Purging Procedures Leak Test; Drain Piping Work - Mitsubishi Electric Mr. SLIM SEZ-M25DA Manuel D'installation

6. Refrigerant piping work
Refrigerant pipe insulation
• After connecting refrigerant piping, insulate the joints (flared joints) with thermal
insulation tubing.
[Fig. 6-3-2] (P.4)
Ⓐ Pipe cover (small) (accessory)
Ⓑ Caution:
Pull out the thermal insulation on the refrigerant piping at the site, insert the flare nut to
flare the end, and replace the insulation in its original position.
Take care to ensure that condensation does not form on exposed copper piping.
Ⓒ Liquid end of refrigerant piping
Ⓔ Site refrigerant piping
Ⓖ Pipe cover (large) (accessory)
Ⓘ Pull
Ⓚ Return to original position
Ⓜ Plate on main body
Ⓞ Ensure that there is no gap here. Place join upwards.
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.
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 gauge 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 gauge manifold valve, then close the gauge manifold
valve, and stop the vacuum pump.
Leave it as is for one or two minutes. Make sure the pointer of the gauge
manifold valve remains in the same position. Confirm that the pressure gauge
show -0.101MPa (-760 mmHg).
Stop valve
*Close
Stop valve
*Open
Hexagonal wrench
Service port
*4 to 5 turns
14
Ⓓ Gas end of refrigerant piping
Ⓕ Main body
Ⓗ Thermal insulation (field supply)
Ⓙ Flare nut
Ⓛ Ensure that there is no gap here
Ⓝ Band (accessory)
Compound pressure
-0.101MPa
gauge (for R32/R410A)
(-760 mmHg)
Pressure gauge
(for R32/R410A)
Gauge manifold valve
(for R32/R410A)
Handle High
Handle
Low Charge hose
Stop (for R32/R410A)
valve
(or the vacuum
Vacuum
pump
pump with the
Window
function to
Adapter for
prevent the back
Charge hose
preventing
flow)
(for R32/R410A)
the back flow
Remove the gauge 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.
Pipe length :
7 m maximum
No gas charge is needed.
Tighten the cap to the service port to obtain the initial status.
Retighten the cap
6.5. Drain piping work
• Ensure that the drain piping is downward (pitch of more than 1/100) to the
outdoor (discharge) side. Do not provide any trap or irregularity on the way. ( ① )
• Ensure that any cross-wise drain piping is less than 20 m (excluding the
difference of elevation). If the drain piping is long, provide metal braces to prevent
it from waving. Never provide any air vent pipe. Otherwise drain may be ejected.
• Use a hard vinyl chloride pipe O.D. ø32 for drain piping.
• Ensure that collected pipes are 10 cm lower than the unit body's drain port as
shown in ② .
• Do not provide any odor trap at the drain discharge port.
• Put the end of the drain piping in a position where no odor is generated.
• Do not put the end of the drain piping in any drain where ionic gases are
generated.
• After connecting the drain piping, make sure that water is discharged properly
and that there are no leaks.
[Fig. 6-5-1] (P.4)
Ⓐ Downward slope 1/100 or more
Ⓑ Connection dia. R1 external thread
Ⓒ Indoor unit
Ⓓ Collective piping
Ⓔ Maximize this length to approx. 10 cm
1. Insert the drain hose (accessory) into the drain port.
(The drain hose must not be bent more than 45° to prevent the hose from
breaking or clogging.)
The connecting part between the indoor unit and the drain hose may be
disconnected at the maintenance. Fix the part with the accessory band, not be
adhered.
2. Attach the drain pipe (O.D. ø32 PVC TUBE, field supply).
(Attach the pipe with glue for the hard vinyl chloride pipe, and fix it with the band
(small, accessory).)
3. Perform insulation work on the drain pipe (O.D. ø32 PVC TUBE) and on the
socket (including elbow).
[Fig. 6-5-2] (P.4)
Ⓐ Indoor unit
Ⓑ Pipe cover (short) (accessory)
Ⓒ Tie band (accessory)
Ⓓ Band fixing part
Ⓔ Insertion margin
Ⓕ Drain hose (accessory)
Ⓖ Drain pipe (O.D. ø32 PVC TUBE, field supply)
Ⓗ Insulating material (field supply)
Ⓘ Max.145 ± 5 mm
Pipe length exceeding 7 m
Charge the prescribed
amount of gas.
Leak test