Carrier 38MHRBC12AA1 User manual

Installation Instructions
38MHRB
Outdoor Unit Single Zone Ductless System
Sizes 09 to 24
NOTE: Images are for illustration purposes only. Actual models
may differ slightly.
NOTE: Read the entire instruction manual before starting the
installation.
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..............

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 literature and attached to the unit. Consult
local building codes and National Electrical Code (NEC) for
specialrequirements. 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.
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.
!WARNING
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
compressorat start−up.

3
PARTS LIST
Table 1—Parts List
PART NO. PART NAME QTY.
1Outdoor 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
A150766
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
Cooling Only
SYSTEM TONS BTUh VOLTAGE - PHASE OUTDOOR MODEL
1.00 12,000 115-1 38MHRBC12AA1
1.00 12,000 208/230-1 38MHRBC12AA3
1.50 18,000 208/230-1 38MHRBC18AA3
2.00 24,000 208/230-1 38MHRBC24AA3
Heat Pump
1.00 12,000 115-1 38MHRBQ12AA1
0.75 9,000 208/230-1 38MHRBQ09AA3
1.00 12,000 208/230-1 38MHRBQ12AA3
1.50 18,000 208/230-1 38MHRBQ18AA3
2.00 24,000 208/230-1 38MHRBQ24AA3

4
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.
STable 3 contains piping information for the product covered within this document.
Table 3—Piping and Refrigerant Information
System Size 12K (115V) 9K (208-230V) 12K (208-230V) 18K (208-230V) 24K (208-230V)
Piping
Min. Piping Length ft. (m) 10(3) 10(3) 10(3) 10(3) 10(3)
Standard Piping Length ft. (m) 25(7.5) 25(7.5) 25(7.5) 25(7.5) 25(7.5)
Max. outdoor-indoor
height difference
(OU higher than IU)
ft. (m) 33(10) 33(10) 33(10) 66(20) 66(20)
Max. outdoor-indoor
height difference
(IU higher than OU)
ft. (m) 33(10) 33(10) 33(10) 66(20) 66(20)
Max. Piping Length with
no additional refrigerant
charge per System
(Standard Piping length)
ft. (m) 25(7.5) 25(7.5) 25(7.5) 25(7.5) 25(7.5)
Total Max. Piping
Length per system ft. (m) 82(25) 82(25) 82(25) 98(30) 164(50)
Additional refrigerant
charge (between Standard
– Max piping length)
Oz/ft (g/m) 0.161(15) 0.161(15) 0.161(15) 0.161(15) 0.322(30)
Suction Pipe
(size - connection type) In (mm) 1/2(12.7) 3/8(9.52) 1/2(12.7) 1/2(12.7) 5/8(15.9)
Liquid Pipe
(size - connection type) In (mm) 1/4(6.35) 1/4(6.35) 1/4(6.35) 1/4(6.35) 3/8(9.52)
Refrigerant Type Type R410A R410A R410A R410A R410A
Refrigerant
Cooling Only Models
Charge Amount Lbs (kg) 1.30(0.59) N/A 1.17 (0.53) 1.98 (0.9) 2.56 (1.16)
Heat Pump Models
Charge Amount Lbs (kg) 2.12(0.96) 1.76(0.8) 2.12(0.96) 2.82 (1.28) 3.97 (1.8)
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.
RecommendedConnection 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.
CAUTION
!
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.

5
DIMENSIONS − OUTDOOR Table 4—Dimensions and Weights
Cooling
Only
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) 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)
Heat
Pump
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)
19.17(487) W1
2.76(70) W
11.73(298)
21.85(555)
11.81(300) D
H
0.47(12)
2.36(60)
3.66(93)
H1
H2
D1
30.31(770) W
30.66(779) W3
13.07(322)
D2
0.98(25) B1
3.54(90) B2
2.42(61.5) A2
0.47(12) A1
R0.24(6)
11.26(286)
D3
Unit: inch(mm)
Fig. 2 - Sizes 9K and 12K Heat Pump and Size 18K Cooling Only

6
DIMENSIONS − OUTDOOR (CONT)
31.50 (800)
20.24 (514)
21.81 (554)
2.36 (6 0)
3.37 (8 5.5)
13.39 (340)
0.47 (1 2)
12.24 (311)
12.80 (325)
13.11 (333)
2.76 (7 0)
H
H1
H2
D1
D2 D3
2.43 (6 1.8)
4.17 (1 06)
0.87 (2 2)
R0.79(R 20)
R0.24(R6)
2.43 (6 1.6)
D
W
W1
W2
B1
B2
A2
A1
Unit: inch(mm)
Fig. 3 - Size 18K Heat Pump

7
DIMENSIONS − OUTDOOR (CONT)
Unit: inch (mm)
Fig. 4 - Size 24K

8
CLEARANCES − OUTDOOR
A
DB
Air-outlet
Air-inlet
C
E
Fig. 5 - Outdoor Unit Clearance
Table 5—Outdoor Unit Clearance Dimensions
UNIT MINIMUM VALUE in. (mm)
A24 (610)
B24 (610)
C24 (610)
D4 (101)
E4 (101)
NOTE: The outdoor unit must be mounted at least 2in. (50mm) above the maximum anticipated snow depth.
118in (300cm) or more
19in (48cm) or more
on a multiple parallel
unit arrangement
4in (10cm) or more on
a single parallel unit
arrangement
24in (60cm)
or more
59in (150cm)
or more on a
multiple parallel
unit arrangement
24in (61cm) or more
on a single parallel
unit arrangement
9.8in (25cm)
or more for
proper airow
24in (61cm) or
more is
recommended
for service
9.8in (25cm)
or more for proper airow
24in (61cm)
or more is
recommended
for service
Fig. 6 - Clearancesfor multiple units

9
INSTALLATION TIPS
Ideal installation locations include:
Outdoor Unit
SA location which is convenient to installation and not exposed to
strong winds.
SA location which can bear the weight of the outdoor unit and
where the outdoor unit can be mounted in a level position.
SA location which provides appropriate clearances (see Fig. 5).
SDo not install the indoor or outdoor units in a location with
special environmental conditions. For those applications, contact
your Ductless representative.
OUTDOOR UNIT INSTALLATION
1. Use a rigid base to support the unit in a level position.
2. Locate the outdoor unit and connect piping and wiring.
CAUTION
!
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. If the outdoor unit is installed in areas where heavy
snow is expected, a field supplied ice or snow stand and/or
field supplied−installed wind baffle should be installed to
protect the unit from snow accumulation and/or blocked air
intake. Blocking the air intake may result in reduced airflow,
significantly reduced performance and damage to the
equipment.
NOTE: Install the outdoor unit on a rigid base to reduce noise
levels and vibration. Determine the optimal air outlet direction to
prevent discharged air from being blocked. If the installation site
is exposed to strong winds such as a coastal areas, ensure the fan’s
proper operation by installing the unit lengthwise along the wall
or use dust or shield plates. If the unit needs to be suspended, the
installation bracket should comply with the suspension
requirements in the installation bracket diagram. The installation
wall should be solid brick, concrete or the same intensity
construction, or take steps to reinforce and dampen the support.
The connection between the bracket and the wall as well as the
bracket and the air conditioner should be firm, stable and reliable.
Ensure there is no obstacle which may block the radiating air.
Strong
wind
Fig. 7 - High Wind Installation
MAKE REFRIGERANT PIPING CONNECTIONS
(OUTDOOR UNIT)
IMPORTANT: Use refrigeration grade tubing ONLY. No other
type of tubing may be used. Use of other types of tubing will
void the manufacturer’s warranty.
Do not open the service valves or remove the protective caps from
the tubing ends until all connections are made.
Bend the tubing with bending tools to avoid kinks and flat spots.
Keep the tubing free of dirt, sand, moisture, and other
contaminants to avoid damaging the refrigerant system.
Avoid sags in the suction line to prevent the formation of oil traps.
Insulate each tube with a minimum 3/8−in. (10 mm) wall thermal pipe
insulation. Inserting the tubing into the insulation before making the
connections will save time and improve installation quality.
1. Remove the service valve cover, if provided with the unit.
2. Cut the pipe, with a pipe cutter, at 90 degrees (see Fig. 8).
3. Remove the service connection, if provided with the unit.
Oblique
DŽ
90 Roughness
Burr
Fig. 8 - Cut the Pipe
4. Remove all the burrs from the cut cross section of the pipe
avoiding any burrs inside the tubes.
5. Remove the flare nuts attached to the indoor and outdoor
units.
6. Install the correct size flare nut onto the tubing and make a
flareconnection. Refer to Table 6 for the flare nut spaces.
Table 6—Flare Nut Spacing
OUTER DIAM. (mm) A (mm)
Max. Min.
Ø1/4”(6.35) 0.05 (1.3) 0.03(0.7)
Ø3/8”(9.52) 0.06 (1.6) 0.04(1.0)
Ø1/2”(12.7) 0.07 (1.8) 0.04(1.0)
Ø5/8”(15.88) 0.09 (2.2) 0.08(2.0)
Bar
Copper pipe
Clamp handle Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Fig. 9 - Flare Nut Spacing
7. Apply a small amount of refrigerant oil to the flare
connection on the tubing.
8. Align the center of the pipes and/or service valve.
Indoor unit tubing Flare nut Piping
Fig. 10 - Align Pipe Center
9. Connect both the liquid and gas piping to the indoor unit.
10. Tighten the flare nut using a torque wrench as specified in
Table 7.
11. Complete the installation.
Table 7—Tightening Torque
PIPE DIAMETER In.(mm) TIGHTENING TORQUE
Ft-lb N-m
Ø1/4” (6.35) 10 to 13 13.6 to 17.6
Ø3/8” (9.52) 24 to 31 32.5 to 42.0
Ø1/2” (12.7) 37 to 46 50.1 to 62.3
Ø5/8” (15.88) 50 to 60 67.7 to 81.3
Flare nut
Copper tube
Fig. 11 - Tighten the Flare Nut

10
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Excessive torque can break the flare nut depending on
installationconditions.
INSTALL ALL POWER AND INTERCONNECTING
WIRING TO OUTDOOR UNITS
1. Mount the outdoor power disconnect.
2. Run the power wiring from the main box to disconnect per
NEC and local codes.
3. Remove the field wiring cover from the unit by loosening
the screws.
4. Remove the caps on the conduit panel.
5. Connect the conduit to conduit panel (see Fig. 12).
6. Properly connect both the power supply and control lines
to the terminal block per the connection diagram for the
appropriate unit capacity and voltage.
7. Ground the unit in accordance with NEC and local electrical
codes.
8. Use the lock nuts to secure the conduit.
9. Reinstall the field wiring cover.
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
SBe sure to comply with local codes while running wire
from indoor unit to outdoor unit.
SEvery wire must be connected firmly. Loose wiring may
cause the terminal to overheat or result in unit
malfunction. A fire hazard may also exist. Therefore,
ensure all wiring is tightly connected.
SNo wire should be allowed to touch the refrigerant
tubing, compressor or any moving parts.
SDisconnecting means must be provided and shall be
located within sight and readily accessible from the air
conditioner.
SConnecting cable with the conduit shall be routed
through hole in the conduit panel.
Over 1.57" (40mm)
Terminal Block
Conduit panel
Conduit
Outdoor unit
A07455
Fig. 12 - Field Wiring
DRAIN CONNECTIONS
Install drains must meet local sanitation codes.
Installthe 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 heating
mode.
Seal Base pan hole Drain joint
Seal
Base pan Drain
joint
Fig. 13 - Drain Joint
Images are for illustration purposes only.
CAUTION
!
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.
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
availablethrough RCD.
Table 8—Rubber Plugs
Outdoor Unit
Model Number
Basepan Base
Rubber Plugs
RCD Part Number
Quantity per unit
38MHRBC12AA1
12600801A00077
1238MHRBC12AA3
38MHRBC18AA3
38MHRBC24AA3 25
38MHRBQ12AA1
1238MHRBQ09AA3
38MHRBQ12AA3
38MHRBQ18AA3 13
38MHRBQ24AA3 25

11
ELECTRICAL DATA
Table 9—Electrical Data (Cooling Only)
Cooling Only
Outdoor Unit Size 12K 12K 18K 24K
Volts-PH-Hz (115V) (208/230V) (208/230V) (208/230V)
Max – Min*
Oper. Voltage 127-104 253-187 253-187 253-187
Power Supply MCA 13 11 15 18
MOCP 20 15 20 25
Compressor RLA 9.5 6.8 9 12
Outdoor Fan Motor
FLA 0.6 0.5 0.6 0.6
Rated HP 0.054 0.054 0.054 0.068
Output 40 40 40 50
Table 10—Electrical Data (Heat Pump)
Heat Pump
Outdoor Unit Size 12K 9K 12K 18K 24K
Volts-PH-Hz (115V) (208/230V) (208/230V) (208/230V) (208/230V)
Max – Min*
Oper. Voltage 127-104 253-187 253-187 253-187 253-187
Power Supply MCA 13 8 10 15 18
MOCP 20 15 15 20 25
Compressor RLA 10.5 5.5 6.8 10.5 12
Outdoor Fan Motor
FLA 0.6 0.4 0.4 0.5 0.6
Rated HP 0.054 0.054 0.054 0.054 0.068
Output 40 40 40 40 50
*Permissible limits of the voltage range at which the unit will operate satisfactorily.
LEGEND
FLA - Full Load Amps
MCA - Minimum Circuit Amps
MOCP - Maximum Over-Current Protection
RLA - Rated Load Amps
CONNECTION DIAGRAMS
S
LN
115-1-60
Main
Power Supply
115-1-60
LNSLN
Power to
Indoor Unit
CONNECTING CABLE
OUTDOOR TO INDOOR
GND
Ground
Indoor
Signal
High
Voltage
115-1-60
115-1-60
FIELD POWER SUPPLY
GND
Indoor
Signal
High
Voltage
Indoor Unit
Power Supply
S
L1 L2
208/230-1-60
Main
Power Supply
L1 L2 SL1 L2
CONNECTING CABLE
OUTDOOR TO INDOOR
Indoor Unit
Power Supply
208/230-1-60
Indoor
Signal
High
Voltage
GND
Ground
Power to
Indoor Unit
Indoor
Signal
High
Voltage
208/230-1-60
FIELD POWER SUPPLY
GND
208/230-1-60
115V Indoor Unit 115V Outdoor Unit 230V Indoor Unit 230V Outdoor Unit
Fig. 14 - Connection Diagrams
Notes:
1. Do not use the thermostat wire for any connection between indoor and outdoor units.
2. All connections between indoor and outdoor units must be as shown. The connections are sensitive to polarity and will result in a fault code.

12
SYSTEM VACUUM AND CHARGE
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Never use the system compressor as a vacuum pump.
CAUTION
!
Refrigeranttubes and the indoor coil should be evacuated using the
recommended 500 microns deep vacuum method. The alternate
triple evacuation method may be used if the procedure outlined
below is followed.
NOTE: Always break a vacuum with dry nitrogen.
Using Vacuum Pump
1. Completely tighten flare nuts A, B, C, D, connect the
manifold gage charge hose to a charge port of the low side
servicevalve (see Fig. 15).
2. Connect the charge hose to vacuum pump.
3. Fully open the low side of manifold gage (see Fig. 16).
4. Start the vacuum pump.
5. Evacuate using either the deep vacuum or triple evacuation
method.
6. After evacuation is complete, fully close the low side of
manifold gage and stop the vacuum pump operation.
7. The factory charge contained in the outdoor unit is good for
up to 25 ft. (8 m) of line length. For refrigerant lines longer
than 25 ft. (8 m), add refrigerant, up to the allowable length,
as specified in the System Requirements section.
8. Disconnect the charge hose from the charge connection of
the low side service valve.
9. Fully open service valves B and A.
10. Securely tighten the service valve caps.
Outdoor Unit Indoor Uni
t
Refrigerant
Service Valve
Low Side
High Side
A
B
C
D
A07360
Fig. 15 - Service Valve
Manifold Gage
500 microns
Low side valve High side valve
Charge hose
Charge hose
Vacuum pump
Low side valve
A07361
Fig. 16 - Manifold
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of pulling
a vacuum of 500 microns and a vacuum gage capable of accurately
measuring this vacuum depth. The deep vacuum method is the best
way to assure a system is free of air and liquid water (see Fig. 17).
500
MINUTES
01234567
1000
1500
LEAK IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
2000
MICRONS
2500
3000
3500
4000
4500
5000
A95424
Fig. 17 - Deep Vacuum Graph
Triple Evacuation Method
The triple evacuation is the recommended method of dehydration.
Refer to Fig. 18 and proceed as follows:
1. Pump the system down to 1500 microns and allow the
pump to continue operating for an additional 15 minutes.
2. Close the service valves and shut off the vacuum pump.
3. Connect a dry nitrogen cylinder and regulator to the system
and break vacuum until the system reaches 2 psig.
4. Close the service valve and allow the system to stand for 1
hr. During this time, the dry nitrogen can diffuse throughout
the system absorbing moisture.
5. Pump the system down to 1000 microns.
6. Break the vacuum with dry nitrogen (2 psig).
7. Pump the system down to 500 microns.
8. Perform the hold test for 30 minutes.
CHECK FOR TIGHT, DRY SYSTEM
(IF IT HOLDS DEEP VACUUM)
EVACUATE TO 1500 MICRONS
EVACUATE TO 500 MICRONS MINIMUM (HOLD FOR 30 MINUTES)
RELEASE CHARGE INTO SYSTEM BY OPENING VALVES COMPLETELY
BREAK VACUUM WITH DRY NITROGEN TO 2 PSIG
EVACUATE TO 1000 MICRONS
BREAK VACUUM WITH DRY NITROGEN TO 2 PSIG
Fig. 18 - Triple Evacuation Method
Final Tubing Check
IMPORTANT: Check to be certain factory tubing on both the
indoor and outdoor unit has not shifted during shipment. Ensure
tubes are not rubbing against each other or any sheet metal. Pay
close attention to the feeder tubes, making sure wire ties on feeder
tubes are secure and tight.

13
START−UP
Test Operation
Perform a test operation after completing a gas leak and electrical
safety check. See the indoor unit installation instructions and
owner’s manual for additional start up information.
SYSTEM CHECKS
1. Conceal the tubing where possible.
2. Make sure that the drain tube slopes downward along its
entire length.
3. Ensure all tubing and connections are properly insulated.
4. Fasten the tubes to the outside wall, when possible.
5. Seal the hole through which the cables and tubing pass.
OUTDOOR UNIT
1. Are there unusual noises or vibrations during operation?
Explain the Following Items to the Customer (with the aid of
the Owner’s Manual):
1. Explain care and maintenance.
2. Present the installation instructions to the customer.
OUTDOOR UNIT DIAGNOSTIC GUIDES
For ease of service, the systems are equipped with a diagnostic code display LEDs on both the indoor and outdoor units. The outdoor
diagnostic is displayed on the outdoor unit microprocessor board.
There may be a few error codes displayed in the indoor unit that might relate to the outdoor unit’s problems. If possible, always check the
diagnostic codes displayed on the indoor unit first.
The diagnostic codes displayed on the outdoor units are listed on Table 11.
Table 11—Unit Diagnostic Guides
DISPLAY LED STATUS
E1 Communication malfunction between indoor and outdoor units.
F0 Protection of over-current
F1 Open circuit or short circuit of outdoor ambient temperature sensor T4
F2 Open circuit or short circuit of condenser coil temperature sensor T3
F3 Open circuit or short circuit of Compressor discharge temperature sensor T5
F4 Outdoor unit EEPROM error
F5 Outdoor fan speed has been out of control
P0 IPM malfunction
P1 Over voltage or over low voltage protection
P2 High temperature protection of compressor top
P3 Outdoor low temperature protection
P4 Inverter compressor drive error
P7 Outdoor IGBT temperature sensor error
J0 High temperature protection of indoor coil in heating
J1 Outdoor temperature protection of outdoor coil in cooling
J2 Discharge temperature protection
J3 Protection of active PFC module
J4 Communication error between control board and IPM board
J5 High-pressure switch protection
J6 Low-pressure switch protection
J8 AC voltage protection
For additional diagnostic information, refer to the Service Manual.

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Copyright 2018 CAC/BDP. S7310 W. Morris St. SIndianapolis, IN 46231
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: IM-38MHRB-01
Replaces: NEW
Edition Date: 07/18