Specifications

-
108
-
'10 • SR-T-091
Wires for connecting indoor and outdoor units
Exterior tape
Gas piping
Insulation
Liquid piping
Band (accessory)
Pipe cover (accessory)
Formula to calculate the volume of additional refrigerant required
7) Additional refrigerant charge
Additional charge volume (kg) = { Main length (m) – Factory charged volume 15 (m) } x 0.02 (kg/m)
*When an additional charge volume calculation result is negative,
it is not necessary to charge refrigerant additionally.
8) Heating and condensation prevention
(1) Dress refrigerant pipes (both gas and liquid pipes) for heat insulation and prevention of dew condensation.
㨯 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℃ or a higher temperature. Poor heat insulating capacity can cause heat insulation problems or cable
deterioration.
㨯 All gas pipes must be securely heat insulated in order to prevent damage from dripping water that comes from the condensation formed on them during a cooling operation
or personal injury from burns because their surface can reach quite a high temperature due to discharged gas flowing inside during a heating operation.
㨯 Wrap indoor units’ flare joints with heat insulating parts (pipe cover) for heat insulation (both gas and liquid pipes). 㨯 Give heat insulation to both gas and liquid side pipes. Bundle a heat insulating material and a pipe tightly together so that no gaps may be left between them and wrap them
together with a connecting cable by a dressing tape.
㨯 Both gas and liquid pipes need to be dressed with 20 mm or thicker heat insulation materials above the ceiling where relative humidity exceeds 70%.
●
For an installation measuring 15 m or shorter in pipe length, please charge the refrigerant volume charged for shipment at the factory, when you recharge refrigerant after servicing etc.
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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.
Gas side operation valve
Check joint
Pressurize
Close
Outdoor unit
Indoor unit
＜Work flow＞
6) Evacuation
Airtighteness test completed
Fill refrigerant
Vacuum gauge check
Vacuuming completed
Vacuuming begins
Run the vacuum pump for at least one hour after the vacuum gauge shows -101kPa or lower. (-755mmHg or lower)
Confirm that the vacuum gauge indicator does not rise even if the system is left for one hour or more.
When the system has remaining moisture inside or a leaky point, the vacuum gauge indicator will rise. Check the system for a leaky point and then draw air to create a vacuum again.
(1) Calculate a required refrigerant charge volume from the following table.
●
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.
●If an existing pipe system is used, a required refrigerant charge volume will vary depending on the liquid pipe size.
For further information, please see “5. UTILIZATION OF EXISTING PIPING.”
0.02 1.40 15
Model 40, 50, 60
Additional charge volume (kg)
per meter of refrigerant piping
(liquid pipeǾ6.35)
Refrigerant volume charged
for shipment at the factory
(kg)
Installation’s pipe length (m)
covered without additional
refrigerant charge
NOTE
Put down the refrigerant volume calculated from the pipe length onto the caution label attached on the back side of the service panel.
(2) Charging refrigerant ●
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 30 minutes.
Running the unit with an insufficient quantity of refrigerant for a long time can cause a compressor failure.
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.
(three-way valve)
Charge hose (Designed specifically for R410A)
Compound pressure gauge
Pressure gauge Gauge Manifold (Designed specifically for R410A) Handle Hi. Vacuum pump Vacuum pump adapter (Anti-reverse flow type) (Designed specifically for R410A) Charge hose (Designed specifically for R410A)
Check joint
-0.1MPa
(-76cmHg)
Handle Lo
Operation Valve
Operation Valve
(two-way valve)
Operation Valve Cap
Operation Valve Cap
tightening torque (N·m) Operation valve cap
tightening torque (N·m) Check joint blind nut
φ6.35 (1/4") φ12.7 (1/2")
20∼30
10∼12
25∼35
Operation valve size
(mm)
Securely tighten the operation valve cap and the check joint blind nut after adjustment.