Toshiba RBM-PMV0363E Installations-Handbuch Seite 6

5
REFRIGERANT PIPING
Pipe forming/End positioning
Flaring
1. Cut the pipe by a pipe cutter.
OK NO GOOD
Obliquity Roughness
90°
2. Insert a flare nut into 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 copper pipe.
A
Flaring diam. Meter size:
A (Unit: mm)
+0
A
- 0.4
Outer dia. of copper pipe
R410A
6.4 9.1
9.5 13.2
∗ In case of flaring for R410A with the conventional
flare tool, pull it out approx. 0.5mm more than that
for R22 to adjust to the specified flare size.
The copper pipe gauge is useful for adjusting
projection margin size.
Projection margin in flaring:
B (Unit: mm)
Rigid (Clutch type)
R410A tool used Conventional tool used
Outer dia. of
copper pipe
R410A R410A
6.4 0 to 0.5 1.0 to 1.5
9.5 0 to 0.5 1.0 to 1.5
Imperial (Wing nut type)
Outer dia. of copper pipe R410A
6.4 1.5 to 2.0
9.5 1.5 to 2.0
EN-9
Connection of refrigerant pipe
Connect all the refrigerant pipes with flare
connecting work.
• Since the atmospheric pressure only is sealed
as the sealing gas, it is not abnormal that
"Pushu..." sound is not heard when the flare
nut is removed.
Warp
• Be sure use two spanners for pipe connecting
work of the indoor unit.
Work using two spanners
• Refer to the following table for tightening torque.
Connecting pipe Tightening torque Re-tightening
outer dia. (mm) (N m) torque (N m)
14 to 18
Ø6.4
(1.4 to 1.8 kgf•m)
33 to 42
Ø9.5
(3.3 to 4.2 kgf•m)
REQUIREMENT
If an excessive torque is applied, the nut may crack
depending on the installation conditions.
B
6
Airtight test/Air purge, etc.
For airtight test, air purge, addition of refrigerant, and gas leak check, follow the Installation Manual
attached to the outdoor unit.
REQUIREMENT
Be sure to use the tool such as charge hose exclusive to R410A.
Do not turn on the power until the airtight test and the vacuuming have finished.
(If turning on the power, the incorporated PMV is closed fully and the period until the vacuuming finishes
elongates.)
Open fully valves of the outdoor unit
Gas leak check
Check with a leak detector or soap water whether gas leaks or not, from the pipe connecting section or
cap of the valve.
REQUIREMENT
Use a leak detector manufactured exclusively for HFC refrigerant (R410A, R134a, etc.).
18
(1.8 kgf•m)
Heat insulating process
42
Perform heat insulating for pipes at liquid side and gas
(4.2 kgf•m)
side separately.
In cooling time, temperature at both liquid and gas
sides becomes lower.
Therefore, perform heat insulating process sufficiently
to avoid dewing.
• For heat insulator of pipe at gas side, be sure to use
one with heat-resisting temp. 120°C or more.
• Using the attached heat insulating pipe, perform heat
insulating process securely for pipe connecting part
of the PMV Kit without clearance.
REQUIREMENT
Apply the heat insulation to the pipe connecting section of the PMV Kit securely up to the root without
exposure of the pipe. (The pipe exposed to the outside causes water leak.)
PMV Kit
Union Flare nut
Binding band
(Attached)
Heat insulating pipe Heat insulator
(Attached)
EN-10
EN