10
Fig. 31
Refrigerant pipe
3-way valve
Outdoor
unit
Service hose
with valve
core
Blank cap
Charging
valve
Cap
Service hose
Gauge
manifold
Vacuum
pump
6. VACUUM PROCESS
1. VACUUM
(1) Remove the cap, and connect the gauge manifold
and the vacuum pump to the charging valve by the
service hoses.
(2) Vacuum the indoor unit and the connecting pipes until
the pressure in them lowers to below 1.5 mmHg.
(3) Disconnect the service hoses and fit the cap to the
charging valve (Tightening torque : 70 to 90 kgf
•
cm).
(4) Remove the blank caps, and fully open the spindles
of the 2-way and 3-way valves with a hexagon
wrench (Torque : 2-way valve : 70 to 90 kgf
•
cm,
3-way valve : 100 to 120 kgf
•
cm).
(5) Tighten the blank caps of the 2-way valve and 3-way
valve to the specified torque (200 to 250 kgf
•
cm).
2. ADDITIONAL CHARGE
Refrigerant suitable for a piping length of 5 m is
charged in the outdoor unit at the factory.
When the piping is longer than 5 m, additional charg-
ing is necessary.
For the additional amount, see the table below.
Between 5 m and 20 m, when using a connection pipe
other than that shown in the table, charge additional
refrigerant with 0.42 oz (12g) / 3.3 ft (1 m) as the criteria.
(1) Always pump down the piping
before use.
(2) Add refrigerant from the charging
valve after the completion of the
work.
Table 5
25 ft
33 ft
49 ft
66 ft
(7.5 m)
(10 m)
(15 m)
(20 m)
None
2.1 oz
4.2 oz
6.3 oz
(60 g)
(120 g)
(180 g)
Pipe length
Additional
refrigerant
7. HOW TO CONNECT WIRING TO THE TERMINALS
A. For solid core wiring (or F-cable)
(1) Cut the wire end with a wire cutter or wire cut-
ting pliers, then strip the insulation to about
15/16” (25 mm) to expose the solid wire.
(2) Using a screwdriver, remove the terminal screw
(s) on the terminal board.
(3) Using pliers, bend the solid wire to form a loop
suitable for the terminal screw.
(4) Shape the loop wire properly, place it on the ter-
minal board and tighten securely with the termi-
nal screw using a screwdriver.
B. For strand wiring
(1) Cut the wire end with a wire cutter or wire cut-
ting pliers, then strip the insulation to about 3/8”
(10 mm) to expose the strand wiring.
(2) Using a screwdriver, remove the terminal screw
(s) on the terminal board.
(3) Using a round terminal fastener or pliers, securely
clamp a round terminal to each stripped wire end.
(4) Position the round terminal wire, and replace and
tighten the terminal screw with a screwdriver.
Fig. 32
Solid wire
Strand wire
Loop
Insulation
Strip 15/16”
(25 mm)
Strip 3/8”
(10 mm)
Screw with
special washer
Round
terminal
Terminal
board
Round
terminal
Screw with
special washer
Round terminal
Wire
Wire
Terminal block
