mundoclima H6M SERIE User manual

www.mundoclima.com
CL20440 to CL20452
MULTI INVERTER SERIE H6M
English
Thank you very muchfor purchasing our products.
Please read thismanual carefully beforeinstalling
and using the unit.
Service manual

CONTENTS
1. General information of Outdoor Units ..........................................3
2. Features..........................................................................................4
3. Dimensions.....................................................................................5
4. Refrigeration Cycle Diagram.........................................................6
5. Wiring diagram...............................................................................8
6. Indoor units combination............................................................11
7. Sound Levels................................................................................13
8. Installation Details........................................................................14
8.1 Wrench torque sheet for installation.......................................................................................... 14
8.2 Connecting the cables............................................................................................................... 14
8.3 Pipe length and the elevation.................................................................................................... 14
8.4 Installation for the first time........................................................................................................ 15
8.5 Adding the refrigerant after running the system for many years............................................... 19
8.6 Re-installation while the indoor unit need to be repaired.......................................................... 20
8.7 Re-installation while the outdoor unit need to be repaired........................................................ 22
9. Electronic control function ........................................................24
10. Troubleshooting........................................................................29

1. General information of Outdoor Units
Model name Dimension (mm) Compressor
MUEX-14-H6.2 800x333x554 ASN108D22UEZ
MUEX-18-H6.2 800x333x554 ASM135D23UFZ
MUEX-21-H6.3 845x363x702 ASM135D23UFZ
MUEX-27-H6.3 845x363x702 ATF235D22UMT
MUEX-28-H6.4 946x410x810 ATF235D22UMT
MUEX-36-H6.4 946x410x810 ATF310D43UMT
MUEX-42-H6.5 946x410x810 ATF310D43UMT
3

2. Features
The hydrophilic fin can improve the heating efficiency at operation mode.
It protects the valves and prevents water from dripping.
4 way valve control
It is only operated in the heating operation mode except defrosting operation.
Outdoor unit
Power relay control
Hydrophilic aluminum fin
Anti-rust cabinet
Valve protection cover
Low noise air flow system
Discharge pipe temperature protection
4

3. Dimensions
A
B
D
Model Unit: mm
W D H W1 A B
MUEX-14-H6.2 800 333 554 860 514 340
MUEX-18-H6.2 800 333 554 860 514 340
MUEX-21-H6.3 845 363 702 923 540 350
MUEX-27-H6.3 845 363 702 923 540 350
MUEX-28-H6.4 946 410 810 1034 673 403
MUEX-36-H6.4 946 410 810 1034 673 403
MUEX-42-H6.5 946 410 810 1034 673 403
5

4. Refrigeration Cycle Diagram
4.1 Refrigeration circuit drawing of inverter 1 drive 2 type
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
INDOOR OUTDOOR
EXV ACAPILIARY A
CHECK VALVE
CAPILIARY TUBE
EXV BCAPILIARY B
LIQUID VALVE B
GAS VALVE B
Accumulator
T2B-A Evaporator
temp. sensor outlet
T2B-B
4.2 Refrigeration circuit drawing of inverter 1 drive 3 type
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
INDOOR OUTDOOR
EXVA CAPILIARY A
CHECK VALVE
CAPILIARY TUBE
EXVB CAPILIARY B
LIQUID VALVE B
GAS VALVE B
EXV CCAPILIARY C
LIQUID VALVE C
GAS VALVE C Accumulator
T2B-A Evaporator
temp. sensor outlet
T2B-B
T2B-C
6

4.3 Refrigeration circuit drawing of inverter 1 drive 4 type
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR) HEAT
EXCHANGE
(CONDENSER)
Compressor
4-WAY VALVE
COOLING
HEATING
T2Evaporator
temp. sensor
middle
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T5 Discharge
temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
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
4.4 Refrigeration circuit drawing of inverter 1 drive 5 type
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR) HEAT
EXCHANGE
(CONDENSER)
COOLING
HEATING
T2 Evaporator
temp. sensor
middle
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
EXV A CAPILIARY A
CHECK VALVE
CAPILIARY TUBE
EXV B CAPILIARY B
LIQUID VALVE B
GAS VALVE B
EXV CCAPILIARY C
LIQUID VALVE C
GAS VALVE C
EXV DCAPILIARY 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
T2B-A Evaporator
temp. sensor outlet
T2B-B
T2B-C
T2B-D
T2B-E
7

5. Wiring diagram
MUEX-14-H6.2 / MUEX-18-H6.2
MUEX-21-H6.3 / MUEX-27-H6.3
4-WAY
DC-FAN
CN 7
3
ELECTRONIC
EXPANSION
VALVE
5/6
CN 31
PAN
HEATER
CN 15
OPTIONAL
CN 60
CRANKCASE
HEATER
CN 17
OPTIONAL
BLUE
BROWN
BLACK
L
S
N
AMBIENT TEMP. SENSOR
DISCHARGE TEMP. SENSOR
CN 21
CONDENSER TEMP. SENSOR
Y/G
CN 1A
Y/G
COMPRESSOR
Y/G
CN 50
3
UVW
BLUE
RED
BLACK
S(B)
N(A)
N(B) L(B) L
L(A) N
S(A)
5/6
CN 4
CN 2
CN 7
CN 3
ELECTRONIC
EXPANSIVE
VALVE
TESTPORT
CN 1-3
CN 1-1
CN 1-2
INDOOR PIPE
OUT TEMP
VALVE-B
VALVE-A
B
A
POWER
SUPPLY
TO B
TO A
S(2)
S(1)
NOTE:
S(1);S(2)
NO USED
16022300001333
OPTIONAL
OPTIONAL
COMPRESSOR
CN1
U(R)
V(S)
W(C)
ELECTRONIC
EXPANSIVE
VALVE
BLUE
BLACK
UVW
CN7
VALVE-A
INDOOR PIPE
OUT TEMP
MAIN BOARD
CN19
CN17
T4
T3
P-1
RED
DISCHARGE SENSOR
CN18
VALVE-B
COM(3)
RY2
ON(4)
CN29
CN21
CN15
T2B
AB
CN14
LOW/HIGH
CN12
CompTop
YELLOW
RED
LOW PRESSURE PROTECT
HIGH PRESSURE PROTECT
4
CN4
CN5
~~
IPM BOARD
5
RED(BROWN)
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
OUTDOOR AMBIENT
TEMPERATURE SENSOR
CONDENSER
TEMPERATURE SENSOR
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
3
ELECTRONIC
EXPANSIVE
VALVE
3
6
P-2
CN22
VALVE-C
ELECTRONIC
EXPANSIVE
VALVE
6
C
L-IN N-IN
CN25 CN23
S-A S-B
CN3 CN4
BLACK
BLUE
BROWN
BLACK
RED
S-C
CN20
LN
POWER
TO A
SUPPLY
Y/G
BROWN
BROWN
BLUE
BLUE BLACK
BLACK
Y/G
TO B TO C
Y/G
L(A)
S(A)
N(A)
L(A)
S(A)
N(A) L(B)
S(B)
N(B) L(C) N(C)
S(C)
Y/G
16022300000913
8

MUEX-28-H6.4
MUEX-36-H6.4
COMPRESSOR
CN1
U(R)
V(S)
W(C)
ELECTRONIC
EXPANSIVE
VALVE
BLUE
BLACK
UVW
CN7
VALVE-A
INDOOR PIPE
OUT TEMP
MAIN BOARD
CN19
CN17
T4
T3
P-1
RED
DISCHARGE SENSOR
CN18
VALVE-B
COM(3)
RY2
ON(4)
CN29
CN21
CN15
T2B
AB
CN14
LOW/HIGH
CN12
CompTop
YELLOW
RED
LOW PRESSURE PROTECT
HIGH PRESSURE PROTECT
4
CN4
CN5
~~
IPM BOARD
5
RED(BROWN)
BLUE
Y/G
D
CN24
VALVE-D
L-OUT
Y/G
CN6 CN5
HEATER1
HEAT1
CN1 CN2
4-WAY
4-WAY
HEATER2
OPTIONAL
CN9 CN8
HEAT2
CN2 CN3
REACTOR
BLUE BLUE
OUTDOOR AMBIENT
TEMPERATURE SENSOR
CONDENSER
TEMPERATURE SENSOR
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
3
ELECTRONIC
EXPANSIVE
VALVE
ELECTRONIC
EXPANSIVE
VALVE
3
6
6
P-2
L-IN N-IN
CN25 CN23
S-A S-B
CN3 CN4
BLACK
BLUE
BROWN
BLACK
RED
S-C
CN20
LN
POWER
TO A
SUPPLY
Y/G
BROWN
BROWN
BLUE
BLUE BLACK
BLACK
Y/G
TO B TO C
Y/G
L(A)
S(A)
N(A)
L(A)
S(A)
N(A) L(B)
S(B)
N(B) L(C) N(C)
S(C)
S-D
CN16
L(D) N(D) S(D)
BROWNBROWN
BLUE
BLACK
TO D
Y/G
Y/G
CN22
VALVE-C
ELECTRONIC
EXPANSIVE
VALVE
6
C
16022300000803
COMP
FM1
MAIN BOARD
RED
BLACK
U
V
W
Y/G
Y/G
L
L-PRO
T3
T4
H-PRO
Y/G
TP
V
U
CN19
CN51
CN55
W
EEV
BLACK
DRIVER BOARD
RED
7
7
YELLOW
BLUE
P-1
CN53
CN3
CN4
CN10
CN40
CN22
CN44
CN8 CN9 CN7
CN2
CN1
CN5
CN54
CN52
3
CN33
CN6
SV 4-WAY1
BLUE
BLUE
HEAT_D
HEAT_Y
OPTIONAL
OPTIONAL
3
BLACK
RED
BLUE
BLUE
BLUE
YELLOW
RED
BLACK
RED
BLACK
CN20 M
5(6)
A
CN21 M
5(6)
B
CN17 M
5(6)
C
CN19 M
5(6)
E
CN18 M
5(6)
D
CN30
CN29
CN28
CN27
T2B-A B C D E
CN13
INDOOR PIPE OUT TEMP A B C D E
L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D)
BROWN
BROWN
BLUE
BLUE
BLACK
BLACK
CODE PART NAME
COMPRESSOR
HEAT
4-WAY VALVE
COMP
CAP1
EEV ELECTRIC EXPANSIVE
VALVE
OUTDOOR AC FAN
FAN1
H-PRO
L-PRO
LOW PRESSURE SWITCH
HIGH PRESSURE SWITCH
T3
T4
CONDENSER
TEMPERATURE SENSOR
OUTDOOR AMBIENT
TEMPERATURE SENSOR
CRANKCASE HEATING
SV
L
PFC INDUCTOR
TH
HEATSINK
TEMPERATURE SENSOR
TP
EXHAUST
TEMPERATURE SENSOR
FM1 OUTDOOR DC FAN
FAN MOTOR CAPACITOR
PART NAMECODE
BLUE BLUE
RDE
BLACK
BLACK
RDE
BROWN
BLUE
BLACK
BROWN
BLUE
BLACK
DR BOARD
CN1
CN5
CN2
4
RJ45
FOR USER
TO CONNECT
CN16
OPTIONAL
POWER
L
N
SUPPLY
L(A) N(A) S(A)
Y/G
TO B
Y/G
TO A
Y/G
TO C
Y/G
TO D
OPTIONAL
9

MUEX-42-H6.5
COMP
FM1
MAIN BOARD
RED
BLACK
U
V
W
Y/G
Y/G
L
L-PRO
T3
T4
H-PRO
Y/G
TP
V
U
CN19
CN51
CN55
W
EEV
BLACK
DRIVER BOARD
RED
7
7
YELLOW
BLUE
P-1
CN53
CN3
CN4
CN10
CN40
CN22
CN44
CN8 CN9 CN7
CN2
CN1
CN5
CN54
CN52
3
CN33
CN6
SV 4-WAY1
BLUE
BLUE
HEAT_D
HEAT_Y
OPTIONAL
OPTIONAL
3
BLACK
RED
BLUE
BLUE
BLUE
YELLOW
RED
BLACK
RED
BLACK
CN20 M
5(6)
A
CN21 M
5(6)
B
CN17 M
5(6)
C
CN19 M
5(6)
E
CN18 M
5(6)
D
CN29
CN28
CN27
CN26
T2B-A B C D E
CN13
INDOOR PIPE OUT TEMP A B C D E
L(C) N(C) S(C) L(D) N(D) S(D) L(E) N(E) S(E)
BROWN
BROWN
BLUE
BLUE
BLACK
BLACK
CODE PART NAME
COMPRESSOR
HEAT
4-WAY VALVE
COMP
CAP1
EEV ELECTRIC EXPANSIVE
VALVE
OUTDOOR AC FAN
FAN1
H-PRO
L-PRO
LOW PRESSURE SWITCH
HIGH PRESSURE SWITCH
T3
T4
CONDENSER
TEMPERATURE SENSOR
OUTDOOR AMBIENT
TEMPERATURE SENSOR
CRANKCASE HEATING
SV
L
PFC INDUCTOR
TH
HEATSINK
TEMPERATURE SENSOR
TP
EXHAUST
TEMPERATURE SENSOR
FM1 OUTDOOR DC FAN
FAN MOTOR CAPACITOR
PART NAMECODE
BLUE BLUE
RDE
BLACK
BLACK
RDE
CN30
POWER
L
N
L(B) N(B) S(B) L(A) N(A) S(A)
BROWN
BLUE
BLACK
BROWN
BLUE
BLACK
BROWN
BLUE
BLACK
DR BOARD
CN1
CN5
CN2
4
RJ45
FOR USER
TO CONNECT
CN16
OPTIONAL
Y/G
TO B
Y/G
TO C
Y/G
TO E
Y/G
TO A
Y/G
TO D
OPTIONAL
10

6. Indoor units combination
6.1 Indoor unit combination for MUEX-14-H6.2
One unit Two unit
7 7+7 9+9
9 7+9 9+12
12 7+12
18
6.2 Indoor unit combination for MUEX-18-H6.2
One unit Two unit
7 7+7 9+9
9 7+9 9+12
12 7+12 9+18
18 7+18 12+12
6.3 Indoor unit combination for MUEX-21-H6.3
One unit Two unit Three unit
7 7+7 9+9 7+7+7 7+9+12
9 7+9 9+12 7+7+9 9+9+9
12 7+12 9+18 7+7+12 9+9+12
18 7+18 12+12 7+9+9 7+12+12
6.4 Indoor unit combination for MUEX-27-H6.3
One unit Two unit Three unit
7 7+7 9+9 12+18 7+7+7 7+9+9 7+12+18 9+12+12
9 7+9 9+12 18+18 7+7+9 7+9+12 9+9+9 9+12+18
12 7+12 9+18 7+7+12 7+9+18 9+9+12 12+12+12
18 7+18 12+12 7+7+18 7+12+12 9+9+18
6.5 Indoor unit combination for MUEX-28-H6.4
One unit Two unit Three unit Four unit
7 7+7 9+9 12+18 7+7+7 7+9+9 7+12+18 9+12+18 7+7+7+7 7+7+9+9 7+9+9+12
9 7+9 9+12 12+24 7+7+9 7+9+12 9+9+9 12+12+12 7+7+7+9 7+7+9+12 7+9+12+12
12 7+12 9+18 18+18 7+7+12 7+9+18 9+9+12 12+12+18 7+7+7+12 7+7+9+18 9+9+9+9
18 7+18 12+12 7+7+18 7+9+24 9+9+18 7+7+7+18 7+7+12+12 9+9+9+12
24 7+24 9+24 7+7+24 7+12+12 9+12+12 7+9+9+9
11

6.6 Indoor unit combination for MUEX-36-H6.4
6.7 Indoor unit combination for MUEX-42-H6.5
One Unit
Two Unit
Three Unit
7
7+7
9+18
7+7+7
7+9+18
9+9+12
12+12+12
9
7+9
9+24
7+7+9
7+9+24
9+9+18
12+12+18
12
7+12
12+12
7+7+12
7+12+12
9+9+24
12+12+24
18
7+18
12+18
7+7+18
7+12+18
9+12+12
12+18+18
24
7+24
12+24
7+7+24
7+12+24
9+12+18
9+9
18+18
7+9+9
7+18+18
9+12+24
9+12
7+9+12
9+9+9
9+18+18
Four Unit
7+7+7+7
7+7+9+18
7+9+9+12
7+12+12+12
9+9+12+12
7+7+7+9
7+7+9+24
7+9+9+18
7+12+12+18
9+9+12+18
7+7+7+12
7+7+12+12
7+9+9+24
7+12+12+24
9+9+12+24
7+7+7+18
7+7+12+18
7+9+12+12
9+9+9+9
9+12+12+12
7+7+7+24
7+7+12+24
7+9+12+18
9+9+9+12
9+12+12+18
7+7+9+9
7+7+18+18
7+9+12+24
9+9+9+18
12+12+12+12
7+7+9+12
7+9+9+9
7+9+18+18
9+9+9+24
12+12+12+18
Five Unit
7+7+7+7+7
7+7+7+9+18
7+7+9+9+24
7+9+9+12+12
9+9+9+12+12
7+7+7+7+9
7+7+7+9+24
7+7+9+12+18
7+9+9+12+18
9+9+9+12+18
7+7+7+7+12
7+7+7+12+18
7+7+12+12+12
7+9+12+12+12
9+9+12+12+12
7+7+7+7+18
7+7+7+18+18
7+7+12+12+18
7+9+12+12+18
9+12+12+12+12
7+7+7+7+24
7+7+9+9+9
7+9+9+9+9
9+9+9+9+9
9+12+12+12+18
7+7+7+9+9
7+7+9+9+12
7+9+9+9+12
9+9+9+9+12
12+12+12+12+12
7+7+7+9+12
7+7+9+9+18
7+9+9+9+18
9+9+9+9+18
One unit
Two unit
Three unit
Four unit
7
7+7
9+18
7+7+7
7+9+18
9+9+12
12+12+12
7+7+7+7
7+7+9+24
7+9+12+12
9+9+12+12
9
7+9
9+24
7+7+9
7+9+24
9+9+18
12+12+18
7+7+7+9
7+7+12+12
7+9+12+18
9+9+12+18
12
7+12
12+12
7+7+12
7+12+12
9+9+24
12+12+24
7+7+7+12
7+7+12+18
7+9+18+18
9+12+12+12
18
7+18
12+18
7+7+18
7+12+18
9+12+12
12+18+18
7+7+7+18
7+7+18+18
7+12+12+12
9+12+12+18
24
7+24
12+24
7+7+24
7+12+24
9+12+18
7+7+7+24
7+9+9+9
7+12+12+18
12+12+12+12
9+9
18+18
7+9+9
7+18+18
9+12+24
7+7+9+9
7+9+9+12
9+9+9+9
12+12+12+18
9+12
7+9+12
9+9+9
9+18+18
7+7+9+12
7+9+9+18
9+9+9+12
7+7+9+18
7+9+9+24
9+9+9+18
12

7. Sound Levels
H
1.0m
Outdoor Unit
Microphone
Note: H= 0.5 × height of outdoor unit
Model
Noise Power dB(A)
Noise level dB(A)
MUEX-14-H6.2
MUEX-18-H6.2
65
56.5
MUEX-21-H6.3
65
57.5
MUEX-27-H6.3
68
59.5
MUEX-28-H6.4
66
60
MUEX-36-H6.4
68
63.5
MUEX-42-H6.5
68
62
13

8. Installation Details
8.1 Wrench torque sheet for installation
Outside diameter
Torque
Additional tightening torque
mm
N.cm
N.cm
Ф6.35
1500(153kgf.cm)
1600(163kgf.cm)
Ф9.52
2500(255kgf.cm)
2600(265kgf.cm)
Ф12.7
3500(357kgf.cm)
3600(367kgf.cm)
8.2 Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Rated current of appliance
Nominal cross-sectional area (mm²)
>3 and ≤6
0.75
>6 and ≤10
1
>10 and ≤16
1.5
>16 and ≤25
2.5
The cable size and the current of the fuse or switch are determined by the maximum current indicated on the
nameplate which located on the side panel of the unit. Please refer to the nameplate before selecting the
cable, fuse and switch.
8.3 Pipe length and the elevation
Maximum piping length and height difference
1 drive 2
1 drive 3
1 drive 4
1 drive 5
Max. length for all rooms (m)
30
45
60
75
Max. length for one IU (m)
20
25
30
30
Max. height difference
between IU and OU (m)
OU higher than IU
10
10
10
10
OU lower than IU
15
15
15
15
Max. height difference between IUs (m)
10
10
10
10
Additional refrigerant charge
1 drive 2
1 drive 3
1 drive 4
1 drive 5
Chargeless pipe
length (m)
10
15
20
25
Additional
refrigerant charge
(g)
15 x (length for all
rooms - 10)
15 x (length for all
rooms - 15)
15 x (length for all
rooms - 20)
15 x (length for all
rooms - 25)
Caution:
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●Refrigerant pipe diameter is different according to indoor unit to be connected. When using the
extension pipe, refer to the tables below.
●When refrigerant pipe diameter is different from that of outdoor unit union (for 18K indoor unit), additional
transfer connector needs to be used on outdoor unit union.
Indoor unit
Extension pipe diameter (mm/inch)
Model
Pipe diameter (mm/inch)
7K9K12K
Liquid
6.35(1/4)
Liquid
6.35(1/4)
Gas
9.52(3/8)
Gas
9.52(3/8)
18K
Liquid
6.35(1/4)
Liquid
6.35(1/4)
Gas
12.7(1/2)
Gas
12.7(1/2)
24K
Liquid
9.52(3/8)
Liquid
9.52(3/8)
Gas
15.9(5/8)
Gas
15.9(5/8)
Outdoor unit union diameter (mm/inch)
Indoor unitA/B/C/D/E
Liquid
6.35(1/4)
Gas
9.52(3/8)
12.7(1/2)
8.4 Installation for the first time
Air and moisture in the refrigerant system have undesirable effects as below:
●Pressure in the system rises.
●Operating current rises.
●Cooling or heating efficiency drops.
●Moisture in the refrigerant circuit may freeze and block capillary tubing.
●Water may lead to corrosion of parts in the refrigerant system.
Therefore, the indoor units and the pipes between indoor and outdoor units must be leak tested and
evacuated to remove gas and moisture from the system.
Gas leak check (Soap water method):
Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor unit
connections by a soft brush to check for leakage of the connecting points of the piping. If bubbles come out,
the pipes have leakage.
1. Air purging with vacuum pump
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1) Completely tighten the flare nuts of the indoor and outdoor units, confirm that both the 2-way and 3-way
valves are set to the closed position.
2) Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port..
3) Connect the charge hose of handle hi connection to the vacuum pump.
4) Fully open the handle Lo of the manifold valve.
5) Operate the vacuum pump to evacuate.
6) Make evacuation for 30 minutes and check whether the compound meter indicates -0.1Mpa. If
the meter does not indicate -0.1Mpa after pumping 30 minutes, it should be pumped 20 minutes more. If the
pressure can’t achieve -0.1Mpa after pumping 50 minutes, please check if there are some leakage points.
Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump. Confirm
that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).
7) Turn the flare nut of the 3-way valves about 45° counterclockwise for 6 or 7seconds after the gas
coming out, then tighten the flare nut again. Make sure the pressure display in the pressure indicator is a
little higher than the atmosphere pressure. Then remove the charge hose from the 3 way valve.
8) Fully open the 2 way valve and 3 way valve and securely tighten the cap of the 3 way valve.
(Indoor unit)
(Liquid side)
(Gas side)
Vacuum
pump
Vacuum
pump
Lo
Hi
Handle Hi
Two-way valve
Close
Manifold valve
Compound meter
Pressure
gauge
-0.1MPa
Handle Lo
Charge hose
Charge hose
(Outdoor unit)
Close
Three-way valve
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2. Air purging by refrigerant
Procedure:
1). Confirm that both the 2-way and 3-way valves are set to the closed position.
2). Connect the charge set and a charging cylinder to the service port of the 3-way valve.
3).Air purging.
Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut on the
2-way valve approximately 45’ for 3 seconds then closing it for 1 minute; repeat 3 times.
After purging the air, use a torque wrench to tighten the flare nut on the 2-way valve.
4). Check the gas leakage.
Check the flare connections for gas leakage.
5). Discharge the refrigerant.
Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the
2-way valve approximately 45’ until the gauge indicates 0.3 to 0.5 Mpa.
6). Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open
position.
Be sure to use a hexagonal wrench to operate the valve stems.
7). Mount the valve stems nuts and the service port cap.
Be sure to use a torque wrench to tighten the service port cap to a torque 18N·m.
Be sure to check the gas leakage.
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3. Adding the refrigerant if the pipe length >5m
Procedure:
1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve.
Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the
cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure the liquid charge.
2). Purge the air from the charge hose.
Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be
careful of the liquid refrigerant).
3) Put the charging cylinder onto the electronic scale and record the weight.
4) Operate the air conditioner at the cooling mode.
5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.
6).When the electronic scale displays the proper weight (refer to the table), disconnect the charge hose from
the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the hose.
7). Mount the valve stem caps and the service port
Use torque wrench to tighten the service port cap to a torque of 18N.m.
Be sure to check for gas leakage.
Electronic scale
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8.5 Adding the refrigerant after running the system for many years
Procedure:
1). Connect the charge hose to the 3-way service port, open the 2-way valve and the 3-way valve.
Connect the charge hose to the valve at the bottom of the cylinder. If the refrigerant is R410A, make the
cylinder bottom up to ensure liquid charge.
2). Purge the air from the charge hose.
Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be
careful of the liquid refrigerant).
3) Put the charging cylinder onto the electronic scale and record the weight.
4) Operate the air conditioner at the cooling mode.
5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.
6).When the electronic scale displays the proper weight (refer to the gauge and the pressure of the low side),
disconnect the charge hose from the 3-way valve’s service port immediately and turn off the air conditioner
before disconnecting the hose.
7). Mount the valve stem caps and the service port
Use torque wrench to tighten the service port cap to a torque of 18N.m.
Be sure to check for gas leakage.
Electronic scale
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8.6 Re-installation while the indoor unit need to be repaired
1. Collecting the refrigerant into the outdoor unit
Procedure
1). Confirm that both the 2-way and 3-way valves are set to the opened position
Remove the valve stem caps and confirm that the valve stems are in the opened position.
Be sure to use a hexagonal wrench to operate the valve stems.
2). Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port.
3).Air purging of the charge hose.
Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and
then close it quickly.
4). Set the 2-way valve to the close position.
5). Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa.
6). Set the 3-way valve to the closed position immediately
Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa.
Disconnect the charge set, and tighten the 2-way and 3-way valve’s stem nuts.
Use a torque wrench to tighten the 3-way valves service port cap to a torque of 1.8 kgf.m.
Be sure to check for gas leakage.
20