Refrigerant Piping Work - Mitsubishi Electric FDT125VNVF Technical Manual

● When the outdoor unit is installed on a roof or a high place, provide permanent ladders and handrails along the access route and fences and handrails around the outdoor unit.
If safety facilities are not provided, it can cause personal injury due to falling from the installation place.
● 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.
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)
1. HAULAGE AND INSTALLATION
When a unit is hoisted with slings for haulage, take into consideration the offset of its gravity center position.
CAUTION
If not properly balanced, the unit can be thrown off-balance and fall.
1) Delivery
●
Deliver the unit as close as possible to the installation site before removing it from the packaging.
●
When some compelling reason necessitates the unpacking of the unit before it is carried in, use nylon
slings or protective wood pieces so as not to damage the unit by ropes lifting it.
3) Selection of installation location for the outdoor unit
Be sure to select a suitable installation place in consideration of following conditions.
〇 A place where it is horizontal, stable and can endure the unit weight and will not allow vibration transmittance of the unit.
〇 A place where it can be free from possibility of bothering neighbors due to noise or exhaust air from the unit
〇 A place where the unit is not exposed to oil splashes.
〇 A place where it can be free from danger of flammable gas leakage.
〇 A place where drain water can be disposed without any trouble.
〇 A place where the unit will not be affected by heat radiation from other heat source.
〇 A place where snow will not accumulate.
〇 A place where the unit can be kept away 5m or more from TV set and/or radio receiver in order to avoid any radio or TV interference.
〇 A place where good air circulation can be secured, and enough service space can be secured for maintenance and service of the unit safely.
〇 A place where the unit will not be affected by electromagnetic waves and/or high-harmonic waves generated by other equipment.
〇 A place where chemical substances like sulfuric gas, chloric gas, acid and alkali (including ammonia), which can harm the
unit, will not be generated and not remain.
〇 A place where strong wind will not blow against the outlet air blow of the unit
4) Caution about selection of installation location
OD25.4
(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.
● Don't execute drain piping work by using a drain elbow and drain grommets (optional parts). [Refer to Drain piping work.]
● Recommend setting Defrost Control (SW3-1) and Snow Guard Fan Control (SW3-2). [Refer to Setting SW3-1, SW3-2.]
(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.Install the outlet air blow side of the
unit to face a wall of building, or
provide a fence or a windbreak
screen.
Over 500 mm

2. REFRIGERANT PIPING WORK

1) Restrictions on unit installation and use
(Take particular care in carrying in or moving the unit, and always perform such an operation with two or more persons.)
2. Provide a snow hood to 3. Install the unit under eaves
the outdoor unit on site. or provide the roof on site.
Regarding outline of a snow
hood, refer to our technical
manual.
2.Install the outlet air blow side of 3.The unit should be installed on
the stable and level foundation.
the unit in a position
perpendicular to the direction of If the foundation is not level,
tie down the unit with wires.
wind.
Wind direction
Wind direction
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 clean up the unit with water
It can cause electric shocks
● Do not operate the outdoor unit with any article placed on it.
You may incur property damage or personal injure from a fall of the article.
● Do not step onto the outdoor unit.
You may incur injury from a drop or fall.
Pad
2) Portage
●
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.
Wooden pallet
5) Installation space
●
Walls surrounding the unit in the four sides are not acceptable.
●
There must be a 1-meter or larger space in the above.
●
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.
●
A barrier wall placed in front of the exhaust diffuser must not be higher than the unit.
Example installation
Size
L1
L2
L3
L4
6) Installation
①
Anchor bolt fixed position
Intake
Outlet
190 580 200
● 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 15 mm.
● Securely install the unit so that it does not fall over during earthquakes or strong winds, etc.
●
Refer to the left illustrations for information regarding concrete foundations.
● Install the unit in a level area. (With a gradient of 5 mm or less.)
Improper installation can result in a compressor failure, broken piping within the unit and abnormal noise generation.
7) To run the unit for a cooling operation, when the outdoor temperature
is –5°C or lower.
● When the outdoor air temperature is -5°C or lower, provide a snow hood to the outdoor unit on site.
So that strong wind will not blow against the outdoor heat exchanger directly. Regarding outline of a snow hood,
refer to our technical manual.
Dedicated R410A tools
a） Gauge manifold
b） Charge hose
c） Electronic scale for refrigerant charging
d） Torque wrench
e） Flare tool
f） Protrusion control copper pipe gauge
g ）
Vacuum pump adapter
h） Gas leak detector
（mm）
200V, 250V L
Intake 3
L
2
Ⅰ Ⅱ Ⅲ
L
4
Open Open 500
Intake
300 5 Open
service
( )
150 300 150 Outlet
space
L
1
5 5 5
② Notabilia for installation
Fasten with bolts
(M10-12)
Use a thicker block to anchor deeper.
Use a long block to extend the width.
In the case of a triple ty
In the case of a W-twin
CAUTIO
3) How to u
● φ22.22(OD) siz
be used by usi
Accessory p
φ 22.22 (ID)
Heavy
4) Refrigera
●
Select refriger
size.
●
This unit uses
because O-typ