718
V MULTI
(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.
¡ 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.
Internal hook
IMPORTANT
(c) Leak test and air purge
Perform the procedure according to the following instructions.
Request ¡ Perform the air purge of Indoor unit and refrigerant piping by vacuuming method without fail.
Model FDC508HES3
3) After completion of vacuuming,
remove the cap nut for the valve
stem and fully open the service
valve (for both of liquid and gas)
as shown in the right illustration.
After confirming that the valve is
fully open, tighten the cap nuts (for
valve stem and charge port).
Air purge
2) While holding the service
valves (both of liquid and gas
sides) of the Outdoor unit at
fully closed position, per-
form vacuuming at –0.1 MPa
(–76 cmHg) or under from
the service valve charge port.
Leak test
1) After tightening all flared nuts on the Indoor
unit and Outdoor unit, hold the service valves
(both of liquid and gas sides) of the Outdoor
unit in fully closed position and perform the
leak test from the charge port of service valve
to confirm that there is no leakage.
Use nitrogen gas for leak test. Execute
the test at the pressure of 3.0 MPa
(30kgf/cm
2
G).
()
Open
Hexagonal Head Wrench
(Size 4)
Liquid service valve Gas service valve
Handle
Pin
¡ Take care so that the piping to be worked does not contact the parts contained in the unit.
If it contacts the inner parts, abnormal sound or vibration may occur.
Open state
ø 9.52, ø 12.7: 40 to 50 (N·m),
(4 to 5 (kg·m))
ø 15.88: 90 to 120 (N·m),
(9 to 12 (kg·m))
ø 19.05: 100 to 140 (N·m),
(10 to 14 (kg·m))
Models FDC808HES3, 1008HES3
ø 6.35: 16 to 20 (N·m),
(1.6 to 2.0 (kg·m))
1) How to remove the service panel (Only case of FDC508HES3)
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, left (FDC808, 1008 type)
front, rear and botton 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.
Model FDC508HES3
Rear side connection
Right side connection
Down side connection
Liquid piping
Gas piping
}
Electric wires
{
Electric wires
Liquid gas piping
}
Liquid and
gas piping
Electric wires
{
Liquid and gas
piping
Front side connection
Left
connection
Front
connection
Back
connection
Right
connection
Botton
connection
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