Fisher FS2MIF-141AE2 User manual

SERVICE MANUAL
Room Air Conditioner
DC Inverter Multi Split Outdoor
units
FS2MIF-141AE2
FS2MIF-181AE2
FS3MIF-211AE2
FS3MIF-271AE2
FS4MIF-281AE2
FS4MIF-361AE2
FS5MIF-421AE0
NOTE:
Before servicing the unit, please read this at first.
Always contact with your service center if meet problem.
FI_SM_MULTI OUTDOOR FS2-3-4-5MIF--1AE2_161205

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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
9. Electronic control function............................................24
10. Troubleshooting............................................................29

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1. General information of Outdoor Units
Model name Dimension (mm) Compressor
800x333x554 ASN108D22UEZ
800x333x554 ASM135D23UFZ
845x363x702 ASM135D23UFZ
845x363x702 ATF235D22UMT
946x410x810 ATF235D22UMT
946x410x810 ATF310D43UMT
946x410x810 ATF310D43UMT
FS2MIF-141AE2
FS2MIF-181AE2
FS3MIF-211AE2
FS3MIF-271AE2
FS4MIF-281AE2
FS4MIF-361AE2
FS5MIF-421AE0
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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-

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3. Dimensions
A
B
D
Model Unit：mm
W D H W1 A B
800 333 554 860 514 340
800 333 554 860 514 340
845 363 702 923 540 350
845 363 702 923 540 350
946 410 810 1034 673 403
946 410 810 1034 673 403
FS2MIF-141AE2 FS2MIF-181AE2
FS2MIF-141AE2
FS2MIF-181AE2
FS3MIF-211AE2
FS3MIF-271AE2
FS4MIF-281AE2
FS4MIF-361AE2
946 410 810 1034 673 403
FS5MIF-421AE0
-5-

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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 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
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
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
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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
T2 Evaporator
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 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
T2B-A Evaporator
temp. sensor outlet
T2B-B
T2B-C
T2B-D
T2B-E
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5. Wiring diagram
FS2MIF-141AE2 FS2MIF-181AE2
FS3MIF-211AE2 FS3MIF-271AE2
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FS4MIF-281AE2
FS4MIF-361AE2
-9-

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FS5MIF-421AE0
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6. Indoor units combination
6.1 Indoor unit combination for
One unit Two unit
7+7 9+9
7+9 9+12
7+12
6.2 Indoor unit combination for
One unit Two unit
7+7 9+9
7+9 9+12
18 7+18 12+12
6.3 Indoor unit combination for
One unit Two unit Three unit
6.4 Indoor unit combination for
One unit Two unit Three unit
6.5 Indoor unit combination for
One unit Two unit Three unit Four unit
FS2MIF-141AE2
FS2MIF-181AE2
7+12 9+18
FS3MIF-211AE2
FS3MIF-271AE2
FS4MIF-281AE2
7+18
9+12
9+18
12+12
12+18 7+7+7
7+7+9
7+7+12
7+9+9
7+9+12
9+9+9
9+9+12
7+18
9+12
9+18
12+12
12+18
18+18
7+7+7
7+7+9
7+7+12
7+7+18
7+9+9
7+9+12
7+9+18
7+12+12
7+12+18
9+9+9
9+9+12
9+9+18
9+12+12
9+12+18
12+12+12
7+18
7+24
9+18
9+24
12+18
12+24
18+18 7+7+12
7+7+18
7+7+24
7+9+9
7+9+12
7+9+18
7+12+12
7+9+24
7+12+18
9+9+9
9+9+18
9+9+12
9+12+12
9+12+18
12+12+12
7+7+7
7+7+7+9
7+7+7+12
7+7+7+18
7+7+9+9
7+7+9+12
7+7+12+12
7+9+9+9
7+9+9+12
7+9+12+12
9+9+9+9
9+9+9+12
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6.7 Indoor unit combination for
One Unit Two Unit Three Unit
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7+9+24
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12+12+18
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9+9+24
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12+12+24
 
12+18+18
7+12+249+12+18
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7+18+189+12+24
18+24
9+18+18
Four Unit
7+7+9+18

7+12+12+12
9+9+12+12
7+7+9+24
7+9+9+18
7+12+12+18
9+9+12+18
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+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+18+18
7+9+12+24
9+9+9+18
12+12+12+12

7+9+18+18
9+9+9+24
12+12+12+18
Five Unit
7+7+7+9+18
7+7+9+9+24
7+9+9+12+12
9+9+9+12+12
7+7+7+9+24
7+7+9+12+12
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
9+9+9+9+9

7+7+7+9+9
7+7+9+9+12
9+9+9+9+12
12+12+12+12+12
7+7+7+9+12
7+7+9+9+18
9+9+9+9+18
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O
ne unit Two unit Three unit Four unit
12+12+12
7+7+7+7 7+7+9+24 7+9+12+12 9+9+12+12
12+12+18
7+7+7+9 7+7+12+12 7+9+12+18 9+9+12+18
12+12+24
7+7+7+12 7+7+12+18 7+9+18+18 9+12+12+12
12+18+18
7+7+7+18 7+7+18+18 7+12+12+12 9+12+12+18
7+7+7+24 7+9+9+9 7+12+12+18 12+12+12+12
7+7+9+9 7+9+9+12 9+9+9+9 12+12+12+18
7+7+9+12 7+9+9+18 9+9+9+12
7+9+9+24 9+9+9+18
6.6 Indoor unit combination for FS4MIF-361AE2
FS5MIF-421AE0
7+24
9+24
12+18
12+24
18+18
7+7+18
7+7+24
7+9+12
7+9+18
7+9+24
7+12+12
7+12+18
7+12+24
7+18+18
9+9+12
9+9+18
9+12+12
9+12+18
9+12+24
9+9+24
9+18+18
7+7+9+18
24+24
7+18+24
9+18+24
12+18+24
18+18+18
7+7+18+24 7+9+18+24
7+12+18+18
9+12+12+24
9+12+18+18
12+12+12+24
12+12+18+18
7+7+7+12+12
7+7+7+12+24
7+7+9+12+18
7+7+9+12+24
7+7+9+18+18
7+12+12+12+12
9+9+9+9+24

7+9+9+9+9
7+9+9+9+12
7+9+9+9+18
7+9+9+9+24

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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)
FS2MIF-141AE2
FS2MIF-181AE2
FS3MIF-211AE2
FS3MIF-271AE2
FS4MIF-281AE2
FS4MIF-361AE2
FS5MIF-421AE0
65
65
68
66
68
68
56,5
57,5
59,5
60
63.5
62
60 54
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8. Installation Details
7.1 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)
7.2 Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Model Nominal cross-sectional area (mm²)
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.
7.3 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:
FS2MIF-141AE2 FS2MIF-181AE2
FS3MIF-211AE2 FS3MIF-271AE2
FS4MIF-281AE2
FS4MIF-361AE2 FS5MIF-421AE0
3 x 2,5
3 x 4,0
3 x 2,5
3 x 2,5
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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 unit A/B/C/D/E
Liquid 6.35(1/4)
Gas
9.52(3/8)
12.7(1/2)
7.4 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.
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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 mete
r
Pressure
gauge
-0.1MPa
Handle Lo
Charge hose Charge hose
(Outdoor unit)
Close
Three-way valve
1. Air purging with vacuum pump
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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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7.5 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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7.6 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.