Mitsubishi Heavy Industries SRK60ZJX-S, Technical Manual

Page: 101 / 272

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100
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'10 • SR-T-091
• We recommend you to read this SAFETY PRECAUTIONS carefully before the installation work in order to gain
full advantage of the functions of the unit and to avoid malfunction due to mishandling.
• The precautions described below are divided into and . The matters with
possibilities leading to serious consequences such as death or serious personal injury due to erroneous handling
are listed in the and the matters with possibilities leading to personal injury or damage of the
unit due to erroneous handling including probability leading to serious consequences in some cases are listed
in . These are very important precautions for safety. Be sure to observe all of them without fail.
• Be sure to confirm no anomaly on the equipment by commissioning after completed installation and explain the
operating methods as well as the maintenance methods of this equipment to the user according to the owner’s
manual.
• Keep the installation manual together with owner’s manual at a place where any user can read at any time.
Moreover if necessary, ask to hand them to a new user.
• For installing qualified personnel, take precautions in respect to themselves by using suitable protective
clothing, groves, etc., and then perform the installation works.
• Please pay attention not to fall down the tools, etc. when installing the unit at the high position.
• If unusual noise can be heard during operation, consult the dealer.
• Symbols which appear frequently in the text have the following meaning:
INSTALLATION MANUAL FOR OUTDOOR UNIT
RWC012A032
Model 20·25·35·50
• This installation manual deals with outdoor units and general installation specifications only. For indoor units, refer to the respective installation manuals supplied with the units.
• When install the unit, be sure to check whether the selection of installation place, power supply specifications, usage limitation (piping length, height differences between indoor and outdoor units, power
supply voltage and etc.) and installation spaces.
SAFETY PRECAUTIONS
WARNING
Strictly prohibited
Observe instructions
with great care
Provide proper earthing
CAUTION WARNING
CAUTION
WARNING
CAUTION
• Carry out the electrical work for ground lead with care.
Do not connect the ground lead to the gas line, water line, lightning conductor or telephone line’s ground lead. Incorrect grounding can cause unit faults such as electric shocks due to short-circuiting.
• Installation must be carried out by the qualified installer.
If you install the system by yourself, it may cause serious trouble such
as water leaks, electric shocks, fire and personal injury, as a result of a
system malfunction.
• Install the system in full accordance with the instruction
manual.
Incorrect installation may cause bursts, personal injury, water leaks,
electric shocks and fire.
• Be sure to use only for household and residence.
If this appliance is installed in inferior environment such as machine
shop and etc., it can cause malfunction.
• Use the original accessories and the specified components for
installation.
If parts other than those prescribed by us are used, It may cause
water leaks, electric shocks, fire and personal injury.
• Install the unit in a location with good support.
Unsuitable installation locations can cause the unit to fall and cause
material damage and personal injury.
• Ensure the unit is stable when installed, so that it can
withstand earthquakes and strong winds.
Unsuitable installation locations can cause the unit to fall and cause
material damage and personal injury.
• Ventilate the working area well in the event of refrigerant
leakage during installation.
If the refrigerant comes into contact with naked flames, poisonous gas
is produced.
• Use the prescribed pipes, flare nuts and tools for R410A.
Using existing parts (for R22 or R407C) can cause the unit failure and
serious accidents due to burst of the refrigerant circuit.
• Tighten the flare nut by torque wrench with specified method.
If the flare nut were tightened with excess torque, this may cause
burst and refrigerant leakage after a long period.
• Do not open the operation valves for liquid line and gas line
until completed refrigerant piping work, air tightness test and
evacuation.
If the compressor is operated in state of opening operation valves
before completed connection of refrigerant piping work, air can be
sucked into refrigerant circuit, which can cause bust or personal injury
due to anomalously high pressure in the refrigerant.
• The electrical installation must be carried out by the qualified
electrician in accordance with “the norm for electrical work”
and “national wiring regulation”, and the system must be
connected to the dedicated circuit.
Power supply with insufficient capacity and incorrect function done by
improper work can cause electric shocks and fire.
• Be sure to shut off the power before starting electrical work.
Failure to shut off the power can cause electric shocks, unit failure or
incorrect function of equipment.
• Be sure to use the cables conformed to safety standard and
cable ampacity for power distribution work.
Unconformable cables can cause electric leak, anomalous heat
production or fire.
• This appliance must be connected to main power supply by
means of a circuit breaker or switch (fuse:16A) with a contact
separation of at least 3mm.
• Use the prescribed cables for electrical connection, tighten the
cables securely in terminal block and relieve the cables
correctly to prevent overloading the terminal blocks.
Loose connections or cable mountings can cause anomalous heat
production or fire.
• Arrange the wiring in the control box so that it cannot be
pushed up further into the box. Install the service panel
correctly.
Incorrect installation may result in overheating and fire.
• Be sure to fix up the service panels.
Incorrect fixing can cause electric shocks or fire due to intrusion of
dust or water.
• Be sure to switch off the power supply in the event of
installation, inspection or servicing.
If the power supply is not shut off, there is a risk of electric shocks,
unit failure or personal injury due to the unexpected start of fan.
• Stop the compressor before disconnecting refrigerant pipes in
case of pump down operation.
If disconnecting refrigerant pipes in state of opening operation valves
before compressor stopping, air can be sucked, which can cause
burst or personal injury due to anomalously high pressure in the
refrigerant circuit
• Only use prescribed optional parts. The installation must be
carried out by the qualified installer.
If you install the system by yourself, it can cause serious trouble such
as water leaks, electric shocks, fire.
• Ensure that no air enters in the refrigerant circuit when the unit
is installed and removed.
If air enters in the refrigerant circuit, the pressure in the refrigerant
circuit becomes too high, which can cause burst and personal injury.
• Do not processing, splice the power cord, or share a socket
with other power plugs.
This may cause fire or electric shock due to defecting contact,
defecting insulation and over-current etc.
• Do not bundling, winding or processing for the power cord. Or,
do not deforming the power plug due to tread it.
This may cause fire or heating.
• Do not run the unit with removed panels or protections.
Touching rotating equipments, hot surfaces or high voltage parts can
cause personal injury due to entrapment, burn or electric shocks.
• Do not perform any change of protective device itself or its
setup condition.
The forced operation by short-circuiting protective device of pressure
switch and temperature controller or the use of non specified
component can cause fire or burst.
• Use the circuit breaker with sufficient breaking capacity.
If the breaker does not have sufficient breaking capacity, it can cause
the unit malfunction and fire.
• Earth leakage breaker must be installed.
If the earth leakage breaker is not installed, it can cause electric
shocks.
• Install isolator or disconnect switch on the power supply wiring
in accordance with the local codes and regulations.
• After maintenance, all wiring, wiring ties and the like, should be
returned to their original state and wiring route, and the
necessary clearance from all metal parts should be secured.
• Secure a space for installation, inspection and maintenance
specified in the manual.
Insufficient space can result in accident such as personal injury due to
falling from the installation place.
• Take care when carrying the unit by hand.
If the unit weights more than 20kg, it must be carried by two or more
persons. Do not carry by the plastic straps, always use the carry
handle when carrying the unit by hand. Use gloves to minimize the risk
of cuts by the aluminum fins.
• Dispose of any packing materials correctly.
Any remaining packing materials can cause personal injury as it
contains nails and wood. And to avoid danger of suffocation, be sure
to keep the plastic wrapper away from children and to dispose after
tear it up.
• Be sure to insulate the refrigerant pipes so as not to condense
the ambient air moisture on them.
Insufficient insulation can cause condensation, which can lead to
moisture damage on the ceiling, floor, furniture and any other
valuables.
• When perform the air conditioner operation (cooling or drying
operation) in which ventilator is installed in the room. In this
case, using the air conditioner in parallel with the ventilator,
there is the possibility that drain water may backflow in
accordance with the room lapse into the negative pressure
status. Therefore, set up the opening port such as incorporate
the air into the room that may appropriate to ventilation (For
example; Open the door a little). In addition, just as above, so
set up the opening port if the room lapse into negative
pressure status due to register of the wind for the high rise
apartment etc.
• Do not install the unit in the locations listed below.
• Locations where carbon fiber, metal powder or any powder is floating.
• Locations where any substances that can affect the unit such as
sulphide gas, chloride gas, acid and alkaline can occur.
• Vehicles and ships.
• Locations where cosmetic or special sprays are often used.
• Locations with direct exposure of oil mist and steam such as kitchen
and machine plant.
• Locations where any machines which generate high frequency
harmonics are used.
• Locations with salty atmospheres such as coastlines.
• Locations with heavy snow (If installed, be sure to provide base
flame and snow hood mentioned in the manual).
• Locations where the unit is exposed to chimney smoke.
• Locations at high altitude (more than 1000m high).
• Locations with ammonic atmospheres.
• Locations where heat radiation from other heat source can affect the
unit.
• Locations without good air circulation.
• Locations with any obstacles which can prevent inlet and outlet air
of the unit.
• Locations where short circuit of air can occur (in case of multiple
units installation).
• Locations where strong air blows against the air outlet of outdoor
unit.
It can cause remarkable decrease in performance, corrosion and
damage of components, malfunction and fire.
• Do not install the outdoor unit in the locations listed below.
• Locations where discharged hot air or operating sound of the
outdoor unit can bother neighborhood.
• Locations where outlet air of the outdoor unit blows directly to
plants.
• Locations where vibration can be amplified and transmitted due to
insufficient strength of structure.
• Locations where vibration and operation sound generated by the
outdoor unit can affect seriously (on the wall or at the place near bed
room).
• Locations where an equipment affected by high harmonics is placed
(TV set or radio receiver is placed within 1m).
• Locations where drainage cannot run off safely.
It can affect surrounding environment and cause a claim.
• Do not install the unit near the location where leakage of
combustible gases can occur.
If leaked gases accumulate around the unit, it can cause fire.
• Do not install the unit where corrosive gas (such as sulfurous
acid gas etc.) or combustible gas (such as thinner and
petroleum gases) can accumulate or collect, or where volatile
combustible substances are handled.
Corrosive gas can cause corrosion of heat exchanger, breakage of
plastic parts and etc. And combustible gas can cause fire.
• Do not install nor use the system close to the equipment that
generates electromagnetic fields or high frequency harmonics.
Equipment such as inverters, standby generators, medical high
frequency equipments and telecommunication equipments can affect
the system, and cause malfunctions and breakdowns. The system
can also affect medical equipment and telecommunication equipment,
and obstruct its function or cause jamming.
• Do not install the outdoor unit in a location where insects and
small animals can inhabit.
Insects and small animals can enter the electric parts and cause
damage or fire. Instruct the user to keep the surroundings clean.
• Do not use the base flame for outdoor unit which is corroded
or damaged due to long periods of operation.
Using an old and damage base flame can cause the unit falling down
and cause personal injury.
• Do not use any materials other than a fuse with the correct
rating in the location where fuses are to be used.
Connecting the circuit with copper wire or other metal thread can
cause unit failure and fire.
• Do not touch any buttons with wet hands.
It can cause electric shocks.
• Do not touch any refrigerant pipes with your hands when the
system is in operation.
During operation the refrigerant pipes become extremely hot or
extremely cold depending the operating condition, and it can cause
burn injury or frost injury.
• Do not touch the suction or aluminum fin on the outdoor unit.
This may cause injury.
• Do not put anything on the outdoor unit and operating unit.
This may cause damage the objects or injury due to falling to the
object.
Accessories for outdoor unit
• Model name and power source
• Refrigerant piping length
• Piping, wiring and miscellaneous small parts
• Indoor unit installation manual
Necessary tools for the installation work
Wrench key (Hexagon) [4m/m]
Vacuum pump
Vacuum pump adapter (Anti-reverse flow type)
(Designed specifically for R410A)
Gauge manifold (Designed specifically for R410A)
Charge hose (Designed specifically for R410A)
Flaring tool set (Designed specifically for R410A)
Gas leak detector (Designed specifically for R410A)
Gauge for projection adjustment
(Used when flare is made by using conventional flare tool) 9
10
11
12
13
14
15
16
Plus headed driver
Knife
Saw
Tape measure
Hammer
Spanner wrench
Torque wrench [14.0
~
62.0N·m (1.4
~
6.2kgf·m)]
Hole core drill (65mm in diameter)
1
2
3
4
5
6
7
8
Grommet (Heat
pump type only)
Drain elbow (Heat pump type only) Model 20, 25, 35
Model 50
Q’ty
1
4
1
1
2
Option parts
Sealing plate
Sleeve
Inclination plate
Putty
Drain hose (extension hose)
Piping cover
(for insulation of connection piping)
Q’ty
1
1
1
1
1
1
Check before installation work
a
b
c
d
e
f
R410A REFRIGERANT USED
1. HAULAGE AND INSTALLATION
(Take particular care in carrying in or moving the unit, and always perform such an operation with two or more persons.)
Intake
The height of a wall is 1200mm or less.
(
service
space
)
Intake
Outlet
Fasten with bolts
(M10-12)
Use a thicker block to anchor deeper. Use a long block to extend the width.
CAUTION
When a unit is hoisted with slings for haulage, take into consideration the offset of its gravity center position.
If not properly balanced, the unit can be thrown off-balance and fall.
1) Delivery
2) Portage
3) Selecting the installation location
5) Installation space
L
3
L
2
L
4
L
1
Model 20, 25, 35, 50
Model 20, 25, 35
Example installation
Size
L1
L2
L3
L4 Open
100
100
250
280
75
80
Open
280
Open
80
250
180
Open
80
Open
(mm)
I II III IV
Heavy
6) Installation
Pad
Over 500mm
Intake
Outlet
312.5
24.3
14.8
288.8
111 510 157.8
351.6
Model 50
Intake
Outlet
312.5
24.3
14.8
288.8
88.4 510 200
351.6
• Deliver the unit as close as possible to the installation site before removing it from
the packaging.
• When you have to unpack the unit for a compelling reason before you haul it to
the installation point, hoist the unit with nylon slings or ropes and protection pads
so that you may not damage the unit.
• The right hand side of the unit as viewed from the front (diffuser side) is heavier.
A person carrying the right hand side must take heed of this fact. A person
carrying the left hand side must hold with his right hand the handle provided on
the front panel of the unit and with his left hand the corner column section.
(1) If the unit is installed in the area where the snow will accumulate, following measures are required.
The bottom plate of unit and intake, outlet may be blocked by snow.
1 Install the unit on the base so that the bottom is
higher than snow cover surface.
Since drain water generated by defrost control may freeze, following measures are required.
• Do not execute drain piping work by using a drain elbow and drain grommets (optional parts).
[Refer to Drain piping work.]
Determine refrigerant pipe size pursuant to the following guidelines based
on the indoor unit specifications.
Without nitrogen gas, a large quantity of foreign matters
(oxidized film) are created, causing a critical failure from
capillary tube or expansion valve clogging.
2 Install the unit under or provide the roof on site.
Be careful of the following conditions and choose an installation place.
• Where air is not trapped.
• Where the installation fittings can be firmly installed.
• Where wind does not hinder the intake and outlet pipes.
• Out of the heat range of other heat sources.
• A place where stringent regulation of electric noises is applicable.
• Where it is safe for the drain water to be discharged.
• Where noise and hot air will not bother neighboring residents.
• Where snow will not accumulate.
• Where strong winds will not blow against the outlet pipe.
• A place where no TV set or radio receiver is placed within 1m.
(If electrical interference is caused, seek a place less likely to cause the problem)
• If a operation is conducted when the outdoor air temperature is –5 ° C lower, the outdoor unit should be
installed at a place where it is not influenced by natural wind.
• Where it is likely that the unit is subjected to strong winds, provide wind guards according to the
following guidelines. Strong winds can cause performance degradation, an accidental stop due to a rise of
high pressure and a broken fan.
2. REFRIGERANT PIPING WORK
1) Restrictions on unit installation and use
2) Determination of pipe size
15m or less
10m or less
10m or less
L
H
H
L
H
Outdoor unit
Indoor unit
The use restrictions appearing in the table above are applicable to the standard pipe size combinations shown in the table below.
Restrictions
Model 20, 25, 35
Marks appearing in the
drawing on the right
Main pipe length
When the outdoor unit is positioned higher,
When the outdoor unit is positioned lower,
Elevation difference between
indoor and outdoor units
Plug the end of the pipe with tape, or other
material, and fill the pipe with nitrogen gas.
Only use nitrogen gas (N
2
)
Taping
<N2>
Nitrogen
Brazing
Station valve
Primary side Secondary side
0.5MPa
Hand
Relief valve
Nitrogen
gas
Brazing must be performed under a nitrogen gas flow.
About brazing
When pipe is brazing.
4) Caution about selection of installation location
• Walls surrounding the unit in the four sides are not
acceptable.
• There must be a 1-meter or larger space in the above.
• When more than one unit are installed side by side,
provide a 250mm or wider interval between them as a
service space. In order to facilitate servicing of
controllers, please provide a sufficient space between
units so that their top plates can be removed easily.
• Where a danger of short-circuiting exists, install guide
louvers.
• When more than one unit are installed, provide sufficient
intake space consciously so that short-circuiting may not
occur.
• Where piling snow can bury the outdoor unit, provide
proper snow guards.
• In installing the unit, fix the unit’s legs with bolts specified on the left.
• The protrusion of an anchor bolt on the front side must be kept within 15mm.
• Securely install the unit so that it does not fall over during earthquakes or strong winds, etc.
• Refer to the above illustrations for information regarding concrete foundations.
• Install the unit in a level area. (With a gradient of 5mm or less.) Improper installation can result in a
compressor failure, broken piping within the unit and abnormal noise generation.
1 Anchor bolt fixed position
2 Notabilia for installation
(2) If the unit can be affected by strong wind, following measures are required.
Strong wind can cause damage of fan (fan motor), or can cause performance degradation, or can trigger
anomalous stop of the unit due to rising of high pressure.
1 Place the unit outlet pipe perpendicular to the
wind direction.
2 Install so the direction of the air from the
blowing outlet will be perpendicular to the
direction of the wind.
Wind
direction
Wind
direction
• Check the following points in light of the indoor unit specifications and the installation site.
• Observe the following restrictions on unit installation and use. Improper installation can result in a compressor failure or performance degradation.
• Additional refrigerant charge is not required at all (Model 20, 25, 35).
25m or less
15m or less
15m or less
Dimensional restrictions
Model 50
ø12.7
Flare
ø12.7
ø12.7
Gas pipe
ø6.35
Flare
ø6.35
ø6.35
Model 50
Liquid pipe
ø9.52
Flare
ø9.52
ø9.52
Gas pipe
ø6.35
Flare
ø6.35
ø6.35
Model 20, 25, 35
Liquid pipe
Outdoor unit connected
Refrigerant piping (branch pipe L)
Indoor unit connected
Notabilia as a unit designed for R410A
• Do not use any refrigerant other than R410A. R410A will rise to pressure about 1.6 times higher than that of a conventional refrigerant.
A cylinder containing R410A has a pink indication mark on the top.
• A unit designed for R410A has adopted a different size indoor unit operation valve charge port and a different size check joint provided in the unit to prevent the charging of a wrong refrigerant by mistake.
The processed dimension of the flared part of a refrigerant pipe and a flare nut’s parallel side measurement have also been altered to raise strength against pressure.
Accordingly, you are required to arrange dedicated R410A tools listed in the table on the right before installing or servicing this unit.
• Do not use a charge cylinder. The use of a charge cylinder will cause the refrigerant composition to change, which results in performance degradation.
• In charging refrigerant, always take it out from a cylinder in the liquid phase.
• All indoor units must be models designed exclusively for R410A. Check connectable indoor unit models in a catalog, etc. (A wrong indoor unit, if connected into the system, will impair proper system operation)
CAUTION
Wires for connecting indoor
and outdoor units
Exterior tape
Gas piping
Insulation
Liquid piping
Band (accessory)
Pipe cover (accessory)
8) Heating and condensation prevention
Take care so that installed pipes may not touch components within a unit.
If touching with an internal component, it will generate abnormal sounds and/or vibrations.
4) On-site piping work
IMPORTANT
How to remove the side cover
Please remove the screw of a side cover and
remove to the front.
A
B
Flared pipe end : A
(mm)
ø6.35
ø9.52
ø12.7
Copper pipe
outer diameter
0
A –04
9.1
13.2
16.6
ø6.35
ø9.52
ø12.7
Copper pipe
outer diameter
0
~
0.5 1.0
~
1.5
Copper pipe protrusion for flaring : B
(mm)
In the case of a rigid (clutch) type
With an R410A tool With a conventional tool
CAUTION
Do not apply force beyond proper fastening torque in tightening the flare nut.
Tightening angle ( ° ) Tightening torque (N·m)
ø6.35 (1/4")
ø9.52 (3/8")
ø12.7 (1/2")
Recommended length of a tool handle (mm) Operation valve size (mm)
5) Air tightness test
Gas side
operation valve
Check joint
Pressuriz
e
Close
Outdoor unit
Indoor unit
<Work flow>
6) Evacuation
Pay attention to the following points in addition to the above for the R410A and compatible machines.
Air tightness test completed
Fill refrigerant
Vacuum gauge check
Vacuuming completed
Vacuuming begins
Screw
Side cover
Do not hold the valve cap area with a spanner.
3) Refrigerant pipe wall thickness and material
NOTE
*Phosphorus deoxidized seamless copper pipe ICS 23.040.15, ICS 77.150.30
ø6.35
0.8
O-type pipe
ø9.52
0.8
O-type pipe
ø12.7
0.8
O-type pipe
Pipe diameter [mm]
Minimum pipe wall thickness [mm]
Pipe material*
• Select refrigerant pipes of the table shown on the right wall thickness and
material as specified for each pipe size.
Although outdoor and indoor units themselves have been tested for air tightness at the factory, check the connecting pipes after the installation work for air tightness
from the operation valve’s check joint equipped on the outdoor unit side. While conducting a test, keep the operation valve shut all the time.
a) Raise the pressure to 0.5MPa, and then stop. Leave it for five minutes to see if the pressure drops.
b) Then raise the pressure to 1.5MPa, and stop. Leave it for five more minutes to see if the pressure drops.
c) Then raise the pressure to the specified level (4.15MPa), and record the ambient temperature and the pressure.
d) If no pressure drop is observed with an installation pressurized to the specified level and left for about one day, it is acceptable. When the ambient temperature fall
1 ° C, the pressure also fall approximately 0.01MPa. The pressure, if changed, should be compensated for.
e) If a pressure drop is observed in checking e) and a) – d), a leak exists somewhere. Find a leak by applying bubble test liquid to welded parts and flare joints and
repair it. After repair, conduct an air tightness test again.
In conducting an air tightness test, use nitrogen gas and pressurize the system with nitrogen gas from the gas side. Do not use a medium other than nitrogen gas
under any circumstances.
• Carry out the on site piping work with the operation valve fully closed.
• Give sufficient protection to a pipe end (compressed and blazed, or with an
adhesive tape) so that water or foreign matters may not enter the piping.
• Bend a pipe to a radius as large as practical (R100~R150). Do not bend a pipe
repeatedly to correct its form.
• Flare connection is used between the unit and refrigerant pipe. Flare a pipe after
engaging a flare nut onto it. Flare dimensions for R410A are different from
those for conventional R407C. Although we recommend the use of flaring tools
designed specifically for R410A, conventional flaring tools can also be used by
adjusting the measurement of protrusion B with a protrusion control gauge.
• Tighten a flare joint securely.
• To prevent a different oil from entering, assign dedicated tools, etc. to each refrigerant type. Under no circumstances must a
gauge manifold and a charge hose in particular be shared with other refrigerant types (R22, R407C, etc.).
• Use a counterflow prevention adapter to prevent vacuum pump oil from entering the refrigerant system.
Put down the refrigerant volume calculated from the pipe length onto the caution label attached
on the service panel.
• This unit contains factory charged refrigerant covering 15m of refrigerant piping and additional refrigerant
charge on the installation site is not required for an installation with up to 15m refrigerant piping.
When refrigerant piping exceeds 15m, additionally charge an amount calculated from the pipe length and
the above table for the portion in excess of 15m.
* When an additional charge volume calculation result is negative, it is not necessary to charge refrigerant
additionally.
• For an installation measuring 15m or shorter in pipe length, please charge the refrigerant volume charged
for shipment at the factory, when you recharge refrigerant after servicing etc.
Fix both liquid and gas operation valves at the valve main bodies as illustrated on the right, and then fasten them,
applying appropriate fastening torque.
Select pipes having a wall thickness larger than the specified
minimum pipe thickness.
14
~
18
34
~
42
49
~
61
45
~
60
30
~
45
30
~
45
150
200
250 Use a torque wrench. If a torque wrench is not
available, fasten the flare nut manually first and then
tighten it further, using the left table as a guide.
1
2
Run the vacuum pump for at least one hour after the vacuum
gauge shows –0.1MPa or lower. (–76cmHg or lower)
When the system has remaining moisture
inside or a leaky point, the vacuum gauge
indicator will rise.
Check the system for a leaky point and
then draw air to create a vacuum again.
Confirm that the vacuum gauge indicator does not rise even if
the system is left for one hour or more.
(three-way valve)
Charge hose (Designed specifically for R410A)
Compound pressure gauge
Pressure gauge
Gauge manifold
(Designed specifically for R410A)
Handle Hi
Vacuum pump
Vacuum pump adapter
(Anti-reverse flow type)
(Designed specifically for R410A)
Charge hose
(Designed specifically for R410A)
Check joint
-0.1MPa
(-76cmHg)
Handle Lo
Operation valve
Operation valve
(two-way valve)
Operation valve cap
Operation valve cap
Operation valve cap
tightening torque (N·m)
Check joint blind nut
tightening torque (N·m)
ø6.35 (1/4")
ø9.52 (3/8")
ø12.7 (1/2")
20
~
30
25
~
35
10
~
12
Operation valve size
(mm)
Securely tighten the operation valve cap and the check joint blind nut after adjustment.
(1) Dress refrigerant pipes (both gas and liquid pipes) for heat insulation and prevention of dew condensation.
• Improper heat insulation/anti-dew dressing can result in a water leak or dripping causing damage to household effects, etc.
(2) Use a heat insulating material that can withstand 120 ° C or a higher temperature. Poor heat insulating capacity can cause heat insulation problems or cable
deterioration.
• All gas pipes must be securely heat insulated in order to prevent damage from dripping water that comes from the condensation formed on them during a cooling
operation or personal injury from burns because their surface can reach quite a high temperature due to discharged gas flowing inside during a heating operation.
• Wrap indoor units’ flare joints with heat insulating parts (pipe cover) for heat insulation (both gas and liquid pipes).
• Give heat insulation to both gas and liquid side pipes. Bundle a heat insulating material and a pipe tightly together so that no gaps may be left between them and
wrap them together with a connecting cable by a dressing tape.
• Both gas and liquid pipes need to be dressed with 20mm or thicker heat insulation materials above the ceiling where relative humidity exceeds 70%.
(1) Calculate a required refrigerant charge volume from the following table.
• Since R410A refrigerant must be charged in the liquid phase, you should charge it, keeping the container
cylinder upside down or using a refrigerant cylinder equipped with a siphon tube.
• Charge refrigerant always from the liquid side service port with the operation valve shut. When you find it
difficult to charge a required amount, fully open the outdoor unit valves on both liquid and gas sides and
charge refrigerant from the gas (suction) side service port, while running the unit in the cooling mode. In
doing so, care must be taken so that refrigerant may be discharged from the cylinder in the liquid phase
all the time. When the cylinder valve is throttled down or a dedicated conversion tool to change liquid
phase refrigerant into mist is used to protect the compressor, however, adjust charge conditions so that
refrigerant will gasify upon entering the unit.
• In charging refrigerant, always charge a calculated volume by using a scale to measure the charge
volume.
• When refrigerant is charged with the unit being run, complete a charge operation within 30minutes.
Running the unit with an insufficient quantity of refrigerant for a long time can cause a compressor failure.
(2) Charging refrigerant
Formula to calculate the volume of additional refrigerant required
7) Additional refrigerant charge (Model 50)
Additional charge volume (kg) = { Main length (m) – Factory charged volume 15 (m) } x 0.02 (kg/m)
0.02 1.35 15 Model 50
NOTE
Additional charge volume (kg)
per meter of refrigerant piping
(liquid pipe ø6.35)
Refrigerant volume charged
for shipment at the factory
(kg)
Installation’s pipe length (m)
covered without additional
refrigerant charge
Clearance
3. DRAIN PIPING WORK
RWC012A032
• Execute drain piping by using a drain elbow and drain
grommets supplied separately as optional parts, where
water drained from the outdoor unit is a problem.
• Water may drip where there is a larger amount of drain
water. Seal around the drain elbow and drain
grommets with putty or adequate caulking material.
• Condensed water may flow out from vicinity of
operation valve or connected pipes.
• Where you are likely to have several days of sub-zero
temperatures in a row, do not use a drain elbow and
drain grommets. (There is a risk of drain water freezing
inside and blocking the drain.)
• When condensed water needs to be led to a drain, etc., install
the unit on a flat base (supplied separately as an optional part)
or concrete blocks.
Then, please secure space for the drain elbow and the drain
hose.
Drain elbow
Grommet
Drain hose
(To be procured on the installer’s part)
Do not put a grommet on
this hole.
This is a supplementary
drain hole to discharge
drain water, when a large
quantity of it is gathered.
Model 20, 25, 35
Drain elbow
Grommet
Drain hose
(To be procured on the installer’s part)
Model 50
Cable name plate
Power supply terminal block
Grounding terminal
Cable clamp
4. ELECTRICAL WIRING WORK
For details of electrical cabling, refer to the indoor unit installation manual.
CAUTION
Always use an earth leakage circuit breaker designed for inverter circuits to
prevent a faulty operation.
Outdoor unit
Switchgear or Circuit breaker
1
1
2/N
2/N
3
1 2/N 3
Indoor unit
Interconnecting and
grounding wires
(minimum)
20
25
35
50
Switch breaker
Over current protector
rated capacity
Power source
(minimum)
Model
15A, 30mA,
0.1sec or less
30A 16A 2.0mm 2 1.5mm 2 X 4
Earth leakage breaker Phase
Single-phase
INSTALLATION TEST CHECK POINTS
After installation
Check the following points again after completion of the installation, and before turning on the power. Conduct a test run again and ensure that the unit operates properly.
Explain to the customer how to use the unit and how to take care of the unit following the instruction manual.
In case of faulty wiring connection, the indoor unit stops,
and then the run lamp turns on and the timer lamp blinks.
Use cables for interconnection wiring to avoid loosening of the wires.
CENELEC code for cables Required field cables.
H
05
R
N
R
4or5
G
1.5
Harmonized cable type
300/500 volts
Natural-and/or synth. rubber wire insulation
Polychloroprene rubber conductors insulation
Stranded core
Number of conductors
One conductor of the cable is the earth conductor
(yellow/green)
Section of copper wire (mm
2
)
Power cables and connecting wires are securely fixed to the terminal block.
The power supply voltage is correct as the rating.
The drain hose is fixed securely.
Operation valve is fully open.
No gas leaks from the joints of the operation valve.
The pipe joints for indoor and outdoor pipes have been insulated.
The reverse flow check cap is attached.
The cover of the pipe cover (A) faces downward to prevent rain from entering.
Gaps are properly sealed between the pipe covers (A) (B) and the wall surface / pipes.
H05RNR4G1.5 (Example) or 245IEC57
Electrical installation work must be performed by an electrical installation service provider qualified by a power provider of the country.
Electrical installation work must be executed according to the technical standards and other regulations applicable to electrical installations in the country.
• Do not use any supply cord lighter than one specified in parentheses for each type below.
• braided cord (code designation 60245 IEC 51)
• ordinary tough rubber sheathed cord (code designation 60245 IEC 53)
• flat twin tinsel cord (code designation 60227 IEC 41)
Use polychloroprene sheathed flexible cord (code designation 60245 IEC57) for supply cords of parts of appliances for outdoor use.
• Ground the unit. Do not connect the grounding wire to a gas pipe, water pipe, lightning rod or telephone grounding wire.
If improperly grounded, an electric shock or malfunction may result.
• A grounding wire must be connected before connecting the power cable. Provide a grounding wire longer than the power cable.
• The installation of an impulse withstanding type earth leakage breaker is necessary. A failure to install an earth leakage breaker can result in an accident
such as an electric shock or a fire.
• Do not turn on the power until the electrical work is completed.
• Do not use a condensive capacitor for power factor improvement under any circumstances. (It dose not improve power factor, while it can cause an
abnormal overheat accident)
• For power supply cables, use conduits.
• Do not lay electronic control cables (remote control and signaling wires) and other cables together outside the unit. Laying them together can result in
the malfunctioning or a failure of the unit due to electric noises.
• Fasten cables so that may not touch the piping, etc.
• When cables are connected, make sure that all electrical components within the electrical component box are free of loose connector coupling or
terminal connection and then attach the cover securely. (Improper cover attachment can result in malfunctioning or a failure of the unit, if water
penetrates into the box.)
• Always use a three-core cable for an indoor-outdoor connecting cable. Never use a shield cable.
Indoor - Outdoor
connecting wire
Power cable
Power cable, indoor - outdoor connecting wire circuit diagram
Power cable, indoor-outdoor connecting wires
• It holds cables in place and protect the
terminal connection from external force.
• This clamp is for the cable in the outside
diameter 9
~
15mm.
Please adjust it when not suitable.
• Please be sure to carry out D-type (type
III) grounding work.
• It has stuck on the lid of a control box.
Indoor - Outdoor
connecting wire
Please connect the earthed
line of indoor and outdoor
connecting wire to a bracket
part of the illustration.
Model 20, 25, 35 Model 50
Model 20, 25, 35
Model 50
Power cable
L
Outdoor unit
Switchgear or Circuit breaker
N
1 2/N 3
1 2/N 3
Indoor unit
Earth leakage breaker
(Harmonic resistant type)
Earth leakage breaker
(Harmonic resistant type)
• Always perform grounding system installation work with the power cord unplugged.
• Connect a pair bearing a common terminal number with an indoor-outdoor connecting wire.
• In cabling, fasten cables securely with cable clamps so that no external force may work on terminal connections.
• Grounding terminals are provided in the control box.
• The specifications shown in the above table are for units without heaters. For units with heaters, refer to the
installation instructions or the construction instructions of the indoor unit.
• Switchgear or Circuit breaker capacity which is calculated from MAX. over current should be chosen along the
regulations in each country.
• The cable specifications are based on the assumption that a metal or plastic conduit is used with no more than
three cables contained in a conduit and a voltage drop is 2%. For an installation falling outside of these
conditions, please follow the internal cabling regulations. Adapt it to the regulation in effect in each country.
Switchgear or Circuit Breaker
CAUTION
CAUTION
CAUTION