Installing The Refrigerant Piping - Mitsubishi Electric PKA-M-HA Installation Manual

4. Installing the refrigerant piping

■ PKA-M·HA(L)
4.3. Indoor unit
Refrigerant and Drainage Piping Sizes
Model
Item
Liquid
Refrigerant piping
Gas
Drainage piping
B
Fig. 4-4
C
Fig. 4-5
8
D
C
F
Fig. 4-3
PKA-M35, M50HA(L)
ODø6.35 (1/4")
ODø12.7 (1/2")
ODø16
A
A
B
D
( B )
( A )
F
4.4. Positioning refrigerant and drain piping (Fig. 4-3)
■ PKA-M·HA(L)
A Gas pipe * Indicates the condition with accessories mounted.
B Liquid pipe
C Drain hose (Effective length: 400)
D Left-side piping knockout hole
E Right-side piping knockout hole
F Lower piping knockout hole
G Mount board 1
4.5. 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 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. The portion where the insulation material is joined is sealed by taping.
A Site-side refrigerant piping
B Unit side refrigerant piping
4.5.1. Storing in the piping space of the unit (Fig. 4-5)
1. Wrap the supplied felt tape in the range of the refrigerant piping which will be
housed within the piping space of the unit to prevent dripping.
2. Overlap the felt tape at one-half of the tape width.
3. Fasten the end portion of the wrapping with vinyl tape, etc.
A Gas pipe
B Liquid pipe
C Indoor/outdoor connection cable
D Felt tape 3
G
E