Changing To Bottom Intake Specifications; Refrigerant Pipe And Drain Pipe Specifications; Refrigerant Pipe, Drain Pipe And Filling Port - Mitsubishi Electric CITY MULTI PDFY-P-NMU-E Installation Manual

5.3. Changing to bottom intake specifications

Changing the bottom panel installation position. (Fig. 5.3.1)
1. Remove the flange (C screws)
2. Remove the bottom panel (6 screws)
3. Fit the bottom panel to the rear of the main body. (6 screws)
4. Fit the flange B to the underside of the main body. (C screws)
[Fig. 5.3.1] (P.3)
Bottom panel

6. Refrigerant pipe and drain pipe specifications

To avoid dew drops, provide sufficient antisweating and insulating work to the
refrigerant 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[212 °F] and thickness given below) onto both liquid and gas pipes.
Be also sure to wind commercially available insulating material (with a form poly-
ethylene'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.3)
Flare cutting dimensions
Refrigerant pipe sizes & Flare nut tightening torque
Apply refrigerating machine oil over the entire flare seat surface
Flare cutting dimensions
Copper pipe O.D. (mm) [in]
φ 15.88 [5/8]
φ 19.05 [3/4]
Refrigerant pipe sizes & Flare nut tightening torque
Liquid pipe
Tightening
Pipe size
torque
(mm) [in]
O.D. φ 6.35 [1/4]
P06/08/12/15 14 – 18
O.D. φ 6.35 [1/4]
P18 34 – 42
O.D. φ 9.52 [3/8]
P24/27/30 34 – 42
O.D. φ 9.52 [3/8]
P36/48 34 – 42
* Use the provided flare nut for the following pipes: Liquid pipe of P18, P36, P48 and gas pipe of P18.
6.2. Refrigerant pipe, drain pipe and filling
port
[Fig. 6.2.1] (P.3)
A
Model name
06~30 126
36·48 121
A
Model name
06~30 4-31/32
36·48 4-25/32
Refrigerant piping (liquid pipe)
Drain piping (when the optional drain-up mechanism is used)
Drain hole (usual drain outlet)
Feed-water inlet for checking drain water
Control box
8
Flange
φ 6.35 [1/4]
φ 9.52 [3/8]
φ 12.7 [1/2]
R410A
Gas pipe
Tightening
Pipe size
torque
(mm) [in]
(N·m) (N·m)
O.D. φ 12.7 [1/2]
49 – 61
O.D. φ 12.7 [1/2]
68 – 82
O.D. φ 15.88 [5/8]
68 – 82
O.D. φ 15.88 [5/8]
100 – 120
B C
172 265 111
206 305 151
B C
6-25/32 10-7/16 4-3/8
8-1/8 12-1/32 5-31/32
Refrigerant piping (gas pipe)
A Select the thickness of insulating material by pipe size.
Pipe size
6.4 mm to 25.4 mm [1/4 in to 1in]
28.6 mm to 38.1 mm [1-1/8 in to 1-1/2 in]
B 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.
C If there are customer's specifications, simply follow them.
Flare dimensions φ A dimensions (mm) [in]
R22
Liquid pipe
Tightening
Pipe size
torque
(mm) [in]
(N·m)
O.D. φ 6.35 [1/4]
14 – 18
O.D. φ 9.52 [3/8]
34 – 42*
O.D. φ 9.52 [3/8]
34 – 42
O.D. φ 9.52 [3/8]
34 – 42
(mm)
D
(in)
D
Insulating material's thickness
More than 10 mm [13/32 in]
More than 15 mm [19/32 in]
8.7-9.1 [11/32~6/16]
12.8-13.2 [17/32~17/32]
16.2-16.6 [21/32~21/32]
19.3-19.7 [25/32~25/32]
22.9-23.3 [29/32~30/32]
Gas pipe
Tightening Liquid
Pipe size
torque pipe
(mm) [in]
(N·m) (mm) [in]
O.D. φ 12.7 [1/2]
49 – 61 17 [11/16]
O.D. φ 15.88 [5/8]
68 – 82* 22 [7/8]
O.D. φ 15.88 [5/8]
68 – 82 22 [7/8]
O.D. φ 19.05 [3/4]
100 – 120* 22 [7/8]
Flare nut O.D.
Gas
pipe
(mm) [in]
27 [1-3/32]
29 [1-5/32]
29 [1-5/32]
36 [1-7/16]