Mitsubishi SRK63ZM-S Technical Manual page 40

• 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 18
~
ø15.88 (5/8") 68 82
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 0.5MPa, 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.
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.
6) Evacuation
<Work flow>
Air tightness test completed
Vacuuming begins
When the system has remaining moisture
inside or a leaky point, the vacuum gauge
indicator will rise.
Vacuuming completed
Check the system for a leaky point and
then draw air to create a vacuum again.
Vacuum gauge check
Pay attention to the following points in addition to the above for the R410A and compatible machines.
• 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.
7) Additional refrigerant charge
(1) Calculate a required refrigerant charge volume from the following table.
Additional charge volume (kg) Refrigerant volume charged
per meter of refrigerant piping for shipment at the factory
(liquid pipe ø6.35) (kg)
0.025 1.80
• 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.
Formula to calculate the volume of additional refrigerant required
Additional charge volume (kg) = { Main length (m) – Factory charged volume 15 (m) } x 0.025 (kg/m)
* 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.
8) Heating and condensation prevention
(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
Tightening angle (°) Recommended length of a tool handle (mm)
~
45 60 150
~
15 20 300
Run the vacuum pump for at least one hour after the vacuum
gauge shows –0.1MPa or lower. (–76cmHg or lower)
Confirm that the vacuum gauge indicator does not rise even if
the system is left for one hour or more.
Fill refrigerant
(2) Charging refrigerant
Installation's pipe length (m)
covered without additional
refrigerant charge
15
Copper pipe protrusion for flaring : B
Copper pipe
outer diameter
The screw of the
ø6.35
side cover is
ø15.88
tightened securely.
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.
Do not hold the valve cap area with a spanner.
Outdoor unit
Operation valve cap
Operation valve
(two-way valve) -0.1MPa
(-76cmHg)
Handle Lo
Operation valve
(three-way valve)
Operation valve cap
Check joint Charge hose (Designed specifically for R410A)
Securely tighten the operation valve cap and the check joint blind nut after adjustment.
Operation valve size Operation valve cap
(mm) tightening torque (N·m)
~
ø6.35 (1/4") 20 30
~
ø15.88 (5/8") 30 40
• 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.
Put down the refrigerant volume calculated from the pipe length onto the caution label attached
NOTE
on the service panel.
Band (accessory)
(mm)
In the case of a rigid (clutch) type
With an R410A tool With a conventional tool
~ ~
0 0.5 1.0 1.5
Gas side
operation valve
Indoor unit
Check joint
Compound pressure gauge
Pressure gauge
Gauge manifold
(Designed specifically for R410A)
Handle Hi
Charge hose
(Designed specifically for R410A)
Vacuum pump adapter
(Anti-reverse flow type)
(Designed specifically for R410A)
Vacuum pump
Check joint blind nut
tightening torque (N·m)
~
10 12
Pipe cover (accessory)
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 nois
• Fasten cables so that may not touch the piping, etc.
• When cables are connected, make sure that all electrical com
terminal connection and then attach the cover securely. (Imp
penetrates into the box.)
• Never use a shield cable.
• SRC-ZMA-S and SRC-YMA-S complies with the DRED (Dema
modes 1, 2, and 3 (DRM1, 2, and 3). Since the air conditione
cooling operation or heating operation may deteriorate over t
input and supports ELV (Extra-Low Voltage) complying with
SRC-ZM-S models
Power supply terminal block
Cable clamp
• It holds cables in place and
connection from external fo
• This clamp is for the cable
~
9 15mm. Please adjust it
• In case of SRC-ZM-S mode
power cable and the indoor
• In case of SRC-ZMA-S and
clamp holds the indoor-out
the DRED cable.
Cable clamp
• Only SRC-ZMA-S and SRC
• This clamp holds the powe
Cable name plate
• It has stuck on the lid of a c
Grounding terminal
• Please be sure to carry out
grounding work.
• Earth wire s
Yellow/Gree
color and lo
other AC wir
safety reaso
Power cable Indoor - Outdoor
connecting wire
INSTALLATION TEST CHECK
Check the following points again after completion of the installa
Explain to the customer how to use the unit and how to take ca