Gas Leakage Inspection; Additional Charge - Fujitsu SPLIT TYPE AIR CONDITIONER Installation Manual

5. VACUUMING AND ADDITIONAL CHARGE
1. VACUUMING
(1) Vacuuming inside the indoor unit and the piping to a
pressure of 1.5 mmHg abs or less from the charging valve
with a vacuum pump.
(2) After vacuuming inside the indoor unit and the piping,
remove the cap of the two valves.
(3) Open the handle of the two valves from the closed state
(Table 5).
(4) Tighten the cap and charging valve of the two valves to
the specified torque (Table 6).
Table 5
Open valve state Closed valve state
Table 6
Tightening torque
Large valve
Cap 10.85 to 14.47 ft. lbs (150 to 200 kgf
Charging valve 5.07 to 6.51 ft. lbs (70 to 90 kgf
∗ If the handle is not fully open, performance will drop
and an abnormal sound will be generated.
Fig. 29
Valve A
Valve B
(Small) (Large)
Large pipe
Small pipe
Handle
Charging
valve

2. ADDITIONAL CHARGE

30,000 BTU/h Type only
Refrigerant suitable for a piping length of 25ft. (7.5 mm) is
charged in the outdoor unit at the factory.
When the piping is longer than 25ft. (7.5 mm), additional
charging is necessary.
For the additional amount, see the table below.
Table 7-1
25 ft 33 ft
Pipe length
(7.5 m) (10 m)
Additional 1.5 oz
None
refrigerant
(43 g)
Between 25 ft (7.5 m) and 99 ft (30 m), when using a
connection pipe other than that in the table, charge
additional refrigerant with 0.6 oz (17 g)/3.3 ft (1 m) as
the criteria.
Small valve
cm)
•
cm)
•
Gauge manifold
Vacuum
pump
Cap
Service hose
49 ft 99 ft
(20 m) (30 m)
7.5 oz 13.5 oz
(213 g) (383g)
36,000 BTU/h Type only
Refrigerant suitable for a piping length of 66ft. (20 mm) is
charged in the outdoor unit at the factory.
When the piping is longer than 66ft. (20 mm), additional
charging is necessary.
For the additional amount, see the table below.
Table 7-2
66 ft
Pipe length
(20 m)
Additional
None
refrigerant
Between 66 ft (20 m) and 164 ft (50 m), when using a
connection pipe other than that in the table, charge
additional refrigerant with 1.41 oz (40 g)/3.3 ft (1 m)
as the criteria.
(1) When charging the refrigerant,
always use a measuring cylinder.
(2) Add refrigerant from the charging valve
after the completion of the work.

6. GAS LEAKAGE INSPECTION

After connecting the piping, check the joints
for gas leakage with gas leak detector.
7. INSTALLING THE COUPLER HEAT lNSULATION
After checking for gas leaks, insulate by wrapping insulation
around the two parts (large and small) of the indoor unit
coupling, using the coupler heat insulation.
After installing the coupler heat insulation, wrap both ends
with vinyl tape so that there is no gap.
Secure both ends of the heat insulation material using nylon
fasteners.
Fig. 30
Coupler heat insulation (large)
Indoor unit
Nylon fastener (large)
Indoor unit
Nylon fastener (small)
• When using an auxiliary pipe, make sure that the fasten-
er used is insulated in the same way.
8
99 ft 132 ft 164 ft
(30 m) (40 m) (50 m)
14.1 oz 28.2 oz 42.3 oz
(400 g) (800 g) (1,200g)
Connection pipe
(large)
Connection pipe
(small)
Coupler heat insulation
(small)
No gap
Coupler heat
insulation