Specifications

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75
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(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) Extract air from the
service valve charge
port with the outdoor
unit service valves
(both liquid and gas
sides) shut until the
pressure drops to -101
kPa (-755mmHg) or
lower, and con-tinue to
extract air for at least
one hour thereafter.
Leak test
(1) The unit's air-tightness test has been conducted but after
completing the piping connections conduct an air-tightness
test of the connected piping and the indoor units using the
outdoor gas side service valve check joint. Be sure to conduct
this test with the service valve closed.
1 When the pressure has been increased to 0.5 MPa stop
increasing the pressure and maintain this state for at least
5 min. to check if the pressure drops.
2 Next, increase the pressure to 1.5 MPa and again maintain
this state for at least 5 min. to check if the pressure drops.
3 Then increase the pressure to 3.3 MPa and maintain this
state for approx. one day to check if the pressure drops.
Use nitrogen gas for the air-tightness check.
Open
Hexagonal Head Wrench
(Size 4)
Liquid service valve
(d) Charging with additional refrigerant
The length of piping will require charging with additional refrigerant. Refer to the table below for making the additional charge.
If your calculations show that the additional charge amount is a minus number, charging is not required.
Note (1) Use the table above to find the amount of additional charge (kg/m) C per 1
meter of piping.
Method of Calculation
Refer to the example of calculation on the next page for the piping length code in the formula (L, 1, ~ 3).
For additional charging G = Amount of additional charge (kg.)
Twin and triple specifications
G = main piping L (m) × C + branch piping length 1 (m) × f + branch piping length 2 (m) × f + branch piping 3 (m) × f – (D – B)
(only for triple specifications)
¡ f = Additional charge amount per 1 meter
of branch piping
208, 258, 308: 0.025kg/m
408, 508: 0.035kg/m
Amount
Piping length already
charged with refrigerant.
Standard refrigerant volume.
(When piping is 0 meters.)
Additional charge volume
per 1 meter of main piping.
Amount of charge
at time of shipping
Item
FDCP808 FDCP1008
55
4.73 6.75
0.045 0.07
4.95 7.10
A (m)
B (kg)
C (kg/m)
D (kg)
Double twin specification
G = main piping L (m) × C + branch piping L
1(m) × f + branch piping L2 (m) × f + branch piping 1 (m) × f
+ branch piping 2 (m) × f + branch piping 3 (m) × f + branch piping 4 (m) × f - (D - B)
(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.
S
0
_
S
0
_
Open
position
Stopper
Pin
gas service valve
Factory setting
(Close position)