Carrier 38MHRBQ12AA3 Specifications
38MHRB
Outdoor Unit Single Zone Ductless System
Sizes 09 to 24
Product Data
INDUSTRY LEADING
FEATURES / BENEFITS
A PERFECT BALANCE BETWEEN
BUDGET LIMITS, ENERGY SAVINGS AND
COMFORT.
The 38MHRB series ductless systems are a matched combination
of an outdoor condensing unit and an indoor fan coil unit
connected only by refrigerant tubing and wires.
The ductless system permits creative solutions to design problems
such as:
NOTE: Images are for illustration purposes only. Actual models
may differ slightly.
TABLE OF CONTENTS
PAGE
MODEL NUMBER NOMENCLATURE 3.................
STANDARD FEATURES AND ACCESSORIES 4...........
DIMENSIONS − OUTDOOR 5..........................
CLEARANCES − OUTDOOR 8.........................
SPECIFICATIONS − OUTDOOR COOLING ONLY 9........
COMPATIBILITY 9...................................
PERFORMANCE 9...................................
SPECIFICATIONS − OUTDOOR HEAT PUMP 10..........
COMPATIBILITY 10..................................
PERFORMANCE 10..................................
COOLING PERFORMANCE DATA − (COOLING ONLY) 11..
COOLING PERFORMANCE DATA − (HEAT PUMP) 12.....
HEATING PERFORMANCE DATA − (HEAT PUMP) 13......
APPLICATION DATA 14...............................
WIRING 15..........................................
AIR FLOW DATA 16..................................
SOUND DATA 16.....................................
SOUND PRESSURE IN OCTAVE BANDS 16..............
ELECTRICAL DATA 17...............................
FAN AND MOTOR SPECIFICATIONS 18.................
WIRING DIAGRAMS 19...............................
GUIDE SPECIFICATIONS 25...........................
S Add−ons to current space (an office or family room
addition)
S Special space requirements
S When changes in the load cannot be handled by the
existing system
S When adding air conditioning to spaces that are heated
by hydronic or electric heat and have no ductwork
S Historical renovations or any application where
preserving the look of the original structure is essential.
The ideal compliment to your ducted system when it is impractical
or prohibitively expensive to use ductwork.
The compact indoor fan coil units take up very little space in the
room and do not obstruct windows. The fan coils are attractively
styled to blend with most room decors. Advanced system
components incorporate innovative technology to provide reliable
cooling performance at low sound levels.
Inverter Technology
The inverter driven compressor is designed to run at various input
power frequencies (Hz) which controls the compressor’s motor
speed.
Even Temperature – The control package, including the inverter,
monitors the outdoor and indoor temperatures as they relate to the
selected indoor set point and adjusts the compressor speed to match
the load and keep the system operating continuously rather than
cycling and creating temperature swings. This translates to higher
comfort levels for the occupants.
Rapid Pull Down/Warm−Up – Comfort is increased by the
inverter system’s ability to ramp up the compressor speed enabling
the system to reach the user selected room temperature set point
quicker.
Humidity Control – Running the system for longer periods and
continuously varying the compressor speed enhances the humidity
control.
Individual Room Comfort
Maximum comfort is provided because each space can be
controlled individually based on the usage pattern.
Low Sound Levels
When noise is a concern, ductless systems are the answer. The
indoor units are whisper quiet. There are no compressors indoors,
either in the conditioned space or directly over it, and there is none
of the noise usually generated by air being forced through the
ductwork.
When sound ordinances and proximity to neighbors demand quiet
operation, this outdoor unit is the right choice. With the inverter
technology, these units run at lower speeds most of the time
resulting in reduced sound levels.
Inverter Technology – Enhanced Economical Operation
Ductless systems are inherently economical to operate. Individual
rooms are heated or cooled only when required, and since the air is
delivered directly to the space, there is no need to use additional
energy to move the air in the ductwork. This economical operation
is enhanced further when the inverter system output matches the
load resulting in a more efficient system.
Easy−To−Use Controls
The systems have microprocessor−based controls to provide the
ultimate in comfort and efficiency. The user friendly wired and
wireless remote controls provide the interface between the user and
the unit.
Secure Operation
If security is an issue, outdoor and indoor units are connected only
by refrigerant piping and wiring to prevent intruders from crawling
through ductwork or wall openings. In addition, since the outdoor
unit can be installed close to an outside wall, coils are protected
from vandals and severe weather.
Fast Installation
This compact ductless system is simple to install. Only wires and
piping need to run between the indoor and outdoor units. These
units are fast and easy to install ensuring minimal disruption to
customers in homes or the workplace. This makes these systems
the equipment of choice for retrofit applications.
Simple Servicing and Maintenance
Removing the top panel of the outdoor unit provides immediate
access to the control compartment, providing the service technician
access to the diagnostic LEDs to facilitate the troubleshooting
process. In addition, the draw−thru design of the outdoor unit
means that dirt accumulates on the outside surface of the coil. Coils
can be cleaned quickly from the inside using a pressure hose and
detergent.
On the indoor units, service and maintenance expense is reduced
due to the permanent easy to clean filters. Also, error codes are
displayed on the front panel to alert the user to certain system
malfunctions
Built−in Reliability
Ductless system indoor and outdoor units are designed to provide
years of trouble−free operation.
Both the indoor and outdoor units are well protected. Whenever
the microprocessor detects abnormal conditions, the unit stops and
an error code appears.
Inverter systems provide additional reliability due to the soft start.
This refers to the ability of the inverter to start the compressor
motor using reduced voltage and reduced current. This feature is
beneficial from an electrical standpoint (eliminates current spikes)
as well as an overall reliability standpoint due to reduced stress on
all associated system components.
Agency Listings
All systems are listed with AHRI (Air conditioning, Heating, and
Refrigeration Institute) and are ETL certified per UL 1995
standard.
2
MODEL NUMBER NOMENCLATURE
OUTDOOR UNIT
38 MH 3Q
38 = OUTDOOR UNIT
BR09
A
A
VOLTAGE
1 =115-1-60
3 = 208/230-1-60
MH = MODEL
UNIT TYPE
R = OUTDOOR UNIT
MAJOR SERIES
SYSTEM TYPE
C = COOLING ONLY
Q = HEAT PUMP
Use of the AHRI Certified
TM Mark indicates a
manufacturer’s
participation in the
program For verification
of certification for individual
products, go to
www.ahridirectory.org.
VARIATIONS
A = STANDARD
MAXIMUM NUMBER OF FAN COIL UNITS THAT
CAN BE CONNECTED TO THE OUTDOOR UNIT
A = 1:1
NOMINAL CAPACITY
09 - 3/4 TON
12 - 1 TON
18 - 1-1/2 TONS
24 - 2 TONS
3
STANDARD FEATURES AND ACCESSORIES
Ease Of Installation
Low Voltage Controls S
Comfort Features
Microprocessor Controls S
Auto Restart Function S
Auto Changeover S
Energy Saving Features
Inverter Driven Compressor S
46°F Heating Mode (Heating Setback)
Safety And Reliability
3 Minute Time Delay For Compressor S
High Compressor Discharge Temperature S
Low Voltage Protection S
Compressor Overload Protection S
Compressor Over Current Protection S
IPM Module Protection S
Condenser High Temp Protection in Cooling Mode S
Aluminum Golden Hydrophilic pre-coated fins S
Ease Of Service And Maintenance
Diagnostics S
Liquid Line Pressure Taps S
Application Flexibility
Crankcase Heater S
Base pan Heater on Heat Pump units Only S
Legend
S Standard
A Accessory
S
OUTDOOR UNITS
Crankcase Heater
The crankcase heater is standard on all unit sizes. Heater clamps
must be placed around the compressor oil stump.
Base pan Heater
The base pan heater is standard on all heat pump unit sizes.
ACCESSORIES
Outdoor Unit
Model Number
38MHRBC12AA1
38MHRBC18AA3
38MHRBC24AA3 25
38MHRBQ12AA1
38MHRBQ12AA3
38MHRBQ18AA3 13
38MHRBQ24AA3 25
NOTE: The basepan is constructed with multiple holes to provide
proper draining during defrost. For applications where is required
to seal these holes, and re−direct the condensate drain, rubber plugs
are available through RCD.
Basepan Base
Rubber Plugs
RCD Part Number
12600801A00077
Quantity per Unit
1238MHRBC12AA3
1238MHRBQ09AA3
4
DIMENSIONS − OUTDOOR
System Size Height (H) in. (mm) Width (W) in. (mm) Depth (D) in. (mm) Weight-Net lbs. (kg)
Cooling
Only
Heat
Pump
12K (115V) 21.85(555) 30.31(770) 11.81(300) 57.8(26.2)
12K (208/230V) 21.85(555) 30.31(770) 11.81(300) 53.8(24.4)
18K (208/230V) 21.85 (555) 30.31 (770) 11.81 (300) 65.9 (29.9)
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)
12K (115V) 21.85(555) 30.31(770) 11.81(300) 69(31.3)
9K (208/230V) 21.85(555) 30.31(770) 11.81(300) 63(28.6)
12K (208/230V) 21.85(555) 30.31(770) 11.81(300) 65.5(29.7)
18K (208/230V) 21.81(554) 31.50(800) 13.11(333) 79.6(36.1)
24K (208/230V) 27.64(702) 33.27(845) 14.29(363) 114.2(51.8)
H
21.85(555)
30.66(779) W3
11.81(300) D
0.47(12)
19.17(487) W1
30.31(770) W
0.98(25) B1
D3
D2
11.26(286)
13.07(322)
2.36(60)
3.54(90) B2
2.42(61.5) A2
H1
H2
.24(6)
0
R
3.66(93)
0.47(12) A1
Unit: inch(mm)
Fig. 1 – Sizes 9K and 12K Heat Pump and Size 18K Cooling Only
2.76(70) W
D1
11.73(298)
5
DIMENSIONS − OUTDOOR (CONT)
H
21.81 (554)
0.47 (1 2)
13.11
D
(333)
20.24 (514)
31.50 (800)
B2
4.17 (1 06)
D3
D2
12.80 (325)
H1
2.36 (6 0)
H2
3.37 (8 5.5)
12.24 (311)
R
0
.
7
9
(R
2
0
)
0.87 (2 2)
A1
2.43 (6 1.6)
A2
W
W1
2.43 (6 1.8)
B1
4
2
.
0
R
)
6
R
(
Unit: inch(mm)
2.76 (7 0)
W2
D1
13.39 (340)
Fig. 2 – Size 18K Heat Pump
6
DIMENSIONS − OUTDOOR (CONT)
Fig. 3 – Size 24K
7
Unit: inch (mm)
CLEARANCES − OUTDOOR
A
D
B
C
Air-outlet
Fig. 4 – Outdoor Unit Clearance
UNIT MINIMUM VALUE in. (mm)
A 24 (610)
B 24 (610)
C 24 (610)
D 4 (101)
E 4 (101)
NOTE: The outdoor unit must be mounted at least 2in. (50mm) above the maximum anticipated snow depth.
Air-inlet
E
9.8in (25cm)
or more for
proper airow
24in (61cm) or
more is
recommended
for service
9.8in (25cm)
or more for proper airow
24in (61cm)
or more is
recommended
for service
59in (150cm)
or more on a
multiple parallel
unit arrangement
24in (61cm) or more
on a single parallel
unit arrangement
24in (60cm)
or more
Fig. 5 – Clearances for multiple units
8
19in (48cm) or more
on a multiple parallel
unit arrangement
4in (10cm) or more on
a single parallel unit
arrangement
118in (300cm) or more
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