Tightening Connection - Toshiba MMU-AP0092H Installation Manual

SMMS 4-way Air Discharge Cassette Type

Tightening connection

• Do not apply excessive torque. Otherwise, the
nut may crack depending on the conditions.
Outer dia. of copper
pipe
6.4 mm (dia.)
9.5 mm (dia.)
12.7 mm (dia.)
15.9 mm (dia.)
▼ Tightening torque of flare pipe connections
Pressure of R410A is higher than that of R22.
(Approx. 1.6 times) Therefore, using a torque
wrench, tighten the flare pipe connecting sections
which connect the indoor and outdoor units of the
specified tightening torque.
Incorrect connections may cause not only a gas
leak, but also a trouble of the refrigeration cycle.
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.
Work using double spanner
REQUIREMENT
Tightening with an excessive torque may crack
the nut depending on installation conditions.
Tighten the nut within the specified tightening
torque.
Piping with outdoor unit
• Shape of valve differs according to the outdoor
unit.
For details of installation, refer to the Installation
Manual of the outdoor unit.
CAUTION
(Unit : N•m)
Tightening torque
14 to 18 (1.4 to 1.8 kgf•m)
33 to 42 (3.3 to 4.2 kgf•m)
50 to 62 (5.0 to 6.2 kgf•m)
68 to 82 (6.8 to 8.2 kgf•m)
– 16 –
Airtight test/Air purge, etc.
For airtight test, air purge, addition of refrigerant,
and gas leak check, refer to the Installation
Manual attached to the outdoor unit.
REQUIREMENT
Do not supply power to the indoor unit until the
airtight test and vacuuming are completed. (If the
indoor unit is powered on, the pulse motor valve is
fully closed, which extends the time for
vacuuming.)
Open the valve fully
Open the valve of the outdoor unit fully.
For details, refer to the Installation Manual
attached to the outdoor unit.
Thermal insulation process
Apply thermal insulation for the pipes separately
at liquid side and gas side.
For the thermal insulation to the pipes at gas side,
be sure to use the material with heat-resisting
temperature 120°C or higher.
Using the attached thermal insulation material,
apply the thermal insulation to the pipe connecting
section of the indoor unit securely without gap.
REQUIREMENT
• Apply the thermal 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
Union
Heat insulation pipe
Flare nut
(Accessory)
Installation Manual
EN
Heat
insulator of
the pipe
16-EN