Carrier 38MPRA Series, 38MPRAQ09AA3, 38MPRAQ12AA3, 38MPRAQ24AA3, 38MPRAQ18AA3 Service Manual
38MPRA
Outdoor Unit Single Zone Ductless System
Sizes 09 to 24
Service Manual
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS.......................................................1
INTRODUCTION............................................................................1
MODEL NUMBER NOMENCLATURE .......................................2
SPECIFICATIONS ..........................................................................3
DIMENSIONS ................................................................................. 4
CLEARANCES................................................................................6
ELECTRICAL DATA ..................................................................... 7
WIRING...........................................................................................7
CONNECTION DIAGRAM............................................................ 8
WIRING DIAGRAM.......................................................................9
FAN AND MOTOR SPECIFICATIONS........................................12
REFRIGERATION CYCLE DIAGRAM........................................12
REFRIGERANT LINES..................................................................13
SYSTEM EVACUATION AND CHARGING...............................14
OPERATION MODES AND FUNCTIONS...................................15
TROUBLESHOOTING...................................................................20
ERROR DIAGNOSIS AND TROUBLESHOOTING WITHOUT
ERROR CODE.................................................................................22
QUICK MAINTENANCE BY ERROR CODE..............................26
TROUBLESHOOTING BY ERROR CODE .................................. 27
DIAGNOSIS AND SOLUTION...................................................... 29
DISASSEMBLY INSTRUCTIONS ................................................ 45
APPENDICES..................................................................................65
SAFETY CONSIDERATIONS
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 the 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.
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.
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
cleaning coils. All other operations should be performed by trained
service personnel.
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 fire extinguisher nearby when brazing. Use care
in handling, rigging, and setting bulky equipment.
Read this manual 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.
!
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.
INTRODUCTION
This service manual provides the necessary information to service,
repair, and maintain the indoor units. Section 2 of this manual has an
appendix with data required to perform troubleshooting. Use the
“TABLE OF CONTENTS” to locate a desired topic.
MODEL NUMBER NOMENCLATURE
OUTDOOR UNIT
38
MP R A Q
09 A 3
38 = FAN COIL UNIT
MP = MODEL
VOLTAGE
3 = 208/230-1-60
SYSTEM TYPE
R = OUTDOOR UNIT
MAJOR SERIES
MAXIMUM NUMBER OF FAN COIL
UNITS THAT CAN BE CONNECTED
A = 1:1
NOMINAL CAPACITY
09 - 3/4 TON
12 - 1 TON
18 - 1.5 TONS
24 - 2 TONS
A
VARIATIONS
A = STANDARD
SYSTEM TYPE
Q = HEAT PUMP
12
19
10001
Week of Manufacture
Sequential Serial Number
V
V = ALL MODELSYear of Manufacture
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.
Table 1 —Unit Sizes
SYSTEMS TONS KBTUH VOLTAGE/PH/HZ OUTDOOR MODEL
0.75 9,000
1.00 12,000 38MPRAQ12AA3
1.50 18,000 38MPRAQ18AA3
2.00 24,000 38MPRAQ24AA3
38MPRAQ09AA3
208-230/1/60
2 Specifications subject to change without notice. SG-38MPRA-02
SPECIFICATIONS
SYSTEM
Voltage, Phase, Cycle
ELECTRICAL
OPERATING
RANGE
PIPING
REFRIGERANT
OUTDOOR
COIL
COMPRESSOR
OUTDOOR
Cooling Outdoor DB Min - Max °F (°C) -22~122 (-30~50) -22~122 (-30~50) -22~122 (-30~50) -22~122 (-30~50)
Heating Outdoor DB Min - Max °F (°C) -22~86 (-30~30) -22~86 (-30~30) -22~86 (-30~30) -22~86 (-30~30)
Pipe Connection Size - Liquid in (mm) 1/4 (6.35) 1/4 (6.35) 3/8 (9.52) 3/8 (9.52)
Pipe Connection Size - Suction in (mm) 3/8 (9.52) 1/2 (12.7) 5/8 (15.9) 5/8 (15.9)
* Condensing unit above or below the indoor unit.
SIZE 9 12 18 24
OUTDOOR MODEL 38MPRAQ09AA3 38MPRAQ12AA3 38MPRAQ18AA3 38MPRAQ24AA3
V/Ph/Hz
MCA A. 13 15 18 20
MOCP - Fuse Rating A. 15 20 30 30
Total Piping Length ft (m) 98 (30) 98 (30) 98 (30) 98 (30)
Piping Lift
Metering Device EEV EEV EEV EEV
Face Area Sq. Ft. 5.1 5.1 8.2 8.2
No. Rows 2 2 2 3
Fins per inch 21 21 22 22
Oil Type VG74 VG74 VG74 VG74
Oil Charge Fl. Oz. 16.9 16.9 22.7 22.7
Rated Current RLA 8.0 8.0 13.1 13.5
Unit Width in (mm) 33.27 (845) 33.27 (845) 37.24 (946) 37.24 (946)
Unit Height in (mm) 27.64 (702) 27.64 (702) 31.89 (810) 31.89 (810)
Unit Depth in (mm) 14.29 (363) 14.29 (363) 16.14 (410) 16.14 (410)
Net Weight lbs (kg) 107.59 (48.8) 108.47 (49.2) 135.4 (61.4) 145.1 (65.8)
Sound Pressure dB(A) 55.5 56.0 61.5 62.0
*
Type R410A R410A R410A R410A
Charge lbs (kg) 3.5 (1.58) 3.5 (1.58) 5.7 (2.6) 6.5 (2.95)
Circuits 6 6 4 4
Type Rotary Inverter Rotary Inverter Rotary Inverter Rotary Inverter
Model ATM115D43UFZ2 ATM115D43UFZ2 KTM240D57UMT KTM240D57UMT
Airflow CFM 1,380 1,380 2,236 2,236
ft (m) 49 (15) 49 (15) 65 (20) 65 (20)
Table 2 — Specifications
HEAT PUMP
208/230-1-60 208/230-1-60 208/230-1-60 208/230-1-60
SG-38MPRA-02 Specifications subject to change without notice. 3
DIMENSIONS
13.78 (350)
B
1.42 (36) A3
7.83(199) A2
1.10(28)
D3
13.19(335)
14.45(367)
D2
3.62 (92)
2.40 (61)
H1
H2
35.98(914) W1
33.27(845) W
21.86(540) A
27.64(855) W3
27.64 (702)
H
0.51(13)
13.66(347) D
Sizes 9K and 12K
System Size Height (H) in. (mm) Width (W) in. (mm) Depth (D) in. (mm) Weight-Net lbs. (kg)
9K (208/230V) 27.64 (702) 33.27 (845) 14.29 (363) 107.59 (48.8)
12K (208/230V) 27.64 (702) 33.27 (845) 14.29 (363) 108.47 (49.2)
Table 3 — Dimensions
Fig. 1 — Sizes 9K and 12K
4 Specifications subject to change without notice. SG-38MPRA-02
Sizes 18K and 24K
0.94 in(24 mm)
2.87 in (73 mm)
SYSTEM SIZE HEIGHT (H) IN. (MM) WIDTH (W) IN. (MM) DEPTH (D) IN. (MM) WEIGHT-NET LBS. (KG)
18K (208/230V) 31.89 (810) 37.24 (946) 16.14 (410) 135.4 (61.4)
24K (208/230V) 31.89 (810) 37.24 (946) 16.14 (410) 145.1 (65.8)
Fig. 2 — Sizes 18K and 24K
SG-38MPRA-02 Specifications subject to change without notice. 5
CLEARANCES
A
D
B
Air outlet
Air inlet
C
E
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
24in (61cm) or
more is
recommended
for service
9.8in (25cm)
24in (61cm)
or more is
recommended
for service
Fig. 3 — Clearances
Table 4 — Clearances
UNIT MINIMUM VALUE IN. (MM)
A 24 (609)
B 24 (609)
C 24 (609)
D 4 (101)
E 4 (101)
NOTE: The outdoor unit must be mounted at least 2in (50mm) above the maximum anticipated snow depth.
6 Specifications subject to change without notice. SG-38MPRA-02
Fig. 4 —Clearances for multiple units
ELECTRICAL DATA
Table 5 — Electrical Data
9K 12 18K 24K
Heat Pump
Power Supply
Compressor RLA 8.0 9.0 13.07 13.5
Outdoor Fan Motor
*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
Volts-PH-Hz (208/230V) (208/230V) (208/230V) (208/230V)
Max – Min* Oper. Voltage 253-187 253-187 253-187 253-187
MCA 13 15 18 20
MOCP 15 20 30 30
FLA 0.6 0.6 0.6 0.6
Rated HP 0.156 0.156 0.212 0.212
Output 50 50 120 120
WIRING
All wires must be sized per NEC (National Electrical Code) or CEC
(Canadian Electrical Code) and local codes. Use the 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.
CAUTION
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 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 and (S) between the 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.
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.
SG-38MPRA-02 Specifications subject to change without notice. 7
CONNECTION DIAGRAM
S
L1 L2
208/230-1-60
Main
Power Supply
L1
L2
S
L1
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
9K and 12K 230V Indoor Unit 9K and 12K 230V Outdoor Unit
Fig. 5 —Connection Diagram
NOTES:
1. Do not use thermostat wire for any connection between the indoor and outdoor units.
2. All connections between the indoor and outdoor units must be as shown. The connections are polarity sensitive and improper wiring will result in
a fault code (E1). Double check the control wiring before applying power to the outside unit.
8 Specifications subject to change without notice. SG-38MPRA-02
WIRING DIAGRAM
1
2
3
U
V
W
CN60
COMPRESSOR
Y/G
RED
BLUE
BLACK
OUTDOOR
MAIN
PCB
BLUE
BLACK
RED
CN13
CN12
6
CN18
W-YA4
REACTOR
BLUE
BLUE
U
V
W
Y/G
RED
L1
L2
S
L1
L2
TO INDOOR UNIT
POWER SUPPLY
BLACK
L1
L2
16022000019211
BASE PAN HEATER
COMPRESSOR CRANKCASE HEATER
CN4
OUTDOOR WIRING DIAGRAM
OUTDOOR
DC FAN
CN414
3
CN30
CN10
CN1
CONDENSER
TEMPERATURE SENSOR
OUTDOOR AMBIENT
TEMPERATURE SENSOR
WHITE
KCALB
DISCHARGE SENSOR
KCALB
DER
CN17
BLACK
CN2
CN7
CN8
Y/G
BROWN
BLUE
CN3
CN16
ELECTRONIC
EXPANSION
VALV E
CN6-1
Sizes 09K to 12K
CODE PART NAME CODE PART NAME
CN2 Output: communication signal (to indoor unit) CN12,CN13 Output: High voltage to reactor
CN7, 8 Input: 220 VAC High voltage (to indoor unit) U V W Output: Pulse (0-320VDC) to compressor
CN60 Output: 220 VAC for 4-way valve control CN10
CN16 Output: 220 VAC High voltage to crankcase heater CN1
CN414 Output: Pulse (0-320VDC) to outdoor fan motor CN6-1 Ground Connector
CN5 (CN4) Output: 220 VAC High voltage to base pan heater CN18 Output:Pin5&6 (12V) to electronic expansion valve
Fig. 6 —Wiring Diagram - Sizes 09K and 12K
Input: Pin1-Pin2 (0-5VDC) from discharge temperature
Input: Pin1, Pin3, Pin4, Pin5 (0-5VDC) from condenser
and outdoor ambient temperature sensors
sensor
Table 6 — Diagram Sizes 09K and 12K (208-230V)
ABBREVIATION PARAPHRASE
4-Way Refrigerant Valve Assembly / 4-WAY VALVE
AC-FAN Alternating Current FAN
Table 7 — Abbreviation
DC-FAN Direct Current FAN
CT1 AC Current Detector
COMP Compressor
L-PRO Low Pressure Switch
H-PRO High Pressure Switch
SG-38MPRA-02 Specifications subject to change without notice. 9
Sizes 18K to 24K
TP
EEV
FAN1
~
DRIVER BOARD
7
7
Applicable to the units
adopting AC motor only
CAP1
M
5(6)
5
4-WAY1
OPTIONAL
NOTE:Four-way valve
is used in the
Heat pump unit only
Compressor crankcase heater
Basepan heater
Applicable to the units
adopting a DC motor only
Y/G
Notes:
This symbol indicates the element is optional,
the actual shape shall prevail.
NOTE:Use the magnetic ring
(not supplied, optional part)
to connect the connective cable
of the indoor and outdoor units
after installation. One magnetic
ring is used for one cable
.
L1
L2
BLUE(BLACK)
S
L1
L2
1L1L
L2
Y/G
FM1
MAIN BOARD
BLUE
CN10~CN44 Output:230VAC High voltage Basepan Heater
CN17~CN21 Output:Pin1-Pin4:Pulse waveform (0-12VDC), Pin5, Pin6(12VDC)
CN27~CN30 Output:Pin 2~Pin3(230VAC High voltage)
L
Fig. 7 — Wiring Diagram - Sizes 18K and 24K
Table 8 — Wiring Diagram - Sizes 18K and 24K
CODE PART NAME
CN1~CN2 Input:230VAC High voltage
OUTDOOR UNIT MAIN BOARD
CN5~CN6 Output:230VAC High voltage
P-1 Connection to the earth
CN4~CN40 Output:230VAC High voltage Compressor Crankcase Heater
CN3~CN22 Output:230VAC High voltage
CN7 Output:Pin1(12VDC), Pin2(5VDC)Pin3(EARTH)
CN13 Pin1,Pin3,Pin5,Pin7,Pin9(5VDC):Pin2,Pin4,Pin6,Pin8,Pin10(0-5VDC)
CN33 Input:Pin1(0-5VDC),Pin2(5VDC), Discharge Temp
CN8 Input:Pin3,Pin4(5VDC),Pin2(0VDC),Pin1,Pin5(0-5VDC)
CN9 Input:Pin2,Pin4(0VDC),Pin1,Pin3(0-5VDC)H/L Pressure Switch
10 Specifications subject to change without notice. SG-38MPRA-02
Sizes 18K and 24K (continued)
Table 9 — Wiring Diagram - Sizes 18K and 24K
CODE PART NAME CODE PART NAME
COMP COMPRESSOR L PFC INDUCTOR
CAP1 FAN MOTOR CAPACITOR L-PRO LOW PRESSURE SWITCH
HEAT CRANKCASE HEATING TP DISCHARGE TEMPERATURE SENSOR
FM1 OUTDOOR DC FAN SV 4-WAY VALVE
FAN1 OUTDOOR AC FAN T3 CONDENSER TEMPERATURE SENSOR
EEV ELECTRONIC EXPANSION VALVE T4 OUTDOOR AMBIENT TEMPERATURE SENSOR
H-PRO HIGH PRESSURE SWITCH TH HEATSINK TEMPERATURE SENSOR
Table 10 — Wiring Diagram - Sizes 18K and 24K
OUTDOOR UNIT PFC & MAIN BOARD
CODE PART NAME
CN53~CN54 Input:230VAC High voltage
CN55 Output:Pin1(12VDC),Pin2(5VDC),Pin3(EARTH)
CN19 Pin1~Pin3:Connect to FAN voltage among phases 0~200VAC
U~V~W Connect to compressor voltage among phases 0~200VAC
CN51~CN52 Output:224-380VDC High Voltage
SG-38MPRA-02 Specifications subject to change without notice. 11
FAN AND MOTOR SPECIFICATIONS
LIQUID SIDE
GAS SIDE
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
COMPRESSOR
ïWAY VALV E
ïWAY VALV E
ïWAY VALV E
COOLING
HEATING
T2 Evaporator
temp. sensor
T1 Room temp.
sensor
ACCUMULATOR
CHECK VALVE
(Heating Model only)
CAPILLARY TUBE
Table 11 — Fan and Motor Specifications
9K
(208/230V)
MATERIAL - glass fiber+AS glass fiber+AS glass fiber+AS glass fiber+AS
OUTDOOR FAN
OUTDOOR FAN
MOTOR
TYPE - ZL-490*151*12-3KN ZL-490*151*12-3KN ZL-560*139*12-3KN ZL-560*139*12-3KN
DIAMETER INCH 19.29(490) 19.29(490) 22.05(560) 22.05(560)
HEIGHT INCH 5.94(151) 5.94(151) 5.47(139) 5.47(139)
MODEL - ZKFN-50-8-2 ZKFN-50-8-2 ZKFN-120-8-2 ZKFN-120-8-2
VOLTS V 208/230 208/230 208/230 208/230
PHASE 1 1 1 1
HERTZ HZ 60 60 60 60
FLA A 0.6 0.6 0.6 0.6
RATED HP HP 0.156 0.156 0.156 0.156
OUTPUT W 50 50 120 120
TYPE - DC DC DC DC
INSULATION
CLASS
- E E E E
SAFE CLASS - IPX4 IPX4 IPX4 IPX4
INPUT W 115 115 156 156
RANGE OF
CURRENT
RATED
CURRENT
AMPS 0.5 0.5 0.55 .055
AMPS 0.5±10% 0.5±10% 0.5±10% 0.5±10%
CAPACITOR ΜF No Capacitor
SPEED
RATED RPM
REV/
MIN
REV/
MIN
900/850/750 900/850/750 1050/900/850 1050/900/850
900 900 1050 1050
MAX. INPUT W 137 137 156 156
12K
(208/230V)
18K
(208/230V)
24K
(208/230V)
REFRIGERATION CYCLE DIAGRAM
ROODTUOROODNI
12 Specifications subject to change without notice. SG-38MPRA-02
Fig. 8 —Heat Pumps
REFRIGERANT LINES
General Refrigerant Line Sizing
1. The outdoor units are shipped with a full charge of R410A refrigerant. All charges, line sizing, and capacities are based on runs of 25 ft. (7.6 m).
For runs over 25 ft. (7.6 m), consult “Long Line Applications:” for the proper charge adjustments.
2. The minimum refrigerant line length between the indoor and outdoor units is 10 ft. (3 m).
3. Refrigerant lines should not be buried in the ground. If it is necessary to bury the lines, not more than 36 in (914 mm) should be buried. Provide a
minimum 6 in (152 mm) vertical rise to the service valves to prevent refrigerant migration.
4. Both lines must be insulated. Use a minimum of 1/2 in. (12.7 mm) thick insulation. Closed-cell insulation is recommended in all long line
applications.
5. Special consideration should be given to isolating the interconnecting tubing from the building structure. Isolate the tubing so vibration or noise is
not transmitted into the structure.
IMPORTANT: Both refrigerant lines must be insulated separately.
Table 12 lists the maximum allowed lengths.
Table 12 — Piping and Refrigerant Information
SYSTEM SIZE 9K (208-230V) 12K (208-230V) 18K (208-230V) 24K (208-230V)
Min. Piping Length ft. (m) 9.8 (3) 9.8 (3) 9.8 (3) 9.8 (3)
Standard Piping Length ft. (m) 24.6 (7.5) 24.6 (7.5) 24.6 (7.5) 24.6 (7.5)
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)
Piping
Total Max. Piping Length per system ft. (m) 98 (30) 98 (30) 98 (30) 98 (30)
Additional refrigerant charge
(between Standard – Max piping length)
Suction Pipe (size - connection type) In (mm) 3/8” (9.52) 1/2” (12.7) 5/8” (15.9) 5/8” (15.9)
Liquid Pipe (size - connection type) In (mm) 1/4” (6.35) 1/4” (6.35) 3/8” (9.52) 3/8” (9.52)
Refrigerant Type Type R410A R410A R410A R410A
Refrigerant Heat Pump Models Charge Amount ozs (kg) 56.44 (1.6) 56.44 (1.6) 91.7 (2.60) 104.1 (2.95)
ft. (m) 49 (15) 49 (15) 98 (30) 98 (30)
ft. (m) 49 (15) 49 (15) 65.3 (20) 65.3 (20)
ft. (m) 24.6 (7.5) 24.6 (7.5) 24.6 (7.5) 24.6 (7.5)
Oz/ft
(g/m)
0.161 (15) 0.161 (15) 0.32 (30) 0.32 (30)
Long Line Applications:
1. No change in line-set diameter size is required.
2. Add refrigerant per the “Additional Charge Table”.
Table 13 — Additional Charge Table
TOTAL LINE
UNIT SIZE
9
12
18
24
SG-38MPRA-02 Specifications subject to change without notice. 13
LENGTH FT (M)
Min Max
10 (3) 98 (30) None
ADDITIONAL CHARGE, OZ/FT. FT (M)
10-25
(3-8)
>25-98
(8-30)
0.16
0.32
SYSTEM EVACUATION AND
O
utdoor Unit
Indoor Unit
Refrigerant
Service Valve
Gas Side
Liquid Side
A
B
C
D
Manifold Gage
500 microns
Low side valve
High side valve (remains closed)
Charge hose
Vacuum pump
Unit service valve
(requires 5/16" to 1/4"
Schrader adapter for
evacuation/charging)
Low Side Hose
500
MINUTES
01234567
1000
1500
LEAK IN
SYSTEM
VACUUM
TIGHT
TOO WET
TIGHT
DRY SYSTEM
2000
MICRONS
2500
3000
3500
4000
4500
5000
CHECK FOR TIGHT, DRY SYSTEM
(IF IT HOLDS DEEP VACUUM)
EVACUATE TO 500 MICRONS MINIMUM (HOLD FOR 30 MINUTES)
CHARGE INTO SYSTEM BY OPENING
BREAK VACUUM WITH DRY NITROGEN TO 2 PSIG
EVACUATE TO 1000 MICRONS
BREAK VACUUM WITH DRY NITROGEN TO 2 PSIG
CHARGING
CAUTION
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.
Refrigerant tubes and indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. Always break a
vacuum with dry nitrogen.
System Vacuum and Charge
NOTE: DO NOT open the service valves until unit
evacuation procedure is complete.
Using Vacuum Pump
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 the vacuum depth. The deep vacuum method is the most
positive way of assuring a system is free of air and liquid water (see
Fig. 11).
1. Completely tighten all the flare nuts and connect the manifold gage
charge hose to a charge port of the low side service valve (see Fig.
9).
2. Connect the charge hose to the vacuum pump.
3. Fully open the low side of the manifold gage (see Fig. 10).
4. Start the vacuum pump.
5. Evacuate using the triple evacuation method.
6. After the 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 as specified in the “Additional Charge Table” on
page 13.
8. Disconnect the charge hose from the charge connection of the low
side service valve.
9. Fully open the service valves; B and A.
10. Securely tighten the service valve caps.
Fig. 9 — Service Valve
Fig. 11 — Deep Vacuum Graph
Triple Vacuum Method
The triple evacuation method should be used. Refer to Fig. 12 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 the vacuum until the system reaches 2 psig.
4. Close the service valve and allow the system to stand for 1hr.
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.
EVACUATE TO 1500 MICRONS
14 Specifications subject to change without notice. SG-38MPRA-02
Fig. 10 — Manifold
RELEASE
VALVES COMPLETELY
Fig. 12 —Triple Evacuation Method
Final Tubing Check
IMPORTANT: Ensure that the factory tubing, on both the
indoor and outdoor units, has not shifted during shipment.
Ensure tubes are not rubbing against each other or any
sheet metal. Pay close attention to feeder tubes to ensure
the wire ties on the feeder tubes are secure and tight.
OPERATION MODES AND FUNCTIONS
Abbreviation
Table 14 — Unit Element Abbreviations
ABBREVIATION ELEMENT
T1 Indoor room temperature
T2 Evaporator Coil temperature
T3 Condenser Coil temperature
T4 Outdoor ambient temperature
Tsc Adjusted setting temperature
TP Compressor discharge temperature
Safety Features
Compressor Three-Minute Delay at Restart
Compressor functions are delayed for up to ten seconds upon the first
start-up of the unit, and are delayed for up to three minutes upon
subsequent unit restarts.
Automatic shutoff based on discharge temperature
If the compressor discharge temperature exceeds 226F (108C) for
nine seconds, the compressor ceases operation.
Automatic shutoff based on fan speed
If the indoor fan speed registers below 300RPM or over 1500RPM
for an extended period of time, the unit ceases operation and the
corresponding error code appears on the indoor unit.
Inverter module protection
The inverter module has an automatic shutoff mechanism based on the
unit’s current, voltage, and temperature. If the automatic shutoff is
initiated, the corresponding error code appears on the indoor unit and
the unit ceases operation.
Indoor fan delayed operation
• When the unit starts, the louver is automatically activated and the
indoor fan will operate after a period of setting time or when the
louver is in place.
• If the unit is in the HEATING mode, the indoor fan is regulated by
the anti-cold wind function.
Display Function
Unit Display Functions
Fig. 13 — Unit Display Functions
Table 15 — Unit Function Displays
FUNCTION DISPLAY
Temperature Set temperature value
Temperature (FAN and DRYING mode) Room temperature
Activation of Timer ON, Fresh, Swing,
Turbo, or Silent
Cancellation of Timer OFF, Fresh, Swing,
Turbo, or Silent
Defrost
Warming in heating mode
Self-clean
Heating in room temp under
46°F (8°C) or 54°F (12°C)
Fresh (Not available on these systems)
ECO function
ON(3S)
OF(3S)
dF
cF
SC
FP
Compressor Preheating
Preheating is automatically activated when the T4 sensor is lower than
the setting temperature.
Wi-Fi Control
Sensor redundancy and automatic shutoff
The current operation power
• If one temperature sensor malfunctions, the air conditioner
continues operation and displays the corresponding error code,
allowing for emergency use.
• When more than one temperature sensor malfunctions, the air
conditioner stops.
SG-38MPRA-02 Specifications subject to change without notice. 15
(Not available on these systems)
kW
FAN Mode
When the FAN mode is activated:
• The outdoor fan and compressor stop.
• Temperature control is disabled and the indoor room temperature
is displayed.
• The indoor fan speed can be set to 1%~100%, or AUTO.
• The louver operations are identical to those in COOLING mode.
• Auto fan: In FAN-ONLY mode, the AC operates the same as auto
fan in the COOLING mode with the temperature set at 75F
(24°C). (Tsc=75°F (24°C)).
COOLING Mode
Compressor Control
Reach the configured temperature:
1. When the compressor runs continuously for less than 120 minutes:
• If the following conditions are satisfied, the compressor ceases
operation.
• While the calculated frequency (fb) is less than the minimum
limit frequency (FminC).
• While the protective time is more than or equal to ten minutes.
• While T1 is lower than or equal to (Tsc-CDIFTEMP 31F (-0.5C)
NOTE: CDIFTEMP is the EEPROM setting parameter. It
is 4
°F (2°C).
2. When the compressor runs continuously for more than 120
minutes:
• If the following conditions are satisfied, the compressor ceases
operation.
• When the calculated frequency (fb) is less than the minimum
limit frequency (FminC).
• When the protective time is more than or equal to ten minutes.
• When T1 is lower than or equal to (Tsc-CDIFTEMP).
NOTE: CDIFTEMP is the EEPROM setting parameter. It
is 4
°F (2°C).
3. If one of the following conditions is satisfied, regardless of time:
• The compressor running frequency is more than the test
frequency.
• When the compressor running frequency is equal to the test
frequency, T4 is more than 59F (15C) or no T4 or T4 fault.
• Change setting temperature
• Turbo or sleep function on/off
• Various frequency limit shutdown occurs
Indoor Fan Control
1. In the COOLING mode, the indoor fan operates continuously. The
fan speed can be set to 1%-100%, or AUTO.
2. AUTO fan
• Descent Curve
• When T1-Tsc is lower than or equal to 6F (3.5C), fan speed
reduces to 80%;
• When T1-Tsc is lower than or equal to 2F (1C), fan speed
reduces to 60%;
• When T1-Tsc is lower than or equal to 1F (0.5C), fan speed
reduces to 40%;
• When T1-Tsc is lower than or equal to 0F (0C), fan speed
reduces to 20%;
• When T1-Tsc is lower than or equal to -1F (-0.5C), fan
speed reduces to 1%.
• Rise Curve
• When T1-Tsc is higher than 0F (0C), fan speed increases to
20%;
• When T1-Tsc is higher than 1F (0.5C), fan speed increases
to 40%;
• When T1-Tsc is higher than 2F (1C), fan speed increases to
60%;
• When T1-Tsc is higher than 3F (1.5C), fan speed increases
to 80%;
• When T1-Tsc is higher than 7F (4C), fan speed increases to
100%.
Outdoor Fan Control
• The outdoor unit runs at a different fan speed according to T4 and
the compressor running frequency.
• For different outdoor units, the fan speeds differ.
Condenser Temperature Protection
When the condenser temperature exceeds a configured value, the
compressor ceases operations.
Evaporator Temperature Protection
When the evaporator temperature drops below a configured value, the
compressor and the outdoor fan cease operations.
NOTE: CDIFTEMP is EEPROM setting parameter. It is
4
°F (2°C).
16 Specifications subject to change without notice. SG-38MPRA-02
HEATING Mode
“ ”
Compressor Control
1. Reach the configured temperature:
• If the following conditions are satisfied, the compressor stops:
• While the calculated frequency (fb) is less than the minimum
limit frequency (FminC).
• When the protective time is more than or equal to ten minutes.
• When T1 is higher than or equal to Tsc+HDIFTEMP2.
NOTE: HDIFTEMP2 is the EEPROM setting parameter.
It is 4
°F (2°C).
• If one of the following conditions is satisfied, regardless of
time:
• Compressor running frequency is more than test frequency.
• When the compressor running frequency is equal to the test
frequency, T4 is more than 59°F (15°C) or no T4 or T4 fault.
• A change in the setting temperature.
• TURBO or SLEEP function ON or OFF.
2. When the current is higher than the predefined safe value, the surge
protection is activated, causing the compressor to cease operations.
Indoor Fan Control
1. In the HEATING mode, the indoor fan operates continuously. The
fan speed can be set to 1%-100%, or muted.
2. AUTO fan
• Rise curve
• When T1-Tsc is higher than -3°F (-1.5°C), fan speed reduces
to 80%;
• When T1-Tsc is higher than 0°F (0°C), fan speed reduces to
60%;
• When T1-Tsc is higher than 1°F (0.5°C), fan speed reduces to
40%;
• When T1-Tsc is higher than 2°F (1°C), fan speed reduces to
20%.
•Descent curve
•When T1-Tsc is lower than or equal to 1°F (0.5°C), fan speed
increases to 20%;
• When T1-Tsc is lower than or equal to 0°F (0°C), fan speed
increases to 60%;
• When T1-Tsc is lower than or equal to -3°F (-1.5°C), fan
speed increases to 80%;
• When T1-Tsc is lower than or equal to -1.5°F (-3°C), fan
speed increases to 100%.
DEFROSTING Mode
• The unit enters the DEFROSTING mode according to changes in
the temperature value of T3, T4 as well as the compressor running
time.
• In the DEFROSTING mode, the compressor continues to run, the
indoor and outdoor motor will cease operation, the indoor unit’s
defrost light turn on, and the symbol appears.
• If any one of the following conditions is satisfied, defrosting ends
and the machine switches to the normal HEATING mode:
• T3 rises above TCDE1C.
• T3 maintained above TCDE2C for 80 seconds.
• Unit runs for 15 minutes consecutively in the DEFROSTING
mode.
Evaporator Temperature Protection
• Off: Compressor stops.
• Decrease: Decrease the running frequency to the lower level per
20 seconds.
• Hold: Keep the current frequency.
• Resume: No limitation for frequency.
AUTO Mode
• This mode can be selected with the remote controller and the
setting temperature can be changed between 61°F~86°F
(16°C~30°C).
• In the AUTO mode, the unit selects the COOLING, HEATING,
AUTO-DRYING or FAN-ONLY mode on the basis of T1,Ts, T4
and relative humidity.
• If the setting temperature is modified, the unit selects a new
running function.
DRY Mode
In the DRY mode, the air conditioner operates the same as auto fan in
the COOLING mode.
1. Mute function is active.
• All protections are activated and operate the same as they do
that in COOLING mode.
2. Low Room Temperature Protection
• If the room temperature is lower than 10°C, the compressor
ceases operations and does not resume until the room
temperature exceeds 12°C.
Outdoor Fan Control
•The outdoor unit runs at a different fan speed according to T4
and the compressor running frequency.
• For different outdoor units, the fan speeds differ.
SG-38MPRA-02 Specifications subject to change without notice. 17
Forced Operation Function
• Forced COOLING Mode
The compressor and outdoor fan continue to run and the indoor
fan runs at rated speed. After running for 30 minutes, the air
conditioner switches to AUTO mode with a preset temperature
of 24°C.
• Forced AUTO Mode:
Forced auto mode operates the same as normal AUTO mode
with a preset temperature of 24°C.
•The unit exits the forced operation when it receives the following
signals:
• Switch on
• Switch off
• Timer on
• Timer off
• Changes in:
• Mode
• Fan Speed
• Setting Temperature
Timer Function
• The Timing range is 24 hours.
• Timer on. The machine turns on automatically when reaching the
setting time.
• Timer off. The machine turns off automatically when reaching the
setting time.
• Timer on/off. The machine turns on automatically when reaching
the setting “on” time, and then turns off automatically when
reaching the setting “off” time.
• Timer off/on. The machine turns off automatically when reaching
the setting “off” time, and then turns on automatically when
reaching the setting “on” time.
• The timer function will not change the AC current operation mode.
Suppose the AC is off now, it will not start up first after setting the
“timer off” function. And when reaching the setting time, the timer
LED will be off and the AC running mode has not been changed.
• The setting time is relative time.
• The AC exits the timer function when it has malfunction.
Auto-Restart Function
• The indoor unit has an auto-restart module that allows the unit to
restart automatically. The module automatically stores the current
settings and, in the case of a sudden power failure, will restore
those setting automatically within 3 minutes after power returns.
• If there is a power failure while the unit is running, the compressor
starts 3 minutes after the unit restarts. If the unit was already off
before the power failure, the unit stands by.
46°F (8°C) Heating
In the HEATING mode, the temperature can be set to a temperature
as low as 46°F (8°C), preventing the indoor area from freezing if
unoccupied during severe cold weather.
ECO Function
• Used to enter the energy efficient mode.
•Under the COOLING mode, press ECO, the remote controller
adjusts the temperature automatically to 75°F (24°C), AUTO fan
speed to save energy (however only if the set temperature is less
than 75°F (24°C). If the set temperature is more than 75°F
(24°C) and 86°F (30°C), press ECO, the fan speed will change to
AUTO, the set temperature will remain unchanged.
• When AC receives signals, such as switch off, Turbo operation,
SILENCE operation, Self Clean operation, Forced COOLING
operation, mode setting, SLEEPING mode, or adjusting the set
temperature to less than 75°F (24°C), it will exit the ECO
operation.
• Operation time in ECO mode is 8 hours. After 8 hours the air
conditioner exits this mode.
• If there is a malfunctioning temperature sensor in, the air
conditioner exits the ECO mode.
• The indoor fan runs at auto fan when it enters the ECO mode. The
setting temperature and setting fan speed can be changed with the
remote controller.
Self Clean
• Press “Self Clean” when the unit is in the COOLING or
DRYING mode, the indoor unit runs at the low fan speed for 16
minutes then turn off.
• Self Clean keeps the indoor unit dry and prevents mold growth.
SLEEP Function
• The SLEEP function is available in COOLING, HEATING, or
AUTO modes.
• The operational process for sleep mode is as follows:
•When cooling, the temperature rises 34°F (1°C) (to not higher
than 86°F (30°C) every hour). After 2 hours, the temperature
stops rising and the indoor fan is fixed at low speed.
•When heating, the temperature decreases 34°F (1°C) (to not
lower than 61°F (16°C)) every hour.
•After 2 hours, the temperature stops decreasing and the indoor
fan is fixed at low speed. Anti-cold wind function takes
priority.
• The operating time for the SLEEP mode is 8 hours, after which,
the unit exits this mode and turns off.
• The timer setting is available in this mode.
Follow Me
• If you press “Follow Me” on the remote controller, the indoor unit
will beep. This indicates the “Follow Me” function is active.
• Once active, the remote controller will send a signal every 3
minutes, with no beeps. The unit automatically sets the
temperature according to the measurements from the remote
controller.
• The unit will only change modes if the information from the
remote controller makes it necessary, not from the unit’s
temperature setting.
• If the unit does not receive a signal for 7 minutes or you press
“Follow Me”, the function turns off. The unit regulates
temperature based on its own sensor and settings.
18 Specifications subject to change without notice. SG-38MPRA-02
Silence
Press SILENCE on the remote controller to enable the SILENCE
function. While this function is active, the indoor unit runs at faint
breeze (1% fan speed), which reduces noise to the lowest possible
level.
Occupancy Sensor (Sizes 09K-12K)
With the built-in infrared sensor, the indoor unit detects human
movement. The compressor operates in a low frequency if you leave
the room for 30 minutes. The compressor operates in a lower
frequency if you leave the room for 120 minutes, and resumes
automatically when you come back, which helps save energy.
Table 16 — Information Codes
DISPLAYED CODE EXPLANATION ADDITIONAL NOTES
T1 T1 T1 temperature
T2 T2 T2 temperature
T3 T3 T3 temperature
T4 T4 T4 temperature
TP TP TP temperature
Targeted Frequency FT Targeted Frequency
Actual Frequency TR Actual Frequency
Compressor Current dL N/A
Outdoor AC Voltage UO N/A
Indoor capacity test Sn N/A
Reserve -- Running mode
Outdoor Fan Speed Pr Outdoor fan speed
EXV opening angle LR EXV opening angle
Indoor fan speed IR Indoor fan speed
Indoor humidity HU N/A
Adjusted setting temperature TT N/A
Indoor dust concentrations DT N/A
Wi-Fi signal strength IF N/A
GA algorithm frequency OT N/A
Information Inquiry
To enter information inquiry status, complete the following procedure
within ten seconds:
• Press LED 3 times.
• Press SWING 3 times. If successful, you will hear beeps for two
seconds.
• Use LED and SWING to cycle through the information displayed.
• Press LED to display the next code in the sequence.
• Press SWING to display the previous code.
Table 16 displays the information codes. The screen displays the code
for two seconds, then the information for 25 seconds.
SG-38MPRA-02 Specifications subject to change without notice. 19
TROUBLESHOOTING
Electrolytic Capacitors
Safety
WARNING
UNIT DAMAGE HAZARD
Electricity remains in capacitors even when the power supply is off.
Ensure the capacitors are fully discharged before troubleshooting.
(HIGH VOLTAGE! CAUTION!)
Fig. 14 — Electrolytic Capacitors
For other models, please connect discharge resistance (approximately 100 40W) or a soldering iron (plug) between the +, - terminals of the
electrolytic capacitor on the other side of the outdoor PCB.
Fig. 15 — Discharge Position
NOTE: Fig. 15 is for reference only. Actual appearances may vary.
20 Specifications subject to change without notice. SG-38MPRA-02
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