Fisher FSAI-SU-91AE2 User manual

SERVICE MANUAL
Room Air Conditioner
Split Wall-Mounted Type
FSAI-SU-91AE2 / FSOAI-SU-91AE2
FSAI-SU-121AE2 / FSOAI-SU-121AE2
FSAIF-SU-181AE2 / FSOAIF-SU-181AE2
FSAIF-SU-241AE2 / FSOAIF-SU-241AE2
NOTE:
Before servicing the unit, please read this at first.
Always contact with your service center if meet problem.
FI_SM_FSAI-SU-91-121-181-241AE2_160806

CONTENTS
1. Precaution .................................................................................................................................................... 3
1.1 Safety Precaution.......................................................................................................................... 3
1.2 Warning......................................................................................................................................... 3
2. Function........................................................................................................................................................ 6
3. Dimension .................................................................................................................................................... 7
3.1 Indoor Unit..................................................................................................................................... 7
3.2 Outdoor Unit.................................................................................................................................11
4 .Refrigerant Cycle Diagram ....................................................................................................................... 15
5 .Installation Details ..................................................................................................................................... 18
5.1 Wrench torque sheet for installation........................................................................................... 18
5.2 Connecting the cables ................................................................................................................ 18
5.3 Pipe length and the elevation ..................................................................................................... 19
5.4 Installation for the first time......................................................................................................... 20
5.5 Adding the refrigerant after running the system for many years ................................................ 21
5.6 Re-installation while the indoor unit need to be repaired ........................................................... 22
5.7 Re-installation while the outdoor unit need to be repaired......................................................... 23
6. Operation Characteristics......................................................................................................................... 25
7. Electronic function.................................................................................................................................... 26
7.1 Abbreviation ................................................................................................................................ 26
7.2 Display function........................................................................................................................... 26
7.3 Main Protection........................................................................................................................... 27
7.4 Operation Modes and Functions.................................................................................................28
8. Troubleshooting......................................................................................................................................... 34
8.1 Indoor Unit Error Display............................................................................................................. 36
8.2 Trouble shooting.......................................................................................................................... 37

3
1. Precaution
1.1 Safety Precaution
To prevent injury to the user or other
people and property damage, the following
instructions must be followed.
Incorrect operation due to ignoring
instruction will cause harm or damage.
Before service the unit, be sure to
read this service manual at first.
1.2 Warning
Installation
Do not use a defective or underrated
circuit breaker. Use this appliance on a
dedicated circuit.
There is risk of fire or electric shock.
For electrical work, contact the dealer,
seller, a qualified electrician, or an
authorized service center.
Do not disassemble or repair the product,
there is risk of fire or electric shock.
Always ground the product.
There is risk of fire or electric shock.
Install the panel and the cover of
control box securely.
There is risk of fire of electric shock.
Always install a dedicated circuit and
breaker.
Improper wiring or installation may cause fore
or electric shock.
Use the correctly rated breaker of
fuse.
There is risk of fire or electric shock.
Do not modify or extend the power
cable.
There is risk of fire or electric shock.
Do not install, remove, or reinstall the
unit by yourself (customer).
There is risk of fire, electric shock, explosion,
or injury.
Be caution when unpacking and
installing the product.
Sharp edges could cause injury, be especially
careful of the case edges and the fins on the
condenser and evaporator.
For installation, always contact the
dealer or an authorized service center.
Do not install the product on a
defective installation stand.
Be sure the installation area does not
deteriorate with age.
If the base collapses, the air conditioner could
fall with it, causing property damage, product
failure, and personal injury.
Do not let the air conditioner run for a
long time when the humidity is very high
and a door or a window is left open.
Take care to ensure that power cable
could not be pulled out or damaged during
operation.
There is risk of fire or electric shock.
Do not place anything on the power
cable.
There is risk of fire or electric shock.
Do not plug or unplug the power
supply plug during operation.
There is risk of fire or electric shock.
Do not touch (operation) the product
with wet hands.
Do not place a heater or other
appliance near the power cable.
There is risk of fire and electric shock.
Do not allow water to run into
electrical parts.
It may cause fire, failure of the product, or
electric shock.
Do not store or use flammable gas or
combustible near the product.
There is risk of fire or failure of product.
Do not use the product in a tightly
closed space for a long time.
Oxygen deficiency could occur.
When flammable gas leaks, turn off
the gas and open a window for ventilation
before turn the product on.
If strange sounds or smoke comes
from product, turn the breaker off or

4
disconnect the power supply cable.
There is risk of electric shock or fire.
Stop operation and close the window
in storm or hurricane. If possible, remove
the product from the window before the
hurricane arrives.
There is risk of property damage, failure of
product, or electric shock.
Do not open the inlet grill of the
product during operation. (Do not touch the
electrostatic filter, if the unit is so equipped.)
There is risk of physical injury, electric shock,
or product failure.
When the product is soaked, contact
an authorized service center.
There is risk of fire or electric shock.
Be caution that water could not enter
the product.
There is risk of fire, electric shock, or product
damage.
Ventilate the product from time to
time when operating it together with a stove
etc.
There is risk of fire or electric shock.
Turn the main power off when
cleaning or maintaining the product.
There is risk of electric shock.
When the product is not be used for a
long time, disconnect the power supply plug
or turn off the breaker.
There is risk of product damage or failure, or
unintended operation.
Take care to ensure that nobody
could step on or fall onto the outdoor unit.
This could result in personal injury and
product damage.
CAUTION
Always check for gas (refrigerant)
leakage after installation or repair of
product.
Low refrigerant levels may cause failure of
product.
Install the drain hose to ensure that
water is drained away properly.
A bad connection may cause water leakage.
Keep level even when installing the
product.
It can avoid vibration of water leakage.
Do not install the product where the
noise or hot air from the outdoor unit could
damage the neighborhoods.
It may cause a problem for your neighbors.
Use two or more people to lift and
transport the product.
Do not install the product where it will
be exposed to sea wind (salt spray) directly.
It may cause corrosion on the product.
Corrosion, particularly on the condenser and
evaporator fins, could cause product
malfunction or inefficient operation.
Operational
Do not expose the skin directly to
cool air for long time. (Do not sit in the
draft).
Do not use the product for special
purposes, such as preserving foods, works
of art etc. It is a consumer air conditioner,
not a precision refrigerant system.
There is risk of damage or loss of property.
Do not block the inlet or outlet of air
flow.
Use a soft cloth to clean. Do not use
harsh detergents, solvents, etc.
There is risk of fire, electric shock, or damage
to the plastic parts of the product.
Do not touch the metal parts of the
product when removing the air filter. They
are very sharp.
Do not step on or put anything on the
product. (outdoor units)
Always insert the filter securely.
Clean the filter every two weeks or more
often if necessary.
A dirty filter reduces the efficiency of the air
conditioner and could cause product
malfunction or damage.
Do not insert hands or other objects
through air inlet or outlet while the product

5
is operated.
Do not drink the water drained from
the product.
Use a firm stool or ladder when
cleaning or maintaining the product.
Be careful and avoid personal injury.
Replace the all batteries in the remote
control with new ones of the same type. Do
not mix old and new batteries or different
types of batteries.
There is risk of fire or explosion.
Do not recharge or disassemble the
batteries. Do not dispose of batteries in a
fire.
They may burn of explode.
If the liquid from the batteries gets
onto your skin or clothes, wash it well with
clean water. Do not use the remote of the
batteries have leaked.

6
2. Function
Model Names of Indoor/Outdoor Units
Capacity
Indoor units
Outdoor units
9K
12K
18K
24K
FSAI-SU-91AE2 FSOAI-SU-91AE2
FSAI-SU-121AE2 FSOAI-SU-121AE2
FSAIF-SU-181AE2 FSOAIF-SU-181AE2
FSAIF-SU-241AE2 FSOAIF-SU-241AE2

7
3. Dimension
3.1 Indoor Unit
Model W D H
715 194 285
805 194 285
957 213 302
1040 220 327
FSAI-SU-91AE2
FSAI-SU-121AE2
FSAIF-SU-181AE2
FSAIF-SU-241AE2

8

9
FSAI-SU-91AE2
FSAI-SU-121AE2
FSAIF-SU-181AE2

10
FSAIF-SU-241AE2

11
3.2 Outdoor Unit

12
487 W1
70 W2
298
555
300 D
H
12
60
93
H1
H2
D1
770 W
779 W3
322
D2
25 B1
90 B2
61.5 A2
12 A1
R6
286
D3
FSOAI-SU-91AE2, FSOAI-SU-121AE2

13
800 W
514 W1
554
60
85.5
340
12.0
311
815 W3
365
333 D
70 W2
H
H1
H2
D1
D2 D3
62 B1
106 B2
20 A1
R20
R6
61.6 A2
FSOAIF-SU-181AE2

14
FSOAIF-SU-241AE2

15
4 .Refrigerant Cycle Diagram
LIQUID SIDE
GAS SIDE
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
COMPRESSOR
2-WAY VALVE
3-WAY VALVE
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
T1 Room temp.
sensor
ACCUMULATOR
INDOOR OUTDOOR
CHECK VALVE
(Heating Model only)
CAPILIARY TUBE
FSAI-SU-91AE2 FSOAI-SU-91AE2
FSAI-SU-121AE2 FSOAI-SU-121AE2
FSAIF-SU-181AE2 FSOAIF-SU-181AE2
FSAIF-SU-241AE2 FSOAIF-SU-241AE2

16
FSAI-SU-91AE2 FSAI-SU-121AE2 FSAIF-SU-181AE2 FSAIF-SU-241AE2
FSOAI-SU-91AE2 FSOAI-SU-121AE2

17
FSOAIF-SU-181AE2 FSOAIF-SU-241AE2

18
5 .Installation Details
5.1 Wrench torque sheet for installation
Outside diameter
Torque
Additional tightening torque
mm
inch
N.cm
N.cm
Ф6.35
1/4
1500(153kgf.cm)
1600(163kgf.cm)
Ф9.52
3/8
2500(255kgf.cm)
2600(265kgf.cm)
Ф12.7
1/2
3500(357kgf.cm)
3600(367kgf.cm)
Ф15.9
5/8
4500(459kgf.cm)
4700(479kgf.cm)
Ф19
3/4
6500(663kgf.cm)
6700(683kgf.cm)
5.2 Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Nominal cross-sectional area (mm²)
3x2.5
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.
3x2.5
3x2.5
3x2.5
9 kBTU
Model
12 kBTU
18 kBTU
24 kBTU

19
5.3 Pipe length and the elevation
The pipe length and refrigerant amount:
Model
Pipe size
Standard
length
(m)
Max.
Elevation
B (m)
Max.
Length
A (m)
Additional
refrigerant
(g/m)
Gas
Liquid
3/8’’
(Ф9.52)
1/4’’
(Ф6.35)
5
10
25
15
3/8’’
(Ф9.52)
1/4’’
(Ф6.35)
5
10
25
15
1/2’’
(Ф12.7)
1/4’’
(Ф6.35)
5
20
30
15
5/8’’
(Ф15.9)
3/8’’
(Ф9.52)
5
25
50
30
Caution:
The capacity test is based on the standard length and the maximum permissive length is based on the
system reliability.
FSAI-SU-91AE2 /FSOAI-SU-91AE2
FSAI-SU-121AE2 /FSOAI-SU-121AE2
FSAIF-SU-181AE2 /FSOAIF-SU-181AE2
FSAIF-SU-241AE2 /FSOAIF-SU-241AE2

20
5.4 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
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.
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.