Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual page 78

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4) On-site piping work
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Take care so that installed pipes may not touch components within a unit. If touching with an internal
IMPORTANT
component, it will generate abnormal sounds and/or vibrations.
First remove the five screws ( mark) of the service panel and push it down into the direction of the
How to remove the service panel
arrow mark and then remove it by pulling it toward you.
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The pipe can be laid in any of the following directions: side right, front, rear and downward.
● Remove a knock-out plate provided on the pipe penetration to open a minimum necessary area and attach an edging material
supplied as an accessory by cutting it to an appropriate length before laying a pipe.
● Carry out the on site piping work with the operation valve fully closed.
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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.
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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.
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The pipe should be anchored every 1.5m or less to isolate the vibration.
● Tighten a flare joint securely with a double spanner.
Do not apply force beyond proper fastening torque in tightening
CAUTION
the flare nut.
Fix both liquid and gas service valves at the valve main bodies as illustrated
on the right, and then fasten them, applying appropriate fastening torque.
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 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 0.5 MPa, and then stop. Leave it for five minutes to see if the pressure drops.
b) Then raise the pressure to 1.5 MPa, and stop. Leave it for five more minutes to see if the pressure drops.
c) Then raise the pressure to the specified level (4.15 MPa), 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℃, the pressure also fall approximately 0.01 MPa. 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.
② 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.
− − −
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｜ − ｜ ｜ − ｜ ｜ − ｜
−
｜ − ｜
− ＋
−
− − −
−
φ φ φ
φ φ
φ φ φ
φ φ
φ φ φ φ
φ
φ φ φ φ φ
φ φ φ φ φ
× × ×
φ φ
− −
φ
φ
φ φ
φ φ
− −
φ
φ
φ φ
×
φ
φ
＜ ＞
φ
A
Operation valve size Tightening torque Tightening angle
(mm) (N-m) (° )
φ6.35 (1/4")
14〜18 45〜60
φ9.52 (3/8")
34〜42 30〜45
φ12.7 (1/2")
49〜61 30〜45
φ15.88 (5/8")
15〜20
68〜82
＋ , ＋
−
− ＋
｜ − ｜
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Ｈ
Catch
Catch
For rear connection
For side right connection
For front connection
For downward connection
Flared pipe end: A (mm) Copper pipe protrusion for flaring: B (mm)
Copper Copper
0
pipe outer Ａ
pipe outer
ー0． 4
With an R410A tool
diameter diameter
φ6.35 φ6.35
9． 1
φ9.52 φ9.52
13． 2
φ12.7 φ12.7
16.6
φ15.88 φ15.88
19.7
Recommended length Do not hold the valve cap area with a spanner.
of a tool handle (mm)
150
Use a torque wrench. If a torque wrench is not available,
200
fasten the flare nut manually first and then tighten it
250
further, using the left table as a guide.
300
Outdoor unit
Model
100VN～140VN
100VNX
125VNX,140VNX
100VS～140VS
100VSX～140VSX
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The specifications shown in the above table are for units w
In the case of a rigid (clutch) type
instructions of the indoor unit.
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With a conventional tool Switchgear or Circuit breaker capacity which is calculated f
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The cable specifications are based on the assumption that
voltage drop is 2%. For an installation falling outside of the
country.
0〜0.5 0.7〜1.3
5. TEST RUN
Gas side
operation valve Indoor unit
Check joint
1) Test run method
(1) A test run can be initiated from an outdoor
(2) Switching SW3-3 to ON will start the compr
Power source Power cable thickness(mm 2 )
Single phase 3 wire
220-240V 50Hz
5.5
220V 60Hz
3 phase 4 wire
3.5
380V 50Hz
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Before conduct a test run, d
WARNING
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Turn on power 6 hours prio
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In case of the first operatio
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Always give a 3-minute or
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Removing the service panel
Take utmost care not to incu
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When you operate switches
CAUTION ●
You cannot check discharge
● The 4-way valve (20S) is en
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When power supply is cut o
off. If this procedure is no
may occur.
setting.