Mitsubishi Electric Mr.Slim PEA-RP100, Installation Manual

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6. Refrigerant piping work
6.4. Purging procedures leak test
PURGING PROCEDURES
Connect the refrigerant pipes (both the liquid and gas pipes) between the indoor
and the outdoor units.
Remove the service port cap of the stop valve on the side of the outdoor unit gas pipe.
(The stop valve will not work in its initial state fresh out of the factory (totally
closed with cap on).)
Connect the gage manifold valve and the vacuum pump to the service port of the
stop valve on the gas pipe side of the outdoor unit.
Run the vacuum pump. (Vacuumize for more than 15 minutes.)
Check the vacuum with the gage manifold valve, then close the gage manifold
valve, and stop the vacuum pump.
Leave it as is for one or two minutes. Make sure the pointer of the gage manifold
valve remains in the same position. Confirm that the pressure gage show -0.101MPa
(-760 mmHg).
1. Remove and discard the rubber bung which is inserted in the end of the unit piping.
2. Flare the end of the site refrigerant piping.
3. Pull out the thermal insulation on the site refrigerant piping and replace the
insulation in its original position.
Cautions On Refrigerant Piping
Be sure to use non-oxidative brazing for brazing to ensure that no foreign
matter or moisture enter into the pipe.
Be sure to apply refrigerating machine oil over the flare connection
seating surface and tighten the connection using a double spanner.
Provide a metal brace to support the refrigerant pipe so that no load is
imparted to the indoor unit end pipe. This metal brace should be provided
50 cm away from the indoor unit’s flare connection.
Pipe length :
7 m maximum
No gas charge is needed.
Pipe length exceeding 7 m
Charge the prescribed
amount of gas.
Remove the gage manifold valve quickly from the service port of the stop valve.
After refrigerant pipes are connected and evacuated, fully open all stop valves on
gas and liquid pipe sides.
Operating without fully opening lowers the performance and causes trouble.
Hexagonal wrench
*4 to 5 turns
Stop valve
(or the vacuum
pump with the
function to
prevent the back
flow)
Gauge manifold
valve (for R410A)
Pressure gauge
(for R410A)
Compound pressure
gauge (for R410A)
-0.101MPa
(-760 mmHg)
Handle
Low
Handle High
Window
Charge hose
(for R410A)
Vacuum
pump
Adapter for
preventing
the back flow
Charge hose
(for R410A)
Service port
Stop
valve
*Close
*Open
Stop valve
Tighten the cap to the service port to obtain the initial status.
Retighten the cap
Leak test
6.5. Drain piping work
[Fig. 6-5] (P.4)
Ⓐ Insulator Ⓑ Drain pipe R1
Ⓒ Drain pan Ⓓ 70 mm
Ⓔ 2 × Ⓕ 70 mm Ⓕ 35 mm
Ⓖ Downward slope 20 mm/m or more Ⓗ Drain trap
Ⓘ The drain pipe should extend below this level.
Ⓙ Open drain
• In connecting duct, insert canvas duct between unit and duct.
• Use incombustible material for duct parts.
• Provide full insulation to inlet duct flange, outlet duct flange and outlet duct to
prevent condensation.
• Be sure to apply the air filter near the air inlet grille.
• Before connecting an inlet duct, install the air filter in the inlet grille.
[Fig. 7-1-1] (P.5)
Ⓐ Air inlet Ⓑ Air outlet
Ⓒ Access door Ⓓ Ceiling surface
Ⓔ Canvas duct Ⓕ Keep duct-work length 850 or more
Ⓖ Connect common reference potential wire between duct-work to air conditioner
Caution:
• Inlet duct of 850 mm or more should be construted.
To connect the air conditioner main body and the duct for potential
equalization.
• To reduce the risk of injury from metal sheet edges, wear protective gloves.
• Install sufficient thermal insulation to prevent condensation forming on
outlet duct flanges and outlet ducts.
• To avoid electrical noise interference, do not run transmission lines at
the bottom of the unit.
• Return air temperature sensor when an inlet duct is installed.
A return air temperature sensor is installed on the inlet duct flange. Before
connecting an inlet duct, this sensor must be removed and installed in the
specified position.
7. Duct work
[Fig. 7-1-2] (P.5)
Ⓐ
Inlet duct flange
Ⓑ
Return air temperature sensor
Ⓒ
Sensor protection plate
Ⓓ
Sensor fixture
Ⓔ
Inlet duct
① Pull out the sensor, and remove the sensor fixture and protection plate. (The
protection plate must be discarded.)
② Connect the inlet duct.
③ Drill a sensor hole (ø12.5 dia.) on the side on the duct.
④ Assemble the sensor and fixture.
• When pulling out the sensor, do not pull it by the lead wire. Doing so may result
in wire breakage.
• Before connecting the inlet duct, make sure that the sensor, its fixture and
protection plate are removed.
• The sensor removed in step ① must be re-installed in the position specified
in the drawing. Installation of the sensor in an incorrect position may result in
malfunction.
Mount holes for outlet duct flange and inlet duct.
[Fig. 7-1-3] (P.5)
Ⓐ Inlet duct flange
Ⓑ Outlet duct flange
Ⓒ
Top of the unit