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2. Mount the piping cover in order to avoid water entering into the
unit. Seal the holes where pipes and wires are inserted, by using a
insulation (field-supplied).
3. If the field-supplied piping is connected with stop valves directly, it is
recommended use a tube bender.
4. Check to ensure that the stop valves are closed completely before
connecting pipes.
5. Connect the field supplied refrigerant pipes to the indoor unit and
outdoor unit. Apply the oil thinly at the seat flare nut and pipe before
tightening.
The required tightening torque is as follows:
Pipe Size
Tightening Torque (Nm)
Ø 6.35 mm
Ø 9.53 mm
Ø 12.70 mm
Ø 15.88 mm
6. After connecting the refrigerant piping, seal the open space between
knockout hole and refrigerant pipes by using insulation material.
Unit
Side
7. Operation of stop valve should be performed according to the figure
below.
Nº
Description
Cap
Allen wrench
Refrigerant Piping
Flare nut
Refrigerant Pressure
Seat Surface
Check Joint
Cap
O-Ring
Spindle valve
Tighten torque (N.m)
Valve type
Model
Liquid Valve: 3~6HP (IVX/ES)
Fig.A
3HP (IVX)
Gas Valve:
4~6HP (ES)
Fig.B Gas Valve
5~6HP (IVX)
PMML0197_r0_04-10.indb 27
INSTALLATION AND OPERATION MANUAL
20
40
60
80
Nº
Description
Insulation Material
Insulation Material
Field Supplied
Insulation Material
Close before shipment
Remaks
Fig.A: Hex 4 mm / Fig.B: Hex. 8 mm
Field Supplied
To Outdoor Unit
Fully closed position
Only the charging those can be connected
Rubber
Open – Counterclockwise
Close – Clockwise
A
B
C
7~9
37
60
16
9~11
34~42
68~82
14~18
9~11
30
60
Outdoor unit stop valve
¡
Do not apply two
spanners at this
position. If applied,
leakage will occur.
CAUTION:
At the test run, fully open the spindle.
If not fully opened, the devices will be damaged.
Do not attempt to turn service valve rod beyond its stop.
Do not loosen the stop ring. If the stop ring is loosened, it is
dangerous since the spindle will hop out.
An excess or a shortage of refrigerant is the main cause of
trouble to the units. Charge the correct refrigerant quantity
according to the description of label at the inside of service
cover.
Check for refrigerant leakage in detail. If a large refrigerant
leakage occurs, it will cause difficulty with breathing or harmful
gases would occur if a fire was being used in the room.
Evacuation and refrigerant charge
¡
Connect the gauge manifold using charging hoses with a vacuum
−
pump or a nitrogen cylinder to the check joints of the liquid line and
the gas line stop valve.
Check for any gas leakage at the flare nut connection, by using
−
nitrogen gas to increase the pressure at 4.15 MPa for outdoor units
inside of the field-supplied piping.
Operate the vacuum pump for 1 to 2 hours until the pressure
−
decreases lower than a pressure of 756 mmHg in vacuum.
For charging refrigerant, connect the gauge manifold using charging
−
hoses with a refrigerant charging cylinder to the check joint of the
liquid line stop valve.
Charge the proper quantity of refrigerant according to the piping
−
length (Calculate the quantity of the refrigerant charge).
Fully open the gas line stop valve, and slightly open the liquid line
−
stop valve.
Charge refrigerant by opening the gauge manifold valve.
−
Charge the required refrigerant within the difference range of ±0.5kg
−
by operating the system in cooling.
Fully open the liquid line stop valve after completing refrigerant
−
charge.
Continue cooling operation for more than 10 minutes to circulate the
−
refrigerant.
Thermal insulation
Gas line
Outdoor unit
D
Manifold
gauge
Vacuum cylinder
9
Example of Evacuation and Refrigerant Charge.
Stop valve
Flare nut
Liquid line
Cover the flare nut and union
Liquid stop valve
of the piping connection with
thermal insulation
Gas stop valve
Insulate the liquid pipe for
prevention of the capacity
decrease according to the
ambient air conditions and the
Nitrogen tank
dewing on the pipe surface by
(For air Tight test
the low pressure
& Nitrogen blow
during brazing)
27
08/07/2010 9:20:41
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