Fujitsu ASU9RLQ Service Instructions Manual page 79

SPLIT TYPE ROOM AIR CONDITIONER
INSTALLATION MANUAL
(P/N 9315140050-01) ENGLISH
(MODEL: ASU18RL/AOU18RL; ASU18CL/AOU18CL)
• Connect all wiring tightly. Loose wiring may cause overheating at con-
IMPORTANT!
nection points and a possible fire hazard.
Please Read Before Starting
When Transporting
This air conditioning system meets strict safety and operating standards. Be careful when picking up and moving the indoor and outdoor units.
As the installer or service person, it is an important part of your job to Get a partner to help, and bend your knees when lifting to reduce strain
install or service the system so it operates safely and efficiently.
on your back. Sharp edges or thin aluminum fins on the air conditioner
can cut your fingers.
For safe installation and trouble-free operation, you must:
When Installing...
• Carefully read this instruction booklet before beginning.
• Follow each installation or repair step exactly as shown.
...In a Ceiling or Wall
• Observe all local, state, and national electrical codes.
Make sure the ceiling/wall is strong enough to hold the unit's weight. It
• Pay close attention to all danger, warning, and caution notices given in
may be necessary to construct a strong wood or metal frame to provide
this manual.
added support.
This symbol refers to a hazard or unsafe practice which
WARNING: ...In a Room
can result in severe personal injury or death.
Properly insulate any tubing run inside a room to prevent "sweating"
that can cause dripping and water damage to walls and floors.
This symbol refers to a hazard or unsafe practice which
CAUTION: can result in personal injury and the potential for product
or property damage. ...In Moist or Uneven Locations
Use a raised concrete pad or concrete blocks to provide a solid, level
• Hazel alerting symbols
foundation for the outdoor unit. This prevents water damage and abnor-
mal vibration.
Electrical
...In an Area with High Winds
Securely anchor the outdoor unit down with bolts and a metal frame.
Provide a suitable air baffle.
Safety / alert ...In a Snowy Area (for Heat Pump-type Systems)
Install the outdoor unit on a raised platform that is higher than drifting
snow. Provide snow vents.
If Necessary, Get Help
When Connecting Refrigerant Tubing
These instructions are all you need for most installation sites and mainte-
nance conditions. If you require help for a special problem, contact our • Keep all tubing runs as short as possible.
sales/service outlet or your certified dealer for additional instructions. • Use the flare method for connecting tubing.
• Apply refrigerant lubricant to the matching surfaces of the flare and
In Case of Improper Installation
union tubes before connecting them, then tighten the nut with a torque
The manufacturer shall in no way be responsible for improper installation wrench for a leak-free connection.
• Check carefully for leaks before starting the test run.
or maintenance service, including failure to follow the instructions in this
document.
NOTE:
SPECIAL PRECAUTIONS Depending on the system type, liquid and gas lines may be either nar-
row or wide. Therefore, to avoid confusion the refrigerant tubing for your
particular model is specified as either "small" or "large" rather than as
When Wiring
"liquid" or "gas".
ELECTRICAL SHOCK CAN CAUSE SEVERE PERSONAL
When Servicing
INJURY OR DEATH. ONLY A QUALIFIED, EXPERIENCED
ELECTRICIAN SHOULD ATTEMPT TO WIRE THIS SYSTEM. • Turn the power OFF at the main circuit breaker panel before opening
• Do not supply power to the unit until all wiring and tubing are completed
the unit to check or repair electrical parts and wiring.
• Keep your fingers and clothing away from any moving parts.
or reconnected and checked.
• Highly dangerous electrical voltages are used in this system. Carefully • Clean up the site after you finish, remembering to check that no metal
scraps or bits of wiring have been left inside the unit being serviced.
refer to the wiring diagram and these instructions when wiring. Improper
• After installation, explain correct operation to the customer, using the
connections and inadequate grounding can cause accidental injury
or death. operating manual.
• Ground the unit following local electrical codes.
STANDARD ACCESSORIES
GENERAL
This INSTALLATION MANUAL briefly outlines where
The following installation accessories are supplied. Use them as
and how to install the air conditioning system. Please required.
read over the entire set of instructions for the indoor INDOOR UNIT ACCESSORIES
and outdoor units and make sure all accessory parts
Name and Shape Q'ty Name and Shape
listed are with the system before beginning.
Wall hook bracket Cloth tape
1. TYPE OF COPPER PIPE AND INSULATION MATERIAL
Copper tubing for connectin the outdoor unit to the indoor
1
unit and insulation material is available for purchase locally.
When you purchase them, please specify the following.
Tapping screw (big)
A. Deoxidized annealed copper pipe for refrigerant piping as:
Remote
control unit
Table 3
Small pipe Large pipe 1
Outer diameter Thickness Outer diameter Thickness
Tapping screw (small)
1/4"(6.35 mm) 1/32"(0.8 mm) 1/2"(12.7 mm) 1/32"(0.8 mm)
Cut each pipe to the appropriate length +12" (30 cm)
Battery (penlight)
to16" (40 cm) to dampen vibration between units.
B. Foamed polyethylene insulation for copper pipes as
2 Air cleaning filter
required to precise length of piping. Wall thickness
of the insulation should not be less than 5/16" (8 mm).
C. Use insulated copper wire for field wiring.
Remote control
unit holder
CAUTION Air cleaning filter frame
Check local electrical codes and regulations
1
before obtaining wire. Also, check any specified
instructions or limitations.
2. ADDITIONAL MATERIALS REQUIRED FOR INSTALLATION
Drain pipe Seal A
A. Refrigeration (armored) tape
B. Insulated staples or clamps for connecting wire
1
(See your local electrical codes.)
C. Putty
D. Refrigeration lubricant
E. Clamps or saddles to secure refrigerant piping
The following items are necessary to install this air conditioner. (The
3. OPERATING RANGE
items are not included with the air conditioner and must be purchased
separately.)
Table 4
Name
Cooling/Dry Mode Heating Mode
Connection pipe assembly
Outdoor temperature About 14 to 115 °F About 5 to 75 °F
Connection cord (3-conductor)
Indoor temperature About 64 to 90 °F 88 °F or less
Wall pipe
Indoor humidity About 80% or less
Decorative tape
ADDITIONAL CHARGE Vinyl tape
Refrigerant suitable for a piping length of 49 ft (15 m) is charged in Wall cap
the outdoor unit at the factory.
Saddle
When the piping is longer than 49 ft (15 m), additional charging is necessary.
Drain hose
For the additional amount, see the table below.
Tapping screws
Table 5
Sealant
Pipe length 49 ft (15 m) 66 ft (20 m)
Additional
None 3.5 oz (100 g)
refrigerant
Between 49 ft (15 m) and 66 ft (20 m), when using a connection pipe ELECTRICAL REQUIREMENT
other than that in the table, charge additional refrigerant with 0.2 oz/
ft (20g/1 m) as the criteria.
Always make the air conditioner power supply a special branch cir-
cuit and provide a special switch and receptacle. Do not extend the
CAUTION
power cord.
(1) When adding refrigerant, add the refrigerant from
the charging port at the completion of work. CAUTION
(2) The maximum length of the piping is 66 ft (20 m).
MINIMUM CIRCUIT AMPACITY
If the units are further apart than this, correct
operation can not be guaranteed. MAXIMUM OVERCURRENT PROTECTION
(TIME DELAY FUSE OR HACR TYPE CIRCUIT BREAKER)
This air conditioner uses new refrigerant HFC (R410A).
The basic installation work procedures are the same as conventional refrigerant (R22) models.
However, pay careful attention to the following points:
(1) Since the working pressure is 1.6 times higher than that of conventional refrigerant(R22) mod-
els, some of the piping and installation and service tools are special.(See the table below.)
Especially, when replacing a conventional refrigerant(R22) model with a new refrigerant R410A
model, always replace the conventional piping and flare nuts with the R410A piping and flare nuts.
(2) Models that use refrigerant R410A have a different charging port thread diameter to prevent
erroneous charging with conventional refrigerant(R22) and for safety. Therefore, check
beforehand.[The charging port thread diameter for R410A is 1/2 threads per inch.]
(3) Be more careful that foreign matter (oil, water, etc.) does not enter the piping than with
refrigerant(R22) models. Also, when storing the piping ,securely seal the opening by pinching,
taping, etc.
(4) When charging the refrigerant, take into account the slight change in the composition of the gas
and liquid phases, and always charge from the liquid phase side whose composition is stable.
Special tools for R410A
Tool name Contents of change
Pressure is high and cannot be measured with a conventional gauge. To prevent erroneous
mixing of other refrigerants, the diameter of each port has been changed.
Gauge manifold
It is recommended the gauge with seals-0.1 to 5.3 MPa (-1 to 53 bar) for high pressure.
-0.1 to 3.8 MPa (-1 to 38 bar) for low pressure.
Charge hose To increase pressure resistance, the hose material and base size were changed.
Vacuum pump A conventional vacuum pump can be used by installing a vacuum pump adapter.
Gas leakage detector Special gas leakage detector for HFC refrigerant R410A.
Copper pipes
It is necessary to use seamless copper pipes and it is desirable Table 1 Thicknesses of Annealed Copper Pipes
that the amount of residual oil is less than 40 mg/10m. Do not
use copper pipes having a collapsed, deformed or discolored
Nominal
portion (especially on the interior surface). Otherwise, the ex-
diameter
pansion value or capillary tube may become blocked with con-
1/4
taminants.
1/2
As an air conditioner using R410A incurs pressure higher than
when using R22, it is necessary to choose adequate materials.
Thicknesses of copper pipes used with R410A are as shown in Table1.Never use copper pipes thinner than 0.8mm even
when it is available on the market.
WARNING
(1) Do not use the existing (for R22) piping and flare nuts.
• If the existing materials are used, the pressure inside the refrigerant cycle will rise and cause breakage, injury,
etc.(Use the special R410A materials.)
(2) When installing and relocating the air conditioner, do not mix gases other than the specified refrigerant(R410A)
to enter the refrigerant cycle.
• If air or other gas enters the refrigerant cycle, the pressure inside the cycle will rise to an abnormally high value
and cause breakage, injury, etc.
CAUTION
When installing pipes shorter than 3m, sound of the outdoor unit will be transferred to the indoor unit, which will
cause large operating sound or some abnormal sound.
SELECTING THE MOUNTING INSTALLATION DIAGRAM OF
POSITION INDOOR AND OUTDOOR UNITS
Decide the mounting position with the customer as follows:
Fig. 7
1. INDOOR UNIT
[INDOOR UNIT]
Q'ty
(1) Install the indoor unit level on a strong wall which is not subject
to vibration.
(2) The inlet and outlet ports should not be obstructed : the air should
1
be able to blow all over the room.
2-2/5"(6 cm) or over
(3) Install the unit near an electric outlet or special branch circuit.
(4) Do not install the unit where it will be exposed to direct sunlight.
(5) Install the unit where connection to the outdoor unit is easy.
(6) Install the unit where the drain pipe can be easily installed.
8 (7) Take servicing, etc. into consideration and leave the spaces shown
in (Fig. 7). Also install the unit where the filter can be removed.
2. OUTDOOR UNIT
60"(150 cm) or over
(1) If possible, do not install the unit where it will be exposed to di-
rect sunlight. (If necessary, install a blind that does not interfere 95" (240 cm)
2 with the air flow.)
or over
(2) Do not install the unit where a strong wind blows or where it is
very dusty.
(3) Do not install the unit where people pass.
(4) Take your neighbors into consideration so that they are not dis-
2 turbed by air blowing into their windows or by noise.
Remote
(5) Provide the space shown in Fig. 7 so that the air flow is not blocked.
control unit
Also for efficient operation, leave open three of the four direc-
tions front, rear, and both sides.
Connection Cord
WARNING
2
14AWG
Install at a place that can withstand the weight of the
indoor and outdoor units and install positively so that
[OUTDOOR UNIT]
the units will not topple or fall.
CAUTION
1
(1) Do not install where there is the danger of com- 4"(10 cm)
or over
bustible gas leakage.
(2) Do not install near heat sources.
(3) If children under 10 years old may approach the
unit, take preventive measures so that they can-
not reach the unit.
12"(30 cm)
or over
Q'ty
1
[Indoor unit piping direction] Mounting Support
1
(Prepared On-site)
1 The piping can be connected in the five directions indicated by 1, 2, 3,
4, and 5 in (Fig. 6). When the piping is connected in direction 2 or 5, cut
1
along the piping groove in the side of the front cover with a hacksaw.
1
When connecting the piping in direction 3, cut a notch in the thin wall at
[Reverse cycle only]
1 the front bottom of the front cover.
Fig. 6
1 set
1
5 Left
1 set
outlet
1
2 Right outlet 1 Rear outlet
4 Left rear
3 Bottom outlet
outlet
Fig. 8
21-1/4" (54 cm) NOTE:
In places where the outdoor temperature drops
to 32°F or lower, the drain water may freeze and
may stop up the drain or cause other outdoor
unit trouble. Therefore take measures so that
16 A
the drain water will not freeze and clog the
drain.
20 A
INDOOR UNIT
5 cm or over
1.
CUTTING THE HOLE IN THE WALL FOR THE CONNECTING PIPING
(1) Cut a 3-2/16''(80 mm) diameter hole in the wall at the position shown
in (Fig.1).
(2) When cutting the wall hole at the inside of the wall hook bracket,
cut the hole within the range of the left and right center marks
3/8''(10 mm) below the installation frame.
When cutting the wall hole at the outside of the wall hook bracket,
cut the hole at least 3/8''(10 mm) below less.
(3) Cut the hole so that the outside end is lower 3/16'' to 3/8'' (5 to 10 mm)
than the inside end.
(4) Always align the center of the wall hole. If misaligned, water leak-
age will occur.
(5) Cut the wall pipe to match the wall thickness, stick it into the wall
cap, fasten the cap with vinyl tape, and stick the pipe through the
hole. (The connection pipe is supplied in the installation set.)
(Fig.1)
(6) For left piping and right piping, cut the hole a little lower so that
drain water will flow freely. (Fig.1)
2.
INSTALLING THE WALL HOOK BRACKET
(1) Install the wall hook bracket so that it is correctly positioned hori-
zontally and vertically. If the wall hook bracket is titled, water will
drip to the floor.
(2) Install the wall hook bracket so that it is strong enough to with-
stand the weight of an adult.
G Fasten the wall hook bracket to the wall with 6 or more screws
through the holes near the outer edge of the bracket.
G
Check that there is no rattle at the wall hook bracket.
WARNING
If the wall pipe is not used, the cord interconnecting
the indoor and outdoor units may touch metal and
cause electric leakage.
3.
FORMING THE DRAIN HOSE AND PIPE
[Rear piping, Right piping, Bottom piping]
G
Install the indoor unit piping in the direction of the wall hole and
bind the drain hose and pipe together with vinyl tape. (Fig. 3)
G
Install the piping so that the drain hose is at the bottom.
G Wrap the pipes of the indoor unit that are visible from the outside
Thickness (mm)
with decorative tape.
Outer diameter
[For Left rear piping, Left piping]
R410A [ref.] R22
(mm)
Interchange the drain cap and the drain hose.
6.35 0.80 0.80
CAUTION
12.7 0.80 0.80
(1) In order to align the drain hose and drain cap, be
sure to insert securely and vertically. Incline in-
sertion will cause water leakage.
(2) When inserting, be sure not to attach any mate-
rial besides water. If any other material is attached,
it will cause deterioration and water leakage.
(3) After removing drain hose, be sure not to forget
mounting drain cap.
(4) Be sure to fix the drain hose with tape to the bot-
tom of piping.
(5) Prevent drain water frozen under low tempera-
ture environment.
When installing indoor unit's drain hose outdoors,
necessary measure for frost protection should be
taken to prevent drain water frozen.
G Under low temperature environment (when out-
door temperature under 32 °F), after cooling op-
eration is executed, water in the drain hose could
be frozen.
Once drain water is frozen, the drain hose will
be blocked and water leakage may be resulted
for indoor unit.
OUTDOOR UNIT
OUTDOOR UNIT INSTALLATION
G
Set the unit on a strong stand, such as one made of concrete blocks
to minimize shock and vibration.
G Do not set the unit directly on the ground because it will cause trouble.
Wall hook bracket Connector cover removal
2"(5 cm)
or over G Remove the two mounting screws.
Installing the connector cover
(1) After inserting the three front hooks, then insert the rear hook.
3- 3/5"(9 cm)
(2) Tighten the two mounting screws.
or over
WARNING
(1) Install the unit where it will not be tilted by more
than 5°.
(2) When installing the outdoor unit where it may ex-
(Wall cap)
posed to strong wind, fasten it securely.
Remote
control
unit holder
AIR PURGE
Tapping
Always use a vacuum pump to purge the air.
screw
(small) Refrigerant for purging the air is not charged in the
outdoor unit at the factory.
Close the high pressure side valve of the gauge manifold fully and do
not operate it during the following work.
1. Check if the piping connections are secure.
4"(10 cm)
or over
24"(60 cm)
2. Check that the stems of 2-way valve and 3-way valve are closed
or over
fully.
3. Connect the gauge manifold charge hose to the charging port
of the 3-way valve (side with the projection for pushing in the
valve core).
12"(30 cm)
or over
4. Open the low pressure side valve of the gauge manifold fully.
5. Operate the vacuum pump and start pump down.
6. Slowly loosen the flare nut of the 3-way valve and check if air
enters, then retighten the flare nut.
2"(5 cm)
or over (When the flare nut is loosened the operating sound of the
vacuum pump changes and the reading of the compound
pressure gauge goes from minus to zero.)
7. Pump down the system for at least 15 minutes, then check if the
compound pressure gauge reads -0.1 MPa (-76 cmHg, -1 bar).
8. At the end of pump down, close the low pressure side gauge of
the gauge manifold fully and stop the vacuum pump.
Outdoor unit bottom
9. Slowly loosen the valve stem of the 3-way valve. When the
compound pressure gauge reading reaches 0.1-0.2 MPa,
Drain hose
retighten the valve stem and disconnect the charge hose
from the 3-way valve charging port.
(If the stem of the 3-way valve is opened fully before the
charge hose is disconnected, it may be difficult to disconnect
the charge hose.)
10. Fully open the valve stems of the 2-way valve and 3-way valve
using a hexagon wrench. (After the valve stem begins to turn,
turn it with a torque of less than 2.17ft •lbs (30 kgf•cm) until it
stops turning.)
G
For left piping and left rear piping, align the marks on the wall
hook bracket and shape the connection pipe.
G Bend the connection piping at a bend radius of 2 - 3/4''(70 mm) or
Center mark
more and install no more than 1- 3/8''(35 mm) from the wall.
Fig. 1 3-2/16''(80 mm)
G After passing the indoor piping and drain hose through the wall
dia. hole
hole, hang the indoor unit on the hooks at the top and bottom of
the wall hook bracket.
Lower
Lower
[Installing the indoor unit]
G
Hang the indoor unit from the hooks at the top of the wall hook
3/8''(10 mm) 3/8''(10 mm)
bracket.
or over or over
G Insert the spacer, etc. between the indoor unit and the wall hook
3-2/16''(80 mm) dia. hole
bracket and separate the bottom of the indoor unit from the wall.
Fasten with (A 2-9/16''(65mm)
3/16'' to 3/8''
diameter hole is
vinyl tape (5 to 10 mm)
low possible for the right-
hand side.) Indoor unit
(Wall pipe)
(Wall cap)
(Inside) (Outside)
Wall
Center notch
Wall hook bracket
Wall hook bracket
Fig. 2
Hook
4.
CONNECTING THE PIPING
Tapping screw
Wall hook String CONNECTION
bracket
Counter weight (1) Install the outdoor unit wall cap (supplied with the optional in-
stallation set or procured at the site) to the wall pipe.
CAUTION
(2) Connect the outdoor unit and indoor unit piping.
(3) After matching the center of the flare surface and tightening the
Install the wall hook bracket horizontally and perpen-
nut hand tight, tighten the nut to the specified tightening torque
dicularly.
with a torque wrench. (Tighten the flare nut of the outdoor unit
3-way valve after air purging.)
FLARING
Fig. 3 (1) Cut the connection pipe to the necessary length with a pipe cutter.
(2) Hold the pipe downward so that cuttings will not enter the pipe
and remove the burrs.
(3) Insert the flare nut onto the pipe and flare the pipe with a flaring
Bind with vinyl tape tool.
Right piping
Pipe (top)
Check if [L] is flared uniformly
Rear piping
and is not cracked or scratched.
Bottom Indoor unit drain hose
piping (bottom)
L dimension
Thin pipe 1/4" (6.35 mm)dia. ...... 1/16" (1.4 to 1.7 mm)
For left outlet piping, cut off the
Thick pipe 1/2" (12.7 mm)dia. ...... 5/64" (1.9 to 2.2 mm)
piping outlet cutting groove
with a hacksaw.
Remove the drain cap by pulling
Indoor unit at the projection at the end of BENDING PIPES
drain hose Drain cap
the cap with pliers, etc.
The pipes are shaped by your hands. Be careful not to collapse them.
Removal method of drain Installation method of
hose drain hose
G G
Remove the screw at the left of Vertically insert the drain hose
toward the inside, so that the
drain hose and pull out drain
drain fixture (blue) can accu-
hose.
rately align with the screw hole
around the drain cock.
Extend the pipe
After inserting and before re-
OK
Screw Drain hose
placing, please reinstall and fix by unwinding it.
the removed screws.
Do not bend the pipes in an angle more than 90°.
Drain fixture (blue)
Screw
When pipes are repeatedly bent or stretched, the material will harden,
Screw hole making it difficult to bend or stretch them any more. Do not bend or stretch
the pipes more than three times.
Drain fixture
Drain hose
(blue)
Drain cock
G Be sure to install around the drain hose connector.
G As the screw is inside, be sure to use screwdriver treated with magnet.
ELECTRICAL WIRING (OUTDOOR UNIT)
Fig. 9 1. Remove the screws, then remove the control box cover.
2. Fasten the Inter unit wire harness and power supply to the conduit holder using the lock nut.
3. Connect inter-unit wire harness and power supply to the terminal.
Refer to the wiring diagram
4. Use the screws to install the control box cover.
WARNING
Tapping screw
Be sure to comply with local codes while run-
Front hooks
ning the wire from the indoor unit to the out-
Rear hooks
door unit (size of wire and wiring method, etc. ).
Connector cover Every wire must be connected firmly.
No wire should be allowed to touch refrigerant
tubing, the compressor or any moving part.
Loose wiring may cause the terminal to over-
heat or result in unit malfunction. A fire hazard
may also exist. Therefore, be sure all wiring is
tightly connected.
Connect wires to the matching numbers of
terminals.
11. Firmly tighten the 2-way valve and 3-way valve blank cap and
Fig. 11
the charging port cap.
Indoor unit
Fig. 10
Terminal
Grounding line
G G
Gauge manifold
Compound pressure gauge
Pressure gauge
-0.1 MPa
2-way valve Control line
3-way valve
(-76 cmHg
LO
HI
Flare nut -1 bar)
High 3 3
Low pressure pressure
2 2
side valve side valve
1 1
(closed)
DISCONNECT
Valve stem (Inter Unit)
SWITCH
Charge
Power line
(FIELD SUPPLY)
hose
Blank cap
Charge hose
Charging port
Charging port cap
Vacuum pump
Table 6 Indoor unit
terminal block
Tightening torque
Blank cap (2-way valve) 14.47 to 18.08 ft•lbs (200 to 250 kgf•cm)
1 2 3 4
Blank cap (3-way valve) 20.25 to 23.15 ft•lbs (280 to 320 kgf•cm)
Charging port cap 9.04 to 11.57 ft•lbs (125 to 160 kgf•cm)
Earth screw
CAUTION
G
(1) Refrigerant must not be discharged into atmos-
phere.
(2) After connecting the piping , check the joints for
gas leakage with gas leak detector.
Fig. 4
Connection pipe
(1/4" (6.35 mm) dia.)
Align the marks.
Bend 2-3/4''(R70)
with a pipe bender
Connection pipe
(1/2''(12.7 mm) dia.)
Top hooks
Wall hook
(Spacer)
bracket
Indoor unit
(Fitting) Bottom hooks
After hooking the indoor unit to the top hook, hook the fittings of the
indoor unit to the two bottom hooks while lowering the unit and
pushing it against the wall.
Fig. 5
Tighten with two wrenches.
Wrench (fixed)
Flare nut
Torque wrench
To prevent gas leakage,
Connection pipe
Indoor unit pipe coat the flare surface
with refrigerator oil.
Table 2 Flare nut tightening torque
Flare nut Tightening torque
11.57 to 13.02 ft•lbs
1/4" (6.35 mm)dia.
(160 to 180 kgf•cm)
36.17 to 39.78 ft•lbs
1/2" (12.7 mm)dia.
(500 to 550 kgf•cm)
CAUTION
(1) Fasten a flare nut with a torque wrench as instructed in this manual. If
fastened too tight, the flare nut may be broken after a long period of time
and cause a leakage of refrigerant.
(2) During installation, make sure that the refrigerant pipe is attached firmly
before you run the compressor. Do not operate the compressor under the
condition of refrigerant piping not attached properly with 2-way or 3-way
valve open. This may cause abnormal pressure in the refrigeration cycle
that leads to breakage and even injury.
NO
NOTE:
• Connector trade size for this unit is 1/2" (12.7 mm). The connec-
tor can be bought at a hardware store. Refer to "How to connect
wiring to the terminals" for instructions on connecting depend-
ing on the wire type you are using.
• The fuse located in the outdoor unit provides power supply pro-
tection and may blow when power is applied if the system has
been incorrectly wired.
Lock nut
Cord Clamp
Outdoor unit
Terminal
G G
Conduit
208/230V 208/230V
connector
208/230V 208/230V
Power supply
208/230V 208/230V Inter-unit
wire harness
Outdoor unit
terminal block
1 2 3 4 5
Disconnect switch Earth screw
G
Power supply line