Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 342

FDT ( N ) -H
(3) Refrigerant piping work
Select the piping specification to fit the specification of Indoor unit and installation location.
(a) Decision of piping specification
Outdoor unit
(b) Piping work
Request
¡ Use the pipe made of following material. Moreover, it is very convenient for you to use the separately sold piping kit.
Material: Phosphor deoxidized seamless copper tube (C1220T, JIS H3300)
¡ In the case of this unit, condensation water is also generated on the liquid piping. Insulate both of the liquid piping and
gas piping perfectly.
¡ In the case of heat pump type unit, the maximum temperature of the gas piping reaches approx. 120˚C, therefore use the
insulation material which has sufficient heat resistance.
¡ When bending the pipe, bend it with large radius as much as possible. Do not bend the same portion of pipe repeatedly.
¡ Do not let dust, chips or water enter the pipe while pipe working.
¡ The flared connection for refrigerant piping is required. Flare the pipe after inserting
the flared nut into the pipe.
¡ Tighten the flared connection firmly using 2 of spanners. Comply with the following
value for tightening torque of the flared nut.
ø 6.35: 16 to 20 (N·m),
(1.6 to 2.0 (kg·m))
¡ In the case of brazing connection, perform brazing while flowing nitrogen gas in the pipe to prevent generation of oxide
film inside the pipe without fail.
1) How to remove the service panel
Remove screws on the service panel, pull down the panel
toward the arrow direction, and then remove the panel
toward you.
2) Refrigerant pipe connection
a) The piping can be taken out to the right, front, rear and down directions.
b) Cut the plate at the knockout portion on the piping penetration section with necessary minimum size.
c) Mount the attached edging by cutting it to the appropriate length before connecting the pipe.
Models FDC(P)208~508 type
Front side connection
340
Indoor unit
ø 9.52: 40 to 50 (N·m),
(4 to 5 (kg·m))
Rear side connection
Right side connection
Down side connection
Piping specification
Outdoor unit model Gas pipe
ø 15.88 × t1.0
FDC(P)208
ø 15.88 × t1.0
FDC(P)258, 308
ø 19.05 × t1.0
FDC408, 508
ø 19.05 × t1.2
FDCP408,508
ø 25.4 × t1.2
FDC808
ø 28.58 × t1.4
FDC1008
Maximum one way length
FDC(P)208, 258 : L=30 m or less
FDC(P)308~1008 : L=50 m or less
Height difference
¡ When the position of outdoor unit is higher than that of
the indoor unit, keep the difference H=30 m or less
(FDC(P)208, 258 : H=20 m or less.).
¡ When the position of outdoor unit is lower than that of the
indoor unit, keep the difference H=15 m or less.
ø 15.88: 90 to 120 (N·m),
(9 to 12 (kg·m))
Models FDC808, 1008 type
Electric wires
{
Left
Liquid and
connection
gas piping
Electric wires
{
Front
Liquid and gas
connection
piping
Unit : mm
Liquid pipe
ø 6.35 × t0.8
ø 9.52 × t0.8
ø 9.52 × t0.8
ø 9.52 × t0.8
ø 12.7 × t1.0
ø 15.88 × t1.0
ø 19.05: 100 to 140 (N·m),
(10 to 14 (kg·m))
Internal hook
Liquid piping Back
}
connection
Gas piping
Electric wires Right
}
Liquid gas piping
connection
Botton
connection