Mitsubishi SRK63ZM-S Technical Manual page 39

[Refer to Drain piping work.]
2. REFRIGERANT PIPING WORK
1) Restrictions on unit installation and use
• 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.
Restrictions
Main pipe length
When the outdoor unit is positioned higher,
Elevation difference between
indoor and outdoor units
When the outdoor unit is positioned lower,
CAUTION
The use restrictions appearing in the table above are applicable to the standard pipe size combinations shown in the table below.
2) Determination of pipe size
Determine refrigerant pipe size pursuant to the following guidelines based
on the indoor unit specifications.
Gas pipe Liquid pipe
ø15.88 ø6.35
Outdoor unit connected
Flare Flare
Refrigerant piping (branch pipe L) ø15.88 ø6.35
Indoor unit connected ø15.88 ø6.35
3) Refrigerant pipe wall thickness and material
• Select refrigerant pipes of the table shown on the right wall thickness and
material as specified for each pipe size.
Select pipes having a wall thickness larger than the specified
NOTE
minimum pipe thickness.
4) On-site piping work
Take care so that installed pipes may not touch components within a unit.
IMPORTANT
If touching with an internal component, it will generate abnormal sounds and/or vibrations.
Please remove the screw of a side cover and
How to remove the side cover
remove to the front.
• 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.
• The pipe should be anchored every 1.5m or less to isolate the vibration.
• Tighten a flare joint securely.
CAUTION Do not apply force beyond proper fastening torque in tightening the flare nut.
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.
Operation valve size (mm) Tightening torque (N·m)
ø6.35 (1/4") 14
ø15.88 (5/8") 68
5) Air tightness test
1 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
Marks appearing in the
Dimensional restrictions
drawing on the right
30m or less
L
20m or less H
20m or less H
When pipe is brazing.
About brazing
Brazing must be performed under a nitrogen gas flow.
Without nitrogen gas, a large quantity of foreign matters
(oxidized film) are created, causing a critical failure from
capillary tube or expansion valve clogging.
Pipe diameter [mm]
Minimum pipe wall thickness [mm]
Pipe material*
*Phosphorus deoxidized seamless copper pipe ICS 23.040.15, ICS 77.150.30
Side cover
Tightening angle (°) Recommended length of a tool handle (mm)
~ ~
18 45 60 150
~ ~
82 15 20 300
• In installing the unit, fix the unit's legs with bolts specified on the above.
• 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.
H
Outdoor unit
Plug the end of the pipe with tape, or other
material, and fill the pipe with nitrogen gas.
<N2>
Taping
Only use nitrogen gas (N )
Brazing
2
ø6.35 ø15.88
0.8 1.0
O-type pipe O-type pipe
A
Flared pipe end : A
Copper pipe
outer diameter
ø6.35
ø15.88
Copper pipe protrusion for flaring : B
Copper pipe
outer diameter
The screw of the
ø6.35
side cover is
ø15.88
tightened securely.
Do not hold the valve cap area with a spanner.
Indoor unit
L
Primary side Secondary side
Station valve
0.5MPa
Hand
Nitrogen
Relief valve
gas
(mm)
0
A
–04
9.1
19.7
(mm)
In the case of a rigid (clutch) type
With an R410A tool With a conventional tool
~ ~
0 0.5 1.0 1.5
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.
3. DRAIN PIPING WORK
• Execute drain piping by using a drain elbow and drain
grommets supplied separately as accessories, 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.)
4. ELECTRICAL WIRING WOR
Electrical installation work must be performed by an electrical i
Electrical installation work must be executed according to the t
• Do not use any supply cord lighter than one specified in pare
• braided cord (code designation 60245 IEC 51)
• ordinary tough rubber sheathed cord (code designation 602
• flat twin tinsel cord (code designation 60227 IEC 41)
Use polychloroprene sheathed flexible cord (code designation
• Ground the unit. Do not connect the grounding wire to a gas
If improperly grounded, an electric shock or malfunction may
• A grounding wire must be connected before connecting the p
• The installation of an impulse withstanding type earth leakage
such as an electric shock or a fire.
• Do not turn on the power until the electrical work is complete
• Do not use a condensive capacitor for power factor improvem
abnormal overheat accident)
• For power supply cables, use conduits.
• Do not lay electronic control cables (remote control and sign
the malfunctioning or a failure of the unit due to electric noise