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REFRIGERANT PIPING &
REFRIGERANT CHARGE
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
Hex 4 mm
Refrigerant Piping Field Supplied
Cap
Refrigerant
To Outdoor Unit
Pressure
Seat Surface
Fully closed position
Check Joint
Only the charging those can be connected
Cap
O-Ring
Rubber
Open – Counterclockwise
Spindle valve
Close – Clockwise
Tighten torque (N.m)
Valve type / Model
Liquid Valve:
3~5HP
Gas Valve:
3~5HP
PMML138A_R1-eng-fre.indb 27
20
40
60
80
Nº
Description
Insulation Material
Insulation Material
Field Supplied
Insulation Material
Close before shipment
Remaks
A
B
C
7~9
34~42
34~42
14~18
9~11
34~42
68~82
14~18
¡
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.
¡
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
Manifold
gauge
D
Vacuum cylinder
Example of Evacuation and Refrigerant Charge.
PMML0138A-rev.1 - 11/2009
Stop valve
Flare nut
200
200
Cover the flare nut
and union of the
piping connection
Liquid line
with thermal
insulation
Liquid stop valve
Gas stop valve
Nitrogen tank
(For air Tight test & Nitrogen
blow during brazing)
27
19/11/2009 14:45:20
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