Carrier 38MGR Series, 38MGRQ30D 3 Series, 38MGRQ24C 3 Series, 38MGRQ18B 3 Series, 38MGRQ48E 3 Series Service Manual
...
SERVICE MANUAL
38MGR
Multi-zone Outdoor Unit Ductless System
Sizes 18, 24, 30, 36 and 48
TABLE of CONTENTS
SAFETY CONSIDERATIONS.......................................................1
INTRODUCTION............................................................................1
MODEL / SERIAL NUMBER NOMENCLATURES....................2
SPECIFICATIONS ..........................................................................3
DIMENSIONS ................................................................................. 4
CLEARANCES................................................................................8
ELECTRICAL DATA ..................................................................... 9
WIRING...........................................................................................9
CONNECTION DIAGRAMS .........................................................10
AUTOMATIC WIRING/PIPING CORRECTION ......................... 13
WIRING DIAGRAMS.....................................................................14
REFRIGERATION CYCLE DIAGRAMS......................................22
REFRIGERANT LINES..................................................................24
SYSTEM EVACUATION AND CHARGING...............................25
ELECTRONIC FUNCTION............................................................ 26
TROUBLESHOOTING...................................................................31
OUTDOOR UNIT DIGITAL DISPLAY......................................... 32
OUTDOOR UNIT DISPLAY.......................................................... 32
APPENDICES..................................................................................64
DISASSEMBLY INSTRUCTIONS SIZE 18.................................. 72
DISASSEMBLY INSTRUCTIONS SIZE 24.................................. 80
DISASSEMBLY INSTRUCTIONS SIZE 30.................................. 89
DISASSEMBLY INSTRUCTIONS SIZES 36 AND 48................. 96
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.
When working on the equipment, observe 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 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.
PAGE
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.
WARNING
EXPLOSION HAZARD
Failure to follow this warning could result
in death, serious personal injury, and/or
property damage. Never use air or gases
containing oxygen for leak testing or
operating refrigerant compressors.
Pressurized mixtures of air or gases
containing oxygen can lead to an explosion.
CAUTION
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 multi-zone family of heat pumps. This
manual has an appendix with data required to perform
troubleshooting. See “APPENDICES” on page 64. Use the “TABLE
of CONTENTS” on page 1 to locate a desired topic.
MODEL / SERIAL NUMBER NOMENCLATURES
OUTDOOR UNIT
38 MG
R Q 18
- - 3
38 = OUTDOOR UNIT
MG = ALL
VOLTAGE
3 = 208/230-1-60
UNIT TYPE
R = OUTDOOR UNIT
NOMINAL CAPACITY
18 - 1 1/2 TONS
24 - 2 TONS
30 - 2 1/2 TONS
36 - 3 TONS
48 - 4 TONS
NOT USED
B
MAXIMUM NUMBER OF FAN COIL UNITS THAT
CAN BE CONNECTED TO THE OUTDOOR UNIT
B = 1:2
C = 1:3
D = 1:4
E = 1:5
SYSTEM TYPE
Q = HEAT PUMP
Week of Manufacture
Year of Manufacture V = ALL MODELS
Sequential Serial Number
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
SYSTEM TONS kBTUh VOLTAGE - PHASE OUTDOOR MODEL
1.5 18 208/230-1 38MGRQ18B--3
2 24 208/230-1 38MGRQ24C--3
2.5 30 208/230-1 38MGRQ30D--3
3 36 208/230-1 38MGRQ36D--3
4 48 208/230-1 38MGRQ48E--3
25 18
V 10001
2 Specifications subject to change without notice. 38MGR-04SM
SPECIFICATIONS
SIZE 18 24 30 36 48
System
Operating
Range
Piping
Refrigerant
Electrical
Compressor
Outdoor Unit
OUTDOOR MODEL
Max Number of Zones
Cooling Outdoor DB
Min - Max
Heating Outdoor DB
Min - Max
Total Piping Length
Piping to furthest FCU
Drop (OD above ID)
Lift (OD below ID)
Pipe Connection
Size - Liquid
Pipe Connection
Size - Suction
Type
Charge
Metering Device
Voltage, Phase, Cycle V/Ph/Hz 208/230-1-60
Power Supply Indoor unit powered from outdoor unit
MCA A. 18 25 30 35 35
MOCP - Fuse Rating A. 25 35 45 50 50
Type Rotary Inverter
Model ATM150D23UFZ ATF235D22UMT ATF310D43UMT ATQ360D1UMU ATQ360D1UMU
Oil Type ESTER OIL VG74
Oil Charge Fl. Oz. 17.64 23.58 35.27 49.38 49.38
Rated Current RLA 10 15 19 21 21
Unit Width in (mm) 37.31 (948) 41.22 (1047) 41.22 (1047) 41.15 (1045) 41.15 (1045)
Unit Height in (mm) 27.64 (702) 31.88 (810) 31.88 (810) 52.48 (1333) 52.48 (1333)
Unit Depth in (mm) 14.82 (376) 17.91 (455) 17.91 (455) 17.63 (448) 17.63 (448)
Net Weight lbs (kg) 105.8 (48) 149.9 (68) 156.5 (71) 221.6 (100.5) 223.8 (101.5)
Airflow CFM 1,390 2,130 2,130 4,500 4,500
Sound Pressure dB(A) 62 63 62 64 64
Table 2 — Specifications
38MGRQ18B--3 38MGRQ24C--3 38MGRQ30D--3 38MGRQ36D--3 38MGRQ48E--3
2 3 4 4 5
°F (°C)
°F (°C)
ft (m) 131 (40) 197 (60) 263 (80) 328 (100) 328 (100)
ft (m) 82 (25) 98 (30) 115 (35) 115 (35) 115 (35)
ft (m) 49 (15) 49 (15) 49 (15) 65 (20)
ft (m) 49 (15) 49 (15) 49 (15) 65 (20) 65 (20)
in (mm)
in (mm)
lbs (kg) 4.41 (2.0) 6.17 (2.8) 6.61 (3.0) 10.13 (4.6) 10.13 (4.6)
-13~122
(-25~50)
-22~86
(-30~30)
1/4*2
(6.35*2)
3/8*2
(9.52*2)
EEV EEV EEV EEV EEV
-13~122
(-25~50)
-22~86
(-30~30)
1/4*3
(6.35*3)
3/8*3
(9.52*3)
-13~122
(-25~50)
(-30~30)
(6.35*4)
1/2 *1+ 3/8*3
(12.7*1+9.52*3)
R410A
-22~86
1/4*4
-13~122
(-25~50)
-22~86
(-30~30)
1/4*4
(6.35*5)
1/2 *1+ 3/8*3
(12.7*1+9.52*3)
-13~122
(-25~50)
-22~86
(-30~30)
1/4*5
(6.35*5)
1/2 *2+ 3/8*3
(12.7*2+9.52*3)
* Condensing unit above or below the indoor unit.
38MGR-04SM Specifications subject to change without notice. 3
DIMENSIONS
UNIT SIZE
Height
Width
Depth
Weight-Net
Table 3 — Dimensions
18 24 30 36 48
in (mm) 27.6 (703) 31.89 (810) 31.89 (810) 52.48 (1333) 52.48 (1333)
in (mm) 37.31 (948) 41.22 (1047) 41.22 (1047) 41.14 (1045) 41.14 (1045)
in (mm) 14.82 (376) 17.91 (455) 17.91 (455) 17.63 (448) 17.63 (448)
lbs (kg) 105.8 (48) 149.9 (68) 156.5 (71) 221.6 (100.5) 223.8 (101.5)
Fig. 1 — Size 18K
NOTE: Master valves are not available on the 18K unit.
4 Specifications subject to change without notice. 38MGR-04SM
DIMENSIONS (CONT)
Fig. 2 — Size 24K
Fig. 3 — Size 30K
38MGR-04SM Specifications subject to change without notice. 5
DIMENSIONS (CONTINUED)
Fig. 4 — Size 36K
6 Specifications subject to change without notice. 38MGR-04SM
DIMENSIONS (CONT)
Fig. 5 — Size 48K
38MGR-04SM Specifications subject to change without notice. 7
CLEARANCES
A
D
B
Air-outlet
Air-inlet
C
E
59in (150cm)
or more when
facing each other
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
9.8in (25cm) or more for proper airflow
24in (61cm) or more is recommended
for service
9.8in (25cm) or more for proper
airflow 24in (61cm) or more
is recommended for
service
Fig. 6 — Unit Clearances
Table 4 — Unit Clearances
UNIT
A 24 (609)
B 24 (609)
C 24 (609)
D 4 (101)
E 6 (152)
NOTE: The outdoor unit must be mounted at least 2 in. (50mm) above the maximum anticipated snow depth.
MINIMUM VALUE
in. (mm)
8 Specifications subject to change without notice. 38MGR-04SM
Fig. 7 — Clearances for multiple units
ELECTRICAL DATA
Table 5 — Electrical Data
UNIT SIZE
18
24 15 0.9 0.16 120 25 35
30 19 1.3 0.16 120 30 45
36 21 1.0x2 0.11 85 35 50
48 21 1.0x2 0.11 85 35 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
SYSTEM VOLTAGE OPERATING VOLTAGE COMPRESSOR OUTDOOR FAN
VOLT / PHASE / HZ MAX / MIN* RLA FLA HP W
10 0.74 0.07 50 18 25
208-230/1/60 253 / 187
MCA MOCP
WIRING
All wires must be sized per NEC (National Electrical Code) or CEC
(Canadian Electrical Code) and local codes. See the rating plate and/
or the installation instructions of the compatible outdoor unit for MCA
(minimum circuit amps) and MOCP (maximum over current
protection) to correctly size the wires and the disconnect fuse or
breakers respectively.
Recommended Connection Method for Power and
Communication Wiring:
The main power is supplied to the outdoor unit. The field supplied 14/
3 stranded wire with ground with a 600 volt insulation rating, power/
communication wiring from the outdoor unit to indoor unit consists of
four (4) wires and provides the power for the indoor unit. Two wires
are line voltage AC power, one is communication wiring (S) and the
other is a ground wire. Wiring between indoor and outdoor unit is
polarity sensitive. The use of BX wire is NOT recommended.
If installed in a high Electromagnetic field (EMF) area and
communication issues exists, a 14/2 stranded shielded wire can be
used to replace L2 and (S) between outdoor unit and indoor unit
landing the shield onto ground in the outdoor unit only.
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
Wires should be sized based on NEC and local codes.
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
Be sure to comply with local codes while running wire from
the indoor unit to the outdoor unit.
Every wire must be connected firmly. Loose wiring may
cause the terminal to overheat or result in unit malfunction. A
fire hazard may also exist. Ensure all wiring is tightly
connected.
No wire should touch the refrigerant tubing, compressor or
any moving parts.
Disconnecting means must be provided and shall be located
within sight and readily accessible from the air conditioner.
Connecting cable with conduit shall be routed through the
hole in the conduit panel.
CAUTION
CAUTION
WARNING
AUTO mode is recommended to be used on single zone
applications ONLY, it is NOT recommended to be used on
multi-zone Applications.
Using AUTO changeover on multi-zone applications could
set an indoor unit on STANDBY, indicated as (--) on the
display, turning off this indoor unit until all the indoor units
are on the same mode (COOLING or HEATING).
HEATING mode is the priority in the system.
Simultaneous HEATING and COOLING is not allowed.
38MGR-04SM Specifications subject to change without notice. 9
CONNECTION DIAGRAMS
208-230-1-60
FIELD POWER SUPPLY
208-230-1-60
Main
Power Supply
208-230-1-60
Power to
Indoor Unit A
Indoor
Unit A
Signal
High
L2
L1(A)
S(A)
L2(A)
Ground
CONNECTING CABLE
OUTDOOR TO INDOOR
S
L1
L2
Indoor Unit A
Power Supply
208-230-1-60
Unit A
Signal
High
Voltage
GND
Ground
CONNECTING CABLE
OUTDOOR TO INDOOR
S
L1
L2
Indoor Unit B
Power Supply
208-230-1-60
Unit B
Signal
High
Voltage
GND
Ground
L1(B)
L2(B)
S(B)
Power to
Indoor Unit B
208-230-1-60
Indoor
Unit B
Signal
High
Voltage
208-230-1-60
FIELD POWER SUPPLY
208-230-1-60
Main
Power Supply
208-230-1-60
Power to
Indoor Unit A
Indoor
Unit A
Signal
High
Voltage
L2
L1(A)
S(A)
L2(A)
Ground
L1(B)
L1(C)
L2(B)
L2(C)
S(B) S(C)
Power to
Indoor Unit B
Power to
Indoor Unit C
208-230-1-60
208-230-1-60
Indoor
Unit B
Signal
High
Voltage
Indoor
Unit C
Signal
High
Voltage
CONNECTING CABLE
OUTDOOR TO INDOOR
S
L1
L2
Indoor Unit A
Power Supply
208-230-1-60
Indoor
Unit A
Signal
High
Voltage
GND
Ground
CONNECTING CABLE
OUTDOOR TO INDOOR
S
L1
L2
Indoor Unit B
Power Supply
208-230-1-60
Indoor
Unit B
Signal
High
Voltage
GND
Ground
CONNECTING CABLE
OUTDOOR TO INDOOR
S
L1
L2
Indoor Unit C
Power Supply
208-230-1-60
Indoor
Unit C
Signal
High
Voltage
GND
Ground
Indoor
Indoor
Fig. 8 — Size 18K 2 Zone
Voltage
10 Specifications subject to change without notice. 38MGR-04SM
Fig. 9 — Size 24K 3 Zone
CONNECTION DIAGRAMS (CONT)
Fig. 10 — Size 30K 4 Zone
Fig. 11 — Size 36K 4 Zone
38MGR-04SM Specifications subject to change without notice. 11
CONNECTION DIAGRAMS (CONT)
208-230-1-60
FIELD POWER SUPPLY
208-230-1-60
Main
Power Supply
208-230-1-60
Power to
Indoor Unit A
Indoor
Unit A
Signal
High
Voltage
L2
L1(A)
S(A)
L2(A)
Ground
)C(1L)B(1L)C(2L)B(2L
)C(S)B(S
Power to
Indoor Unit B
Power to
Indoor Unit C
208-230-1-60
208-230-1-60
Indoor
Unit B
Signal
High
Voltage
Indoor
Unit C
Signal
High
Voltage
CONNECTING CABLE
OUTDOOR TO INDOOR
S
L1
L2
Indoor Unit A
Power Supply
208-230-1-60
Indoor
Unit A
Signal
High
Voltage
GND
Ground
CONNECTING CABLE
OUTDOOR TO INDOOR
S
L1
L2
Indoor Unit B
Power Supply
208-230-1-60
Indoor
Unit B
Signal
High
Voltage
GND
Ground
CONNECTING CABLE
OUTDOOR TO INDOOR
S
L1
L2
Indoor Unit C
Power Supply
208-230-1-60
Indoor
Unit C
Signal
High
Voltage
GND
Ground
L1(D) L2(D)
S(D)
Power to
Indoor Unit D
208-230-1-60
Indoor
Unit D
Signal
High
Voltage
CONNECTING CABLE
OUTDOOR TO INDOOR
S
L1
L2
Indoor Unit D
Power Supply
208-230-1-60
Indoor
Unit D
Signal
High
Voltage
GND
Ground
L1(E) L2(E)
S(E)
Power to
Indoor Unit E
208-230-1-60
Indoor
Unit E
Signal
High
Voltage
CONNECTING CABLE
OUTDOOR TO INDOOR
S
L1
L2
Indoor Unit E
Power Supply
208-230-1-60
Indoor
Unit E
Signal
High
Voltage
GND
Ground
Fig. 12 — Size 48K 5 Zone
12 Specifications subject to change without notice. 38MGR-04SM
AUTOMATIC WIRING/PIPING CORRECTION
Indoor unit A
Indoor unit B
Indoor unit A
Indoor unit B
LED display
Check Switch
Terminal
block
Liquid/
Gas Pipe
B
A
B
A
Correct
Outdoor unit
Incorrect wiring
Terminal
block
B
A
Liquid/
Gas PipeBA
Outdoor unit
Incorrect wiring
Terminal
block
B
A
Liquid/
Gas Pipe
B
A
Outdoor unit
Indoor unit A
Indoor unit B
The unit is capable of automatically correcting a wiring/piping error. Indoor units do not have to be in the run mode. The outdoor temperature
should be above 41F (5C) to use this feature. Press the CHECK button on the outdoor unit PCB board for 6 seconds until the display shows
“CE” (“FA” may appear first – continue to press CHECK).
The outdoor unit takes control of the indoor units and adjust fan speed(s) according to the program. Setpoint display (if available) will be “76”
and outdoor unit will start the compressor and fan to dispense refrigerant to the indoor heads to determine piping setup versus physical wiring.
When the controller has adjusted control so that each indoor unit is synced to its piping port (approximately 5-10 minutes, depending on
temperature, unit size, etc.), “CE” is replaced with “00” on the display and the control program terminates.
NOTE: The indoor units will not automatically release from the “76” setting or return to previous control. Use the indoor
units’ remote controllers to restore them to normal function.
Fig. 13 — Automatic Wiring/Piping Correction
38MGR-04SM Specifications subject to change without notice. 13
WIRING DIAGRAMS
COMPRESSOR
CN1
U(R)
V(S)
W(C)
ELECTRONIC
EXPANSIVE
VALVE
BLUE
BLACK
U
V
W
CN7
VALVE-A
INDOOR PIPE
OUT TEMP
MAIN BOARD
CN19
CN17
T4
T3
P-1
RED
CN18
VALVE-B
CN29
CN21
CN15
T2B
CN14
LOW/HIGH
CN12
CompTop
YELLOW
RED
4
IPM BOARD
BLUE
Y/G
L-OUT
Y/G
CN6
CN5
HEATER1
HEAT1
CN1
CN2
4-WAY
4-WAY
HEATER2
OPTIONAL
CN9
CN8
HEAT2
CN2
CN3
REACTOR
BLUE
BLUE
P2
P1
REACT0R2 R05094A
OPTIONAL
WHITE
WHITE
Y/G
NOTE:Use the magnetic ring
(not supplied, optional part)
to hitch the connective cable
of indoor and outdoor units
after installation. one magnetic
ring is used for one cable.
DC FAN
6
CN14
L1-IN
L2-IN
CN25
CN23
S-A
S-B
CN3
CN4
BLACK
BLUE
BROWN
BLACK
RED
BROWN
BLUE
BLACK
Y/G
3
ELECTRONIC
EXPANSIVE
VALVE
3
6
P-2
L1(A)
TO B
S(A)
L2
L2(A)
L1
Y/G
Y/G
L1(B)
L2(B)
S(B)
3
3
Size 18K
CN4
~
~
CN5
RED(BROWN)
POWER
A
B
LOW PRESSURE PROTECT
HIGH PRESSURE PROTECT
Fig. 14 — Size 18K - 2 Zone
Table 6 — Size 18K - 2 Zone Max Codes
CODE PART NAME
CN3~CN4 Input: 230VAC High voltage
CN23,CN25 Output: Pin1 (Connection of the high voltage)---“S”Pin2~Pin3 (230VAC High voltage)---“L1 & L2”
P1~P2 Output: Connection of the REACTOR
CN1~CN2 Output: 230VAC High voltage ----4 Way Valve
CN5~CN6 Output: 230VAC High voltage----Compressor Crankcase Heater
CN8~CN9 Output: 230VAC High voltage----Chassis Crankcase Heater
P-1~P-2 Connection to the earth
CN18, CN19 Output: Pin1-Pin4: Pulse waveform (0-12VDC), Pin5, Pin6 (12VDC)--EEV
CN7 Input:Pin1 (0-5VDC), Pin2 (5VDC)--Discharge Sensor
CN17 Input: Pin3, Pin4 (5VDC), Pin2 (0VDC), Pin1, Pin5 (0-5VDC)-Cond. and Ambient Temperature
CN15 Input: Pin1, Pin3, Pin5 (5VDC) Pin2, Pin4, Pin6 (0-5VDC)--IDU Pipe Temp
CN14 Input: Pin2, Pin4 (0VDC), Pin1, Pin3 (0-5VDC)---H/L Pressure Switches
CN12 Input: Pin1 (0-5VDC), Pin2 (5VDC)--Compressor Temp
CN29~L-OUT Output: 230VAC High voltage--to IPM Board
CN 21 Connect to IPM BOARD
CODE PART NAME
CN4~CN5 Input: 230VAC High voltage---from the Main Board
CN2~CN3 Output: Connection of the REACTOR
U~V~W Connection to compressor voltage among phases 0~200VAC
CN14 Connection to DC FAN
CN1 Connection to MAIN BOARD
14 Specifications subject to change without notice. 38MGR-04SM
Table 7 — Outdoor Unit IPM Board
WIRING DIAGRAMS (CONT)
COMPRESSOR
CN1
U(R)
V(S)
W(C)
ELECTRONIC
EXPANSIVE
VALVE
BLUE
BLACK
U
V
W
CN7
VALVE-A
INDOOR PIPE
OUT TEMP
MAIN BOARD
CN19
CN17
T4
T3
P-1
RED
CN18
VALVE-B
CN29
CN21
CN15
T2B
CN14
LOW/HIGH
CN12
CompTop
YELLOW
RED
4
IPM BOARD
BLUE
Y/G
CN22
VALVE-C
L-OUT
Y/G
CN6
CN5
HEATER1
HEAT1
CN1
CN2
4-WAY
4-WAY
HEATER2
OPTIONAL
CN9
CN8
HEAT2
CN2
CN3
REACTOR
BLUE
BLUE
P2
P1
REACT0R2 R05094A
OPTIONAL
WHITE
WHITE
Y/G
NOTE:Use the magnetic ring
(not supplied, optional part)
to hitch the connective cable
of indoor and outdoor units
after installation. one magnetic
ring is used for one cable.
DC FAN
6
CN14
L1-IN
L2-IN
CN25
CN23
S-A
S-B
CN3
CN4
BLACK
BLUE
BROWN
BLACK
RED
S-C
CN20
L1 L2
Y/G
BROWN
BROWN
BLUE
BLUE
BLACK
BLACK
Y/G
Y/G
L1(A)
S(A)
L2(A)
L1(B)
S(B)
L2(B)
L1(C)
L2(C)
S(C)
Y/G
3
ELECTRONIC
EXPANSIVE
VALVE
ELECTRONIC
EXPANSIVE
VALVE
3
6
6
P-2
3
33
Size 24K
CN4
~
~
CN5
RED(BROWN)
POWER
C
A
B
LOW PRESSURE PROTECT
HIGH PRESSURE PROTECT
Fig. 15 — Size 24K - 3 Zone Max
Table 8 — Size 24K - 3 Zone Max Codes
OUTDOOR UNIT MAIN BOARD
CODE PART NAME
CN3~CN4 Input: 230VAC High voltage
CN20,CN23,CN25 Output: Pin1 (Connection of the high voltage)---“S” Signal Pin2~Pin3 (230VAC High voltage)---IDU Power
P1~P2 Output: Connection of the REACTOR
CN1~CN2 Output: 230VAC High voltage---4 way Valve
CN5~CN6 Output: 230VAC High voltage---Compressor Crankcase Heater
CN8~CN9 Output: 230VAC High voltage---Chassis Crankcase Heater
P-1~P-2 Connection to the earth
CN18,CN19,CN22 Output: Pin1-Pin4: Pulse waveform (0-12VDC), Pin5, Pin6 (12VDC)---EEV
CN7 Input: Pin1 (0-5VDC), Pin2 (5VDC)--- Discharge Temp
CN17 Input: Pin3, Pin4 (5VDC), Pin2 (0VDC), Pin1, Pin5 (0-5VDC)-Conditioner and Ambient Temperature
CN15 Input: Pin1, Pin3, Pin5 (5VDC) Pin2, Pin4, Pin6 (0-5VDC)---IDU Pipe Temp
CN14 Input: Pin2, Pin4 (0VDC), Pin1, Pin3 (0-5VDC)---H/L Pressure Switch
CN12 Input: Pin1 (0-5VDC), Pin2 (5VDC)---Compressor Temp
CN29~L-OUT Output: 230VAC High voltage to IPM Board
Cn21 Connect to the IPM BOARD
CODE PART NAME
CN4~CN5 Input: 230VAC High voltage
CN2~CN3 Output: Connection of the REACTOR
U~V~W Connect to compressor voltage among phases 0~200VAC
CN14 Connect to the DC FAN
CN1 Connect to the MAIN BOARD
38MGR-04SM Specifications subject to change without notice. 15
Table 9 — Size 24K - 3 Zone Max Codes
OUTDOOR UNIT IPM BOARD
WIRING DIAGRAMS (CONT)
COMP
FM1
MAIN BOARD
U
V
W
L
DRIVER BOARD
7
7
YELLOW
Applicable to the units
adopting DC motor only
CN52
CN6
SV
4-WAY1
BLUE
HEAT_D
HEAT_Y
OPTIONAL
3
BLACK
RED
BLUE
BLUE
YELLOW
BLACK
EEV
CN20
M
5(6)
A
CN21
M
5(6)
B
CN17
M
5(6)
C
CN18
M
5(6)
D
CN19
M
5(6)
E
T2B-A B C D E
CN13
INDOOR PIPE OUT
TEMP A B C D E
CN5
CN2
CN1
CN30
CN29
CN27
CN28
P-1
Y/G
BLACK
BLUE
BROWN
POWER
S(D)
L2(D)
L1(D)
S(C)
L1(C)
L2(C)
L1(B)
L2(B)
S(B)
L1 L2
L1(A)
L2(A)
S(A)
TO A
Y/G
TO B
Y/G
TO C
Y/G
TO D
Y/G
BLACK
BLUE
BROWN
BLACK
BLUE
BROWN
BLACK
BLUE
BROWN
BLACK
RED
YELLOW
L-PRO
T3
T4
H-PRO
TP
CN33
CN8
CN9
CN41
CN42
CN43
CN3
CN22
CN4
CN10
CN7
CN44
CN40
BLUE
BLUE
BLUE
RED
BLACK
BLACK
RED
CN51
CN53
CN54
RED
CN55
CN19
3
Y/G
Y/G
U
V
W
BLUE
3
3
3
3
Size 30K
Fig. 16 — Size 30K - 4 Zone Max
Table 10 — Size 30K 4 Zone Max Codes
CODE PART NAME
CN1~CN2 Input: 230VAC High voltage
CN5~CN6 Output: 230VAC High voltage
P-1 Connection to the earth
CN10~CN44 Output: 230VAC High voltage Chassis Crankcase Heater
CN4~CN40 Output: 230VAC High voltage Compressor Crankcase Heater
CN3~CN22 Output:230VAC High voltage
CN17~CN21 Output: Pin1-Pin4: Pulse waveform (0-12VDC), Pin5, Pin6 (12VDC)
CN7 Output: Pin1 (12VDC), Pin2 (5VDC), Pin3 (EARTH)
CN27~CN30 Output: Pin 2~Pin 3 (230VAC High voltage) - IDU Power & “S”
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) T3 & T4
CN9 Input: Pin2, Pin4 (0VDC), Pin1, Pin3 (0-5VDC) H/L Pressure Switches
16 Specifications subject to change without notice. 38MGR-04SM
WIRING DIAGRAMS (CONT)
Size 30K
Table 11 — 30K - 4 Zone Max
OUTDOOR UNIT PFC & IPM 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 CN51~EARTH,CN52~EARTH Output: 224-380VDC High voltage
Table 12 — 30K - 4 Zone Max
CODE PART NAME CODE PART NAME
COMP COMPRESSOR L PFC INDUCTOR
CAP1 FAN MOTOR CAPACITOR L-PRO LOW PRESSURE SWITCH
HEAT CRANKCASE HEATING TP EXHAUST 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
38MGR-04SM Specifications subject to change without notice. 17
WIRING DIAGRAMS (CONT)
T2B
A
B
C
D
E
CN11
INDOOR
PIPE OUT
TEMP
XT2
XT3
BROWN
BLUE
BLACK
CN21
CN16
CN13
C
E
D
MAIN BOARD
CN15
A
ELECTRONIC EXPANSIVE VALVE A
CN12
TH
CN10
RED
L-PRO
H-PRO
CN9
T4
T3
AMBIENT SENSOR
PIPE TEMP.SENSOR
D
12
3
4
5
CN36
P5
CN19
CN20
CN28
CN24
CN25
CN31
CN17
FAN1
CN18
HEAT_D
OPTIONAL
HEAT_Y
OPTIONAL
SV
4-WAY
BLUE
RED
BLUE
CN4
CN2
CN3
CN1
Ferrite bead
CH2
CN6
CN9
10
3
CN1
CN2
L
YELLOW
YELLOW
U
V
W
BLUE
BLACK
RED
WIHTE
/RED
BLACK
RED
BLACK
Ferrite bead
CH1
CT1
DCFAN2
DCFAN1
Y/G
Y/G
DC MOTOR
DRIVER BOARD
CON1
FAN1
CN1
FAN 2
3
3
P6
2
CN6
CN3
Y/G
BLACK
L2
L1
MAIN
POWER SUPPLY
XT1
N
L
P9
CN8
PAIQI
ORANGE
ORANGE
RED
BLACK
CH2
Ferrite bead
Ferrite bead
Ferrite bead
CH2
CH2
~
~
~
Ferrite bead
e prevail.
CN34
CN32
CN27
YELLOW
S(E)
L2(E)
L1(E)
S(D)
L2(D)
L1(D)
S(C)
L2(C)
L1(C)
BROWN
BLUE
BLACK
BROWN
BLUE
BLACK
TO D
TO C
S(B)
TO B
CN37
CN29
B
A
L2(B)
L1(B)
S(A)
L2(A)
L1(A)
BROWN
BLUE
BLACK
TO A
A
B
C
D
E
CN23
B
ELECTRONIC EXPANSIVE VALVE B
RED
CN26
C
ELECTRONIC EXPANSIVE VALVE C
RED
CN30
D
ELECTRONIC EXPANSIVE VALVE D
RED
CN33
E
ELECTRONIC EXPANSIVE VALVE E
RED
RED
3
3
3
3
3
Size 36K
Notes:
This symbol indicates the element
is optional,the actual shape shall
b
V
U
COMP
Y/G
W
IPM & PFC BOARD
BLACK
BLUE
BROWN
Fig. 17 — Wiring Diagram 36K - 4 Zone Max
NOTE: Electronic Expansion Valve E is only available on the 48K - 5 Zone Max (see Fig. 18).
18 Specifications subject to change without notice. 38MGR-04SM
WIRING DIAGRAMS (CONT)
Size 36K
Table 13 — 36K - 4 Zone Max
OUTDOOR UNIT MAIN BOARD
CODE PART NAME
CN1~ CN3 Input: 230VAC High voltage
CN13, CN16, CN21, CN29, CN37 Output: Pin1(Connection of the high voltage) “S” Pin2~ Pin3 (230VAC High voltage)“L1&L2”
P5, P6, P9 Connection to the earth
CN22 Output:-24VDC-24VDC
CN17~ CN18 Output: 230VAC High voltage to 4 way valve
CN19~ CN20 Output: 230VAC High voltage Compressor Crankcase Heater
CN24~ CN25 Output: 230VAC High voltage Chassis Crankcase Heater
CN11 Input: Pin1, Pin3, Pin5, Pin7, Pin9 (5VDC) Pin2, Pin4, Pin6, Pin8, Pin10 (0-5VDC) indoor pipe out sensor
CN12 Input: Pin1 (0-5VDC), Pin2 (5VDC) Heatsink Temperature Sensor
CN8 Input: Pin1 (0-5VDC), Pin2 (5VDC) Compressor top sensor (PAIQI)
CN9 Input: Pin3, Pin4 (5VDC), Pin2 (0VDC), Pin1, Pin5 (0-5VDC) Pipe sensor and ambient sensor
CN15, CN23, CN26 CN30, CN33 Output: Pin1-Pin4: Pulse waveform (0-12VDC), Pin5, Pin6 (12VDC) to EEV
CN6
CN2~ CN4 Output: 230VAC High voltage to IPM & PFC Board
CN10 Input: Pin2, Pin4 (0VDC), Pin1, Pin3 (0-5VDC)--H/L Pressure switch
CODE PART NAME
CN1~CN6 Output: 224-380VDC High voltage
CN2~CN6 Output: 224-380VDC High voltage
CN3~CN6 Output: 224-380VDC High voltage
U~V~W Connect to compressor voltage among phases 0~200VAC
CN9
FAN1
Communication: Pin1-Pin6: Pulse waveform (0-5VDC), Pin7, Pin9 (0VDC) Pin8 (0-5VDC), Pin10 (5VDC)-
-to IPM & PFC board
Table 14 — 36K - 4 Zone Max
OUTDOOR UNIT PFC and IPM BOARD
Communication: Pin1-Pin6: Pulse waveform (0-5VDC), Pin7, Pin9 (0VDC), Pin8 (0-5VDC), Pin10 (5VDC)
to the main board
Output: Pin1~Pin2: High voltage (224-380VDC), Pin4 (0-15VDC) Pin5 (0-5.6VDC), Pin6: Pulse waveform
(0-15VDC) to drive board
Table 15 — 36K - 4 Zone Max
OUTDOOR UNIT DC MOTOR DRIVER BOARD
CODE PART NAME
CON1 Output: Pin1~Pin2:High voltage (224-380VDC)
CN1 Input:Pin4: Pulse waveform (0-15VDC), Pin3 (0-6.5VDC) Pin2 (0VDC), Pin1 (15VDC)
FAN1 Pin1-Pin3: Connect to FAN voltage among phases 0~200VAC
FAN2 Pin1-Pin3: Connect to FAN voltage among phases 0~200VAC
Table 16 — 36K - 4 Zone Max
CODE PART NAME
COMP COMPRESSOR
CAP1,CAP2 FAN MOTOR CAPACITOR
CT1 AC CURRENT DETECTOR
D DIODE MODULE
EEV ELECTRONIC EXPANSION VALVE
FM1, FM2 OUTDOOR DC FAN
FAN1, FAN2 OUTDOOR AC FAN
HEAT CRANKCASE HEATING
H-PRO HIGH PRESSURE SWITCH
L PFC INDUCTOR
L-PRO LOW PRESSURE SWITCH
KM AC CONTACTOR
SV 4-WAY VALVE
TP EXHAUST TEMPERATURE SENSOR
T3 CONDENSER TEMPERATURE SENSOR
T4 OUTDOOR AMBIENT TEMPERATURE SENSOR
TH HEATSINK TEMPERATURE SENSOR
PAIQI COMPRESSOR TOP SENSOR (GAS PIPE)
CH1, CH2, CH3 FERRITE BEAD
38MGR-04SM Specifications subject to change without notice. 19
WIRING DIAGRAMS (CONT)
T2B
A
B
C
D
E
CN11
INDOOR
PIPE OUT
TEMP
XT2
XT3
TO E
BROWN
BLUE
BLACK
CN21
CN16
CN13
C
E
D
MAIN BOARD
CN15
A
ELECTRONIC EXPANSIVE VALVE A
CN12
TH
CN10
RED
L-PRO
H-PRO
CN9
T4
T3
AMBIENT SENSOR
PIPE TEMP.SENSOR
D
12
3
4
5
CN36
P5
CN19
CN20
CN28
CN24
CN25
CN31
CN17
FAN1
CN18
HEAT_D
OPTIONAL
HEAT_Y
OPTIONAL
SV
4-WAY
BLUE
RED
BLUE
CN4
CN2
CN3
CN1
COMP
U
V
W
Y/G
Ferrite bead
CH2
CN6
CN9
10
3
CN1
CN2
L
YELLOW
YELLOW
U
V
W
BLUE
BLACK
RED
WIHTE
/RED
BLACK
RED
BLACK
Ferrite bead
CH1
CT1
DCFAN2
DCFAN1
Y/G
Y/G
DC MOTOR
DRIVER BOARD
CON1
FAN1
CN1
FAN2
3
3
P6
2
CN6
CN3
Y/G
BLACK
L2
L1
MAIN
POWER SUPPLY
XT1
N
L
P9
CN8
PAIQI
ORANGE
ORANGE
RED
BLACK
CH2
Ferrite bead
Ferrite bead
Ferrite bead
CH2
CH2
~
~
~
Ferrite bead
This symbol indicates the element
is optional,the actual shape shall
e prevail.
CN34
CN32
CN27
YELLOW
S(E)
L2(E)
L1(E)
S(D)
L2(D)
L1(D)
S(C)
L2(C)
L1(C)
BROWN
BLUE
BLACK
BROWN
BLUE
BLACK
TO D
TO C
S(B)
TO B
CN37
CN29
B
A
L2(B)
L1(B)
S(A)
L2(A)
L1(A)
BROWN
BLUE
BLACK
TO A
A
B
C
D
E
CN23
B
ELECTRONIC EXPANSIVE VALVE B
RED
CN26
C
ELECTRONIC EXPANSIVE VALVE C
RED
CN30
D
ELECTRONIC EXPANSIVE VALVE D
RED
CN33
E
ELECTRONIC EXPANSIVE VALVE E
RED
RED
3
3
3
3
3
Size 48K
20 Specifications subject to change without notice. 38MGR-04SM
Notes:
b
IPM & PFC BOARD
Fig. 18 — Wiring Diagram 48K - 5 Zone Max
BLACK
BLUE
BROWN
WIRING DIAGRAMS (CONT)
Size 48K
Table 17 — 48K - 5 Zone Max
OUTDOOR UNIT MAIN BOARD
CODE PART NAME
CN1~CN3 Input: 230VAC High voltage
CN13,CN16,CN21,CN29,CN37 Output: Pin1 (Connection of the high voltage) “S” Pin2~Pin3 (230VAC High voltage) “L1 & L2”
P5,P6,P9 Connection to the earth
CN22 Output:-24VDC-24VDC
CN17~CN18 Output: 230VAC High voltage to 4 way valve
CN19~CN20 Output: 230VAC High voltage Compressor Crankcase Heater
CN24~CN25 Output: 230VAC High voltage Chassis Crankcase Heater
CN11 Input: Pin1, Pin3, Pin5, Pin7, Pin9 (5VDC) Pin2, Pin4, Pin6, Pin8, Pin10 (0-5VDC) indoor pipe out sensor
CN12 Input: Pin1 (0-5VDC), Pin2 (5VDC) Heatsink Temperature Sensor
CN8 Input: Pin1 (0-5VDC), Pin2 (5VDC) Compressor top sensor (PAIQI)
CN9 Input: Pin3, Pin4 (5VDC), Pin2 (0VDC), Pin1, Pin5 (0-5VDC) Pipe sensor and ambient sensor
CN15,CN23,CN26 CN30,CN33 Output: Pin1-Pin4: Pulse waveform (0-12VDC), Pin5, Pin6 (12VDC) to EEV
CN6
CN2~CN4 Output: 230VAC High voltage to IPM & PFC Board
CN10 Input: Pin2, Pin4 (0VDC), Pin1, Pin3 (0-5VDC)--H/L Pressure switch
CODE PART NAME
CN1~CN6 Output: 224-380VDC High voltage
CN2~CN6 Output: 224-380VDC High voltage
CN3~CN6 Output: 224-380VDC High voltage
U~V~W Connect to compressor voltage among phases 0~200VAC
CN9
FAN1
Communication: Pin1-Pin6: Pulse waveform(0-5VDC), Pin7, Pin9 (0VDC) Pin8 (0-5VDC), Pin10 (5VDC)--to
IPM&PFC board
Table 18 — 48K - 5 Zone Max
OUTDOOR UNIT PFC AND IPM BOARD
Communication: Pin1-Pin6: Pulse waveform (0-5VDC), Pin7, Pin9 (0VDC), Pin8 (0-5VDC), Pin10 (5VDC) to
the main board
Output: Pin1~Pin2: High voltage (224-380VDC),Pin4 (0-15VDC) Pin5 (0-5.6VDC), Pin6: Pulse waveform (015VDC) to drive board
Table 19 — 48K - 5 Zone Max
OUTDOOR UNIT DC MOTOR DRIVER BOARD
CODE PART NAME
CON1 Output: Pin1~Pin2: High voltage (224-380VDC)
CN1 Input: Pin4: Pulse waveform (0-15VDC), Pin3 (0-6.5VDC) Pin2 (0VDC),Pin1 (15VDC)
FAN1 Pin1-Pin3:Connect to FAN voltage among phases 0~200VAC
FAN2 Pin1-Pin3:Connect to FAN voltage among phases 0~200VAC
Table 20 — 48K - 5 Zone Max
CODE PART NAME
COMP COMPRESSOR
CAP1,CAP2 FAN MOTOR CAPACITOR
CT1 AC CURRENT DETECTOR
D DIODE MODULE
EEV ELECTRONIC EXPANSION VALVE
FM1, FM2 OUTDOOR DC FAN
FAN1,FAN2 OUTDOOR AC FAN
HEAT CRANKCASE HEATING
H-PRO HIGH PRESSURE SWITCH
L PFC INDUCTOR
L-PRO LOW PRESSURE SWITCH
KM AC CONTACTOR
SV 4-WAY VALVE
TP EXHAUST TEMPERATURE SENSOR
T3 CONDENSER TEMPERATURE SENSOR
T4 OUTDOOR AMBIENT TEMPERATURE SENSOR
TH HEATSINK TEMPERATURE SENSOR
PAIQI COMPRESSOR TOP SENSOR (GAS PIPE)
CH 1, CH 2, CH 3 FERRITE BEAD
38MGR-04SM Specifications subject to change without notice. 21
REFRIGERATION CYCLE DIAGRAMS
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
Compressor
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
middle
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T5 Discharge
temp. sensor
T4 Ambient
temp. sensor
EXV A
CAPILIARY A
CHECK VALVE
CAPILIARY TUBE
EXV B
CAPILIARY B
LIQUID VALVE B
GAS VALVE B
Accumulator
T2B-A
Evaporator
temp. sensor outlet
T2B-B
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
Compressor
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
middle
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T5 Discharge
temp. sensor
T4 Ambient
temp. sensor
EXV A
CAPILIARY A
CHECK VALVE
CAPILIARY TUBE
EXV B
CAPILIARY B
LIQUID VALVE B
GAS VALVE B
EXV C
CAPILIARY C
LIQUID VALVE C
GAS VALVE C
Accumulator
T2B-A
Evaporator
temp. sensor outlet
T2B-B
T2B-C
ROODTUOROODNI
Fig. 19 — Size 18K
Fig. 20 — Size 24K
ROODTUOROODNI
22 Specifications subject to change without notice. 38MGR-04SM
REFRIGERATION CYCLE DIAGRAMS (CONT)
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
Compressor
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
middle
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T5 Discharge
temp. sensor
T4 Ambient
temp. sensor
ROODTUOROODNI
EXV A
CAPILIARY A
CHECK VALVE
CAPILIARY TUBE
EXV B
CAPILIARY B
LIQUID VALVE B
GAS VALVE B
EXV C
CAPILIARY C
LIQUID VALVE C
GAS VALVE C
EXV D
CAPILIARY D
LIQUID VALVE D
GAS VALVE D
Accumulator
High pressure
switch
Low pressure
switch
T2B-A
Evaporator
temp. sensor outlet
T2B-B
T2B-C
T2B-D
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
COOLING
HEATING
T2 Evaporator
temp. sensor
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T4 Ambient
temp. sensor
ROODTUOROODNI
EXV A
CAPILIARY A
CHECK VALVE
CAPILIARY TUBE
EXV B
CAPILIARY B
LIQUID VALVE B
GAS VALVE B
EXV C
CAPILIARY C
LIQUID VALVE C
GAS VALVE C
EXV D
CAPILIARY D
LIQUID VALVE D
GAS VALVE D
EXV E
CAPILIARY E
LIQUID VALVE E
GAS VALVE E
Compressor
4-WAY VALVE
T5 Discharge
temp. sensor
Accumulator
High pressure
switch
Low pressure
switch
Fig. 21 — Sizes 30K and 36K
Fig. 22 — Size 48K
38MGR-04SM Specifications subject to change without notice. 23
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)
per number of zones. For runs over 25 ft. (7.6 m), consult the Long Line Application section on this page for 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 36in (914 mm) should be buried. Provide a
minimum 6in (152 mm) vertical rise to the service valves to prevent refrigerant migration.
4. Both lines must be insulated. Use a minimum of 1/2in. (12.7 mm) thick insulation. Closed-cell insulation is recommended in all long-line
applications.
5. Special consideration should be given to isolating 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 21 displays the following maximum lengths allowed.
Table 21 — Piping and Refrigerant
SYSTEM SIZE 18K 24K 30K 36K 48K
Min. Piping Length per each indoor unit ft. (m) 10 (3) 10 (3) 10 (3) 10 (3) 10 (3)
Standard Piping Length per each indoor
unit
Max. outdoor-indoor height difference
(OU higher than IU)
Max. outdoor-indoor height difference
(IU higher than OU)
Max. height different between indoor
units
Max. Length per each indoor unit ft. (m) 82 (25) 98 (30) 115 (35) 115 (35) 115 (35)
Piping
Refrigerant
Max. Piping Length with no additional
refrigerant charge per System (Standard
Piping length x No. of Zones)
Total Maximum Piping Length per
system
Additional refrigerant charge
(between Standard – Max piping length)
Suction Pipe (size - connection type)
Liquid Pipe (size - connection type)
Refrigerant Type R410A
Heat Pump Models Charge Amount Lbs (kg) 4.41 (2.0) 6.17 (2.8) 6.61 (3.0) 10.14 (4.6) 10.14 (4.6)
NOTE: The refrigerant charge included is adequate for the outdoor unit’s maximum number of zones multiplied by the
standard piping length per zone. For piping runs greater than the “Maximum Piping Length with no additional
refrigerant charge per System,” see Additional Charge Table Per Zone (Table 22).
ft. (m) 25 (7.5) 25 (7.5) 25 (7.5) 25 (7.5) 25 (7.5)
ft. (m) 49 (15) 49 (15) 49 (15) 49 (15) 65 (20)
ft. (m) 49 (15) 49 (15) 49 (15) 49 (15) 65 (20)
ft. (m) 32 (10) 32 (10) 32 (10) 32 (10) 32 (10)
ft. (m) 49 (15) 74 (22) 98 (30) 98 (30) 123 (37.5)
ft. (m) 131 (40) 197 (60) 263 (80) 328 (100) 328 (100)
Oz/ft (g/m) 0.16 (15) 0.16 (15) 0.16 (15) 0.16 (15) 0.16 (15)
in 3/8*2 3/8*3 1/2 *1+ 3/8*3 1/2 *1+ 3/8*3 1/2 *2+ 3/8*3
(mm) 9.52*2 9.52*3 12.7*1+9.5*3 12.7*1+9.5*2 12.7*2+9.5*3
in 1/4*2 1/4*3 1/4*4 1/4*4 1/4*5
(mm) 6.3*2 6.3*3 6.3*4 6.3*4 6.3*5
Long Line Applications,:
1. No change in line sizing is required.
2. Add refrigerant per Table 22.
Table 22 — Additional Charge Table Per Zone
Unit Size No. of Zones Charge oz. (kg.)
18 2 70.55 (2.0) 49 (15) 0.16 (15) 131 (40)
24 3 98.76 (2.8) 74 (22.5) 0.16 (15) 197 (60)
30 4 105.82 (3.0) 98 (30) 0.16 (15) 263 (80)
36 4 162.26 (4.6) 123 (37.5) 0.16 (15) 328 (100)
48 5 162.26 (4.6) 123 (37.5) 0.16 (15) 328 (100)
Additional Charge
Required After ft. (m)
Additional Charge
oz./ft. (g/m)
Total Maximum
Piping Length ft. (m.)
Additional Refrigerant Calculation
Sum Total Liquid Pipe ft. (m) - Additional Charge Required After ft. (m.) x Additional Charge oz./ft. (g/m) 0.16 (15)
NOTES:
If the calculation results in a negative number no additional refrigerant is required. Electronic expansion valves in the outdoor unit are
used as metering devices.
24 Specifications subject to change without notice. 38MGR-04SM
SYSTEM EVACUATION AND CHARGING
t
Low Side
High Side
A
B
C
D
500 microns
High side valve
Charge hose
Charge hose
Vacuum
500
MINUTES
01234 56 7
1000
1500
LEAK IN
SYSTEM
VACUUM TIGH
T
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 1500 MICRONS
EVACUATE TO 500 MICRONS MINIMUM (HOLD FOR 30 MINUTES)
RELEASE
CHARGE INTO SYSTEM BY O
PENING VALVES COMPLETELY
BREAK VACUUM WITH DRY NITROGEN TO 2 PSIG
EVACUATE TO 1000 MICRONS
BREAK VACUUM WITH DRY NITROGEN TO 2 PSIG
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. The alternate
triple evacuation method may be used if the following procedure is
followed. Always break a vacuum with dry nitrogen.
NOTE: All units (except the 18,000 BTU model) have a
Master Suction and Liquid Line Service Valve.
System Vacuum and Charge
Using Vacuum Pump
1. Completely tighten the flare nuts (A, B, C, D, E). Fully open all
circuits service valves. Connect the manifold gage charge hose to
the charge port of the low side Master service valve to evacuate all
circuits at the same time (see Fig. 23).
2. Connect charge hose to vacuum pump.
3. Fully open the low side of manifold gage (see Fig. 24).
4. Start vacuum pump
5. Evacuate using the triple evacuation method.
6. After evacuation is complete, fully close the low side of manifold
gage and stop operation of vacuum pump.
7. The factory charge contained in the outdoor unit is good for up
to 25ft. (8 m) of line length. For refrigerant lines longer than
25ft. (8 m), add refrigerant as specified in “Additional Charge
Table Per Zone” on page 24.
8. Disconnect charge hose from charge connection of the low side
service valve.
9. Securely tighten caps of service valves.
Outdoor Unit
Refrigerant
Indoor Uni
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 most
positive way of assuring a system is free of air and liquid water (see
Fig. 25).
Fig. 25 — Deep Vacuum Graph
Triple Evacuation Method
The triple evacuation method should be used. Refer to Fig. 26 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 hour.
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.
Service Valve
Fig. 23 — Service Valve
Manifold Gage
Low side valve
38MGR-04SM Specifications subject to change without notice. 25
Low side valve
Fig. 24 — Manifold
Fig. 26 — Triple Evacuation Method
pump
Final Tubing Check
IMPORTANT: Check to be certain factory tubing on both
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 feeder tubes, making sure wire
ties on feeder tubes are secure and tight.
ELECTRONIC FUNCTION
VOLTAGE
No limit
VOLT_LTM_FREQ1_ADD
VOLT_LTM_FREQ2_ADD
50
49
45
44
41
40
33
32
15
14
10
9
6
5
HeatT4Zone4I
HeatT4Zone3I
HeatT4Zone2I
HeatT4Zone1I
Abbreviation
• T1: Indoor ambient temperature
• T2: Middle indoor heat exchanger coil temperature
• T2B: Indoor heat exchanger exhaust coil temperature (located on
the outdoor unit)
• T3: Outdoor heat exchanger pipe temperature
• T4: Outdoor ambient temperature
• T5: Compressor discharge temperature
Electric Control Working Environment
• Input voltage: 230V
• Input power frequency: 60Hz
• Indoor fan standard working amp.: <1A
• Outdoor fan standard working amp.: <1.5A
• Four-way valve standard amp.: <1A
Main Protection
Compressor Restart Delay
The compressor takes one minute to start up the first time. Further
restarts take three minutes.
Compressor Discharge Temperature Protection
When the compressor’s discharge temperature rises, the running
frequency is limited according to the following rules:
• If 221°F (105°C)
frequency.
• If the temperature increases and T5
frequency to a lower level every two minutes until F1.
• If T5
239°F (115°C) for ten seconds, the compressor stops and
then restarts until T5<194°F (90°C).
Fan Speed Malfunction
If the outdoor fan speed is lower than 100RPM or higher than
2400RPM for 60 seconds or more, the unit stops and the LED displays
an E8 failure code.
Inverter Module Protection
The inverter protection module ensures that faults related to current,
voltage, or temperature do not damage the inverter.
Low Voltage Protection
T5<230°F (110°C), maintain the current
230°F, decrease the
Compressor Current Limit Protection
The temperature interval for the current limit is the same as the range
of the T4 frequency limit.
Fig. 28 — Cooling Mode
Table 23 — Cooling Mode
CoolReturnI
CoolT4Zone5I Cooling T4≥50
CoolT4Zone4I Cooling 49＞T4≥45
CoolT4Zone3I Cooling 44＞T4≥41
CoolT4Zone2I Cooling 40﹥T4≥33
CoolT4Zone1I Cooling 32＞T4
CoolStopI Cooling stop protection current value
Difference between current limit and
shutdown current
°C current limit value
°C current limit value
°C current limit value
°C current limit value
°C current limit value
Fig. 29 — Heating Mode
Table 24 — Heating Mode
Difference between current limit
and shutdown current
°C current limit value
°C current limit value
°C current limit value
Fig. 27 — Low Voltage Protection
If these protections are triggered, the A/C unit stops and the LED
displays the failure code. The unit restarts three minutes after the
protection mechanism turns off.
NOTE: If the low voltage protection triggers and the
voltage does not restore to normal within three
HeatReturnI
HeatT4Zone4I Heating T4≥15
HeatT4Zone3I Heating 14＞T4≥10
HeatT4Zone2I Heating 9＞T4≥6
HeatT4Zone1I Heating 5＞T4 current limit value
HeatStopI Heating stop protection current value
Indoor / Outdoor Units Communication Protection
If the indoor units do not receive the feedback signal from the outdoor
units for two consecutive minutes, the unit stops and displays a failure
code.
minutes, the protection remains active even after
the unit restarts.
26 Specifications subject to change without notice. 38MGR-04SM
High Condenser Coil Temperature Protection
Resume
Off
Decrease
Hold
3
1
1
e
c
a
4
2
0
2
3
0
1
f
d
b
T4FREMAXC0
T3
Table 25 — Cooling Mode
CAPACITY AREA a b c d e f
NORM CODE (N) 3 2 1.5 1 0.5 0
Table 26 — Cooling Mode
MODEL 9K 12K 18K 24K
HP 1.0 1.2 1.5 2.5
NOTE: The final result is an integer.
Fig. 30 — High Condenser Coil Temperature
Protection
Outdoor Unit Anti-Freezing Protection
When T2<39°F (4°C) for 250 seconds or T2< 32°F (0°C), the indoor
unit capacity demand is zero and resumes the normal operation when
T2>46.4°F (8°C) and the protection time is no less than three minutes.
Oil Return
Rules for Operation:
1. If the compressor frequency remains lower than the frequency set
for the setting time, the unit raises the frequency to the frequency
set for the setting time and then resumes the former frequency.
2. The EXV continues at 300p while the indoor units maintain their
operation. If the outdoor ambient temperature is higher than the set
frequency during the oil return, the unit stops the oil return process.
Low Outdoor Ambient Temperature Protection
When the compressor is off and T4 is lower than -31°F (-35°C) for ten
seconds, the unit stops and displays “LP.”
When the compressor is on and T4 remains lower than -40°F (-40°C)
for ten seconds, the unit stops and displays “LP.”
When T4 is no lower than -25.6°F(-32°C) for ten seconds, the unit
exits protection.
Controls and Functions
Use Table 27 and the final capacity request to confirm the operating
frequency.
Table 27 — Cooling Mode
Frequency
(Hz)
Amendatory
Capacity
Demand
The maximum running frequency is adjusted according to the outdoor
ambient temperature.
0 COOL_F1 COOL_F2
0 1 2
...
COOL_F24 COOL_F25
...
...
24 25
...
Capacity Request Calculation
Cooling Mode
T1 Ts
Fig. 32 — Maximum Running Frequency
Fig. 31 — Cooling Mode
38MGR-04SM Specifications subject to change without notice. 27
Heating Mode
4
0
a
3
1
ï1
3
1
2
0
b
c
d
e
f
2
Decrease frequency
Keep frequency
Increase frequenc
y
°C T2 average
47
40
no īo
Cool-F9
10S 30S
TimeA
10S
compressor
Indoor fan
Outdoor fan
EXV open
frequency
Max 10 minutes
frequency
Compressor stops
oī
oī
s042 rof P084 P084
T1 Ts
Fig. 33 — Heating Mode
Table 28 — Heating Mode
Capacity Area a b c d e f
Norm code (N) 3 2 1.5 1 0.5 0
Table 29 — Heating Mode
Model 9K 12K 18K 24K
HP 1.0 1.2 1.5 2.5
NOTE: The final result is an integer.
Modify the result according to a T2 average (correction).
NOTE: Average value of T2; sum of T2 value of all indoor
units)/(indoor units number).
Fig. 34 — T2 Average
Use Table 30 and the final capacity request to confirm the operating
frequency.
Table 30 — T2 Average
Frequency
(Hz)
Amendatory
Capacity
Demand
0 HEAT_F1 HEAT_F2
0 1 2
...
HEAT_F24 HEAT_F25
...
...
...
24 25
Fig. 35 — T2 Average
Defrosting Control
Defrosting Conditions
After the compressor starts and enters a normal operation, mark the
minimum value of T3 from the 10th to the 15th minute as T30.
If any one of the following conditions is satisfied, the unit enters the
Defrosting mode:
1. If the compressor’s cumulative running time reaches 29 minutes
and T3<TCDI1 and T3+T30SUBT3ONE ≦T30.
2. If the compressor cumulative running time reaches 35 minutes and
T3< TCDI2 and T3+ T30SUBT3TWO≦T30.
3. If the compressor cumulative running time reaches 40 minutes and
T3<
24°C for 3 minutes.
4. If the compressor cumulative running time reaches 120 minutes and
T3<
15°C.
Defrost Stop Conditions
If any of the following conditions is satisfied, defrosting ends and the
unit returns to the normal heating mode:
....T3 rises above than TCDE1°C
....T3 remains at TCDE2°C or above for 80 seconds
....Unit runs for ten consecutive minutes in DEFROSTING mode
Defrosting Actions
The maximum running frequency is adjusted according to the outdoor
ambient temperature.
28 Specifications subject to change without notice. 38MGR-04SM
Fig. 36 — Defrosting Action
End Defrosting Action
38
Exit low ambient cooling
mode
,
run with high fan
for 1 minute
Low
30
27
23
off
T3
°C
Increase fan speed
Keep current fan speed
Decrease fan speed
Fan stop
If any one of following items is satisfied, defrosting stops and the
machine enters the normal Heating mode.
1. T3 > TempQuitDefrost_ADD °C
2. The defrosting time achieves 10 minutes
3. Turn to other modes or OFF
Outdoor Fan Control
Cooling Mode
Under normal operating conditions, the system chooses the running
fan speed according to the ambient temperature.
Fig. 39 — Cooling Mode
Heating Mode
Under normal operating conditions, the system chooses a running fan
speed according to the ambient temperature.
Fig. 37 — Cooling Mode
When low ambient cooling is in effect:
The outdoor fan speed controls logic (low ambient cooling).
When T4 < 59.(15°C) and T3 < 86.(30°C), the unit enters into the
Fig. 40 — Heating Mode
low ambient cooling mode. The outdoor fan chooses a speed
according to T3.
When T3≥100.4.(38°C) or when T4≥68.(20°C), the outdoor fan
chooses a speed according to T4 again.
Electronic Expansion Valve (EXV) Control
1. EXV is fully closed when power is turned on. The EXV will
standby with the 350P open and then opens to the target angle after
the compressor starts.
2. EXV closes with - 160P when the compressor stops. Then EXV
will standby with the 350P open and then opens to the target angle
after the compressor starts.
3. The action priority of the EXVs is A-B-C-D-E.
4. Compressor and the outdoor fan start operation only after the EXV
is initialized.
Cooling Mode
The initial open angle of EXV is dependent on indoor model size,
adjustment range is 100-400p. When the unit starts to work for three
minutes, the outdoor unit receives the indoor units’ (of capacity
demand) T2B information and calculates their average.
After comparing each indoor T2B with the average. the outdoor gives
Fig. 38 — Cooling Mode
the following modification commands: if the T2B>average, the
relevant valve needs more 16p open. If the T2B = average, the
relevant valve’s open range remains. If the T2B<average, the relevant
valve needs more 16p close. This modification will be carried out
every two minutes.
38MGR-04SM Specifications subject to change without notice. 29
Heating Mode
The initial open angle of EXV is 250P, dependent on indoor model
size, adjustment range is 100-400p. After the unit works for three
minutes, the outdoor unit receives the indoor units (of capacity
demand) T2 information and calculates the their average. After
comparing each indoor units’ T2 with the average, the outdoor unit
gives the following modification commands.
If the T2<average +2, the relevant valve needs more 16p close. If
average +2
remains. If the T2< average.2, the relevant valve needs more 16p
open. This modification occurs every two minutes.
≥the T2≥ average.2, the relevant valve’s open range
Four-way valve control
In Heating mode, the four-way valve opens. In Defrosting mode, the
four.way valve operates in accordance to the Defrosting action. In
other modes, the four-way valve is closed.
When the Heating mode changes to other modes, the four-way valve
closes after the compressor is off for two minutes. Failure or
protection (not including discharge temperature protection, high and
low pressure protection), the four-way valve immediately shuts down.
30 Specifications subject to change without notice. 38MGR-04SM
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