38MHR
Outdoor Unit Single Zone Ductless System
Sizes 09 to 24
Installation Instructions
NOTE: Read the entire instruction manual before starting the
installation.
NOTE: Images are for illustration purposes only. Actual models
may differ slightly.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 2.........................
PARTS LIST 3.......................................
SYSTEM REQUIREMENTS 4...........................
WIRING 4...........................................
DIMENSIONS − OUTDOOR 5..........................
CLEARANCES − OUTDOOR 8.........................
INSTALLATION TIPS 9................................
OUTDOOR UNIT INSTALLATION 9.....................
ELECTRICAL DATA 11...............................
CONNECTION DIAGRAMS 11.........................
SYSTEM VACUUM AND CHARGE 12...................
START−UP 13........................................
OUTDOOR UNIT DIAGNOSTIC GUIDES 13..............
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 by
trained service personnel only.
When working on the equipment, observe the precautions in the
literature and on tags, stickers, and labels attached to the
equipment.
Follow all safety codes. W ear safety glasses and work gloves. Keep
a quenching cloth and a 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 literature and attached to the unit. Consult
local building codes and National Electrical Code (NEC) for
special requirements. Recognize safety information.
!
!
This is the safety−alert symbol
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.
. When you see this symbol on
!
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.
!
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.
WARNING
!
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
2
PARTS LIST
Table 1—Parts List
PART NO. PART NAME QTY.
1 Outdoor unit 1
- Literature package including installation instructions and warranty 1
- Grommet to secure the outdoor unit (helps with vibration prevention during unit operation) 4
- Drain Joint 1
- Drain Hose 1
■ Outdoor
1
Fig. 1 - Parts List
NOTE:
− 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 downward arc 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 is only a sketch. Different models may be slightly different.
The following units are covered in these installation instructions.
Table 2—Unit Sizes
SYSTEM TONS BTUh VOLTAGE - PHASE OUTDOOR MODEL
0.75 9,000 115-1 38MHRC09A--1
1.00 12,000 115-1 38MHRC12A--1
Cooling Only
Heating Pump
0.75 9,000 208/230-1 38MHRC09A--3
1.00 12,000 208/230-1 38MHRC12A--3
1.50 18,000 208/230-1 38MHRC18A--3
2.00 24,000 208/230-1 38MHRC24A--3
0.75 9,000 115-1 38MHRQ09A--1
1.00 12,000 115-1 38MHRQ12A--1
0.75 9,000 208/230-1 38MHRQ09A--3
1.00 12,000 208/230-1 38MHRQ12A--3
1.50 18,000 208/230-1 38MHRQ18A--3
2.00 24,000 208/230-1 38MHRQ24A--3
A150766
3
SYSTEM REQUIREMENTS
Allow sufficient space for airflow and service of the unit. See Fig. 5 for the required minimum distances between the unit, walls or ceilings.
Piping
IMPORTANT: Both refrigerant lines must be insulated separately.
S Table 3 contains piping information for the product covered within this document.
T able 3—Piping and Refrigerant Information
System Size 9K (115V) 12V (115V) 9K (208-230V) 12K (208-230V) 18 (208-230V) 24K (208-230V)
Min. Piping Length ft. (m) 10(3) 10(3) 10(3) 10(3) 10(3) 10(3)
Piping
Refrigerant
Standard Piping Length
Max. outdoor-indoor
height difference
(OU higher than IU)
Max. outdoor-indoor
height difference
(IU higher than OU)
Max. Piping Length with
no additional refrigerant
charge per System
(Standard Piping length)
Total Max. Piping
Length per system
Additional refrigerant
charge (between Standard
– Max piping length)
Suction Pipe
(size - connection type)
Liquid Pipe
(size - connection type)
Refrigerant Type Type R410A R410A R410A R410A R410A R410A
Cooling Only Models
Charge Amount
Heat Pump Models
Charge Amount
ft. (m)
ft. (m)
ft. (m)
ft. (m) 25(7.5) 25(7.5) 25(7.5) 25(7.5) 25(7.5) 25(7.5)
ft. (m) 82(25) 82(25) 82(25) 82(25) 98(30) 164(50)
Oz/ft
(g/m)
In (mm) 3/8(9.52) 1/2(12.7) 3/8(9.52) 1/2(12.7) 1/2(12.7) 5/8(15.9)
In (mm) 1/4(6.35) 1/4(6.35) 1/4(6.35) 1/4(6.35) 1/4(6.35) 3/8(9.52)
Lbs (kg) 1.06(0.48) 1.30(0.59) 1.06(0.48) 1.30(0.59) 2.09(0.95) 2.65(1.2)
Lbs (kg) 1.76(0.8) 2.12(0.96) 1.76(0.8) 2.12(0.96) 3.30(1.5) 3.968(1.8)
25(7.5) 25(7.5) 25(7.5) 25(7.5) 25(7.5) 25(7.5)
32(10) 32(10) 32(10) 32(10) 65(20) 65(20)
32(10) 32(10) 32(10) 32(10) 65(20) 65(20)
0.161(15) 0.161(15) 0.161(15) 0.161(15) 0.161(15) 0.322(30)
All outdoor units have an electronic expansion valve to manage the refrigerant flow of the fan coil connected.
WIRING
All wires must be sized per NEC (National Electrical Code) or
CEC (Canadian Electrical Code) and local codes. Use Electrical
Data table MCA (minimum circuit amps) and MOCP (maximum
over current protection) to correctly size the wires and the
disconnect fuse or breakers respectively.
Per the caution note, only stranded copper conductors with a 600
volt insulation rating wire must be used.
Recommended Connection Method for Power and
Communication Wiring:
The main power is supplied to the outdoor unit. The field supplied
14/3 stranded wire with ground with a 600 volt insulation rating,
power/communication wiring from the outdoor unit to indoor unit
consists of four (4) wires and provides the power for the indoor
unit. Two wires are line voltage AC power, one is communication
wiring (S) and the other is a ground wire. Wiring between 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.
!
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.
Use copper conductors only with a 600 volt insulation
rating wire.
!
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.
CAUTION
CAUTION
4
DIMENSIONS − OUTDOOR
System Size Height (H) in. (mm) Width (W) in. (mm) Depth (D) in. (mm) Weight-Net lbs. (kg)
9K (115) 21.85(555) 30.31(770) 11.81(300) 57.3(26)
Cooling
Only
Heat
Pump
12K (115V) 21.85(555) 30.31(770) 11.81(300) 57.8(26.2)
9K (208/230V) 21.85(555) 30.31(770) 11.81(300) 54.7(24.8)
12K (208/230V) 21.85(555) 30.31(770) 11.81(300) 53.8(24.4)
18K (208/230V) 21.81(554) 31.50(800) 13.11(333) 70.1(31.8)
24K (208/230V) 27.64(702) 33.27(845) 14.29(363) 88.6(40.2)
System Size Height (H) in. (mm) Width (W) in. (mm) Depth (D) in. (mm) Weight-Net lbs. (kg)
9K (115) 21.85(555) 30.31(770) 11.81(300) 61.5(27.9)
12K (115V) 21.85(555) 30.31(770) 11.81(300) 65.0(29.5)
9K (208/230V) 21.85(555) 30.31(770) 11.81(300) 57.1(25.9)
12K (208/230V) 21.85(555) 30.31(770) 11.81(300) 60.6(27.5)
18K (208/230V) 21.81(554) 31.50(800) 13.11(333) 94.6(42.9）
24K (208/230V) 27.64(702) 33.27(845) 14.29(363) 105.2(47.7)
T able 4—Dimensions and Weights
30.66(779) W3
11.81(300) D
H
21.85(555)
0.47(12)
19.17(487) W1
30.31(770) W
2.76(70) W
0.98(25) B1
D3
D2
3.54(90) B2
D1
11.26(286)
13.07(322)
2.36(60)
2.42(61.5) A2
11.73(298)
H1
H2
Unit: inch(mm)
.24(6)
0
R
3.66(93)
0.47(12) A1
Fig. 2 - Sizes 9K and 12K
5
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