Refrigerant Piping - Carrier 40TGF UP Series Installation Manual

6

Refrigerant piping

CAUTION CAUTION
Use flare nuts that are included with the unit. Using
different flare nuts may cause refrigerant gas leakage.
 Refrigerant piping
Use the following item for the refrigerant piping.
Material: Seamless phosphorous deoxidized
copper pipe.
Ø6.35, Ø9.52, Ø12.7 Wall thickness 0.8 mm or more
Ø15.88, Ø19.1 Wall thickness 1.0 mm or more
REQUIREMENT
When the refrigerant pipe is long, provide support
brackets at intervals of 2.5 - 3 m to clamp the refrigerant
pipe. Otherwise, abnormal sound may be generated.
Permissible piping length and
height difference
They vary depending on the outdoor unit. For details,
refer to the Installation Manual attached to the outdoor
unit.
CAUTION CAUTION
IMPORTANT 4 POINTS FOR PIPING WORK
1. Reusable mechanical connectors and flared joints are
not allowed indoors. When mechanical connectors
are reused indoors, sealing parts shall be renewed.
When flared joints are reused indoors, the flare part
shall be refabricated.
2. Tight connection (between pipes and unit)
3. Evacuate the air in the connecting pipes by using
VACUUM PUMP.
4. Check the gas leakage. (Connected points)
Pipe size
0241UP,
0131UP,
Model 0301UP,
0181UP
0361UP,
Gas side Ø12.7 mm Ø15.9 mm
Pipe size
Liquid side Ø6.4 mm Ø9.5 mm
25-EN
Connecting refrigerant piping
Flaring
Cut the pipe with a pipe cutter.
Remove burrs completely.
Remaining burrs may cause gas leakage.
Insert a flare nut into the pipe, and flare the pipe.
As the flaring sizes of R32 differ from those of
refrigerant R22, the flare tools newly manufacetured
for R32 are recommended.
However, the conventional tools can be used by
adjusting projection margin of the copper pipe.
Projection margin in flaring: B (Unit: mm)
Outer dia. of
Tool used
copper pipe
6.4, 9.5
0 to 0.5
12.7, 15.9, 19.1
Flaring diameter size: A (Unit: mm)
Outer dia. of copper pipe
6 4 .
9 5 .
1 2 7 .
1 5 9 .
19.1
CAUTION
when removing burrs.
on the inner surface of flare processing part will
cause refrigerant gas leak.
0401UP Check that the flared part is not scratched, deformed,
0481UP stepped, or flattened, and that there are no chips
0601UP
adhered or other problems, after flare processing.
surface.
Ø19.1 mm
* In case of flaring with the conventional flare tool,
Ø9.5 mm
pull it out approx. 0.5 mm more than that for R22 to
adjust to the specified flare size. The copper pipe
gauge is useful for adjusting projection
– 13 –
The sealed gas was sealed at the atmospheric
pressure so when the flare nut is removed, there will
no "whooshing" sound: This is normal and is not
indicative of trouble.
Use two wrenches to connect the indoor unit pipe.
Use the tightening torque levels as listed in the
following table.
Outer dia. of connecting
Conventional
pipe (mm)
tool used
6.4
1.0 to 1.5
9.5
12.7
15.9
19.1
Tightening torque of flare pipe connections
Incorrect connections may cause not only a gas leak,
but also a trouble of the refrigeration cycle.
Align the centres of the connecting pipes and tighten
the flare nut as far as possible with your fingers. Then
tighten the nut with a spanner and torque wrench as
A +0
–0.4
shown in the figure.
9 1 .
1 3 2 .
CAUTION
1 6 6 .
Tightening with an excessive torque may crack the nut
1 9 7 .
depending on installation conditions.
24.0
Evacuation
Perform vacuuming from the charge port of valve of the
outdoor unit by using a vacuum pump.
For details, follow to the Installation Manual attached to
the outdoor unit.
Do not use the refrigerant sealed in the outdoor unit
for evacuation.
REQUIREMENT
For the tools such as charge hose, use those
manufactured exclusively for R32.
Refrigerant amount to be added
For addition of the refrigerant, add refrigerant "R32
referring to the attached Installation Manual of
outdoor unit.
Use a scale to charge the refrigerant of specified
margin size. amount.
REQUIREMENT
Charging an excessive or too little amount of
refrigerant causes a trouble of the compressor.
Charge the refrigerant of specified amount.
A personnel who charged the refrigerant should write
down the pipe length and the added refrigerant
amount in the F-GAS label of the outdoor unit. It is
necessary to fix the compressor and refrigeration
cycle malfunction.
Open the valve fully
Open the valve of the outdoor unit fully. A 4 mm-
hexagonal wrench is required for opening the valve.
Work using double spanner
For details, refer to the Installation Manual attached to
the outdoor unit.
Gas leak check
Check with a leak detector or soap water whether gas
Tightening torque (N m)
leaks or not, from the pipe connecting section or cap of
14 to 18 (1.4 to 1.8 kgf m) the valve.
34 to 42 (3.4 to 4.2 kgf m)
REQUIREMENT
49 to 61 (4.9 to 6.1
Use a leak detector manufactured exclusively for HFC
63 to 77 (6.3 to 7.7
refrigerant (R32, R134a, R410A, etc).
95 to 115 (9.5 to 11.5
Heat insulation process
Apply heat insulation for the pipes separately at liquid
side and gas side.
For the heat insulation to the pipes at gas side, use
the material with heat-resisting temperature 120 °C
or higher.
To use the attached heat insulation pipe, apply the
heat insulation to the pipe connecting section of the
indoor unit securely without gap.
REQUIREMENT
Apply the heat insulation to the pipe connecting
section of the indoor unit securely up to the root
without exposure of the pipe. (The pipe exposed to the
outside causes water leak.)
Wrap heat insulator with its slits facing up
(ceiling side).
Indoor unit
"
Heat insulation
pipe
(Accessory)
Wrap the pipe with the attached heat insulator
without any gap between the indoor unit.
The seam must be faced upward
(ceiling side).
Flare nut
Heat insulator
of the pipe
Union Banding band
(locally
procured)
26-EN