Carrier 38MURA User manual

Specifications subject to change without notice.
Fig. 1 —Sizes 18K, 18K HH, 24K, 24K HH, 30K,
30K HH, 36K
Fig. 2 —Sizes 36K HH, 48K, 48K HH, 60K, 60K HH
NOTES: Read the entire instruction manual before starting the
installation. Images are for illustration purposes only.
Actual models may differ slightly. HH Denotes High Heat
Models.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS........................................................2
MODEL NUMBER AND ACCESSORIES.....................................3
DIMENSIONS..................................................................................4
CLEARANCES ................................................................................8
INSTALLATION REQUIREMENTS .............................................9
INSTALLATION .............................................................................9
Step 1 - Check Equipment ................................................................9
Step 2 - Mount Unit ..........................................................................9
Step 3 - Condensate Drain Installation .............................................10
Step 4 - Operating Ambient..............................................................10
Step 5 - Refrigerant Piping Connections ..........................................10
Step 6 - Electrical Connections - Dip Switch Configuration............13
Step 7 - Evacuate Coil And Tubing System .....................................15
ELECTRICAL DATA......................................................................16
24V CONNECTION DIAGRAMS ..................................................16
START-UP .......................................................................................18
CARE AND MAINTENANCE........................................................18
TROUBLESHOOTING ...................................................................18
OUTDOOR UNIT DIAGNOSTIC GUIDES ...................................19
CROSSOVER SOLUTIONS............................................................20
Installation Instruction
38MURA
Residential Single Zone Heat Pump System
Sizes 18 to 60

38MURA: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
2
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.Wear 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 the 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 . 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, WA R N I N G , 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.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or
death.
Before installing, modifying, or servicing system, the 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.
WA R N I N G
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.
WAR NI NG
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.
CAUTION

38MURA: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
3
MODEL NUMBER AND ACCESSORIES
The system is shipped with the following accessories. Use all of the
installation parts and accessories to install the system. Improper
installation may result in water leakage, electrical shock and fire, or cause
the equipment to fail. Keep the installation manual in a safe place and do
not discard any other accessories until the installation work has been
completed.
Table 1 — Accessories
Table 2 — Suction Line and Liquid Line Flare to Braze
Fig. 3 — Outdoor Unit
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.
- Figure 3 is only a sketch. The actual model may differ slightly.
Table 3 lists the units covered in this document.
Table 3 — Unit Sizes
PART
NO. PART NAME QTY.
1 Outdoor unit 1
- Literature package including installation instructions 1
-Mounting pads for the outdoor unit (helps with vibration
prevention during unit operation) 4
-DrainJoint 1
-DrainHose 1
- Flare to Braze Adapter (See Table 2) 2
- Suction Line Reducer (Some models, see Table 2) 1
Model # Suction Line Flare
to Braze Adapter
Liquid Line Flare
to Braze Adapter
Suction Line Flare
to Flare Reducer
38MURAQ18AA3 5/8” flare
to 3/4” braze
3/8” flare
to 3/8” braze
5/8” flare
to 3/4” flare
38MURAQ24AA3 5/8” flare
to 3/4” braze
3/8” flare
to 3/8” braze
5/8” flare
to 3/4” flare
38MURAQ30AA3 3/4” flare
to 3/4” braze
3/8” flare
to 3/8” braze -
38MURAQ36AA3 3/4” flare
to 3/4” braze
3/8” flare
to 3/8” braze -
38MURAQ48AA3 3/4” flare
to 3/4” braze
3/8” flare
to 3/8” braze -
38MURAQ60AA3 7/8” flare
to 7/8” braze
3/8” flare
to 3/8” braze -
38MURAQ18AB3 5/8” flare
to 3/4” braze
3/8” flare to
3/8” braze
5/8” flare
to 3/4” flare
38MURAQ24AB3 3/4” flare
to 3/4” braze
3/8” flare
to 3/8” braze -
38MURAQ30AB3 3/4” flare
to 3/4” braze
3/8” flare
to 3/8” braze -
38MURAQ36AB3 3/4” flare
to 3/4” braze
3/8” flare
to 3/8” braze -
38MURAQ48AB3 3/4” flare
to 3/4” braze
3/8” flare
to 3/8” braze -
38MURAQ60AB3 7/8” flare
to 7/8” braze
3/8” flare
to 3/8” braze -
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CBP
SYSTEM TONS BTUH VOLTAGE -
PHASE OUTDOOR MODEL
1.50 18,000 208/230-1 38MURAQ18AA3
1.50 18,000 208/230-1 38MURAQ18AB3
2.00 24,000 208/230-1 38MURAQ24AA3
2.00 24,000 208/230-1 38MURAQ24AB3
2.50 30,000 208/230-1 38MURAQ30AA3
2.50 30,000 208/230-1 38MURAQ30AB3
3.00 36,000 208/230-1 38MURAQ36AA3
3.00 36,000 208/230-1 38MURAQ36AB3
4.00 48,000 208/230-1 38MURAQ48AA3
4.00 48,000 208/230-1 38MURAQ48AB3
5.00 60,000 208/230-1 38MURAQ60AA3
5.00 60,000 208/230-1 38MURAQ60AB3

38MURA: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
4
DIMENSIONS
Table 4 — Dimensions
Fig. 4 — Size 18K
System
Size
(208/230V) Packaging
Height (H)
in (mm)
Width (W)
in (mm)
Depth (D)
in (mm)
Net Weight
lbs. (kg)
Height (H)
in (mm)
Width (W)
in (mm)
Depth (D)
in (mm)
Net Weight
lbs. (kg)
18K 21.81 (554) 31.69 (805) 12.99 (330) 75.84 (34.4) 24.21 (615) 36.02 (915) 14.57 (370) 81.35 (36.9)
18K High
Heat 26.50 (673) 35.04 (890) 13.29 (338) 102.95 (46.7) 29.13 (740) 39.17 (995) 15.67 (398) 109.79 (49.8)
24K 26.50 (673) 35.04 (890) 13.29 (338) 102.29 (46.4) 29.13 (740) 39.17 (995) 15.67 (398) 109.79 (49.8)
24K High
Heat 31.89 (810) 37.24 (946) 16.02 (407) 136.69 (62) 34.84 (885) 42.91 (1090) 19.69 (500) 145.50 (36)
30K 31.89 (810) 37.24 (946) 16.02 (407) 141.76 (64.3) 34.84 (885) 42.91 (1090) 19.69 (500) 151.46 (68.7)
30K High
Heat 31.89 (810) 37.24 (946) 16.02 (407) 159.83 (72.5) 34.84 (885) 42.91 (1090) 19.69 (500) 169.75 (77)
36K 31.89 (810) 37.24 (946) 16.02 (407) 151.68 (68.8) 34.84 (885) 42.91 (1090) 19.69 (500) 161.16 (73.1)
36K High
Heat 52.48 (1333) 37.48 (952) 16.34 (415)
227.07 (103) 58.27 (1480) 43.11 (1095) 19.49 (495) 255.73 (116)
48K 52.48 (1333) 37.48 (952) 16.34 (415) 217.59 (98.7) 58.27 (1480) 43.11 (1095) 19.49 (495) 248.68 (112.8)
48K High
Heat 52.48 (1333) 37.48 (952) 16.34 (415)
220.24 (99.9) 58.27 (1480) 43.11 (1095) 19.49 (495) 248.90 (112.9)
60K 52.48 (1333) 37.48 (952) 16.34 (415) 217.15 (98.5) 58.27 (1480) 43.11 (1095) 19.49 (495) 248.46 (112.7)
60K High
Heat 52.48 (1333) 37.48 (952) 16.34 (415) 239.86 (108.8) 58.27 (1480) 43.11 (1095) 19.49 (495) 271.61 (123.2)
A
DETAIL
A
SCALE2:1
334.162
13.16
894.715
35.23
663
26.1
890.603
35.06
71.521
2.82
337.562
13.29
73.517
2.89
122.053
4.81
R
6.026
0.24
11
0.43
672.787
26.49
379.586
14.94
346.674
13.65
106.051
4.18

38MURA: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
5
DIMENSIONS (CONT)
Fig. 5 — Sizes 18K HH / 24K
4.18 [106.051]
4.81
[122.053]
26.49 [672.787]
0.43 [11]
13.29
[337.562] DETAIL A
SCALE 2:1
2.89
[73.517]
R 0.24
[6.026]
35.23
[894.71
26.1
[663]
35.06
[890.603]
2.82
[71.521]
14.94 [379.58
13.16 [334.16
13.65
[346.67

38MURA: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
6
DIMENSIONS (CONT)
Fig. 6 — Sizes 24K HH / 30K / 30K HH / 36K

38MURA: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
7
DIMENSIONS (CONT)
Fig. 7 — Sizes 36K HH / 48K / 48K HH / 60K / 60K HH
41(1045) W1
37.5(952) W
15.9(404) B
17.6(448) C
52.5(1333) H
16.3(415) D
25(634) A
2
.9(74)
27.9(708)
38.4(976)

38MURA: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
8
CLEARANCES
Fig. 8 — Clearances
Table 5 — Clearance Dimensions
NOTE: The outdoor unit must be mounted at least 2in (50mm) above the maximum anticipated snow depth.
Fig. 9 —Clearances for multiple units
UNIT MINIMUM VALUE
IN. (MM)
A 24 (610)
B 24 (610)
C 24 (610)
D 4 (101)
E 4 (101)
DB
AE
C
Air inlet
Air outlet
59in (150cm)
or more on a
multiple parallel
unit arrangement
24in (61cm) or more on a single parallel unit arrangement
59in (150cm)
or more when
facing each other
Blowing into the air-inlet of other
condenser shall be avoided.
24in (60cm)
or more
19in (48cm) or more on
a multiple parallel unit
arrangement 4in (10cm)
or more on a single
parallel unit arrangement
9.8in (25cm) or more for proper airflow
24in (61cm) or more is recommended
for service
59in (150cm)
or more when
facing each other
Blowing into the air-inlet of other
condenser shall be avoided.
59in (150cm)
or more

38MURA: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
9
INSTALLATION REQUIREMENTS
• A location which is convenient to installation and not exposed to
strong winds.
• A location which can bear the weight of the outdoor unit and where
the outdoor unit can be mounted in a level position.
• A location which provides appropriate clearances (see Fig. 8).
• Allow sufficient space for airflow and service of the unit. See Fig. 8
for the required minimum distances between the unit or walls.
NOTE: DO NOT install the indoor or outdoor units in a location with
special environmental conditions.
INSTALLATION
Step 1 - Check Equipment
Unpack the unit and move to the final location. Remove the carton, taking
care not to damage the unit. Inspect the equipment for damage prior to
installation. File a claim with the shipping company if the shipment is
damaged or incomplete.
Locate the unit rating plate which contains the proper installation
information. Check the rating plate to ensure the unit matches the job
specifications.
Step 2 - Mount Unit
1. Select the installation location of the outdoor unit following the
installation requirements. To prevent high wind exposure, install the
outdoor unit with the air inlet side facing the wall (see fig 10).
Fig. 10 — High Wind Installation
2. Use a rigid base to support the unit in a level position. If conditions or
local codes require the unit be attached to a pad, tie down bolts should
be used and fastened through knockouts provided in unit base pan. For
hurricane tie downs, contact distributor for details and PE (Professional
Engineer) Certification, if required.
PRODUCT INSTALLATION
• Installation must be performed by an authorized dealer or
specialist. A defective installation can cause water leakage,
electrical shock, or fire.
• The installation must be performed according to the installation
instructions. Improper installation can cause water leakage,
electrical shock, or fire. (In North America, installation must be
performed in accordance with the requirements of NEC or CEC
by authorized personnel only.)
• Contact an authorized service technician for repair or
maintenance of this unit. This appliance must be installed in
accordance with local codes.
• Only use the included accessories, parts, and specified parts for
installation. Using non-standard parts can cause water leakage,
electrical shock, fire, or unit failure.
• To prevent exposure to wind, install the outdoor unit with its air
inlet side facing the wall
• Install drainage piping according to the instructions in this
manual. Improper drainage may cause water damage to your
home and property.
•DO NOT install the unit in a location that may be exposed to
combustible gas leaks. If combustible gas accumulates around
the unit, it may cause a fire.
•DO NOT turn on the power until all work has been completed.
• When moving or relocating the system, consult experienced
service technicians for the disconnection and re-installation of
the unit.
WA R N I N G
Strong
wind
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or
improper operation.
In regions with snowfall and cold temperatures, avoid installing
the outdoor unit in areas where it can be covered by snow.
Blocking the air intake may result in reduced airflow, significantly
reduced performance and damage to the equipment.
CAUTION

38MURA: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
10
Step 3 - Condensate Drain Installation
NOTE: Install drains must meet local sanitation codes.
Install the outdoor unit drain joint
Fit the seal into the drain joint, then insert the drain joint into the base pan
hole of the outdoor unit. Rotate 90° to securely assemble them. Connect
the drain joint with an extension drain hose to avoid condensate from
draining off the outdoor unit during the heating mode.
Fig. 11 — Drain Joint
NOTE: Images are for illustration purposes only.
NOTE: Basepan built-in with multiple holes for proper draining
during defrost. For applications where it is required to seal
these holes, and re-direct the condensate drain, rubber plugs
are available through RCD.
Table 6 — Base Pan Rubber Plugs
Step 4 - Operating Ambient
Step 5 - Refrigerant Piping Connections
Table 7 — Piping and Refrigerant
Base pan hole of
outdoor unit
Drain fitting
Seal
Seal
OUTDOOR UNIT MODEL
NUMBER
PER UNIT
BASE PAN RUBBER PLUGS
RCD PART NUMBER
38MURAQ18AA3
38MURAQ18AB3
38MURAQ24AA3
38MURAQ24AB3
38MURAQ30AA3
38MURAQ30AB3
38MURAQ36AA3
38MURAQ36AB3
38MURAQ48AA3
38MURAQ48AB3
38MURAQ60AA3
38MURAQ60AB3
12600801A00077
EQUIPMENT DAMAGE HAZARD
In cold climates, ensure the drain hose is as vertical as possible to
ensure swift water drainage. If water drains too slowly, it can freeze
in the hose and flood the unit.
CAUTION
OPERATING RANGE AND HUMIDITY HIGH HEAT
MODELS
REGULAR
MODELS
Operating Range
Cooling Outdoor
Min - Max DB
°F -22~130 5~130
°C -30~55 -15~55
Heating Outdoor
Min - Max DB
°F -22~86 -5~86
°C -30~30 -15~30
Operating Humidity % 0~80 0~80
System Size 18K 18K High
Heat 24K 24K High Heat 30K 30K High Heat 36K 36K High Heat 48K 48K High Heat 60K 60K High Heat
(208/230 V)
Min. Piping Length ft.(m) 9.8 (3)
Standard Piping Length ft.(m) 24.6 (7.5)
Max. outdoor-indoor
height difference
(OU higher than IU)
ft.(m) 65.6 (20) 65.6 (20) 82 (25) 82 (25) 82 (25) 82 (25) 98.4 (30) 98.4 (30) 98.4 (30) 98.4 (30) 98.4 (30) 98.4 (30)
Max. outdoor-indoor
height difference
(IU higher than OU)
ft.(m) 65.6 (20) 65.6 (20) 82 (25) 82 (25) 82 (25) 82 (25) 98.4 (30) 98.4 (30) 98.4 (30) 98.4 (30) 98.4 (30) 98.4 (30)
Suction Pipe
(size - connection type) in (mm) ø3/4” (19) ø3/4” (19) ø3/4” (19) ø3/4” (19) ø3/4” (19) ø3/4” (19) ø3/4” (19) ø3/4” (19) ø3/4” (19) ø3/4” (19) ø7/8” (22) ø7/8” (22)
Liquid Pipe (
size-connection) in (mm) ø3/8” (9.52)
Refrigerant Type Type R410A
Charge Amount lb. (kg) 3.53 (1.6) 5.07 (2.3) 4.63 (2.1) 6.39 (2.9) 6.72 (3.05) 8.38 (3.8) 8.16 (3.7) 10.36 (4.7) 10.4 (4.7) 10.58 (4.8) 10.8 (4.9) 10.58 (4.8)
Total Maximum Piping
Length per system ft. (m 98.4(30) 98.4(30) 164 (50) 164 (50) 164 (50) 164 (50) 213 (65) 213 (65) 213 (65) 213 (65) 213 (65) 213 (65)