Toshiba MMW-UP0271LQ-E Installation Manual page 26

• Use the tightening torque levels as listed in the table
below.
Outer dia. of connecting
Tightening torque (N•m)
pipe (mm)
6.4 14 to 18
9.5 33 to 42
12.7 50 to 62
15.9 63 to 77
• 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.
CAUTION
Tightening with an excessive torque may crack the
nut depending on installation conditions.
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 Airtight test / air purge, etc.
For air tightness test, adding refrigerant, refer to the
Installation Manual attached to the outdoor unit.
CAUTION
• Do not supply power to the indoor unit and the hot
water module until the airtight test and vacuuming
are completed. (If the indoor unit or the hot water
module is powered on, the pulse motor valve is fully
closed, which extends the time for vacuuming.)
• After the vacuuming is completed, carry out the
following procedure before adding refrigerant.
Plate heat exchanger may explode because the
water in the plate heat exchanger frozen.
To avoid this phenomenon, add refrigerant before
carrying out a water supply to the water pipe
system of the Hot Water Module.
 Open the valve fully
Open the valve of the outdoor unit fully.
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 Heat insulation process
Apply heat insulation for the pipes separately at liquid
side and gas side.
• For the heat insulation to the pipes at gas side, use
the material with heat-resisting temperature 120°C
or higher.
• To use the attached heat insulation pipe, apply the
heat insulation to the pipe connecting section of the
hot water module securely without gap.
REQUIREMENT
• Apply the heat insulation to the pipe connecting
section of the hot water module 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).
Hot water module
Union Flare nut
Heat insulator of
the pipe
Heat insulation pipe Banding band
(Accessory) (locally procured)
 Installation of remote
controller (Sold separately)
For installation of the wired remote controller, follow the
Installation Manual attached with the remote controller.
• Pull out the remote controller cord together with the
refrigerant pipe or drain pipe.
Pass the remote controller cord through upper side
of the refrigerant pipe and drain pipe.
• Do not leave the remote controller at a place
exposed to the direct sunlight and near a stove.
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