Refrigerant Piping - Carrier TOSHIBA MMK-UP0151HP-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
UP015 to
Model
UP018 type
Gas side 1/2" (12.7)
Liquid side 1/4" (6.4)
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)
Outer dia. of
copper pipe
(dia.: in (mm))
1/4" (6.4) , 3/8" (9.5)
1/2" (12.7) , 5/8" (15.9)
UP024 type
Flaring dia. meter size: A (Unit: in (mm))
5/8" (15.9)
3/8" (9.5)
Outer dia. of copper pipe
* 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.
- 120 -
R410A tool used
R410A
0 - 0.02" (0 - 0.5)
1/4" (6.4)
3/8" (9.5)
1/2" (12.7)
5/8" (15.9)
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