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REFRIGERANT PIPING & REFRIGERANT CHARGE
CORRECT
Outdoor Unit
is Stable.
Frame
Recommended Metal Plate Size (Field-Supplied)
8 REFRIGERANT PIPING & REFRIGERANT CHARGE
8.1 PIPING MATERIALS
1 Prepare locally-supplied copper pipes.
2 Select the piping size with the correct thickness and correct
material which can have sufficient pressure strength.
3 Select clean copper pipes. Make sure there is no dust and
moisture inside. Blow the inside of the pipes with oxygen
free nitrogen to remove any dust and foreign materials
before connecting pipes.
!
C A U T I O N
•
Cap the end of the pipe when pipe is to be inserted through a hole
•
Do not put pipes on the ground directly without a cap or vinyl tape at
the end of the pipe
•
If piping installation is not completed until next day or over a longer
period of time, braze off the ends of the piping and charge with
oxygen free nitrogen through a Schrader valve type access fitting to
prevent moisture and particle contamination.
•
Ensure to connect the piping among the units in the same refrigerant
cycle.
•
Do not use insulation material that contains NH3 because it can
damage cooper pipe material and can be a source of future leakage.
•
Completely insulate both refrigerant gas piping and liquid piping
between the indoor unit(s) and the outdoor unit.
If not insulated, dew will occur on the piping surface.
8.2 PIPING CONNECTION FOR OUTDOOR UNIT
Gas pipe accessory (8 and 10 HP)
The gas pipe accessory with a flare nut (factory-supplied silencer) shall be brazed to the field supplied gas line, and connected to
the gas valve.
11
PMML0390B REV.0 - 11/2015 - P5416649
Base Without of Outdoor Unit
100mm
Metal Plate
Metal Plate
100mm or more
Material: Hot-Rolled Mild Steel Plate (SPHC)
Plate Thickness: 4.5T
!
D A N G E R
•
Use refrigerant R410A in the refrigerant cycle.
•
Do not charge oxygen, acetylene or other flammable and
poisonous gases into the refrigerant cycle when performing a
leakage test or an air-tight test.
•
These types of gases are extremely dangerous and can cause an
explosion. It is recommended that compressed air, nitrogen or
refrigerant be used for these types of tests.
•
Check to ensure that no pressure exists inside the stop valve
before removing the flange.
?
N O T E
•
A system with no moisture or oil contamination will give maximum
performance and lifecycle compared to that of a poorly prepared
system. Take particular care to ensure all copper piping is clean and
dry internally.
•
There is no refrigerant in the cycle of the indoor unit.
•
Do not place the pipe directly on the ground.
Correct
Incorrect
Hole
Hole
Attach a cap or vinyl tape
Correct
Attach a cap or vinyl tape
4-C10
2-Long Hole
Correct
Incorrect
Rain water can enter
Attach a cap or vinyl bag
with rubber band.
Incorrect
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