Bryant MA1A, MH1A Installation And Start-up Instructions Manual

installation and

MA1A

start-up instructions

10 SEER
RESIDENTIAL SELF-CONTAINED
AIR CONDITIONER/HEAT PUMP UNITS

NOTE: Read the entire instruction manual before starting the
installation.

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause personal injury or property damage.
Consult a qualified installer, service agency, or your distributor or
branch for information or assistance. The qualified installer or
agency must use factory-authorized kits or accessories when
modifying this product. Refer to the individual instructions pack­aged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses and work gloves.
Read these instructions thoroughly and follow all warnings or
cautions attached to the unit. Consult local building codes and the
National Electrical Code (NEC) for special installation require­ments.

Recognize safety information. This is the safety-alert symbol
When you see this symbol on the unit or in instructions and
manuals, be alert to the potential for personal injury.

Understand the signal words DANGER, WARNING, and CAU­TION. These words are used with the safety-alert symbol. DAN­GER identifies the most serious hazards which willresultinsevere
personal injury or death. WARNING signifies hazards which
could result in personal injury or death. CAUTION is used to
identify unsafe practices which would result in minor personal
injury or product and property damage.

WARNING: Before installing or servicing system, al­ways turn off main power to system. There may be more
than 1 disconnect switch. Turn off accessory heater
power if applicable. Electrical shock can cause personal
injury or death.

INTRODUCTION

The MA1A Air Conditioner and MH1A Heat Pump are UL Listed
per Standard UL 1995/UL 559 for use in manufactured homes.
These units are available in the cooling sizes shown in Table 1.

The MA1A and MH1A are single package units. All components
including outdoor coil, compressor, and refrigerant tubing are
located in 1 single package. The units are already piped, charged,
and wired.

Refer to Fig. 2 for basic unit dimensions.

INSTALLATION

These units were designed for installation in manufactured homes,
but can be installed in a variety of other applications. These
instructions detail the method of installation for use in manufac­tured housing or other similar applications. Fig. 3 illustrates a
typical installation of this type. Study this drawing prior to starting
installation. It may be helpful to refer back to this drawing during
installation. Consult your distributor and the Application Guide­line document for details regarding other installation applications.

MH1A

Cancels: New II MA1A-18-1

12-95

.

Fig. 1—Model MA1A/MH1A

TABLE 1—UNIT SIZES AND AVAILABLE

ELECTRIC HEAT

UNIT SIZE BTUH COOLING AVAILABLE KW

018 18,000 0—5—10
024 22,000 0—5—10
030 28,000 0—5—10—15
036 34,600 0—5—10—15—20

I. UNPACK UNIT AND INSPECT EQUIPMENT

Remove unit from carton and inspect for any shipping damage. Do
not install a damaged unit. Optional components used with unit
may include a thermostat, base and roof assembly kit, fresh air kit,
or return-air grille and air filter assembly.

Remove pallet by removing 4 bolts attaching pallet to base of unit.

CAUTION: The condensate drain outlet protrudes from
base of unit. To avoid damage to floors and floor
coverings, unit must be transported on an appliance dolly.
Do not slide unit on floor. Transport unit on appliance
dolly from side or rear only. Transporting unit from front
will damage air intake grille and lower coil. When setting
unit onto base template, unit may be carefully tilted from
front by a hand truck.

A95337

—1—

7 7⁄16″

5 1⁄4″

10 11⁄16″

5 3⁄4″

11 9⁄16″ 10 3⁄8″

4 15⁄16″

BLOWER TOP

SCHEME NO. 1

20″ 25″

6 7⁄16″

4 5⁄8″

14-IN. ROUND

H

BLOWER TOP

SCHEME NO. 2

9 3⁄8″

8 9⁄16″

4 3⁄4″

ROOF

WALL

THERMOSTAT

THERMOSTAT WIRES

FROM THERMOSTAT

BLOCK

ROOM AIR INTAKE

AND FILTER

CONDENSATE DRAIN HOSE

(PIPE TO OUTSIDE OF STRUCTURE)

OUTDOOR-AIR
EXHAUST

14″ INSULATED
FLEX DUCT

PRIMARY
ELECTRICAL
SUPPLY
CONNECTIONS

OUTDOOR-AIR
PLENUM

INDOOR
PLENUM

INDOOR SUPPLY
DUCT

A95338

NOTE: If a door is used to enclose unit, refer to "Installation of
Unit Behind a Louvered Door or Enclosed in Closet" in Setup
section.

Fig. 3—Typical Installation

3 11⁄16″
1 13⁄16″

9 3⁄4″

DRAIN

1 1⁄32″

12 3⁄4″

18″

6 13⁄16″

9″

18 9⁄16″

5 1⁄2″

A95358

DIMENSIONS (IN.)

UNIT SIZE H BLOWER TOP SCHEME

018 57 Scheme No. 2
024 57 Scheme No. 2
030 67 Scheme No. 1
036 67 Scheme No. 1

Fig. 2—Unit Reference Drawing

II. ASSEMBLE SUPPLIES NEEDED FOR
INSTALLATION

The standard method of installation for units in manufactured
homes is with accessory base and roof assembly kit.

NOTE: If installing any other kit, Installation Instructions will be
furnished with kit.

In addition to items included in base and roof assembly kit, the
following items are required to install unit. All sizes listed are
suggested.

• Adhesive duct tape, U.L. 181 aluminum or equivalent.

WARNING: Incorrect type of duct tape may be a fire
hazard. A failure to follow this warning could result in a
fire or explosion, and personal injury or death.

• 8 No. 10 X 1/2 rust-resistant, self-tapping sheet metal screws
(holding roof flashing).

• Permanent sealant such as "mastic."

• 4 wood screws (base template).

• 2 No. 8 X 3/4 wood screws (unit to floor). Do not overtighten
and compress seal.

• Silicone caulking (roof flashing)

• Thermostat cable (18 gage wire minimum).

NOTE: The number of conductors needed depends on type of
unit and thermostat being installed. Air conditioning units require
4- or 5-conductor wire depending on type of thermostat being
used. (Some thermostats require a C terminal connection for
proper operation.) Heat pump units require 6-conductor wire.

CAUTION: Do not use thermostat wire with less than
the recommended number of conductors.

CAUTION: Failure to adhere to indoor air, outdoor air,
and exhaust air requirements as listed in the following
sections will void unit warranty.

III. SETUP
A. Indoor-Air Duct Requirements

The MA1A and MH1A units are designed to be installed in 1 of
the following ways:

1. Installed flush with the wall. (See Fig. 4.)

2. Recessed behind a louvered door. (See Fig. 5.)

3. Installed in a closet with 1 or 2 return-air grilles. (See Fig.

6.) Refer to Installation of Unit Behind a Louvered Door or
Enclosed in Closet section for grille sizes.

—2—

REMOVABLE WALL 

INDOOR-AIR COLLAR

(12

11

⁄

16

″ X 8

15

⁄16″

X 9

1

⁄4″

DEEP)

OUTDOOR-AIR PLENUM



(5

7

⁄16″

X 17

15

⁄16″

X 19

1

⁄4″

DEEP)

203⁄

4

″

251⁄

4

″

24″

24″

BASE 
TEMPLATE

FOAM

SEAL

DRAIN CUP

FRONT OF UNIT

METAL AIR
DUCT

NOTE: DO NOT OBSTRUCT OUTDOOR-AIR PLENUM OPENING.



PANEL FOR 
UNIT'S SERVICE

REMOVABLE TRIM
FOR UNIT'S SERVICE
(DO NOT GLUE)

Fig. 4—Unit Installed with Front Exposed

OPTIONAL
LOCATION

NOTE: THE UNIT
MUST BE ACCESSIBLE
FOR SERVICE.

A95339

A95341

Fig. 6—Unit Installed in Closet with Return-Air Grille

CAUTION: The minimum installation clearance be-

tween both the indoor-air plenum and first 2 ft of metal
duct to any combustible material is 1 in. (See Fig. 7.) The
remainder of unit and duct work is approved for 0-in.
clearance.

Fig. 5—Unit Installed behind a Louvered Door

B. Indoor Supply Air Duct

The MA1A and MH1A units are designed to operate at a given
static pressure. The duct system, regardless of size, must not
exceed 0.3 in. static pressure. The design and construction of duct
system must also provide adequate air distribution to ensure
comfort levels throughout home.

If unit is being installed to replace another furnace or heating
system, a check of airflow rate (CFM) should be performed. If
airflow rate does not meetspecifications,duct alterations or repairs
must be made to correct airflow problem.

A95340

A95342

Fig. 7—Indoor-Air Plenum and Duct Clearances

C. Recommended Unit Clearances

For serviceability and elimination of compressor vibration trans­mission, it is recommended that the sides and back of unit be
installed with a minimum 1-in. clearance from walls. It is also
recommended that top of unit be installed with a clearance large
enough to allow removal of unit should it be necessary.

—3—

D. Installation of Unit Behind a Louvered Door or
Enclosed in Closet

If unit is installed behind a louvered door and louvers are directly
in front of unit’s intake grille, a 2-in. clearance is recommended
between door and front of unit. If louvers are installed in upper part
of door so they are not directly in front of intake grill, a minimum
7-in. clearance is recommended between door and front of unit.
This also applies if a solid wall is used instead of a louvered door.
Should the louver be installed somewhere other than in front of
unit (for example, to the side of unit), consult your distributor
before proceeding to obtain recommended clearances. The recom­mended minimum return-air requirements to be used are shown in
Table 2.

APPROX.

8

″

181⁄2″

2″ TYP.

WALLS

2″

FRONT OF UNIT

FLOOR JOIST 
FRAMING

191⁄2″

FLOOR

TABLE 2—MINIMUM RETURN-AIR REQUIREMENTS

UNIT SIZE NET FREE OPEN AREA (SQ IN.)

018 300
024 375

030, 036 450

IV. PREPARE FLOOR AND BASE
A. Install Installation Kit

Installing installation kit requires a hole through floor of home
approximately 18-1/2 in. wide by 19-1/2 in. deep to provide access
from unit to supply duct trunk and outside air.

NOTE: The diagrams show a typical installation. The actual
method of installation will be dictated by model and manufacturer
of the home. Installer will determine the best method to use.

1. Construct a boxed-in area of framework under unit location
slightly larger than the 18-1/2-in. by 19-1/2-in. hole to
provide adequate support for unit. (See Fig. 8.)

FLOOR JOIST

≈181⁄

″

2

≈191⁄

″

2

HOME DUCT TRUNK

A95344

Fig. 9—Dimensions of Hole

FOAM AIR SEAL

INDOOR AIR 

COLLAR

OUTDOOR AIR 

PLENUM

BEND 

ALTERNATE 

TABS

INDOOR AIR 

CUTOUT

13″ x 91⁄8″

DUCT TRUNK

NOTE: THE DRAIN CUP, FOAM AIR SEAL, OUTDOOR-AIR 
PLENUM, AND INDOOR-AIR COLLAR ARE PREASSEMBLED 
AT FACTORY.

91⁄8″

FLAT-HEAD
WOOD SCREW

DO NOT USE
FRONT INSIDE
HOLES

BASE
TEMPLATE

DRAIN CUP

13″

DRAIN HOSE

(PIPE TO OUTSIDE 

OF STRUCTURE)

A95345

Fig. 10—Installation of Base Template, Indoor-Air Collar,

and Outdoor-Air Plenum

SUPPLY-AIR DUCT

Fig. 8—Typical Framework Construction

2. Locate supply duct trunk so that it runs under front edge of
hole. Back edge of supply duct trunk should be approxi­mately 8 in. from back of hole. (See Fig. 9.)

3. After floor section is complete; locate, mark, and cut a hole
through floor approximately 18-1/2 in. by 19-1/2 in. (See
Fig. 9.)

4. Place base template assembly over hole and mark indoor-air
plenum cutout in supply duct trunk measuring 13 in. by
9-1/8 in. (See Fig. 10.) Mark condensate drain hose and
outdoor-air plenum cutouts in insulation and vapor barrier
or drain to outside.

A95343

CAUTION: Be careful not to crimp drain hose attached
to condensate drain cup.

CAUTION: Failure to route drain hose where it will not
be kinked will cause drain trap to overflow, leaking water
onto floor.

5. Remove base template assembly. Reach through hole and
cut holes through vapor barrier and insulation for outdoor­air plenum and condensate drain hose to extend through or
drain to outside. Also cut 13-in. by 9-1/8-in. hole in duct
trunk. (See Fig. 10.)

6. Bend every other tab up 90 degrees on indoor-air collar as
shown in Fig. 10.

7. Insert base template assembly into supply duct and secure it
with 4 flat-head screws, 1 in each corner. Bend remaining
tabs up 90 degrees locking indoor-air collar securely to
supply duct trunk. Use mastic or foil-type duct tape to seal
any openings. (See Fig. 10.)

—4—

NOTE: Do not let indoor-air collar extend down into duct. It
MUST be flush with top of duct trunk. If collar does not fit
properly, minor adjustments may have to be made to collar.

8. Use Flex-Mend or equivalent RTV caulk to seal bottom
board to outdoor-air plenum.

WARNING: Non-foil-type tapes will not withstand the
temperature of heated air from unit and may be a fire
hazard. Failure to tape joint will allow heated or cooled
air to leak beneath home. A failure to follow this warning
could result in a fire or explosion, and personal injury or
death.

V. INSTALL UNIT
A. Setting Unit

CAUTION: Do not move unit on an unprotected floor.

Damage to floor will result.

TEMPORARILY COVER HOLE
WHILE THE 15-IN. CUTOUT IN
THE CEILING AND ROOF
ARE BEING MADE

WOOD SCREWS

1. If necessary, use an appliance dolly to position unit into
enclosure, being careful not to disturb foam seal on tem­plate. When unit’s front edge is in line with front edge of
base template, set unit upright onto base template. (See Fig.

11.)

BASE TEMPLATE

NOTE: TILT UNIT APPROXIMATELY 45° WHILE MOVING IT

INTO PLACE TO AVOID DISTORTION OF FOAM SEAL.

A95347

Fig. 11—Setting Unit on Base Template

NOTE: SCREW HOLES IN BOTTOM RAIL OF UNIT MUST 
ALIGN WITH HOLES IN METAL BASE TEMPLATE.

A95348

Fig. 12—Securing Unit to Floor

4. Cover unit top as shown in Fig. 12. Cut a hole with a
diameter of approximately 15 in. through ceiling and roof
directly over outdoor-air exhaust. If hole in roof and ceiling
cannot be aligned directly over each other, a small bend in
the flexible duct may be required. Acceptable misalignment
of hole in ceiling and transition is a maximum of 2 in. per
each 12 in. of flex duct in elevation, up to a maximum of 6
in.

5. Seal any opening with mastic to prevent loss of conditioned
air into attic space.

B. Exhaust Air Venting

1. Apply a generous amount of mastic to roof surface and
around hole cut for outdoor-air duct to pass through. (See
Fig. 13.) Lower duct down through hole in roof and ceiling
and fasten flashing to roof with screws.

APPLY MASTIC TO
SEAL ROOF CAP
TO ROOF

15-IN. DIAMETER 
HOLE

CAUTION: Only minor movement is allowed when
aligning holes in unit base with holes in template to
prevent damage to foam air seal.

2. Remove front grille of unit (if necessary) as shown in Fig.
12 and make minor adjustments in location of unit if
necessary to align screw holes in bottom rail of unit with
screw holes in base template.

3. The unit should be secured permanently to structure by
driving 2 wood screws through mating holes in bottom rail
of unit and base template into floor. Tighten screws flush to
foam seal. Overtightening screws will tip unit forward on
foam seal. Do NOT use any other procedure to permanently
secure unit to structure.

ROOF

CEILING

A95349

Fig. 13—Outdoor-Air Duct Installation

2. Apply additional mastic or sealant around flashing perim­eter base to provide protection against rainwater leaking
under flashing.

—5—