Refrigerant Piping - Carrier TOSHIBA MMK-UP0071HP-UL Service Manual

9

REFRIGERANT PIPING

Refrigerant Piping
Flare nut and flare works are also different
from those of the conventional refrigerant.
Take out the flare nut attached to the main
unit of the air conditioner, and use it.
REQUIREMENT
When the refrigerant pipe is long, provide
support brackets at intervals of 8'2"- 9'10"
(2.5-3 m) to clamp the refrigerant pipe. Otherwise,
abnormal sound may be generated.
CAUTION
IMPORTANT 4 POINTS FOR PIPING WORK
1. Remove dust and moisture from the inside of
the connecting pipes.
2. Tight connection (between pipes and unit)
3. Evacuate the air in the connecting pipes using
VACUUM PUMP.
4. Check the gas leakage. (Connected points)
Pipe size
MMK-
Gas side
Liquid side
(dia.: in (mm))
UP007 to UP012 type
3/8" (9.5)
1/4" (6.4)
- 120 -
Permissible Piping Length and
Height Difference
They vary according to the outdoor unit.
For details, refer to the Installation Manual attached
to the outdoor unit.
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 R410A differ from those of
refrigerant R22, the flare tools newly
manufactured for R410A are recommended.
However, the
conventional tools can
be used by adjusting
projection margin of the
copper pipe.
Projection margin in flaring: B (Unit: in (mm))
RIDGID (Clutch type)
R410A tool used
Outer dia. of
copper pipe
R410A
1/4" (6.4) , 3/8" (9.5)
0-0.02" (0-0.5)
1/2" (12.7) , 5/8" (15.9)
Flaring dia. meter size: A (Unit: in (mm))
Outer dia. of copper pipe
1/4" (6.4)
3/8" (9.5)
1/2" (12.7)
5/8" (15.9)
* In case of flaring for R410A with the
conventional flare tool, pull it out
approx. 0.02" (0.5 mm) more than
that for R22 to adjust to the specified
flare size. The copper pipe gauge is
useful for adjusting projection margin
size.
B
Conventional
tool used
R410A
0.04"-0.06" (1.0-1.5)
R410A
0.4" (9.1)
0.5" (13.2)
0.7" (16.6)
0.8" (19.7)
A