Toshiba MMU-AP0121MH - Manual (Page 26)

26
Set notching upward.
Main unit
Pipe side
(Required at the site)
Attached heat insulating pipe
Work using double spanner
• Projection margin in flaring :
B (Unit : mm)
Rigid (Clutch type)
Imperial (Wing nut type)
Connection of refrigerant pipe
Connect all the refrigerant pipes with the flare
connection method
• As the unit is sealed to atmospheric pressure.
It is not abnormal that no “Push....” sound will be
heard upon the removal of the flare nut.
• Ensure use of two spanners for the connecting of the
pipe work to the indoor unit.
• Refer to the following table for tightening torque.
Airtight test/Air purge, etc.
For carrying out airtight test, air purge, gas leak check
and addition of refrigerant refer to the Installation
Manual supplied with the outdoor unit.
Open fully valves of the outdoor unit
Gas leak check
Using a leak detector or soapy water, check for gas
leaks at the connecting pipe work and the caps on the
service valves.
REQUIREMENT
Use a leak detector designed specifically for HFC
refrigerant (R410A, R134a, etc.).
Heat insulating process
Fit heat insulation to the gas and liquid pipes
separately.
During cooling mode, the temperature of the liquid and
the gas pipes are reduced. Therefore ensure sufficient
insulation is fitted to prevent dew condensation.
• On the gas side ensure that the heat insulation used
is heat resistant to a minimum temperature of 120°C
• Using the supplied heat insulation. Insulate the
interconnecting parts of the indoor unit, ensuring that
there is no exposure of any refrigerant pipe work.
As detailed in the illustration below.
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.)
5
REFRIGERANT PIPING
B
Connecting pipe
outer dia. (mm)
Ш6.4
Ш9.5
Ш12.7
Ш15.9
Tightening torque
(N•m)
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)
Re-tightening
torque (N•m)
18
(1.8 kgf•m)
42
(4.2 kgf•m)
50
(5.0 kgf•m)
68
(6.8 kgf•m)
Outer diam. of
copper pipe
6.4
9.5
12.7
15.9
R410A tool used
R410A R22
0 to 0.5 (Same as left)
0 to 0.5 (Same as left)
0 to 0.5 (Same as left)
0 to 0.5 (Same as left)
Conventional tool used
R410A R22
1.0 to 1.5 0.5 to 1.0
1.0 to 1.5 0.5 to 1.0
1.0 to 1.5 0.5 to 1.0
1.0 to 1.5 0.5 to 1.0
Outer diam. of copper pipe
6.4
9.5
12.7
15.9
R410A R22
1.5 to 2.0 1.0 to 1.5
1.5 to 2.0 1.0 to 1.5
2.0 to 2.5 1.5 to 2.0
2.0 to 2.5 1.5 to 2.0
6
ELECTRIC WORK
WARNING
1. Using the specified wires, ensure the wires are connected and securely fixed so that no
external force can transmit to the connecting part of the terminals.
Poor connection may cause risk of fire, etc.
2. Ensure connection of earth wire. (Grounding work)
Do not connect the earth wire to a gas pipe, mains water pipe, lightning rod, or the earth wire of a telephone.
Incorrect earthing will cause risk of an electric shock.
3. For electrical installation work, strictly follow the Local and national Regulations of each
country and the Installation Manual. A designated power supply must be used.
Capacity shortage of the power supply or incomplete installation may cause an electric shock or a fire.
CAUTION
Ensure an earth leakage breaker is installed.
Failure to install, may result in an electric shock.
REQUIREMENT
• For power supply wiring, strictly conform to the Local authorities in each country.
• For wiring of the power supply of the outdoor units, follow to the outdoor unit Installation Manual.
• Never connect 220–240V control wiring to the terminal blocks (U1, U2, A, B) fault will be. (Caused.)
• Arrange the electrical wiring so that they do not come into contact with high-temperature parts of the pipe
work; this is to prevent the risk of insulation melting and causing a possible accident.
• After connecting wires to the terminal block. Secure wiring with cable clamp.
• Store wiring install control wiring and refrigerant piping within the same line.
• Do not turn on power of the indoor unit until vacuuming of the refrigerant pipe has finished.