Mitsubishi Electric CITY MULTI PLFY-P20VBM-E Manuel D'installation page 5

3. Refrigerant pipe and drain pipe
Refrigerant pipe sizes & Flare nut tightening torque
Liquid pipe
Pipe size
(mm)
P20/25/32/40 ODø6.35 (1/4")
P50 ODø9.52 (3/8")
P63/80 ODø9.52 (3/8")
P100/125 ODø9.52 (3/8")
* Connect the joint with the following pipes: Liquid and gas pipes of P50, gas pipe of P100/P125.
Fig. 3-3
Max. 20m
1.5–2m
Fig. 3-4
11
25 25 25
Fig. 3-5
R407C or R22
Gas pipe
Tightening Tightening
Pipe size
torque torque
(mm)
(N.m) (N.m)
14 - 18 ODø12.7 (1/2") 49 - 61
14 - 18* ODø15.88 (5/8") 49 - 61*
34 - 42 ODø15.88 (5/8") 68 - 82
34 - 42 ODø19.05 (3/4") 68 - 82*
Refrigerant pipe and
insulating material
Pipe cover (large)
Pipe cover (small)
Refrigerant pipe (gas)
Refrigerant pipe (liquid)
Band
Cross-sectional view of
connection
Pipe
Insulating material
Squeeze
Max. 15cm
(mm)
,
R410A
Liquid pipe
Tightening
Pipe size Pipe size
torque
(mm) (mm)
(N.m)
ODø6.35 (1/4") 14 - 18 ODø12.7 (1/2")
ODø6.35 (1/4") 14 - 18 ODø12.7 (1/2")
ODø9.52 (3/8") 34 - 42 ODø15.88 (5/8")
ODø9.52 (3/8") 34 - 42 ODø15.88 (5/8")
Apply refrigerating machine oil over the entire flare seat surface.
* Do not apply refrigerating machine oil to the screw portions.
(This will make the flare nuts more apt to loosen.)
Be certain to use the flare nuts that are attached to the main unit.
(Use of commercially-available products may result in cracking.)
3.3. Indoor unit (Fig. 3-3)
Heat insulation for refrigerant pipes:
1 Wrap the enclosed large-sized pipe cover around the gas pipe, making sure
that the end of the pipe cover touches the side of the unit.
2 Wrap the enclosed small-sized pipe cover around the liquid pipe, making sure
that the end of the pipe cover touches the side of the unit.
3 Secure both ends of each pipe cover with the enclosed bands. (Attach the
bands 20 mm from the ends of the pipe cover.)
• After connecting the refrigerant piping to the indoor unit, be sure to test the pipe
connections for gas leakage with nitrogen gas. (Check that there is no refrigerant
leakage from the refrigerant piping to the indoor unit.)
3.4. Drainage piping work (Fig. 3-4)
• Use VP25 (O.D. ø32 (1-1/4") PVC TUBE) for drain piping and provide 1/100 or
more downward slope.
• Be sure to connect the piping joints using a polyvinyl type adhesive.
• Observe the figure for piping work.
• Use the included drain hose to change the extraction direction.
Correct piping
Wrong piping
Insulation (9 mm or more)
Downward slope (1/100 or more)
Support metal
Air bleeder
Raised
Odor trap
Grouped piping
O. D. ø32 PVC TUBE
Make it as large as possible
Indoor unit
Make the piping size large for grouped piping.
Downward slope (1/100 or more)
O. D. ø38 PVC TUBE for grouped piping.
(9 mm or more insulation)
Up to 85 cm
1. Connect the drain socket (supplied with the unit) to the drain port. (Fig. 3-5)
(Fix the tube using PVC adhesive then secure it with a band.)
2. Install a locally purchased drain pipe (PVC pipe, O.D. ø32).
(Fix the pipe using PVC adhesive then secure it with a band.)
3. Insulate the tube and pipe. (PVC pipe, O.D. ø32 and socket)
4. Check that drain flows smoothly.
5. Insulate the drain port with insulating material, then secure the material with a
band. (Both insulating material and band are supplied with the unit.)
Unit
Insulating material
Band (large)
Drain port (transparent)
Insertion margin
Matching
Drain pipe (O.D. ø32 PVC TUBE)
Insulating material (purchased locally)
Transparent PVC pipe
O.D. ø32 PVC TUBE (Slope 1/100 or more)
Band (small)
Drain socket
Flare nut O.D.
Gas pipe
Tightening
Liquid pipe
torque
(mm)
(N.m)
49 - 61 17
49 - 61 17
68 - 82 22
68 - 82 22
Gas pipe
(mm)
26
26
29
29
5