Trane OXBOX JMM4A0A18S21SAA Assembly instructions

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.
The JMM4A series wall mount air handler is designed for installation in a closet, utility room,
alcove and can be wall mounted. These versatile units are applicable to air conditioning
applications. Field installed electric resistance heaters are available.
•5, 7.5 and 10 kW SINGLE PHASE ELECTRIC
HEATERS
- Circuit breakers are standard on all single
phase 5,
7.5 and 10 kW heaters.
•All aluminum coil.
•Factory installed piston style refrigerant control-
Field installed TXV kits available.
•Blower and coil slide out easily for maintenance.
•Factory-sealed cabinet certified to achieve 2% or
less air leakage rate at 1.0 inch water column.
•Front or bottom return air.
•Painted finish on galvanized steel.
•Sturdy polycarbonate drain pans.
- Air handler has factory installed drain pan and
is shipped for upflow applications only.
•208/230 VAC operation.
•Stud or wall mount installation.
•Fully insulated cabinet.
•3/4'' NPT primary and secondary drains.
•AHRI certified and ETL listed.
A
18-GF12D1-1A-EN
JMM4A0A18S21SAA
JMM4A0A24S21SAA
JMM4A0B30S21SAA
JMM4A0B36S31SAA

SAFETY HAZARD! This information is intended for use by
individuals possessing adequate backgrounds of electrical
and mechanical experience. Any attempt to repair a central air
conditioning product may result in personal injury and/or
property damage. The manufacturer or seller cannot be
responsible for the interpretation of this information, nor can it
assume any liability in connection with its use.
Important: These instructions do not cover all variations in systems
nor provide for every possible contingency to be met in connection
with the installation. Should further information be desired or should
particular problems arise which are not covered sufficiently for the
purchaser’s purposes, the matter should be referred to your
installing dealer or local distributor.
Important: Installation of this unit shall be made in accordance with
the National Electric Code, NFPA No. 90A and 90B, and any other
local codes or utilities requirements.
Note: The small air handlers have been evaluated in accordance
with the Code of Federal Regulations, Chapter XX, Part 3280 or the
equivalent. “SUITABLE FOR MOBILE HOME USE.”
WARNING
WARNING
WARNING
WARNING
WARNING
WARNING
HAZARDOUS VOLTAGE!
Disconnect all electrical power, including remote disconnects
before installing or servicing. Follow proper lockout/tagout
procedures to ensure the power can not be inadvertently
energized. Failure to disconnect power before servicing could
result in death or serious injury.
LIVE ELECTRICAL COMPONENTS! During installation,
testing, servicing, and troubleshooting of this product, it may
be necessary to work with live electrical components. Failure
to follow all electrical safety precautions when exposed to live
electrical components could result in death or serious injury.
EXPLOSION HAZARD!
Do not store corrosive or combustible materials, gasoline, or
other flammable vapors or liquids near the unit. Failure to
follow this warning could result in property damage, serious
personal injury, or death.
ELECTRICAL HAZARD!
Grounding Required! Follow proper local and state electrical
code on requirements for grounding. Failure to follow this
warning could result in property damage, serious personal
injury, or death.
HAZARDOUS VAPORS! Do not install an air handler with a
non-ducted return in the same closet, alcove, or utility room
as a fossil fuel device. Hazardous vapors can be distributed
throughout the conditioned space and equipment damage can
result.
Section 2. Safety Information
WARNING
PROPOSITION 65: This appliance contains fiberglass
insulation. Respirable particles of fiberglass are known to State
of California to cause cancer.
All manufacturer products meet current federal OSHA
Guidelines for safety. California Proposition 65 warnings are
required for certain products, which are not covered by the
OSHA standards.
California’s Proposition 65 requires warnings for products sold in
California that contain or produce any of over 600 listed
chemicals known to the State of California to cause cancer or
birth defects such as fiberglass insulation, lead in brass, and
combustion products from natural vapor.
All “new equipment” shipped for sale in California will have
labels stating that the product contains and/or produces
Proposition 65 chemicals. Although we have not changed our
processes, having the same label on all our products facilitates
manufacturing and shipping. We cannot always know “when, or
if” products will be sold in the California market.
You may receive inquiries from customers about chemicals
found in, or produced by, some of our heating and
air-conditioning equipment, or found in natural vapor used with
some of our products. Listed below are those chemicals and
substances commonly associated with similar equipment in our
industry and other manufacturers.
Glass Wool (Fiberglass) Insulation
Carbon Monoxide (CO)
Formaldehyde
Benzene
More details are available at the websites for OSHA
(Occupational Safety and Health Administration), at
www.osha.gov and the State of California’s OEHHA (Office of
Environmental Health Hazard Assessment), at www.oehha.org.
Consumer education is important since the chemicals and
substances on the list are found in our daily lives. Most
consumers are aware that products present safety and health
risks, when improperly used, handled and maintained.
2

CAUTION
CORROSION HAZARD! To prevent shortening its service life,
the air handler should not be used during the finishing phases
of construction. The low return air temperatures can lead to
the formation of condensate. Condensate in the presence of
chlorides and fluorides from paint, varnish, stains, adhesives,
cleaning compounds, and cement creates a corrosive
condition which may cause rapid deterioration of the cabinet
and internal components.
CAUTION
SAFETY HAZARD! Sharp Edge Hazard. Be careful of sharp
edges on equipment or any cuts made on sheet metal while
installing or servicing. Personal injury may result.
WARNING
Make sure the blower motor support is tight
(3-motor mount bolts) then check to see if
wheel is secured to motor shaft before
operating unit.
BLOWER MOT OR
SHIPPING BOLT
3

Carefully unpack the unit and inspect the contents for damage. If
any damage is found at the time of delivery, proper notification and
claims should be made with the carrier.
Check the rating plate to assure model number and voltage.
Furthermore, check that kits match with what was ordered. The
manufacturer should be notified within 5 days of any discrepancy or
parts shortage.
The small air handler should be centrally located and may be
installed in a closet, alcove, utility room, or basement. Minimum
clearances must be met.
The air handler comes standard with two different options for
mounting, wall mount or frame mount. Both mounting options require
the unit to be level from side to side and from front to back in order to
allow condensate to properly drain from the unit. Failure to do this will
result in condensate leaking out from the unit, potentially causing
structural damage to the surrounding support structures, dry wall,
carpet, etc. Also, both mounting structures require the ability to
accommodate a minimum of 150 lb load. Failure to do this will cause
damage to the support structure and potentially damage the unit.
The air handler comes standard
with
an
upper
and lower wall mount
bracket. Reference Figure 3-1 for more detail.
1.
Remove lower wall
mounting
bracket from the back of the unit
by
removing
one screw which attaches the bracket to the air handler.
Note: Discard the screw after you have removed the wall mounting
bracket.
2.
Install bracket on the wall
by using
3
wood screws
(not provided).
Make sure the bracket is level
in
order to
provided proper
drainage
from the unit. Note: Do not attach the wall
mounting
bracket into
unsupported
dry
wall. Make sure that the wood screws are going into
a structure that can suppport a minimum load of 150 lb.
3.
Lift
the air handler above the wall
mounting
bracket and attach the
unit to the installed bracket. Reference Figure 3-1.
4.
Install the additional bottom plate for extra support for this type
mounting (see figure 3-1).
Note: The additional
plate
is shipped in the bottom of the shipping
carton (only for 30/36k unit).
3.2.1 WALL MOUNT
Fig. 3-2 FRAME MOUNT
The air handler comes
with
8 clearance holes
(4
on each
side).
These
holes
are used to mount the air handler inside of a frame structure
(see
Figure 3-2).
When
mounting
in
this
fashion,
make sure that the
wood
screws are mounted from
within
the air handler and not outside
of
the unit. Install the screws from outside the
unit,
and avoid
damaging
the coil.
If
the frame does not
provide support
in
the front
of
the unit and additional
support
is
needed,
open up
the tabs and
fix
the
unit to the frame or other
support
structure
with
screws
(only
for
30K/36K).
Select a solid and level site to ensure
proper
installation of
the
frame mount.
Verify
that there is sufficient space for installation
and maintenance.(See Figure. 3-3)
3.2.2 FRAME MOUNT
Fig. 3-1 WALL MOUNT
Section 3. Installation Instructions
3.1 Unpacking
3.2 Location
WALL STRUTURE
WOOD SCREWS
WOOD SCREWS
PROVIDED WALL
MOUNT BRACKET
NOTE: MOUNTING WALL AND SUPPORTING
STRUCTURE MUST BE ABLE TO SUPPORT A
MINIMUM OF 150 LBS.
PROVIDED AIR HANDLER
MOUNTING BRACKET
NOTE:
IN ORDER TO PREVENT
AIR LEAKAGE,THE TABS
AND SCREW HOLES
NEED TO BE SEALED
UP WHEN THEY ARE
NOT TO BE USED
PROVIDED WALL
MOUNT BRACKET
WOOD SCREWS
SUPPORTING 2" X4"
STRUCTURE
WOOD SCREWS
WALLMOUNT BRACKET
(ONLY FOR 30K/36K)
WALL STRUCTURE
SUPPORTING
2˝X4˝ STRUCTURE
WOOD SCREWS
SUPPORTING
2˝X4˝ STRUCTURE
STUD ATTACHMENT
HOLES
THE TABS
BRACKET PLACEMENT FOR
HANGING IN A CLOSET
damage. See Figure 3-2 for frame mount installation.
studs. If they are not used, the unit may fall down or cause other
on a wood frame, the screws should be used to fix the unit to the
wood screws are recommended. When the unit is installed
˝
#12 x 1 ½
The (8) wood screws are not provided with the unit.
IMPORTANT:
4

REMOVE BOTTOM COIL
PANEL OFF PLATE
INSTALL FRONT
COIL PANEL
Fig. 3-4 DIFFERENT AIR SUPPLY
3.2.3 CONFIGURATIONS
Fig.3-3 Space for frame mount
≥0"
Fig. 3-5 HEATER ELEMENTS INSTALLATION
ELECTRIC HEATER KITS
Bottom Return Conversion: Divert the return air from the factory
standard front return to a bottom return.Remove the cross brace
when converting cabinet to bottom return.
3.3 Duct Work
Field ductwork must comply with the National Fire Protection
Association NFPA 90A, NFPA 90B and any applicable local
ordinance.
WARNING
Do not, under any circumstances, connect return ductwork to any
other heat producing device such as fireplace insert, stove, etc.
Unauthorized use of such devices may result in fire, carbon
monoxide poisoning, explosion, personal injury or property
damage.
Sheet metal ductwork run in unconditioned spaces must be insulated
and covered with a vapor barrier. Fibrous ductwork may be used if
constructed and installed in accordance with SMACNA Construction
Standard on Fibrous Glass Ducts. Ductwork must comply with
National Fire Protection Association as tested by U/L Standard 181
for Class I Air Ducts. Check local codes for requirements on
ductwork and insulation.
• Duct system must be designed within the range of external static
pressure the unit is designed to operate against. It is important that
the system airflow be adequate. Make sure supply and return
ductwork, grills, special filters, accessories, etc. are accounted for in
total resistance. See airflow performance tables in this manual.
• Design the duct system in accordance with “ACCA” Manual “D”
Design for Residential Winter and Summer Air Conditioning and
Equipment Selection. Latest editions are available from: “ACCA” Air
Conditioning Contractors of America, 1513 16th Street, N.W.,
Washington, D.C. 20036. If duct system incorporates flexible air
duct, be sure pressure drop information (straight length plus all
turns) shown in “ACCA” Manual “D” is accounted for in system.
• Supply plenum is attached to the 3/4” duct flanges supplied with
the unit.
• IMPORTANT: If an elbow is included in the plenum close to the
unit, it must not be smaller than the dimensions of the supply duct
flange on the unit.
• IMPORTANT: If connected to the blower casing, the front flange
on the return duct must not be screwed into the area where the
power wiring is located. Drills or sharp screw points can damage
insulation on wires located inside unit.
• Secure the supply and return ductwork to the unit flanges, using
proper fasteners for the type of duct used and tape the duct-to-unit
joint as required to prevent air leaks.
3.4 Condensate Drain
The unit is supplied with primary and auxiliary condensate drains
that have 3/4” NPT connections. Both drains must be trapped
outside the unit and piped in accordance with applicable materials
and building codes. Do not reduce the drain line size less than
the connection size on the drain pan. Condensate should be piped to
an open drain or to the outside. All drains must pitch downward away
from the unit a minimum of 1/4” per foot of line to ensure
proper drainage. Insulate the primary drain line to prevent sweating
where dew point temperatures may be met. (Insulation is
optional depending on climate and application needs.)
Important: If cleanout Tee is used, standpipe must be sealed/capped.
Top view of the indoor unit clearance(including air duct).
≥20"
≥0"
≥24"
≥0"
Front of unit
AIRFLOW
5

• Low voltage control connections are made to low voltage pigtails
extending from top of air handler (see Figure 1). Connections for
control wiring are made with wire nuts. Control wiring knockouts (7/8˝)
are also provided on the right and left side of the unit for side connec-
tion.
• See wiring diagrams attached to indoor and outdoor sections to be
connected.
• Make sure, after installation, separation of control wiring and power
wiring has been maintained.
3.8.3 GROUNDING
The unit must be permanently grounded. Failure to do so can
result in electrical shock causing personal injury or death.
• Grounding may be accomplished when installed in accordance with
electrical codes by bonding the metal conduit to the unit cabinet or by
attaching ground wire(s) to ground lug(s) provided in the unit wiring
compartment.
• Ground lug(s) are located close to wire entrance on left side of unit
(upflow). Lug(s) may be moved to marked locations near wire
entrance on right side of unit (upflow) if alternate location is more
convenient.
• Use of multiple supply circuits require grounding of each circuit to
lug(s) provided in unit.
• If required, install a branch circuit disconnect of adequate size,
located within sight of, and readily accessible to the unit.
•IMPORTANT: After the Electric Heater is installed, units are
equipped with one 30-60 amp. circuit breaker. These breaker(s)
protect the internal wiring in the event of a short circuit and serve as
a disconnect. Circuit breakers installed within the unit do not provide
over-current protection of the supply wiring and therefore may be
sized larger than the branch circuit protection.
• Supply circuit power wiring must be 75°C minimum copper
conductors only. See Electrical Data in this section for ampacity,
wire size and circuit protector requirements. Supply circuit protective
devices may be either fuses or “HACR” type circuit breakers.
• Power wiring may be connected to either the right or left side.
Two 7/8” dia. concentric knockouts are provided for connection of
power wiring to unit.
• Power wiring is connected to the power terminal block in unit
electric cabinet.
3.8.2 CONTROL WIRING
IMPORTANT: Class 2 low voltage control wiring should not be run in
conduit with main power wiring and must be separated from power
wiring, unless class 1 wire of proper voltage rating is used.
Select a thermostat that is commonly used with HP or AC single
stage heating/cooling with electric heat. The thermostat will energize
the fan on a demand for heating or cooling.
Install the thermostat on an inside wall, away from drafts, lights or
other heat sources in a location that has sufficient air circulation from
other rooms being controlled by the thermostat. The thermostat
should be mounted 4 to 5 feet above the floor.
• Low voltage control wiring should be 18 Awg. color-coded. For
lengths longer than 100 ft., 16 Awg. wire should be used.
Field wiring must comply with the National Electric Code (C.E.C. in
Canada) and any applicable local ordinance.
Disconnect all power to unit before installing or servicing. More
than one disconnect switch may be required to de-energize the
equipment. Hazardous voltage can cause severe personal injury
or death.
3.8.1 POWER WIRING
It is important that proper electrical power is available for connection
to the unit model being installed. See the unit nameplate, wiring
diagram and electrical data in the installation instructions.
WARNING
WARNING
3.5 Refrigerant Piping
Refrigerant pipe connections are located on the top of the unit.
Refrigerant piping external to the unit shall be sized in accordance
with the instructions of the outdoor equipment. When units are
recessed mounted in the wall, make certain that piping connections
are pressure tested prior to the wall being closed. While brazing, be
sure to protect the cabinet and grommets from heat damage.
3.6 Metering Device
All units are shipped and installed with throttle designed for air
conditioning operation. Pressures equalize after shut down. Some
outdoor models may require a start assist kit. See outdoor unit for
more information.
3.7 Blower
3.8 Wiring
3.10 Thermostat
An air filter must be installed before air enters the evaporator coil in
order to protect the coil, blower, and other internal parts from
excessive dirt and dust A filter must be installed. Consult the filter
manufacturer for proper sizing and maximum velocity requirements.
3.9 Air Filter
This unit is supplied with a multi-speed PSC motor with a direct
drive blower wheel which can obtain various air flows. The unit is
shipped with factory set cooling and heating speed taps. Airflow
performance tables are available for additional speed taps.
Disconnect all power to the unit before making any adjustments to
the motor speed taps. Be sure to check the air flow and the
temperature drop across the evaporator coil to ensure sufficient air
flow.
Filter Sizes
18/24 16Χ20[406Χ508]
MODEL FILTER SIZE IN [mm]
30/36 20Χ20[508Χ508]
6

Section 4. Wiring
White
AC SYSTEMS
R
G
C
W1
B
Y
R
G
B/C
Y
W
Brown
24 V AC HO T
FA N
24 V AC
Common
COOLING
HEA T
Thermostat Air Handler Outdoor
Unit
3.11 Sequence of Operation
Cooling (cooling only)
When the thermostat calls for cooling, the circuit from R to G is
completed. The blower motor is energized directly by the 24VAC
signal from the thermostat.
The circuit from R to Y is also completed, energizing the compressor
contactor of the outdoor unit. The contactor will close and start the
compressor and condenser fan motor.
Heating (electric heat only)
Note: The thermostat must be setup to bring the blower on when the
electric heat is energized.
When the thermostat calls for heating, the circuit from R to G is
completed and the blower motor is energized directly by the 24VAC
signal from the thermostat. The circuit from R to W is completed
energizing the heating contactor(s).
3.12 Operational And Checkout Procedures
To obtain proper performance, all units must be operated and charge
adjustments made in accordance with procedures found in the
Service Facts document of the outdoor unit.
After installation has been completed, it is recommended that the
entire system be checked against the following list:
[ ] 1. Be sure unit suspension (if used) is secure and there are
no tools or loose debris in, around or on top of the unit.
[ ] 2. Properly insulate suction lines and fittings.
[ ] 3. Properly secure and isolate all refrigerant lines.
[ ] 4. Verify that all electrical connections are tight.
[ ] 5. Check all duct outlets; they must be open and unrestricted.
[ ] 6. Check drain lines and be sure all joints are tight.
[ ] 7. Be sure the return air filter is installed.
[ ] 8. Operate complete system in each mode to verify proper
performance. Verify operation of supplementary electric heater.
7
3.13 Maintenance
The system air filter(s) should be inspected, cleaned or replaced at
least monthly. Make certain that the access panels are replaced and
secured properly before placing the unit back in operation. This
product is designed for dependable service; however, periodic
maintenance should be scheduled and conducted by trained
professional service personnel. This service should be conducted at
least annually, and should include testing and inspection of electrical
and refrigerant components. The heat transfer surface should be
cleaned. The blower motor is permanently lubricated for normal
operating conditions.
Table 1 Superheat Charging Chart
Outdoor
Temp(oF)
Indoor Temperature(oF) Dry Bulb/Wet Bulb
95/79 90/75 85/71 80/67 75/63 70/58
Superheat (°F)
115 23 16 7 5 5 5
110 24 17 9 5 5 5
105 26 19 11 6 5 5
100 27 21 13 7 5 5
95 29 23 16 8 5 5
90 30 25 18 12 6 5
85 32 26 20 16 9 5
80 34 28 22 17 11 5
75 35 30 24 19 13 6
70 37 32 26 21 16 10
65 38 34 29 24 19 13
60 40 36 31 27 22 17
55 41 37 33 29 25 21
Note: Chart is based on 400 CFM/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.
This air handler comes with a factory-installed piston metering
device. A TXV may be required to achieve minimum efficiency
ratings or for long refrigerant line set applications. Reference AHRI
for system combination ratings.
Charge the system by superheat when using a piston. Reference the
outdoor unit installation guide to charge the system by subcooling
when using a TXV.

Fig. 4-1
POWER
NOTES:
1: Use copper wire(75 min), to be wired in accordance with N.E.C. and local codes.
2: If any of the original wire as supplied must be replaced,use the same or equivalent type wire.
3: Remove the red lead from 240V terminal and then connect the red lead to 208V terminal on the transformer for 208 volts.
4:
5: TDB has a 90-100s off delay when G is de-energized.
6:ConnectRto R,Gto G, etc. See outdoor or indoor instructions for details.
7:Cooling controls wiring not used with electric heaters,
8: N.E.C., class2,24volts.
Factory default fan speed is medium; FM red wire connected to FR #4. For HI speed connect FM black wire to FR #4. For LOW speed
connect FM blue wire to FR #4 and FM red wire to FR #6. Always connect the unused FM wire to the dummy terminal CN3.
connect the plug to electric heaters kit when applied.
FM
TATSOMREHTOT
PLUG PLATE
SEE NOTE 4
SCHEMATIC DIAGRAM
COMPONENT ARRANGEMENT
CAUTION:
ATTENTION:
NOT SUITABLE FOR USE ON SYSTEMS EXCEEDING 150V TO GROUND
NE CONVIENT PAS AUXINSTALLATIONS DE PLUS DE 150V ALA TERRE
L1
L2
FM
DISC
SEE NOTE 6
SEE NOTE 3
ELECTRIC HEAT WIRING CONNECTION
(WHEN APPLIED)
SEE RATING PLATE FOR VOLTS&HERTZ
FUSE
PUR GRN
SEE NOTE 6
8

Section 6. Performance and Electrical Data
JMM4A0A18 21SAA
JMM4A0A24 21SAA
JMM4A0B30 21SAA
Section 5. - Heater Pressure Drop Table - Use For All TMM4B Wall Mount Air Handler Models
SKC A R FO REBMUN
NUMBER
OF RACKS
NUMBER OF RACKS
W O LFRIA
MODEL CFM
123
.G. W SEHCNI - PO R D ERUSSERP RIA
1400
JMM4A0B30 ,36
JMM4A0A18, 24
0.06 0.08 0.08
1300 0.06 0.08 0.08
1200 0.06 0.08 0.08
1100 0.06 0.08 0.08
1000 0.06 0.08 0.08
900 0.04 0.06 0.06
800 0.04 0.06 0.06
700 0.04 0.06 0.06
900 0.04 0.06 0.06
800 0.04 0.06 0.06
700 0.04 0.06
600 0.04 0.06
0.06
0.06
500 0.04 0.06 0.06
SKC A R RET A EH
LEDOM RET A EH N O SKC A R FO .
B A YHTRJ505BRKA*
1
B A YHTRJ508BRKA*
2
B A YHTRJ510BRKA*
3
Accessory Heater Usage
SIZES
USED WITH kW INTERNALCIRCUIT PROTECTION
51 C iucri t Breaker
.72 5 C iucri t Breaker
3
18 63-
18 63-
18 3- 6 10 C iucri t Breaker
Minimum CFM
MODEL 1 2 3
450 500 600
450 500 600
700 725 750
JMM4A0B36 31SAA
700 725 750
(WALL-MOUNT AIR HANDLERS ARE SUITABLE
FOR MOBILE HOME APPLICATIONS)
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
High 813 775 731 692 653 609 560 501 424
Med 695 656 620 581 540 498 440 380 -
Low 603 562 525 485 443 393 - - -
High 947 895 847 799 753 704 655 592 530
Med
845 801 759 716 675 626 573 510 -
Low
676 640 602 563 523 499 - - -
High 1367 1312 1252 1192 1131 1063 990 908 821
Med 1211 1165 1114 1065 1016 960 899 833 748
Low 992 952 912 873 828 782 728 656 627
High
1397 1345 1290 1263 1196 1116 1051 980 907
Med
1298 1252 1198 1147 1094 1037 976 910 842
Low 1149 1105 1056 1008 960 909 856 791 726
36
EXTERNAL STATIC PRESSURE (in.w.c.)
24
30
MODEL
JMM4A
BLOW ER
SPEEDS
18
--- Shaded boxes represent airflow outside the required 300-450 cfm/ton.
NOTES:
1. Airflow based upon dry coil at 230V with no electric heat and factory---approved filter.
2. Airflow is equivalent for front or bottom return configurations.
The air distribution system has the greatest effect on airflow. The duct system is totally controlled by the contractor. For this reason, the contractor
should use only industry-recognized procedures.
Duct design and construction should be carefully done. System performance can be lowered dramatically through bad planning or workmanship.
Air supply diffusers must be selected and located carefully. They must be sized and positioned to deliver air along the perimeter of the space. If
they are too small for their intended airflow, they become noisy. If they are not located properly, they cause drafts. Air grilles must be properly sized
to carry air back to the blower.If they are too small, they also cause noise.
The installers should balance the air distribution system to ensure proper quiet airflow to all rooms in the home. This ensures a comfortable living
space.
Airflow performance data is based on cooling performance with a coil and no filter in place. Select performance table for appropriate unit size.
External static applied to unit allows operation within the minimum and maximum limits shown in table below for both cooling and electric heat
operation.
PSC-Airflow Performance (Standard CFM)
9

6.1 UNIT DIMENSIONS
Fig. 5-1 DIMENSIONS
Low voltage
connection
Breaker switch
(for electric heater
only)
D1
D
W1
W
H
Return air opening
Liquid line connection
copper (sweat)(3/8"dia pipe)
Vapor line connection
copper (sweat)(3/4"dia pipe)
High voltage connection
7/8 " dia knock outs
All units are configured for vertical upflow.
Units cannot be installed in any other configuration.
Front return shown. Units may
also be installed as bottom
return. See the applications
section for more detail.
Primary drain conncetion 3/4"
female pipe thread (NPT)
Auxiliary drain connection
3/4" female pipe thread
(NPT)
NOTE:Hand tighten only
Section 7. Dimensional Data
DIMENSIONAL DATA
18 88/101 (40)/(46)
MODEL SIZE
Dimensions inch (mm)
UNIT HEIGHT
"H" IN.(mm)
UNIT WIDTH
"W" IN.(mm)
UNIT LENGTH
"D" IN.(mm)
88/101 (40)/(46)
24
UNIT WIDTH
"W1" IN.(mm)
UNIT WEIGHT
/SHIPPING
WEIGHT (LBS.(kg))
UNIT LENGTH
"D1" IN.(mm)
30
36
106/124.4 (48)/(56.4)
106/124.4 (48)/(56.4)
10
36-1/2 (928) 20-1/2 (521) 17-2/5 (442) 15 (381) 9-1/2 (242)
39-1/2 (1004) 22 (559) 18-4/5 (478) 19 (483) 9-1/2 (242)
36-1/2 (928) 20-1/2 (521) 17-2/5 (442) 15 (381) 9-1/2 (242)
39-1/2 (1004) 22 (559) 18-4/5 (478) 19 (483) 9-1/2 (242)

11
ABC
DIMENSION DATA
Fig. -2 BACK DIMENSIONS
A B C
JMM4A0A18S21SAA
24-9/10"[150]10-1/8"[61]119-1/20"[717]
JMM4A0A24S21SAA
24-9/10"[150]10-1/8"[61]119-1/20"[717]
JMM4A0B30S21SAA
24-9/10"[150]10-1/8"[61]132"[795]
JMM4A0B36S31SAA
24-9/10"[150]10-1/8"[61]132"[795]
Model number
Dimension inch [mm]

Twenty ThreeC,LLC
Davidson NC,28036
For more information contact
your local dealer (distributor)
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.
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16123000A19244 V2.0
www.oxboxhvac.com
. 2019TwentyThreeC, LLC
800 Beaty Street,