Installation Place; Refrigerant Piping Connection; Evacuating - Toshiba RAS-07 series Installation Manual

Installation Place

• A place which provides the spaces around the outdoor unit as
shown in the diagram
• A place which can bear the weight of the outdoor unit and does
not allow an increase in noise level and vibration
• A place where the operation noise and discharged air do not
disturb your neighbors
• A place which is not exposed to a strong wind
• A place free of a leakage of combustible gases
• A place which does not block a passage
• When the outdoor unit is to be installed in an elevated position,
be sure to secure its feet.
• An allowable length of the connecting pipe is up to 10 m.
• An allowable height level is up to 5 m.
• A place where the drain water does not raise any problems
CAUTION
1. Install the outdoor unit without anything blocking the air
discharging.
2. When the outdoor unit is installed in a place always exposed
to strong wind like a coast or on a high storey of a building,
secure the normal fan operation using a duct or a windshield.
3. In particularly windy areas, install the unit such as to avoid
admission of wind.
4. Installation in the following places may result in trouble.
Do not install the unit in such places.
• A place full of machine oil
• A saline-place such as the coast
• A place full of sulfide gas
• A place where high-
frequency waves are likely
to be generated as from
audio equipment, welders,
and medical equipment

Refrigerant Piping Connection

1. Cut the pipe with a pipe cutter.
90
2. Insert a flare nut into the pipe and flare the pipe.
• Projection margin in flaring : A (Unit : mm)
Outer dia.
A
of copper pipe
∅6.35
Die
Pipe
∅9.52
Tightening connection
Align the centers 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 shown in the figure.
CAUTION
Do not apply excess torque. Otherwise, the nut may crack
depending on the conditions.
OUTDOOR UNIT
Strong
wind
Obliquity Roughness
A
Rigid Imperial
0.5 to 1.0 1.0 to 1.5
0.5 to 1.0 1.0 to 1.5
Outer dia. of copper pipe
∅6.35 mm
∅9.52 mm
• Tightening torque of flare pipe connections
Flare at
indoor unit side
Flare at
outdoor unit side
Externally
threaded side
Use a wrench to secure.
CAUTION
• KEEP IMPORTANT 4 POINTS FOR PIPING WORK.
(1) Take away dust and moisture (inside of the connecting pipes).
(2) Tighten the connections (between pipes and unit).
(3) Evacuate the air in the connecting pipes using a VACUUM
PUMP.
(4) Check gas leak (connected points).
After the piping has been connected to the indoor unit, you can
perform the air purge together at once.
AIR PURGE
Evacuate the air in the connecting pipes and in the indoor unit
using a vacuum pump. Do not use the refrigerant in the outdoor
unit. For details, see the manual of the vacuum pump.
Warp
Using a vacuum pump
Be sure to use a vacuum pump with counter-flow prevention
function so that inside oil of the pump does not flow backward into
pipes of the air conditioner when the pump stops.
1. Connect the
charge hose from
the manifold valve
to the service port
of the packed
valve at gas side.
2. Connect the
charge hose to the
port of the vacuum
pump.
3. Open fully the low
pressure side
handle of the
gauge manifold
valve.
7
Tightening torque
16 to 18 (1.6 to 1.8 kgf·m)
30 to 42 (3.0 to 4.2 kgf·m)
Half union Flare nut
Internally
threaded side
Use a torque wrench to tighten.

Evacuating

Compound
Pressure gauge
pressure gauge
–101 kPa
(–76 cmHg)
Handle Lo
Charge hose
Connecting pipe
Packed valve at gas side
Service port (Valve core (Setting pin))
Packed valve at liquid side
(Unit : N·m)
Mark line
Manifold valve
Handle Hi
(Keep full closed)
Charge hose
Vacuum pump adapter
for counter-flow
prevention
Vacuum
pump
EN