Positioning Refrigerant And Drain Piping; Indoor Unit; Drainage Piping Work - Mitsubishi Electric CITY MULTI PKFY-P VGM-E Manuel D'installation

4. Refrigerant pipe
1
E
35
B
C
700
D
Fig. 4-2
2
A
D
8
E
60
Fig. 4-3
A
Fig. 4-4
1
2
Fig. 4-5

5. Drainage piping work

A
C
Fig. 5-1
C
B
581 54
449 86
D
A F
153
B
C
E
D
10
D
22
70 35
8
E
190
60
B
D
C
E
G
F
E
D
C
B

4.2. Positioning refrigerant and drain piping

1 Position of refrigerant and drain piping (Fig. 4-2)
• The drain pipe can be cut midway to meet the on-site conditions.
A (Total length of flexible hose)
B Liquid pipe
C Gas pipe
2 Determine the position of the knockout holes on the unit body. (Fig. 4-3)
s Cut the knockout holes using a saw blade or an adequate knife.
Take care not to damage other parts of the unit.
• Remove the corner box and drill a knockout hole. If a hole is made without remov-
ing the box, the drain hose could be damaged.
A Left-side piping
B Lower piping
C Right-side piping
4.3. Refrigerant piping (Fig. 4-4)

Indoor unit

1. Remove the flare nut and cap of the indoor unit.
2. Make a flare for the liquid pipe and gas pipe and apply refrigerating machine oil
(available from your local supplier) to the flare sheet surface.
3. Quickly connect the on site cooling pipes to the unit.
4. Wrap the pipe cover 3 that is attached to the gas pipe and make sure that the
connection join is not visible.
5. Wrap the pipe cover of the unit's liquid pipe and make sure that it covers the
insulation material of the on site liquid pipe.
6. Use the bands that are provided 4 to tighten both ends (15 – 20mm) of each pipe
cover 3.
A Cooling pipe and insulation (available from local supplier)
B Unit's gas pipe
C Unit's liquid pipe
D Pipe cover 3
When using commercially available copper pipes: (Fig. 4-5)
A
See that stop valve on outdoor unit is fully shut (unit is shipped with valve shut). After
all piping connections between indoor and outdoor unit have been completed, vacuum-
purge air from system through the service port for the stop valve on the outdoor unit.
1 Apply refrigerating machine oil all over the flare sheet.
B
2 Always use the flare nuts that are attached to the main unit.
A Band 4
D Refrigerant pipe insulation
• To prevent Refrigerant pipes from gathering moisture, wrap the pipes that are in the
unit's pipe storage space with the felt tape provided 5.
5.1. Drainage piping work (Fig. 5-1)
• Drain pipes should have an inclination of 1/100 or more.
• For extension of the drain pipe, use a soft hose (inner dia. 15 mm) available on the
market or hard vinyl chloride pipe (VP-20). Make sure that there is no water leak-
age from the connections.
• If the drain pipe passes indoors it must be covered with insulating material (foamed
polyethylene: specific gravity: 0.03, thickness: 9 mm or more) available on the market.
• Do not put the drain piping directly in a drainage ditch where sulphuric gas may be
generated.
• When piping has been completed, check that water flows from the end of the drain
pipe.
A Drain connection socket
B On site drain pipe (VP-20)
Caution:
The drain pipe should be installed according to this Installation Manual to en-
sure correct drainage. Thermal insulation of the drain pipes is necessary to
prevent condensation. If the drain pipes are not properly installed and insu-
lated, condensation may drip on the ceiling, floor or other possessions.
D Drain hose
E Left-side piping
F Right-side piping
D Remote controller cable through hole
E Corner box
E Bands 4
F On site gas pipe
G On site liquid pipe
B Tightly wrapped C Refrigerant pipe
E Pipe cover 3
C Indoor unit's drain hose
5