Installing The Indoor Unit; Installing The Pipes; Refrigerant Piping Work - Mitsubishi Electric PEAD-RP-EA Installation Manual

3. Installing the indoor unit

4. Installing the pipes

3.1. Check the indoor unit accessories (Fig. 3-1)
The indoor unit should be supplied with the following accessories.
Accessory name
1 Piping instruction
2 Insulation pipe
3 Remote controller parts
4
Insulation pipe
5 Band
6
Cord
3.2. Suspension bolt installation (Give site of suspen-
sion strong structure) (Fig. 3-2)
1 Wooden structure
• Select tie beam (one-story building) or second-floor girder (two-story buildings) as
reinforcement member.
• Use sturdy beams of at least 6cm square for beam pitch of 90cm or less or of at
least 9cm square for beam pitch of 90-180cm.
A Ceiling B Rafter
2 Ferro-concrete structures
Secure the suspension bolts using the method shown, or use steel or wooden hang-
ers, etc. to install the suspension bolts.
E Use inserts rated at 100-150 kg each (procure locally)
F Suspension bolts M10 (3/8") (procure locally)
G Steel reinforcing rod
Installing the suspension bolts
• Check the pitch of the suspension bolts.
• Use the ø10 (3/8") suspension bolts (×4, obtain locally).
• Adhere strictly to the length of the suspension bolts (specified figure below).
3.3. Carry-in/Installation of indoor unit
• Carry in indoor unit to the installation site without unpacking.
• Install indoor unit before mounting ceiling surface material.
• Lift unit body with a lifting machine, and suspend it through suspension bolt.
• Be sure to install indoor unit horizontally. Installing it in slant may cause drain water
leak.
• Check unit for horizontal installation with a level gauge, and if slanted, re-adjust it
by loosening the nut holding suspension fixtures.
4.1. Refrigerant and drainage piping locations of indoor
unit
1.For the limitation of piping length and the allowable height difference, refer to the
instruction manual of outdoor unit.
2.The connection method of piping is of flare connection. (Fig. 4-1)
A Electrical parts box
B Refrigerant piping (liquid)
RP1.6, 2, 2.5 EA 227
C Refrigerant piping (gas)
RP3, 4, 5, 6 EA
D Drain piping
RP2.5, 3, 4 GA
Q'ty
1pc.
1pc.
1pc.
1pc.
4pcs.
1pc.
C Beam D Roof beam
E F G H I
80 277 45 61
169 122 308 46 53
237 87 258 33 46

5. Refrigerant piping work

5.1. Refrigerant and drainage piping connection (Fig.
5-1)
• When commercially available copper pipes are used, wrap liquid and gas pipes
with commercially available insulation materials (heat-resistant to 100 °C or more,
thickness of 12 mm or more).
• The indoor parts of the drain pipe should be wrapped with polyethylene foam insu-
lation materials (specific gravity of 0.03, thickness of 9 mm or more).
• Apply thin layer of refrigerant oil to pipe and joint seating surface before tightening
flare nut.
• Use torque wrench and spanner to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections. Insu-
late carefully.
A Flare cutting dimensions
Copper pipe O.D.
(mm)
ø6.35
ø9.52
ø12.7
ø15.88
ø19.05
B Flare nut tightening torque
Copper pipe O.D.
(mm)
ø6.35
ø6.35
ø9.52
ø12.7
ø12.7
ø15.88
ø15.88
ø19.05
C Apply refrigerating machine oil over the entire flare seat surface.
D Use the flare nuts as follows.
Indoor unit
Refrigerant
Joint outdoor unit
Gas side Pipe size (mm)
Indoor unit
Outdoorunit
Liquid side Pipe size (mm)
Indoor unit
Outdoorunit
Indoor unit
Refrigerant
Joint outdoor unit
Gas side Pipe size (mm)
Indoor unit
J
Outdoorunit
17
Liquid side Pipe size (mm)
323
Indoor unit
179 Outdoorunit
*1: The flare nut is attached to its pipe.
*2: The flare nut is in the outdoor unit accessory.
Do not use the flare nut attached. If it is used, a gas leakage or even a pipe
extraction may occur.
Refer to the outdoor unit installation manual for the specification of connecting pipes.
5.2. Indoor unit (Fig. 5-2)
Heat insulation for refrigerant pipes:
1 Wrap the large pipe cover around the gas pipe, making sure that the end of the
pipe cover touches the side of the unit.
2 Wrap the small 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.)
A Pipe cover (large)
B Pipe cover (small)
C Band
D Cross-sectional view of connection
E Pipe
F Insulating material
G Squeeze
Flare dimensions
øA dimensions (mm)
8.7 - 9.1
12.8 - 13.2
16.2 - 16.6
19.3 - 19.7
23.6 - 24.0
Flare nut O.D. Tightening torque
(mm) (N·m)
17 14 - 18
22 34 - 42
22 34 - 42
26 49 - 61
29 68 - 82
29 68 - 82
36 100 - 120
36 100 - 120
RP1.6, 2 RP2.5, 3
R407C
PU(H)-P1.6/2 PU(H)-P2.5/3 PU(H)-P4/5/6
ø15.88 ø15.88
*1 *1
*1 *1
ø9.52 ø9.52
*1 *1
*1 *1
RP1.6, 2 RP2.5, 3
R410A
PUHZ-RP1.6/2 PUHZ-RP2.5/3 PUHZ-RP4/5/6
ø12.7 ø15.88
*2 *1
*1 *1
ø6.35 ø9.52
*2 *1
*1 *1
RP4 - 6
ø19.05
*1
*1
ø9.52
*1
*1
RP4 - 6
ø15.88
*2
*1
ø9.52
*1
*1
7