MRCOOL MAHM060ETA Installation Manual
The Signature Series is NOT designed for amateur installation. Installation SHOULD be performed by an authorized technician.
Please read this manual carefully before installation and keep it for future reference.
Owner & Installation
Manual
Signature Series
MAHM*ETA AIR Handler
The Signature Series is NOT designed for amateur installation. Installation SHOULD be performed by an authorized technician.
Please read this manual carefully before installation and keep it for future reference.
INSTALLATION INSTRUCTIONS
MAHM*ETA Series Air Handler
This manual must be left with the homeowner for future reference.
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in
manuals, be alert to the potential for personal injury or death.
Table of Contents
Shipping and Packing List ...........................................3
General........................................................................3
Requirements ..............................................................3
Installation Clearances ................................................4
Installation ...................................................................4
Condensate Drain........................................................6
Duct System and Filters .............................................8
Brazing Refrigerant Lines............................................9
Sealing the Unit .........................................................11
Electrical Connections............................................... 11
.........................................15
...............................16
Operation Inspection .................................................16
Operation...................................................................17
Maintenance..............................................................17
Professional Maintenance .........................................17
Cabinet Insulation......................................................18
Use of Air Handler During Construction.....................18
.......2
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.
sheet metal edges can result in personal injury. Take
and protective clothing.
CAUTION
Manufactured By
MRCOOL LLC
Hickory, KY 42051
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting
of refrigerant (CFCs, HCFCs and HFCs) as of July
1, 1992. Approved methods of recovery, recycling or
may be levied for noncompliance.
Save these instructions for future reference
507788-01C mrcool.com Page 1 of 20
*P507788-01C*
(P) 507788-01C
MAHM*ETA
1 (25)
LINE VOLTAGE
INLETS
(Top and Left Side)
3/4
(19)
1 (25)
14-1/2
(368)
TOP VIEW
CIRCUIT
BREAKER
COVER
SUPPLY AIR
OPENING
C
B
1 (25)
LOW VOLTAGE
INLETS
(Top and Right Side)
2-3/8
(60)
4-3/8
(111)
LINE VOLTAGE
INLETS
(Top and Right Side)
LOW VOLTAGE
INLETS
(Either Side)
DETAIL OF PIPING PLATE
3/4 (19)
SUCTION
LINE
LIQUID
LINE
2-3/4
(70)
1-3/4
(44)
4-3/4
(121)
CONDENSATE
CONDENSATE
3-1/2
(89)
22
(559)
DRAINS (2)
(Horizontal)
DRAINS (2)
(Upflow and
Downflow)
NOTE:
Dimensions
A
B
C
D
A
1-1/8
(29)
AIR FLOW
PIPING
PLATE
D
OPENING
CONDENSATE DRAIN
PIPING PLATE (3)
(2-1/4 x 3-3/4)
FILTER
ACCESS
1-1/8
(29)
SUCTION
LINE
LIQUID
LINE
1/2
(13)
20-3/8
(518)
OPENING
1-1/8
(29)
FRONT VIEW SIDE VIEW
024 030 036 / 042 048 060
in. mm in. mm in. mm in. mm in. mm
1156 47 1194 1362 55 1397 1518
470 470 546 546 546
419 419 495 495 495
413 413 489 489 489
507788-01Cmrcool.comPage 2 of 20
Shipping and Packing List
pertaining to this type of equipment should be determined
Package 1 of 1 contains:
Check the air handler for shipping damage; if found,
immediately contact the last carrier. Check the unit rating
General
The MAHM*ETA
is designed for indoor installation only. As shipped, the
right-hand air discharge applications. Horizontal drain
in the horizontal left-hand air discharge position. Various
accessories are available and listed in the MAHM*ETA Product
This instruction is intended as a general guide and does
authorities having jurisdiction before installation.
as the instructions supplied in separate equipment, before
starting the installation.
In addition to conforming to manufacturer’s installation
instructions and local municipal building codes, installation
(NFPA) standards: “Standard for Installation of Air
Conditioning and Ventilation Systems” (NFPA No. 90A)
and “Standard for Installation of Residence Type Warm Air
Heating and Air Conditioning Systems” (NFPA No. 90B).
All models are designed for indoor installation only. The
must conform to the requirements of the National Electrical
Local authorities having jurisdiction should be consulted
before installation is made. Such applicable regulations
or requirements take precedence over the general
instructions in this manual.
NOTE:
Requirements
WARNING
can result in back or other type of injury.
IMPORTANT
MAHM*ETA
varying capacities. These units must be installed as
a part of a matched system as outlined in the MAHM*ETA
These instructions are intended as a general guide and do
the Installation of Warm Air Heating and Air-Conditioning
Systems (latest edition).
The air handler is shipped from the factory completely
connection of the duct system.
Do not remove the cabinet knockouts until it has been
the installation.
conditions. Consider required clearances, space, routing
requirements for refrigerant line, condensate disposal,
information.
WARNING
materials and vapors, such as gasoline,
that heating elements are at least 18 inches
authorities having jurisdiction before installation.
507788-01C mrcool.com Page 3 of 20
instructions can result in death, explosion,
IMPORTANT
Excessive condensation may occur if the unit is installed
unconditioned space, apply sealant around electrical
Apply sealant on the inside of the cabinet at the
electrical controls.
single-story buildings.
When a MAHM*ETA
be:
• 320 square inches for -024 models;
• 360 square inches for -030 and -036 models;
• 450 square inches for -042 thru -060 models
determine if the open area meets the minimum open area
listed above.
IMPORTANT
This unit is approved for installation clearance to
combustible material as stated on the unit rating
plate. Accessibility and service clearances must take
precedence over combustible material clearances.
The air handler must be installed so that free access is
compartment.
NOTE:
NOTE:
NOTE:
NOTE:
If a return air plenum is used, the return air grille should be
the opening, there must be adequate clearance around the
Installation
and controls in an insulated galvanized steel factory-
For ease in installation, it is best to make any necessary
place.
Refrigerant Metering Device
MAHM*ETA
heat pump application.
NOTE:
Installation Clearances
Non-Ducted Return Closet Installation
bottom to form a return air plenum. It may also be installed
HORIZONTAL DRAIN PAN
(MUST BE REMOVED)
UP-FLOW /
DOWN-FLOW
DRAIN PAN
Figure 1.
507788-01Cmrcool.comPage 4 of 20
1. The air handler must be supported on the bottom only
frame.
2.
horizontal drain pan.
NOTE:
3.
end of the unit and level from front to back of unit (see
Figure 7).
4.
5. If the unit is suspended, the entire length of the cabinet
must be supported. If you use a chain or strap, use a
piece of angle iron or sheet metal attached to the unit
3. Place the unit in the desired location and slope unit.
Connect return and supply air plenums as required
4. Install units that have no return air plenum on a stand
air return.
Horizontal Applications
IMPORTANT
When removing the coil, there is a possibility of danger
of equipment damage and personal injury. Be careful
in right- or left-hand applications. The coil may tip into
the drain pan once it is clear of the cabinet. Support the
NOTE:
NOTE:
air plenums as required.
ANGLE IRON OR SHEET
METAL
MAXIMUM 1/2"
LONG SCREW
AIR FLOW
FRONT WEIVDNEWEIV
E
ANCE 4 IN. (102 MM)
Figure 3. Suspending Horizontal Unit
Left-Hand Air Discharge
1. Remove access panels and the corrugated padding
corrugated padding.
2. Pull the coil assembly from unit. Pull off the horizontal
drain pan.
3. Remove the drain plugs from back drain holes on
horizontal drain pan and reinstall them on front holes.
IMPORTANT
After removal of drain pan plug(s), check drain hole(s)
AIR FLOW
Drains
RIGHT‐HAND DRAINS
PLUGS
Figure 2.
Right-Hand Discharge
1.
connections.
2. With access door removed, remove drain line plugs to
install drain lines.
507788-01C mrcool.com Page 5 of 20
to verify that drain opening is fully open and free of any
debris. Also check to make sure that no debris has
fallen into the drain pan during installation that may plug
up the drain opening.
4. Rotate drain pan 180º front-to-back and install it on the
opposite side of the coil.
5.
6. Remove plastic plug from left hole on coil front end
seal and reinstall plug in back hole.
CABINET
SUPPORT
DRAIN PAN
REINSTALLED
HERE
90º
BEND
TOP CAP ROTATED TO
CORRECT POSITION
TOP CAP SCREWS
DRAIN PAN
SHIPPING
LOCATION
NOTE:
9. Flip access door and replace it on the unit.
10.
end of the unit. Connect return and supply air plenums
11. If suspending the unit, it must be supported along the
entire length of the cabinet. If using chain or strap,
use a piece of angle iron or sheet metal attached to
illustrated in Figure 3. Connect return and supply air
REINSTALLED HERE REMOVED FROM HERE
COIL SHOWN IN UPLOAD POSITION FOR EASY CONVERSION
TOP
CAP
90º
BEND
———— DRAIN PLUGS ————
ALIGN HOLES WITH
HOLES IN COIL END
PLATE. STARTING WITH
THE ROUND HOLES ON
THIS END.
BACK COIL END SEAL
Figure 4.
7.
back coil end plates. The top cap has a 45º bend on
one side and a 90º bend on the other. The 90º bend
must be on the same side as the horizontal drain pan
as illustrated in Figure 4.
NOTE:
IMPORTANT
installed in a
circuit breakers must be rotated 180° to the UP position.
See ECBA25 installation instructions for more details.
MAHM*ETA
Condensate Drain
IMPORTANT
Figure 5.
NOTE:
8.
support rail as illustrated.
in the condensate drain lines (primary and auxiliary,
through the drain lines into the air supply.
FRONT EDGE OF HORIZONTAL
DRAIN PAN
IMPORTANT
pipe to the outside of the building, is required in all
pan. In some localities, local codes may require a
secondary drain pan for any horizontal installation.
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