Ramsond R74GW3 Installation And Repair Manual - page 7
INSTALLATION & REPAIR GUIDE
Split Wall-Mounted air conditioner
Table 1
Torque based upon the wrench to be used
*
Air purging with vacuum pump
1.Check that pipelines connection have been properly
connected,remove the charging port cap,and connect
the manifold gauge and the vacuum pump to the
charging valve by service hoses as shown Fig.6.
2.Open the valve of the low pressure side of manifold
gauge,then,run the vacuum pump.Vacuum the indoor
unit and the connecting pipes until the pressure in
them lowers to below 1.5mmHG(The operation time
for vacuuming is about 10 minutes).When the desired
vacuum is reached,close the valve of the low pressure
of the manifold and stop the vacuum pump.
3.Disconnect the service hoses and fit the cap to
the charging valve.
4.Remove the blank caps,and fully open the spindles
of the 2-way and 3-ways valves with a service valve
wrench.
5.Tighten the blank caps of the 2-way and 3-ways
valves,applying the above torque Table 1.
Lo
Hi
Indoor unit
Outdoor unit
Pressure gauge
Manifold gauge
Vacuum pump
Union nut
Blank cap
Valve stem
Charging
port
Service hose
*
Adding refrigerant
Refrigerant must be added if the piping measures more
than 7.5 mtrs (25'0”) in length.This operation can only
be performed by a professional technician,for the
additional amount,see the table 2 below.
2-way valve
3-way valve
Outer diameter of
copper pipe
Tightening torque
6.35(1/4")
9.52(3/8")
12.7(1/2")
15.88(5/8")
19.05(3/4")
Strengthened tightening torque
160kgf.cm(63kgf.inch)
300kgf.cm(118kgf.inch)
500kgf.cm(197kgf.inch)
750kgf.cm(295kgf.inch)
1200kgf.cm(472kgf.inch)
200kgf.cm(79kgf.inch)
350kgf.cm(138kgf.inch)
550kgf.cm(216kgf.inch)
800kgf.cm(315kgf.inch)
1400kgf.cm(551kgf.inch)
5
Additional refrigerant amount
Liquid pipe diameter 6.35(1/4")
(piping length-5)mx30g
or (piping length-16)ftx0.3oz
Liquid pipe diameter: 9.52(3/8")
(piping length-5)mx65g
or (piping length-16)ftx0.7oz
Table 2
Fig.6