Air Purging - AUX AM Serie Manual De Usuario E Instalacion

D: Flaring work
Firmly hold copper pipe in a die in the
dimension shown in the table below.
Outer diam.
(mm)
6.35
9.53
12.7 12.7
Tightening connection
Align the center of the pipes.
Sufficiently tighten the flare
nut with fingers, and then tighten
it with a spanner and torque wrench
as shown in Fig.58 & 59
Outer Tightening
diam. torque(N.cm)
1500
6.35
(153kgf.cm)
2500
9.52
(255kgf.cm)
3500
12.7
(357kgf.cm)
Caution
Excessive torque can break nut
depending on installation conditions.

Air purging

Air and moisture in the refrigerant system have undesirable effects as indicated below:
● Pressure in the system rises.
● Operating current rises.
● Cooling or heating efficiency drops.
● Moisture in the refrigerant circuit may freeze and block capillary tubing.
● Water may lead to corrosion of parts in the refrigeration system.
Therefore, the indoor unit and tubing between the indoor and outdoor unit must be leak tested
and evacuated to remove any noncondensables and moisture from the system.
Air purging w ith vacuum pump
Preparation
●
Check that each tube(both liquid and gas side tubes) between the indoor and outdoor units
have been properly connected and all wiring for the test run has been completed. Remove
the service valve caps from both the gas and the liquid side on the outdoor unit. Note that
both the liquid and the gas side service valves on the outdoor unit are kept closed at this
stage.
● Pipe length and refrigerant amount:
When relocate the unit to another place,
perform evacuation using vacuum pump.
Make sure the refrigerant added into the air
conditioner is liquid form in any case.
Caution in handling the pac k ed valve
Open the valve stem until it hits against the
stopper. Do not try to open it further.
Securely tighten the valve stem cap with a
spanner or the like.
Valve stem cap tightening torque (See
Tightening torque table in previous page ).
REFRIGERANT PIPE CONNECTION
A(mm)
Max.
Min.
1.3 0.7
1.6 1.0
1.8 1.8
1.0 1.0
Additional tightening
torque(N.cm)
1600
(163kgf.cm)
2600
(265kgf.cm)
3600
(367kgf.cm)
39
Bar
Bar
Copper pipe
Clamp handle
Fig.57
Indoor unit tubing Flare nut Pipings
Refrigerant
Outdoor
unit
A
Gas side
Liquid side
B
Packed valve
Flare nut
Stopper
Valve body
Valve stem
Handle
Yoke
Cone
Red arrow mark
Fig.58
Fig.59
Indoor
unit
C
D
Half union
Fig.65
Cap
Fig.66