Refrigerant Pipe And Drain Pipe Specifications; Refrigerant Pipe, Drain Pipe And Filling Port; Request For Refrigerant Piping Connection - Mitsubishi Electric CITY MULTI PEFY-P40VMH-E Manuel D'installation

6. Refrigerant pipe and drain pipe specifications

To avoid dew drops, provide sufficient antisweating and insulating work to the re-
frigerant and drain pipes.
When using commercially available refrigerant pipes, be sure to wind commer-
cially available insulating material (with a heat-resisting temperature of more than
100 °C and thickness given below) onto both liquid and gas pipes.
Be also sure to wind commercially available insulating material (with a form
polyethylene's specific gravity of 0.03 and thickness given below) onto all pipes
which pass through rooms.
6.1. Refrigerant pipe and drain pipe specifications
[Fig. 6.1.1] (P. 2)
A Flare cutting dimensions
C Apply refrigerating machine oil over the entire flare seat surface
A Flare cutting dimensions
Copper pipe O.D. (mm)
B Refrigerant pipe sizes & Flare nut tightening torque
Liquid pipe
Tightening
Pipe size
P40 O.D. ø6.35 (1/4") 14 – 18
P50 O.D. ø6.35 (1/4") 34 – 42
P63/71/80 O.D. ø9.52 (3/8") 34 – 42
P100/125/140 O.D. ø9.52 (3/8") 34 – 42
* Use the provided flare nut for the following pipes: Liquid pipe of P50, P100, P125, P140, and gas pipe of P50.
Liquid pipe
P200 O.D. ø9.52 (3/8")
P250 O.D. ø9.52 (3/8")
6.2. Refrigerant pipe, drain pipe and filling
port
[Fig. 6.2.1] (P. 3)
Type 40 - 140
Type 200 · 250
A Air inlet
C Refrigerant piping (gas)
E Drain outlet
6.3. Request for refrigerant piping connec-
tion
Connecting refrigerant piping
• After connecting refrigerant piping, insulate the joints (flared joints) with ther-
mal insulation tubing as shown below.
[Fig. 6.3.1] (P. 3)
Type 40 - 140
A Thermal insulation tubing 1
B 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.
C Liquid end of refrigerant piping
E Site refrigerant piping
G Marked "GAS"
I Flared insulation (supplied) 2
K Thermal insulation
M Flare nut
O Ensure that there is no gap here
Q Outside
S Remove tape
T Thermal insulation tubing (small) (supplied) 1
U Tie (large) (supplied) 4
V Ensure that there is no gap here. Place join upwards.
8
B Refrigerant pipe sizes & Flare nut tightening torque
ø6.35
ø9.52
ø12.7
ø15.88
ø19.05
R410A
Gas pipe
Tightening
Pipe size
torque torque
(N·m) (N·m)
O.D. ø12.7 (1/2") 49 – 61
O.D. ø12.7 (1/2") 68 – 82
O.D. ø15.88 (5/8") 68 – 82
O.D. ø15.88 (5/8") 100 – 120
R410A
Gas pipe
O.D. ø19.05 (3/4")
O.D. ø22.2 (7/8")
B Refrigerant piping (liquid)
D Control box
F Air outlet
D Gas end of refrigerant piping
F Main body
H Marked "OUTSIDE"
J Marked "INSIDE"
L Pull
N Return to original position
P Plate on main body
R Inside
1 Select the thickness of insulating material by pipe size.
Pipe size
6.4 mm to 25.4 mm
28.6 mm to 38.1 mm
2 If the unit is used on the highest story of a building and under conditions of
high temperature and humidity, it is necessary to use pipe size and insulating
material's thickness more than those given in the table above.
3 If there are customer's specifications, simply follow them.
Flare dimensions øA dimensions (mm)
R407C or R22
Liquid pipe
Tightening
Pipe size Pipe size
torque
(N·m)
O.D. ø6.35 (1/4") 14 – 18 O.D. ø12.7 (1/2")
O.D. ø9.52 (3/8") 34 – 42* O.D. ø15.88 (5/8")
O.D. ø9.52 (3/8") 34 – 42 O.D. ø15.88 (5/8")
O.D. ø9.52 (3/8") 34 – 42 O.D. ø19.05 (3/4")
Liquid pipe
O.D. ø12.7 (1/2")
O.D. ø12.7 (1/2")
[Fig. 6.3.2] (P. 3)
Type 200 · 250
A Thermal insulation tubing 1
B Caution:
Pull out the thermal insulation on the refrigerant piping at the site, braze the pip-
ing, and replace the insulation in its original position.
Take care to ensure that condensation does not form on exposed copper piping.
C Refrigerant piping (liquid)
E Main body
G Site refrigerant piping
H Ensure that there are no gaps between the insulation and the main body.
I Thermal insulation tubing (small) (supplied) 1
J Ties (large) (supplied) 4
K Ensure that there is no gap here. Place join upwards.
L Thermal insulation tubing (medium) (supplied) 2
M Cut
N Release gas before removing the brazing.
O Thermal insulation
Q Flared pipe end
S Return to original position
Caution:
Before removing the brazing, cut off the end of the pipe to release any gas. If
the gas is not released, the pipe may fly off.
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, braze the unit
piping, and replace the insulation in its original position.
* Before brazing the refrigerant piping, always wrap the piping on the main
body, and the thermal insulation piping, with damp cloths to prevent heat
shrinkage and burning the thermal insulation tubing. Take care to ensure
that the flame does not come into contact with the main body itself.
Insulating material's thickness
More than 10 mm
More than 15 mm
8.7 – 9.1
12.8 – 13.2
16.2 – 16.6
19.3 – 19.7
22.9 – 23.3
Flare nut O.D.
Gas pipe
Tightening Liquid
torque pipe
(N·m) (mm)
49 – 61 17
68 – 82* 22
68 – 82 22
100 – 120* 22
R407C or R22
Gas pipe
O.D. ø25.4 (1")
O.D. ø28.58 (1·1/8")
D Refrigerant piping (gas)
F Thermal insulation tubing 2
P Pull
R Wrap with damp cloth
T Ensure that there is no gap here.
Gas
pipe
(mm)
27
29
29
36