Midea DHMSHA, DHMSHAQ09XA3, DHMSHAQ12XA1, DHMSHAQ24XA3, DHMSHAQ30XA3 Installation Instructions Manual

DHMSHA
High Wall Ductless System
Sizes 09 to 36

Installation Instructions

TABLE OF CONTENTS

SAFETY CONSIDERATIONS........................................................2

PARTS LIST ....................................................................................3

SYSTEM REQUIREMENTS...........................................................4

WIRING ...........................................................................................4

Fig. 1 — Sizes 09K-36K

Fig. 2 — Remote Controller

DIMENSIONS..................................................................................5

CLEARANCES ................................................................................9

INSTALLATION TIPS....................................................................10

INDOOR UNIT INSTALLATION ..................................................10

ELECTRICAL DATA......................................................................11

CONNECTION DIAGRAMS..........................................................11

WIRELESS REMOTE CONTROL INSTALLATION ...................13

WIRED REMOTE CONTROL INSTALLATION..........................13

START-UP .......................................................................................13

TROUBLESHOOTING ...................................................................14

NOTES:

Read the entire instruction manual before starting the
installation.
Images are for illustration purposes only. Actual models
may differ slightly.

Specifications subject to change without notice.

SAFETY CONSIDERATIONS

Installing, starting up, and servicing air-conditioning equipment can
be hazardous due to system pressures, electrical components, and
equipment location (roofs, elevated structures, etc.).

Only trained, qualified installers and service mechanics should install,
start-up, and service this equipment.

Untrained personnel can perform basic maintenance functions such
as coil cleaning. All other operations should be performed only by
trained service personnel.
When working on the equipment, observe precautions in the literature

and on tags, stickers, and labels attached to the equipment.
Follow all safety codes. Wear safety glasses and work gloves. Keep
a quenching cloth and fire extinguisher nearby when brazing. Use
care in handling, rigging, and setting bulky equipment.
Read these instructions thoroughly and follow all warnings or
cautions included in the literature and attached to the unit. Consult
the local building codes and National Electrical Code (NEC) for
special requirements. Recognize safety information. This is the
safety-alert symbol . When you see this symbol on the unit and
in instructions or manuals, be alert to the potential for personal
injury. Understand these signal words: DANGER, WARNING,
and CAUTION. These words are used with the safety-alert
symbol. DANGER identifies the most serious hazards which will
result in severe personal injury or death. WARNING signifies
hazards which could result in personal injury or death. CAUTION
is used to identify unsafe practices which may result in minor
personal injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced installation,
reliability, or operation.

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

Before installing, modifying, or servicing system, main electrical
disconnect switch must be in the OFF position. There may be more
than 1 disconnect switch. Lock out and tag switch with a suitable
warning label.

WARNING

EXPLOSION HAZARD

Failure to follow this warning could
result in death, serious personal injury,
and/or property damage.

Never use air or gases containing oxygen
for leak testing or operating refrigerant
compressors. Pressurized mixtures of air
or gases containing oxygen can lead to
an explosion.

CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or
improper operation.

Do not bury more than 36 in. (914 mm) of refrigerant pipe in the
ground. If any section of pipe is buried, there must be a 6 in. (152 mm)
vertical rise to the valve connections on the outdoor units. If more
than the recommended length is buried, refrigerant may migrate to the
cooler buried section during extended periods of system shutdown.
This causes refrigerant slugging and could possibly damage the
compressor at start-up.

2 Specifications subject to change without notice. IM-DHMSHA-02

PARTS LIST

Air Outlet

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Interconnecting
Piping/wiring

Table 1 — Parts List

Part No. Part Name Qty

1 Indoor Unit 1

2 Mounting Plate 1

3 Mounting Screw A ST3.9x25-C-H 5

4 Anchor 5

5 Air Filter 1

6 Wireless Remote Control 1

7 Wireless Remote Control Holder 1

8 Wireless Remote Control Mounting Screw B ST2.0x10-C-H 2

- Flare nuts for liquid and gas pipes 1

- Stencil (Mounting Template) 1

- Installation Instructions 1

- Owner's manual 1

- Warranty Card 1

- Carbon Filter 1

Fig. 3 — Parts List

NOTES:

- If the outdoor unit is higher than the indoor unit, prevent rain from flowing into the indoor unit along the connection
pipe by making a inverted trap in the connection pipe before it enters the wall to the indoor unit. This ensures that rain
drips from the connection pipe before it enters the wall.

- Piping and the interconnecting wiring are field supplied.

- The illustration above (Fig. 3) is only a sketch. Different models may be differ slightly.

The units listed in Table 2 are covered in these installation instructions.

Table 2 — Indoor Units

Description kBTUh V-Ph-Hz ID Model No.

High Wall Heat Pump

IM-DHMSHA-02 Specifications subject to change without notice. 3

12 115-1-60 DHMSHAQ12XA1

9 208/230-1-60 DHMSHAQ09XA3
12 208/230-1-60 DHMSHAQ12XA3
18 208/230-1-60 DHMSHAQ18XA3
24 208/230-1-60 DHMSHAQ24XA3
30 208/230-1-60 DHMSHAQ30XA3
36 208/230-1-60 DHMSHAQ36XA3

SYSTEM REQUIREMENTS

Allow sufficient space for airflow and unit service. See Fig. 8 — on page 9 for the minimum required distances between the unit and walls or
ceilings.

Piping

IMPORTANT: Both refrigerant lines must be insulated separately.

• Table 3 lists the pipe sizes for the indoor unit. Refer to the outdoor unit’s installation instructions for other allowed piping lengths and
refrigerant information.

Table 3 — Indoor Unit Pipe Sizes

UNIT SIZES

GAS PIPE

LIQUID PIPE

12K

(115V)

in 1/2 3/8 1/2 1/2 5/8 5/8 5/8

(mm) 12.7 9.52 12.7 12.7 16 16 16

in 1/4 1/4 1/4 1/4 3/8 3/8 3/8

(mm) 6.35 6.35 6.35 6.35 9.52 9.52 9.52

9K

(208/230V)

12K

(208/230V)

18K

(208/230V)

24K

(208/230V)

30K

(208/230V)

36K

(208/230V)

WIRING

All wires must be sized per NEC (National Electrical Code) or CEC
(Canadian Electrical Code) and local codes. See the rating plate and/
or the installation instructions of the compatible outdoor unit for MCA
(minimum circuit amps) and MOCP (maximum over current
protection) to correctly size the wires and the disconnect fuse or
breakers respectively.

Recommended Connection Method for Power and
Communication Wiring:

The main power is supplied to the outdoor unit. The field supplied 14/
3 power/communication wiring from the outdoor unit to the indoor
unit consists of four (4) wires and provides the power for the indoor
unit. Two wires are high voltage AC power, one is communication
wiring and the other is a ground wire. Wiring between the indoor and
outdoor unit is polarity sensitive. The use of BX wire is NOT
recommended.

If installed in a high Electromagnetic field (EMF) area and
communication issues exists, a 14/2 stranded shielded wire can be
used to replace L2/N and (S) between outdoor unit and indoor unit
landing the shield onto ground in the outdoor unit only.

WARNING

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage
or improper operation.

Wires should be sized based on NEC and local codes.

CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage
or improper operation.
Be sure to comply with local codes while running wire from
the indoor unit to the outdoor unit.
Every wire must be connected firmly. Loose wiring may
cause the terminal to overheat or result in unit malfunction. A
fire hazard may also exist. Ensure all wiring is tightly
connected.
No wire should touch the refrigerant tubing, compressor or
any moving parts.
Disconnecting means must be provided and shall be located
within sight and readily accessible from the air conditioner.
Connecting cable with conduit shall be routed through the
hole in the conduit panel.

NOTE: The main power is supplied to the outdoor unit.

When disconnecting the power of the outdoor unit,
the indoor unit would lose power. A disconnect
switch is not required on the Indoor unit side on
the wiring between the Outdoor and Indoor unit. A
3 pole disconnect may be used for extra protection
between the Indoor and Outdoor Unit.

4 Specifications subject to change without notice. IM-DHMSHA-02

DIMENSIONS

Fig. 4 — Indoor Unit

Table 4 — Dimensions

High Wall Unit Size 12K 9K 12K 18K 24K 30K 36K

Voltage (115V) (208/230V) (208/230V) (208/230V) (208/230V) (208/230V) (208/230V)

Height In (mm) 11.07 (281) 11.07 (281) 11.07 (281) 12.40 (315) 13.39 (343) 13.39 (343) 13.39 (343)

Width In (mm) 33.17 (842) 33.17 (842) 33.17 (842) 38.98 (990) 46.69 (1186) 46.69 (1186) 46.69 (1186)

Depth In (mm) 8.75 (222) 8.75 (222) 8.75 (222) 8.58 (218) 10.16 (258) 10.16 (258) 10.16 (258)

Weight- Net Lbs (kg) 19.18 (8.7) 19.18 (8.7) 19.18 (8.7) 24.46 (12.0) 40.12 (18.2) 40.12 (18.2) 40.12 (18.2)

IM-DHMSHA-02 Specifications subject to change without notice. 5