INVENTOR U4MRS-12B, Installation Manual

Page: 19 / 92

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Page 19
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Oil traps
CAUTION
•
If the indoor unit is installed higher than the
outdoor unit:
An oil trap should be installed every 10m
(32.8ft) of vertical suction line riser.
(See Fig. 7.2)
-If oil flows back into the outdoor unit’s
compressor, this might cause liquid
compression or deterioration of oil return.
Oil traps in the rising gas piping can prevent
this.
CAUTION
Fig. 7.2
The indoor unit is installed higher than the
outdoor unit
If the outdoor unit is installed higher than the
indoor unit:
-It is recommended that vertical suction risers
not be upsized. Proper oil return to the
compressor should be maintained with suction
gas velocity. If velocities drop below7.62m/s
(1500fpm (feet per minute)), oil return will be
decreased. An oil trap should be installed every
6m(20ft) of vertical suction line riser.
(See Fig. 7.3)
Fig. 7.3
The outdoor unit is installed higher than the
indoor unit
Pipe
Reamer
Point dow n
Fig. 7.5
Table 7.2
Piping
length
Total piping length
Permitted length
18K+18K 30m/98’ L+Max
(L1, L2)
24K+24K
30K+30K 50m/164’
(farthest distance from
the line pipe branch)
15m/49’ L1, L2
(farthest distance from
the line pipe branch)
10m/32.8’ L1-L2
Drop
height
Drop height between
indoor and outdoor unit
20m/65.6’ H1
Drop height between
two indoor units
0.5m/1.6’ H2
CAUTION
DO NOT
deform pipe while cutting. Be extra
careful not to damage, dent, or deform the pipe
while cutting. This will drastically reduce the
heating efficiency of the unit.
1. Make sure that the pipe is cut at a perfect
90° angle. Refer to Fig. 7.4 for examples
of bad cuts
Oblique
Rough
Warped
90°
Fig. 7.4
Step2: Remove burrs.
Burrs can affect the air-tight seal of refrigerant
piping connection. They must be completely
removed.
1. Hold the pipe at a downward angle to
prevent burrs from falling into the pipe.
2. Using a reamer or deburring tool, remove
all burrs from the cut section of the pipe.
Size of joint pipes for indoor unit
Gas side
Capacity
of indoor
unit (A)
Size of main pipe(mm)
Liquid side
Φ12.7(0.5
”
)
Φ15.9(0.626
”
)
Φ15.9(0.626
”
)
Φ6.35(0.25
”
)
Φ9.5(0.375
”
)
Φ9.5(0.375
”
)
18K
24K
30K
Table 7.3
Size of joint pipes for 410A indoor unit
CE-FQZHN-01C
CE-FQZHN-01C
CE-FQZHN-01C
Available
branching pipe
Size of joint pipes for outdoor unit
Base on the following tables, select the diameters
of the outdoor unit connective pipes. In case of the
main accessory pipe larger than the main pipe, take
the larger one for the selection.
Model
Gas side Liquid side
Φ15.9(0.626
”
)
Φ15.9(0.626
”
)
Φ15.9(0.626
”
)
Φ9.5(0.375
”
)
Φ9.5(0.375
”
)
Φ9.5(0.375
”
)
the size of main pipe(mm)
36K
48K
60K
Table 7.4
Size of joint pipes for 410A outdoor unit
The 1st branching pipe
CE-FQZHN-01C
CE-FQZHN-01C
CE-FQZHN-01C
Step1: Cut pipes
When preparing refrigerant pipes, take extra
care to cut and flare them properly. This will
ensure efficient operation and minimize the
need for future maintenance.
1. Measure the distance between the indoor
and outdoor units.
2. Using a pipe cutter, cut the pipe a little
longer than the measured distance.
Refrigerant Piping Connection Instructions
CAUTION
•
The branching pipe must be installed
horizontally. An angle of more than 10° may
cause malfunction.
•
DO NOT install the connecting pipe until both
indoor and outdoor units have been installed.
•
Insulate both the gas and liquid piping to
prevent water leakage.