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Dry Vacuuming
• If vacuum pump possible vacuuming until less than -100.7kpa.
10.1.3.
Selecting The Outdoor Unit Installation Locations
• Select location which satisfies the following condition, and then confirm with the customer that such a place is satisfactory before
installing the outdoor unit.
1. There should be sufficient ventilation.
2. The outdoor unit should be sheltered as much as
2. The outdoor unit should be sheltered as much as
possible from rain and direct sunlight, and the air
should be able to move around so that hot and cold
air do not build up.
should be able to move around so that hot and cold
air do not build up.
3. There should not be animals or plants near the air
outlet which could be adversely affected by hot or cold
air coming out from the unit.
air coming out from the unit.
4. The outlet air and operating noise should not be a
nuisance to other occupants nearby.
5. The location should be able to withstand the full
weight and vibration of the outdoor unit, and it should
also be level and safe for the unit to be installed.
also be level and safe for the unit to be installed.
6. The intake and outlet should not be covered.
7. There should not be danger of flammable gas or
7. There should not be danger of flammable gas or
corrosive gas leaks.
8. There should be as little back-ventilation (air blowing directly onto the fan) as possible.
(If strong wind blows directly onto the fan, it may cause problems with normal operation.)
• If you know which direction the prevailing wind comes from during the operating season, set the outdoor unit at a right-
angle to this wind direction, or so that the air outlet faces toward a wall or fence.
• If there are obstructions near the outdoor unit and the wind direction is not constant, install an optional air guider.
9. Do not allow any obstacles near the outdoor unit which will interfere with air flow around the air intake and air outlet.
10. If installing in a location which is prone to snowfall, place the installation base as high as possible, and be sure to install a
roof or enclosure which does not allow snow to accumulate.
11. Avoid installing the unit in places where petroleum products (such as machine oil), salinity, sulphurous, gases or high-
frequency noise are present.
CAUTION
Do not use a “CHARGE CYLINDER”.
As a rule, please collect all existing refrigerants in the system outside the system when the
refrigerant leakage occurs by the system.
After that, please fill new refrigerant of a regulated amount again.
refrigerant leakage occurs by the system.
After that, please fill new refrigerant of a regulated amount again.
Running vacuum pump at both liquid and gas side for more than 1 hour and vacuuming until -100.7kpa.
After that keep the pressure -100.7kpa for 1 hour and confirm the vacuum gauge value not increasing.
If vacuum gauge value is increase, there is possibility of water inside the unit or there is any leakage.
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12. Be sure to leave enough space around the outdoor unit to maintain proper performance and to allow access for routine
maintenance.
• Allow enough space from any obstacles as shown in Fig.1.2 below in order to prevent short-circuits from occurring.
(If installing more than one outdoor unit, make the necessary space available as outlined in 14.)
However, there should be at least 1 meter of free space above the unit.
However, there should be at least 1 meter of free space above the unit.
• The height of any obstacles at the air intake and outlet sides should not be greater than the height of the outdoor unit.
13. If installing more than one outdoor unit, allow enough space around each unit as shown below.
• The distance given above are the minimum distance required in order to maintain proper performance.
Allow as much space as possible in order to get the best performance from the units.
10.1.4.
Transporting And Installing The Outdoor Unit
• Transporting
1. The outdoor unit should be transported in its original packaging as close to the installation location as possible.
2. If suspending the outdoor unit, use a rope or belt, and use cloth or wood as padding in order to avoid damaging the unit.
2. If suspending the outdoor unit, use a rope or belt, and use cloth or wood as padding in order to avoid damaging the unit.
• Installation
1. Read the “Selecting the outdoor unit installation location” section thoroughly before installing the outdoor unit.
2. If installing the unit to a concrete base or other solid base, use M10 or W3/8 bolts and nuts to secure the unit, and ensure
2. If installing the unit to a concrete base or other solid base, use M10 or W3/8 bolts and nuts to secure the unit, and ensure
that the unit is fully upright and level.
(The anchor bolt positions are shown in the diagram at the right side.)
In particular, install the unit at a distance from the
neighbouring building which conforms to regulations
specified by local noise emission regulation
standards.
(The anchor bolt positions are shown in the diagram at the right side.)
In particular, install the unit at a distance from the
neighbouring building which conforms to regulations
specified by local noise emission regulation
standards.
3. Do not install the outdoor unit to the building’s roof.
4. If there is a possibility that vibration may be
4. If there is a possibility that vibration may be
transmitted to the rooms of the building, place rubber
insulation between the unit and the installation
surface.
insulation between the unit and the installation
surface.
5. Drain water will be discharged from the outdoor unit
when operating the system in heating or defrosting
modes. Select an installation location which will allow
the water to drain away properly, or provide a
drainage channel so that the water can drain away.
(If this is not done, the drain water may freeze during
winter, or the water may spill down to areas
underneath the installation location.)
modes. Select an installation location which will allow
the water to drain away properly, or provide a
drainage channel so that the water can drain away.
(If this is not done, the drain water may freeze during
winter, or the water may spill down to areas
underneath the installation location.)
Maintain sufficient space above the unit.
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• If a drain pipe needs to be installed, insert the accessory drain elbow into the mounting hole at the bottom of the outdoor unit, and
connect a hose with an inside diameter of 15mm to this drain elbow.
(The hose is not supplied.)
(The hose is not supplied.)
In cold regions (where the outdoor air temperature can drop to 0°C or below continuously for 2-3 days), the drain water may freeze,
and this may prevent the fan from operating. Do not use the drain elbow in such cases.
and this may prevent the fan from operating. Do not use the drain elbow in such cases.
10.1.5.
Notes On Reuse Of Existing Refrigerant Piping
• In the circumstances listed below, do not reuse any refrigerant piping. Instead, make sure to install a new piping.
(Reuse is not allowed.)
- Heat insulation is not provided for either liquid-side or gas-side piping or both.
- The existing refrigerant pipe has been left in an open condition.
- The size of the existing refrigerant piping does not meet the applicable size requirement. (Applicable piping size is as
- The existing refrigerant pipe has been left in an open condition.
- The size of the existing refrigerant piping does not meet the applicable size requirement. (Applicable piping size is as
indicated in the table below.)
- The length of the existing refrigerant piping is not within the range of allowable piping length. (Allowable length range is as
indicated in the table below.)
- Branch pipe is used for twin type or branch piping is run on indoor side.
• In the circumstances listed below, do not reuse the refrigerant piping as it is but wash it thoroughly before reusing it.
- Pump down operation cannot be performed for the existing air conditioner.
- The compressor has a failure history.
- Oil is discolored.
- The existing air conditioner is gas/oil heat pump type.
- Refrigerant oil used for the existing air conditioner is other than “ester oil, ethereal oil, ATMOS, SUNISO or H.A.B”.
- The compressor has a failure history.
- Oil is discolored.
- The existing air conditioner is gas/oil heat pump type.
- Refrigerant oil used for the existing air conditioner is other than “ester oil, ethereal oil, ATMOS, SUNISO or H.A.B”.
• Do not reuse the flare to prevent gas leak. Make sure to install a new flare.
• If there is a welded part on the existing refrigerant piping, conduct a gas leak check on the welded part.
• Replace deteriorated heat insulating material with a new one. Heat insulating material is required for both liquid-side and gas-
• If there is a welded part on the existing refrigerant piping, conduct a gas leak check on the welded part.
• Replace deteriorated heat insulating material with a new one. Heat insulating material is required for both liquid-side and gas-
side piping.
10.1.6.
Refrigerant Piping Size And Allowable Piping Length
1. Refrigerant piping size
• In case of new installation, make sure to use standard piping size.
• In case of reuse of existing piping, the size must be within the range of refrigerant piping size combination as specified in the
• In case of reuse of existing piping, the size must be within the range of refrigerant piping size combination as specified in the
above table.
If using the drain elbow, install the outdoor unit on a base which is at least 5cm high.
NOTE
Observe the followings when reusing the existing refrigerant piping.
Inadequate refrigerant piping could result in failure.
Inadequate refrigerant piping could result in failure.
Outdoor unit capacity
Liquid-side applicable piping size (mm)
1 size down
Standard
1 size up
YL24, YL28 type
ø6.35 x t0.8
ø9.52 x t0.8
ø12.7 x t0.8
Outdoor unit capacity
Gas-side applicable piping size (mm)
Standard
1 size up
YL24, YL28 type
ø15.88 x t0.8
—
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2. Allowable piping length
3. Additional limitations for twin-type
• Maximum allowable one-way piping length is the larger
numerical value between (Lo + La) and (Lo + Lb).
• For twin type, only the main piping can be reused among
the existing piping. Brandnew standard pipe should be
installed for branch pipe/branch piping.
installed for branch pipe/branch piping.
10.1.7.
Connecting The Pipes
• Use a clean pipe which does not include water or dust for inside of piping.
• When cutting the refrigerant pipes, a piping cutter must be used. Before connecting the refrigerant pipes, blow nitrogen and blow
• When cutting the refrigerant pipes, a piping cutter must be used. Before connecting the refrigerant pipes, blow nitrogen and blow
off dust in the pipes.
(Never use tools which cause a lot of dust such as a saw and a magnet.)
(Never use tools which cause a lot of dust such as a saw and a magnet.)
• When waxing replace nitrogen inside the piping after removing dirt and dust. (In order to prevent oxidization scale from forming
inside the piping).
• The refrigerant pipes are of particular importance.
The installation work for refrigerant cycles in separate-type air conditioners must be carried out perfectly.
• Set the lower limit of the allowable pipe length to 7.5m.
If the pipe is shorter than 7.5m, the refrigerant may become overfilled and a problem such as abnormal high pressure could
occur.
occur.
1. Refer to the table below for the pipe diameters equivalent lengths and indoor/outdoor unit difference of elevation.
Pipe diameter
Gas side
Standard
Liquid side
1 size down
Standard
1 size up
Allowable piping length (min. ~ max.)
7.5m ~ 10m
7.5m ~ 30m
7.5m ~ 15m
Height difference
between indoor and
outdoor unit
Outdoor unit is
located on upper side
5m or less
25m or less
15m or less
Outdoor unit is
located on lower side
5m or less
20m or less
10m or less
Pipe diameter
Gas side
Standard
Liquid side
1 size down
Standard
1 size up
Allowable piping length
Lo + La + Lb
7.5m ~ 10m
7.5m ~ 30m
7.5m ~ 15m
Max. allowable
one-way piping length
Lo + La
Lo + Lb
Lo + Lb
10m or less
20m or less
10m or less
Branch pipe length
La , Lb
5m or less
10m or less
10m or less
Difference in branch
pipe lengt
La - Lb
3m or less
5m or less
5m or less
Height
difference
H2
Height
difference
between indoor
and outdoor
unit
Outdoor unit is
located on upper side
5m or less
25m or less
15m or less
Outdoor unit is
located on lower side
5m or less
20m or less
10m or less
H1
Height difference between indoor units
0.5m or less
0.5m or less
0.5m or less
Outdoor unit on upper side
Outdoor unit on lower side
Pipe diameter (mm)
Equivalent
length (m)
Difference of
elevation (m)
Difference of
elevation (m)
Liquid-side pipes
Gas-side pipes
ø9.52 x t1.0
ø15.88 x t1.2
30
25
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