

YES Is superheat

< 5F?YES

Correct air

flow

problem

Is air flow at least

350 CFM per ton?

YES

Remove sensing bulb from the

suction line. Measure superheat

at indoor coil while holding the

bulb in bare hand for one minute.

Does superheat decrease?

Measure superheat at indoor coil

while placing the bulb in an ice

and water bath for one minute.

Does superheat increase?

YES

Replace the

TXV

TXV is OK

Is superheat

< 20F?

YES

Is indoor

temperature more

than 85F?

Is sub cooling less

than 8F?

YES

Confirm that charge

is correct and look

for dirty or restricted

outdoor coil.

Confirm that

charge is

correct.

Before starting,insure the

blower wheel, indoor and outdoor

coils are clean.

Is the liquid line

temperature at indoor

coil within 8F of outdoor

liquid line temperature?

YES

Verify line set is

sized properly

for application

The system is running at max

capacity and this may be

causing the High superheat.

Wait until indoor temperature

is less than 80F and check

superheat again.

YES

Verify inlet screen

of inlet tube

assembly is clear

of debris

NO Has TXV screen

been checked and

cleaned?

YES

Inlet screen located in liquid line. Check, clean, &

replace if necessary.

18-AD40D1-1A-EN 7

Installer’s Guide

Wrap TXV with wet cloth before

brazing. Direct torch away from

wrapped valve.

About Trane and American Standard Heating and Air Conditioning

Trane and American Standard create comfortable, energy efficient indoor environments for residential applications.

For more information, please visit www.trane.com or www.americanstandardair.com

The manufacturer has a policy of continuous data improvement and it reserves the right to change design and specifications without notice. We are

committed to using environmentally conscious print practices.

18-AD40D1-1A-EN 18 Dec 2020

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