30,000 BTU/h Type only
8
2. ADDITIONAL CHARGE
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.
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.
• When using an auxiliary pipe, make sure that the fasten-
er used is insulated in the same way.
(1) When charging the refrigerant,
always use a measuring cylinder.
(2) Add refrigerant from the charging valve
after the completion of the work.
After connecting the piping, check the joints
for gas leakage with gas leak detector.
6. GAS LEAKAGE INSPECTION
7. INSTALLING THE COUPLER HEAT lNSULATION
Fig. 29
Gauge manifold
Valve A
(Small)
Valve B
(Large)
Vacuum
pump
Small pipe
Large pipe
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).
5. VACUUMING AND ADDITIONAL CHARGE
Table 6
Table 5
Cap
Charging valve
Tightening torque
Large valve
Small valve
10.85 to 14.47 ft. lbs (150 to 200 kgf
•
cm)
5.07 to 6.51 ft. lbs (70 to 90 kgf
•
cm)
Open valve state Closed valve state
∗
If the handle is not fully open, performance will drop
and an abnormal sound will be generated.
Cap
Charging
valve
Handle
Service hose
Fig. 30
No gap
Coupler heat
insulation
Nylon fastener (small)
Nylon fastener (large)
Indoor unit
Coupler heat insulation
(small)
Connection pipe
(small)
Connection pipe
(large)
Coupler heat insulation (large)
Indoor unit
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.
25 ft
33 ft
49 ft
99 ft
(7.5 m)
(10 m)
(20 m)
(30 m)
None
1.5 oz
7.5 oz
13.5 oz
(43 g)
(213 g)
(383g)
Pipe length
Additional
refrigerant
Table 7-1
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.
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.
66 ft
99 ft
132 ft
164 ft
(20 m)
(30 m)
(40 m)
(50 m)
None
14.1 oz
28.2 oz
42.3 oz
(400 g)
(800 g)
(1,200g)
Pipe length
Additional
refrigerant
Table 7-2
