Trane Oxbox J4MXCA003EC6HCA Assembly instructions

INSTALLER’S GUIDE
Multi-Position Cased Coils
Cooling and Heat Pump Compatible
Factory Installed R410a Metering Device
Thank you very much for purchasing our product.
Before using your unit, please read this manual carefully and keep it for future reference.
The figure shown in this manual is for reference only and may be slightly different from the actual product.

CONTENTS
1SAFETY 01
03
03
03
Replacement Parts
Pre-installation Instruction
Installation And Trap Connection
3.1
3.2
3.3
3INSTALLATION INSTRUCTIONS
05
05
06
Condensate Drain Piping
Plastic Drain Pan Installation
4.1
4.2
4DRAIN APPLICATION
06
07
Piston Installation
Optional TXV Kit Installation
6.1
6.2
6PISTON/TXV INSTALLATION
5REFRIGERANT CONNECTIONS
08
7AIR FLOW PERFORMANCE
01
02
02
02
Unit Dimensions
Codes & Regulations
Inspection Upon Unit Arrival
Clearances
2.1
2
2.2
2.3
2.4
GENERAL
RECOGNIZE THIS SYMBOL AS AN INDICATION OF IMPORTANT SAFETY
INFORMATION
WARNING
These instructions are intended as an aid to qualified licensed service personnel for proper installation, adjustment
and operation of this unit. Read these instructions thoroughly before attempting installation or operation. Failure to
follow these instructions may result in improper installation, adjustment, service or maintenance possibly resulting in
fire, electrical shock, property damage, personal injury or death.
This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning
use of the appliance by a person responsible for their safety.
Children should be supervised to ensure that they do not play with the appliance.
WARNING
Proposition 65: This appliance contains fiberglass insulation. Respirable particles of fiberglass are known to the state
of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.”
WARNING

01
1 SAFETY
2 GENERAL
2.1 Unit Dimensions
The coil can be positioned for bottom return air in the upflow and horizontal right applications. It must be positioned for top
return when in downflow and horizontal left applications. See Figure 2-1. For furnace applications, the coil must be installed
downstream (in the air outlet) of the furnace
WARNING
Disconnect all power to the unit before starting any service and maintenance. Failure to do so could cause severe
electrical shock resulting in personal injury or death.
Installation or servicing of this unit can be hazardous due to parts, components and system pressure.
Qualified and proper trained service personnel should perform installation and repair. Failure to do so could cause
severe electrical shock resulting in personal injury or death.
This is a safety alert symbol indicating a potential hazardous situation ,which could result in personal injury, property
and/or product damage or death.
NOTE
This coil comes with a factory-installed heat shield on the drain pan.
Fig.2-1 CASED DIMENSIONS AND COMPONENT LOCATION
W
W1
H
A
19"
21"
21"
This is a safety alert symbol indicating a potential hazardous situation ,which could result in moderate personal injury,
and/or property and product damage.
CAUTION

02
2.2 Codes & Regulations
2.3 Inspection Upon Unit Arrival
Unit Dimensions
DIMENSIONAL DATA
J4MXCA003EC6HCA
J4MXCB004EC6HCA
J4MXCC005EC6HCA
J4MXCB006EC6HCA
J4MXCC007EC6HCA
J4MXCD008EC6HCA
J4MXCB016EC6HCA
J4MXCC017EC6HCA
J4MXCD018EC6HCA
J4MXCC009EC6HCA
J4MXCD010EC6HCA
20"[508]
20"[508]
20"[508]
26"[660]
26"[660]
26"[660]
30"[762]
30"[762]
30"[762]
30"[762]
30"[762]
14-1/2"[368]
17-1/2"[445]
21"[533]
17-1/2"[445]
21"[533]
24-1/2"[622]
17-1/2"[445]
21"[533]
24-1/2"[622]
21"[533]
24-1/2"[622]
13"[330]
16"[407]
19-1/2"[495]
16"[407]
19-1/2"[495]
23"[584]
16"[407]
19-1/2"[495]
23"[584]
19-1/2"[495]
23"[584]
13-1/2"[343]
16-1/2"[419]
20"[508]
16-1/2"[419]
20"[508]
23-1/2"[597]
16-1/2"[419]
20"[508]
23-1/2"[597]
20"[508]
23-1/2"[597]
3/8" / 3/4"
3/8" / 3/4"
3/8" / 3/4"
3/8" / 7/8"
3/8" / 7/8"
3/8" / 7/8"
3/8" / 7/8"
3/8" / 7/8"
3/8" / 7/8"
3/8" / 7/8"
3/8" / 7/8"
46[21]
49[22]
51[23]
60[27]
62[28]
66[30]
73[33]
73[33]
77[35]
82[37]
86[39]
MODELS UNIT HEIGHT
"H" IN. [mm]
UNIT WIDTH
"W" IN. [mm]
SUPPLY
DUCT "A"
IN. [mm]
"W1" IN. [mm] LIQUID LINE/
VAPOR LINE
WEIGHT
(LBS.[kg])
This product is designed and manufactured to comply
with national codes.
Installation in accordance with such codes and/or
prevailing local codes/regulations is the responsibility of
the installer. The manufacturer assumes no responsibili-
ty for equipment installed in violation of any codes or
regulations.
The United States Environmental Protection Agency (
EPA) has issued various regulations regarding the
introduction and disposal of refrigerants. Failure to follow
these regulations may harm the environment and can
lead to the imposition of substantial fines. Should you
have any questions please contact the local office of the
EPA.
As soon as unit is recived, it should be inspected and
noted for possible shipping damage during transporta-
tion. It is carrier's responsibility to cover the cost of
shipping damage. Manufacturer or distributor will not
accept a claim from contractors for any transportation
damage.
2.4 Clearances
Following clearances should be provided during installa-
tion
a. Maintenance and service access, including coil cleaning
and coil assembly removal
b. Refrigerant piping and connections
c. Condensate drain line
Ensure the proper installation, Select a solid and level site.
Ensure enough space required for installation and mainte-
nance.
≥20"
Fig. 2-2 Front view of the indoor unit clearance
(including air duct)
Fig. 2-3 Top View of the indoor unit clearance (including
air duct)
≥24"
≥1"
≥0
≥1"

03
3.1 Replacement Parts
3.2 Pre-installation Instruction
3.3 Installation And Trap
Connection
3 INSTALLATION INSTRUCTIONS
Contact your distributor for authorized replacement
parts.
Carefully read all instructions for installation prior to
installing the product. Make sure each step or procedure
is understood and any special considerations are taken
into account before starting installation. Assemble all
tools, hardware and supplies needed to complete the
installation. Some items may need to be purchased
locally.
Make sure everything needed to install the product is on
hand before starting.
1. See Fig. 3-1 for coil installation and drain connection.
2. Installation steps for cased coil:
A. Shut off or disconnect gas furnace's power and
remove gas pipe if necessary;
B. Disconnect and remove a sufficient portion of the
supply ductwork to provide clearance for the cased coil.
C. Ensure that the coil is leveled and seal the gap
between coil and furnace.
See Fig. 3-1. In case that coil and the furnace sizes are
not matched, use proper size of sheet metal or other
material to fill the gap and seal the gap to prevent air
leak;
D. Reconnect the ductwork to the coil case, and seal any
leakage;
E. Reconnect Power line on gas furnace, turn on the
Fig. 3-1 INSTALLATION OF CASED COIL

04
Fig. 3-2 Transition for horizontal left orientation
3. If the coil is used in connection with an upflow furnace in horizontal left orientation, a sheet metal transition can be installed
between the furnace supply air outlet and the evaporator coil supply air inlet to create clearance between coil lineset and
furnace flue outlet for A-cabinet non-condensing furnaces and for all cabinet size condensing furnaces. See Fig. 3-2
For A-cabinet non-condensing furnaces, a 6" transition is needed.
For all cabinet size condensing furnaces, a 6.5" transition is needed.
If space is a constraint, the lines/flue interference can be removed by rotating the coil such that the lineset is facing the opposite
direction and air flow through the bottom of the A-coil, thus optimizing airflow.
NOTE
Transition not needed with S-Series furnaces.

05
4 DRAIN APPLICATION
4.1 Condensate Drain Piping
4.2 Plastic Drain Pan Installation
Consult local codes for special requirements.
To provide extra protection from water damage, it is
always recommended to install an additional drain pan,
provided by installer under the entire unit with a separate
drain line. Manufacturer will not be responsible for any
damages due to the failure to follow these recommenda-
tions.
WARNING
Do not use the coil pan shipped with the unit on
oil furnaces or any application where the temper
-ature of the drain pan may exceed 275°F. A field
fabricated metal drain pan can also be used for
these type of applications.
Failure to follow this warning may result in
property damage and/or personal injury.
Use Teflon tape on the drain line connections. Do
not use pipe joint compound or PVC/CPVC
cement on drain nipple.
NOTE
Water coming from this line means the coil
primary drain is plugged and needs clearing.
NOTE
The coil drain pan has a primary and an optional second-
ary drain with 3/4" NPT female connections; use either
PVC or copper pipe and hand tighten to a torque of
approximately 37 in-lbs. to prevent damage to the drain
pan connection. An insertion depth between 0.355 to
0.485 inches (3-5 turns) should be expected at this
torque setting.
Use male 3/4" NPT threaded fitting for outside connec-
tion and make sure the drain holes are not blocked.
Insulation may be needed for drain line to prevent sweat-
ing.
Drain pan has two drain connections on each side to
provide flexibility of connection and drainage. Make sure
pan has proper pitch and plugged if second connection is
not used.
If the secondary drain line is required, run the line
separately from the primary drain and terminate it where
it can be easily seen.
Install a trap in the drain line below the bottom of the
drain pan. If using a copper drain line, solder a short
piece of pipe to the connector before installing a drain
fitting. DO NOT over torque the 3/4" copper connector to
the plastic drain connection. Use a wet rag or heatsink
material on the short piece to protect plastic drain pan,
complete the rag or heatsink material on the short piece
to protect plastic drain pan, complete the drain line
installion (Fig. 4-1). Use (Fig. 4-2) as a template for
typical drain pipe routing.
This figure shows how to avoid interference with vent
piping.
Fig. 4-1 DRAIN LINE INSTALLATION
Fig. 4-2 DRAIN PIPE ROUTING

06
5 REFRIGERANT CONNECTIONS
6 PISTON/TXV INSTALLATION
6.1 Piston Installation
A piston does come pre-installed. The piston
must be removed before installing a TXV.
NOTE
Avoid pulling the piston sleeve out when removing
the pre-installed piston.
NOTE
MUST wrap the nut with a wet rag before
brazing.
NOTE
CAUTION
Gently remove the sealing plug of vapor line, use
one wrench to fix valve base, loose the nut with
another wernch, take out the flange pad and
sealing ring.
CAUTION
TXV bulb MUST be protected (wrapped with wet
rag) or removed, while brazing the tubing.
Overheating of the sensing bulb will affect the
fuctional characteristics and performance of the
comfort coil.
To prevent refrigerant leak, use proper tools to ensure
clean, burr-free cut.
Use brazing shield when brazing close to the cabinet
surface and wet rag to protect rubber grommet.
Brazing alloy should be at least 5% silver content.
1. Using a wrench to loosen the nut. Remove the nut and
sealing flange.
2. Check the piston sizes for each outdoor/coil combina-
tion in Table 6-1 and choose the correct piston size for
your combination.
3. If a different size piston is needed for your system
combination, remove the pre-installed piston.
4. Choose correct size piston from the doc pack and
insert it with correct orientation.
5. Replace outer O-ring with the O-ring provided in the
doc pack.
6. Attach the connection pipe with nut and tighten to 1/6th
turn past hand-tighten. Fig 6-1
This coil comes with a factory installed piston metering
device. See Table 6-1 for factory installed piston size.
Some system combinations will require a different sized
piston to be field installed.
* Use the piston size recommended by the outdoor unit if
available.
* Reference Table 6-2 If the outdoor unit dose not list a
piston size.

07
6.2 Optional TXV Kit Installation
WARNING
Failure to install the proper piston can lead to
poor system performance and possible compres-
sor damage.
1.Use a wrench to loosen the nut and remove the
sealing flange and sealing gasket.
2.Take out the connecting pipe from accessory package
and braze the connecting pipe onto the refrigeration-out
pipe.
3.Install the sealing washers, TXV and flange connec-
tion tube.
4.Use a wrench fasten nut and connecting pipe.
(18±2N·m).
5.Connect TXV equalizer pipe to the port on the
connecting pipe.
6.Fix bulbs on the connecting pipe using use accessory
in TXV kit.
Fig 6-2
* The ship-with literature bag will contain additional
R-410A pistons for most applications.
* Contact your local parts center to order the appropriate
piston if it is not included with the literature.
Reference TXV kit literature for installation instructions.
A TXV may be required to achieve minimum efficiency
ratings or for long refrigerant line set applications.
Reference AHRI for system combination ratings.
Reference Table 6-2 to charge the system by superheat
when using piston.
Reference the outdoor unit installation guide to charge
the system when using a TXV.
Table 6-1 Factory installed piston size for each coil
model. Additional piston sizes are provided in the
ship-with literature bag as necessary.
Table 6-3 Piston superheat charging chart
Piston/orifice sizes J4MX
Model
CA003E
CB004E
CC005E
CB006E
CC007E
CD008E
CB016E
CC017E
CD018E
CC009E
CD010E
50 52
X
X
X
X
56 58
X
X
X
X
60
X
X
X
X
X
X
64
X*
X*
X*
X
X
X
X
X
68 70
X
X
X
X
X
X
X
X
X
73 75
X*
X*
X*
X
X
X
X
X
80
X
X
83
X*
X*
X*
X
X
90
X*
X*
* means that this piston is pre-installed
CAUTION
An improperly charged system will likely cause
loss in system performance and may damage
the compressor.
Indoor Temperature(°F) Dry Bulb/Wet Bulb
Outdoor
temp(°F) 95/79 90/75 85/71 80/67 75/63 70/58
Superheat
23
24
26
27
29
30
35
34
35
37
38
40
41
16
17
19
21
23
25
26
28
30
32
34
36
37
7
9
11
13
16
18
20
22
24
26
29
31
33
5
5
5
7
9
12
14
17
19
21
24
27
29
5
5
5
5
5
5
8
11
13
16
19
22
25
5
5
5
5
5
5
5
5
6
10
13
17
21
115
110
105
100
95
90
85
80
75
70
65
60
55
Chart is based on 400CFM/Ton indoor airflow
and 50% relative humidity. If indoor relative
humidity is above 70% or below 20%, use indoor
wet bulb temperature only.
Airflow range is 375 to 425 CFM/Ton
NOTE
Table 6.2. Use chart below when matching coil with
outdoor unit. Addition piston sizes are provided in the
ship-with literature bag as necessary.
Outdoor Unit
Capacity (Tons)
Piston Size*
(R410a) Piston Kit
1.5
2
2.5
3
3.5
4
5
52
58
63
70
75
83
90
MAYORIACHP0052B
MAYORIACHP0058B
MAYORIACHP0063B
MAYORIACHP0070B
MAYORIACHP0075B
MAYORIACHP0083B
MAYORIACHP0090B
Outdoor Unit
Capacity (Tons)
Piston Size*
(R22) Piston Kit
1.5
2
2.5
3
3.5
4
5
52
58
65
72
78
88
96
MAYORIACHP0052B
MAYORIACHP0058B
MAYORIACHP0065A
MAYORIACHP0072B
MAYORIACHP0078B
MAYORIACHP0088B
MAYORIACHP0096B
*Piston size needed for system combination may not be
pre-installed.
See Table 6.1 for pre-installed size.

08
7 AIR FLOW PERFORMANCE
Airflow performance [CFM VS Pressure drop]
Pressure drop characteristics for cooling and heat pump coils
Pressure drop (Inches of water)
Model
J4MXCA003EC6HCA
J4MXCB004EC6HCA
J4MXCC005EC6HCA
J4MXCB006EC6HCA
J4MXCC007EC6HCA
J4MXCD008EC6HCA
J4MXCB016EC6HCA
J4MXCC017EC6HCA
J4MXCD018EC6HCA
J4MXCC009EC6HCA
J4MXCD010EC6HCA
Model
J4MXCA003EC6HCA
J4MXCB004EC6HCA
J4MXCC005EC6HCA
J4MXCB006EC6HCA
J4MXCC007EC6HCA
J4MXCD008EC6HCA
J4MXCB016EC6HCA
J4MXCC017EC6HCA
J4MXCD018EC6HCA
J4MXCC009EC6HCA
J4MXCD010EC6HCA
Upflow
1200
1250
1250
1575
1575
1575
1800
1800
1800
1850
2000
Horizontal Left
1050
1200
1200
1400
1400
1450
1800
1800
1800
1750
1850
Downflow
1050
1050
1050
1400
1400
1450
1700
1700
1700
1750
1850
Horizontal Right
1200
1250
1250
1575
1575
1575
1500
1700
1700
1850
2000
0.05
307
327
360
401
457
496
456
505
533
439
466
0.1
485
527
585
600
663
718
638
726
857
699
764
0.15
618
682
748
773
856
924
810
932
1105
906
978
0.2
729
810
893
916
1019
1102
953
1098
1319
1071
1157
0.25
823
925
1019
1045
1156
1259
1077
1244
1509
1224
1313
0.3
911
1024
1132
1160
1277
1398
1191
1375
1675
1362
1466
0.35
991
1122
1238
1256
1394
1530
1284
1494
1824
1487
1590
0.4*
1063
1217
1348
1357
1502
1651
1390
1604
1956
1589
1695
Data based on wet coil with entering air at 80 degF DB / 67 degF WB without air filter.
The maximum allowable pressure drop is 0.4 IWG.
The maximum CFM is the data at 0.4 IWG pressure.
Maximun airflow setting
NOTE
Water blow-off could occur in certain installation positions if the airflow setting exceeds the maximum values listed.
Maximun airflow seeting (CFM)
Since the manufacturer has a policy of continuous
product and product data improvement, it reserves
the right to change the design and specification
without notice.
c . 2019 TwentyThreeC, LLC
TwentyThreeC, LLC
800 Beaty Street,
Davidson,NC, 28036
For more information contact
your local dealer (distributor)
www.oxboxhvac.com